regional chemistry seminar 2011, biratnagar, nepal

RCS-2011 ABSTRACT VOLUME 1

The organizing committee of the Regional Chemistry Seminar

acknowledges support of

All the participants of this seminar

Manmohan Memorial Polytechnic, Hattimuda, Morang

Mahendra Morang Adarsh Multiple Campus, Biratnagar

Nepal Chemical Society

Central Department of Chemistry, Tribhuvan University, Kirtipur,

Kathmandu

Research Laboratory Department of Chemistry

Mahendra Morang Adarsh Multiple Campus, Biratnagar

Nepal


Contents

1. Preface 6

2. Committee 11

3. Key Lectures 13 PL1 Origin of Life on Earth: Role of Polymers 14

Bijan Das, Department of Chemistry, North Bengal University,

Darjeeling 734 013, India

PL2 Analysis with homemade ion selective electrodes 15

Raja Ram Pradhananga, Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu

PL3 Chemical Additives for Lubricating Oil 16 Pranab Ghosh, Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Dt. Darjeeling, West Bengal, India – 734013

PL4 The Galvanized Coatings on Steel: Present and Future 17 Amar Prasad Yadav, Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

4. Oral Presentations 18

O1 Solution Behaviour of Polyelectrolytes in Mixed Solvent Media 19 Ranjit De

1 & Bijan Das, Department of Chemistry, North

Bengal University, Darjeeling 734 013, India

O2 Concentration Dependence of Thermodynamic Properties of NaPb Liquid Alloy 20 B.P. Singh1 , I.S. Jha2 and D. Adhikari1 1Univ. Dept. of Physics, T. M. Bhag. University, Bhagalpur, Bihar, India,

2Dept. of Physics, M.M.A.M. Campus (Tribhuvan

University), Biratnagar, Nepal

O3 Limonoids from the stem bark of Cedrela tonduzii 21


Prabodh Satyal and William N. Setzer, Department of Chemistry, University of Alabama in Huntsville, 35899, Alabama, U.S.A.

O4 Effect of KCl on micellization of Cetyl Trimethyl Ammonium Bromide (CTAB) and Dodecyl Trimethyl Ammonium Bromide (DTAB) in methanol water mixed solvent media at 308.15 K by Conductometric method 22 Sujit K. Shah, Ajaya Bhattarai, Sujeet Kumar Chatterjee, Department of Chemistry Mahendra Morang Adarsh Multiple Campus, Biratnagar.

O5 The Effects of Concentration, Temperature and Solvent Composition on the Partial Molar Volumes of Sodium Dodecyl Sulphate in Methanol –Water mixed Solvent Media 23 Ajaya Bhattarai, Tarun Kumar Deo, Tulasi Prasad Niraula, and Sujeet Kumar Chatterjee, Department of Chemistry, M. M. A. M. Campus, Tribhuvan University, Biratnagar, Nepal.

5. Poster Presentations 24

P1 Preparation and characterization of epoxidised and acrylated styrene-isoprene- styrene (SIS) triblock block copolymer based nanocomposite 25 Alina shakya1, Santosh Khanal1 , Goerg H. Michler2 , Boulos Youssef3 , Jean M. Saiter3 , Rameshwar Adhikari1, 1Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

2 Institute of Physics, Martin Luther

University Halle-Wittenberg, D – 06099 Halle/Saale, Germany 3Laboratory, LECAP, Institut des Materiaux de Rouen, Universite de Rouen, Saint Etienne du Rouvray Cedex, France

P2 Study of some physical properties of polystyrene dissolved in chlorobenzene at various concentration and temperature 26 B.P.Chaudhary1 and S.Regmi, 1Manmohan Memorial Polytechnic, Hattimuda, Morang Central Department of Physics, Tribhuvan University, Kirtipur, Nepal


P3 Nature of Ternary complex and Effects of Time on Absorbance 27

Bimal Kumar Kanth, Department of Chemistry, Mahendra Morang Adarsh Multiple Campus, Biratnagar, Nepal

P4 Stability of the amalgams of alkali metals 28 S. K. Chakrabarti,Dept. of Physics, M. M. A. M. Campus, Biratnagar Tribhuvan University, Nepal

P5 Triterpenois from Schleichera oleosa with antimicrobial activity 29 Amitava Mandal,

1 Prasanta Chakraborty,

1 Md. Golam Rasul,

1

Madhumita Chakaborty,2 Aniruddha Saha

2 and Pranab

Ghosh1 ,

1Natural Product and Polymer Chemistry Laboatory,

Department of Chemistry, University of North Bengal, Darjeeling, India 734 013.2Department of Botany, University of North Bengal, Darjeeling, India 734 013.

P6 Polyacrylate – LC blend as a potential lube oil additive 30 Koushik Dey, Mahua Upadhyay and Pranab Ghosh Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Darjeeling-734013, India

P7 Flexible Conducting Films from Nanostructured Block Copolymer 32

Shankar Khatiwada1, Goerg H. Michler2, Jean M. Saiter3, Rameshwar Adhikari1, 1Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal 2Institute of Physics, Martin Luther University Halle-Wittenberg, D – 06099 Halle/Saale, Germany, 3Laboratory, LECAP, Institut des Materiaux de Rouen, Universite de Rouen, Saint Etienne du Rouvray Cedex, France


P8 A Conductometric study of Sodium Dodecyl Sulphate (SDS) in different composition of methanol-water mixed solvent media at 308.15 K, 318.15 K and 323.15 K 34 Tulasi Prasad Niraula, Sujit K. Shah, Ajaya Bhattarai, Sujeet Kumar Chatterjee, Department of Chemistry, Mahendra Morang Adarsh Multiple Campus, Biratnagar

6. List of Participants 35


1. Preface

Message from the President of Nepal Chemical Society

It is a matter of pleasure for Nepal Chemical Society to organize a Regional Chemistry Seminar in Biratnagar in collaboration with Mahendra Morang Adarsh Multiple Campus, Tribhuvan University and Manmohan Memorial Polytechnic, Hattimuda, Morang. Recently NCS had organized a national workshop on scientific writing in Kathmandu. In fact most of the activities of NCS are confined to Kathmandu valley and the present conference is deviation from the past since this regional conference is going to take place in eastern region of Nepal. Fortunately, this event is taking place in the International Year of Chemistry announced by International Union of Pure and Applied Chemistry (IUPAC). This Regional Chemistry Seminar is possible because of active role and commitments of teachers and other communities of eastern region of Nepal specially that of Mahendra Morang Campus. NCS would like to thank all who willingly helped to organize this seminar. We hope that such co-operation will continue in future so that NCS need not have to confine its activities to Kathmandu.

Nepal Chemical Society (NCS), established in 1979 is a national voluntary non-profit association of all the chemistry professionals of Nepal. At present, it has over 1000 members from different universities, colleges, research institutions, chemical industries and government organizations.

The society is dedicated to contribute for the overall progress and prosperity of the nation by promoting the research activities and capabilities as well as the quality of chemical education of the country. The NCS is equally devoted to strengthen the ties among chemists and chemical technologists working in different academic and research institutions, industries and government bodies to enhance their overall well-being.


We are pleased to announce that NSC is going to organize the

International Conference on Advanced Materials and

Nanotechnology for Sustainable Development” in Kathmandu, Nepal

on October 21-23, 2011. The objective of this conference is to

capitalize on the rapidly growing field of advanced materials and

nanotechnology, bringing together expertise from across the

international and national academic communities, as well as industry.

The remarkable evolution of nanotechnology has only been possible

because of close collaborations between chemists, materials and

biological scientists as well as industrialists. This conference aims to

bring together such diverse specialists, and to understand the

requirements of materials science and nanotechnology research for

sustainable development in an emerging country like Nepal. For

details of this conference please visit www.ncs.org.np.

I invite all to participate in the conference.

http://www.ncs.org.np/


Message from the Local Organizing Committee

In the eastern part of Nepal, Mahendra Morang Adarsh Multiple

Campus, Biratnagar has played a vital role in the production of highly

skilled manpowers. Recently, Master’s program in Chemistry and

Physics was started in Mahendra Morang Adarsh Multiple Campus.

Biratnagar being an industrial area, we need to develop collaboration

with industries and concerned departments to help the research

activities. For this purpose, Department of Chemistry, Mahendra

Morang Adarsh Multiple Campus, has established a research lab. in

the campus and started the Ph.D. programme to flourish research

activities. Mahendra Morang Adarsh Multiple campus successfully

organized the Eastern Regional Chemical Symposium on May 14-15,

2010.

In addition, it is desirable to have discussion among fellow chemists

from other part of the country. The Symposium and other seminar

activities are very essential for the scientists to enhance their

knowledge in the research activities in the national and international

fields. These types of programme will be beneficial for the young

chemists in the eastern part of Nepal to update their knowledge in the

research developments and science education. Right now, in the

department of Chemistry, two Ph.D research scholars, Sujit Kumar

Shah and Tulasi Prasad Niraula, are working under the supervision of

Prof. Dr. Sujeet Kumar Chatterjee and Mr. Ajaya Bhattarai as co-

supervisor in the field of surfactants.

The surfactant is widely used in the food processing, to stabilize emulsions and suspensions, and to improve the texture of the food products and also to remove oily stains and residues. As such the compound is found in high concentrations in industrial products including engine degreasers, floor cleaners, and car wash soaps. In household products, it is used in lower concentration with toothpastes, shampoos, and shaving cream. It is an important component in bubble bath formulations for its thickening effect and its ability to create lather. The research group of Department of Chemistry is also focusing to do the research work on the interaction

http://en.wikipedia.org/wiki/Toothpaste

http://en.wikipedia.org/wiki/Shampoo

http://en.wikipedia.org/wiki/Shaving_foam

http://en.wikipedia.org/wiki/Bubble_bath

http://en.wikipedia.org/wiki/Foam


of cationic and anionic surfactant in mixed solvent media. Besides that three M.Sc. 2nd year students are working on M.Sc. dissertation work. We are also interested to do research work on Polymer Chemistry and Natural Products Chemistry in the near future. Manmohan Memorial Polytechnic is the first polytechnic of its kind established with the generous assistance of the Government of India as a result of an agreement among the Government of India, Government of Nepal and Manmohan Memorial Foundation that aims to cater employable skills to its students which is most essential for employability and further to help develop the nation. It is affiliated to Council for Technical Education and Vocational Training (CTEVT) the umbrella organization formulated for the development of CTEVT in Nepal. MMP is an autonomous institute empowered to provide sound technical skills based on the practical knowledge to prepare the students to meet the challenges of the fast changing world. Today's need of our country is to provide with such an education and training to the upcoming generation that could foster with creativity in the cross section of lives. MMP promises for continuous striving to fulfil the need of the society by offering programs that provides life skills to the youths of the nation to become self-dependent. The target population for Diploma courses being offered by the Polytechnic is all the youths from Nepal who has successfully completed their SLC and met the requirement for entry into Diploma Courses recommended by CTEVT. The MMP will also make a provision of scholarship for a minimum of 10% poorest students in each Diploma Course. The minimum requirements for admission in diploma courses and selection procedure of the students will be the same as prescribed by CTEVT. The Diploma courses are in Mechanical Engineering, Electronics engineering and electrical engineering. These courses take 3 years to complete. There is also short term courses offered by the polytechnic will be the disadvantaged group of people. They will be brought into technical workforce at the basic and middle levels work in the industries all over the country. Most of them will be the school leavers, unemployed job seekers, and underemployed workers in the industries, women and people working in the informal sector of the society.


Available facilities • Well established world class infrastructure

• Hostel facility for 180 boys and 60 girls

• Staff quarters for 49 staff

• Guests house for guests

• Well established conference Hall and learning centers,

workshops, laboratories, library, indoor and outdoor

games, first aid service and excellent physical facilities

required for a polytechnic.

MMP is located in Hattimuda, a beautiful suburb at a distance of 10

kilometers north to Biratnagar city. A motorable road towards the east

from Manmohan Chowk – Nimuwa, leads to the Polytechnic along the

bank of Biratnagar branch of Morang- Sunsari canal.

The physical environment out here is also pleasant and pollution-free

which facilitates the teaching-learning process.

The Organizing Committee wishes all the participants a pleasant stay in

Manmohan Memorial Polytechnic, Hattimuda, Morang and a

rewarding interdisciplinary scientific exchange.


2. Committee

President : Prof. Dr. Raja Ram Pradhananga Phone: 4270455, Mobile: 9841702620 Vice President : Dr. Deba Bahadur Khadka Phone: 5545470, Mobile: 9841689702 General Secretary : Dr. Ashok Kumar Singh Phone: 5546267, Mobile: 9841744880 Secretary : Mr. Babi Kumar Kafle Mobile: 9841216001, Treasure : Dr. Susan Joshi Phone: 4890242, Mobile: 9841363224

Chief Editor : Dr. Amar Prasad Yadav Phone: 4271161, Mobile: 9841281227Members: Dr. Akkal Dev Mishra Phone: 061-540414,Mobile: 9846027853 Mr.Deval Prasad Bhattarai Mobile: 9841485151 Mr. Pawan Kumar Mishra Phone: 4623071, Mobile: 9841267929 Mr. Santosh Khanal Phone: 4037937,Mobile: 9841484090 Mr. Trilochan Pokhrel Phone: 4771424, Mobile: 984173208

Nepal Chemical Society Executive Council


Coordinator : Prof. Dr. S. K. Chatterjee Mobile: 9842059697 Members: Mr. Chandreshwar Yadav Mobile: 9842825859 Mr. Prem Kumar Shrestha Mobile: 9842626006 Mr. Tulasi Pd. Niraula Mobile: 9842050465 Mr. Narendra K. Chaudhary Mobile: 9842020096 Mr. Balaram Pant Mobile: 9852048949

Mrs. Sabita Gautam Dahal Mobile: 9842023517 Mr. Rajesh Karki Mobile: 9842050332 Mr. Ajaya Bhattarai Mobile: 9842077434 Mr. Sujit Kumar Shah Mobile: 9842033826 Mr. Monaj Khanal Mobile: 9842040034 Mr.Ratna B. Thapa Mobile: 9842631733

Local Organizing Committee


3. Key Lectures


Origin of Life on Earth: Role of Polymers

Bijan Das

Department of Chemistry, North Bengal University, Darjeeling 734 013, India

Email: [email protected]

The question “How did life on earth originate?” has been one of the most compelling quandaries for as long as man has been able to frame enquiries. Indeed all known cultures, past and present, primitive and sophisticated, have some sort of a creation myth that rationalizes how life arose. Only in the modern era, however, has it been possible to consider the origin of life in terms of a scientific framework, that is in a manner subject to experimental verification.

Radioactive dating studies indicate that the earth formed some 4.5 billion years ago. Yet the earliest known fossil evidence of life, which was generated by organisms resembling modern bacteria, is approx. 3.6 billion years old, although there is evidence for biological carbon fixation as early 3.8 billion years ago.

It is now generally accepted that the development of life occupied three stages

1. Chemical evolution, in which simple geologically occurring molecules reacted to form complex organic polymers.

2. The self-organization of collections of these polymers to form replicating entities. At some point in this process, the transition from a lifeless collection of reacting molecules to a living system occurred.

3. Biological evolution to ultimately form the complex web of modern life.

The lecture will attempt to provide a brief account of the journey from the lifeless particles that existed on prebiotic earth to the first living entity and the important roles of polymer molecules in the origin of life.


Analysis with homemade ion selective electrodes

Raja Ram Pradhananga

Central Department of Chemistry, Tribhuvan University, Kirtipur,

Kathmandu

E-mail: [email protected]

All solid state ion selective electrodes (ISEs) based on silver sulphide

can be fabricated in the laboratory from the readily available

material in a common chemistry laboratory. Such electrode can be

used for education and research in analysis with ion selective

electrodes. The use of home made ion selective electrodes in the

determination of solubility product of sparingly soluble salts;

hydrogen sulphide in cigarette smoke, fluoride in tea infusion will

be presented. The characterization of the home made ISEs and

comparison of its performance with commercial electrodes will be

discussed. Due to extravagant cost of commercial ISE, it is rather

difficult to provide commercial ISE to educational institutes of third

world countries. The low cost and ease of fabrication of present

electrode opens an opportunity to learn and use analysis with ISEs

even by the students of under developed countries. The success of

use of home made ISEs for teaching analysis with ion selective

electrode in regular practical class in the Central Department of

Chemistry will be presented. This success has opened the possibility

of introducing analysis with ISE even to the students of higher

secondary level. This will certainly have a positive impact on

education on electro-analytical technique.

mailto:[email protected]


Chemical Additives for lubricating oil

Pranab Ghosh

Natural Product and Polymer Chemistry Laboratory, Department of Chemistry, University of North Bengal, Dt. Darjeeling, West Bengal,

India - 734013

With the remarkable evolution of motors and other similar equipments, one cannot underestimate the role of lubricating oil. They prolong the useful life of machines, achieve greater performance and provide fuel economy. These lubricants are in constant evolution as they must adapt to new requirements and demands such as less frequent oil changes, higher motor performance, more drastic operating condition and the most needed fuel efficiency. All these can be achieved by the use of chemical additives, like extreme pressure (EP), viscosity modifiers (VMs), pour point depressants (PPDs), antioxidants, detergents, dispersants etc, they add performances to the lubricating oil and made them more compatible to the new technology. In order to keep pace with the development of the technology producing advanced models of engine, challenges are knocking the door of chemical laboratory to produce fuel / engine oil as specified by the OEM. Most of them are demanding higher fuel efficiency and green specification. In this context development of additive chemistry is very much essential to compete the challenges. A brief of the recent development of additive chemistry will be presented in the conference lecture.


The Galvanized Coatings on Steel: Present and Future

Amar Prasad Yadav

Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

Email:[email protected]

Galvanized steels with Zn and Zn-Al alloy coatings are extensively

used in industry for their low cost and superior corrosion resistance

in atmospheric corrosion environment. Zinc and aluminum protect

steels through original barrier layer action of the coating, secondary

barrier action of corrosion products layer, and galvanic action of

coating layer with the exposed parts of underlying steel. Aluminum

coating provides better protection than zinc coating since

aluminum itself carrying protective oxide is attacked very slowly.

However, under certain mild conditions the attack on aluminum is

too slow to provide cathodic protection to steel and in such

circumstances zinc coating is preferred1. However, there has been

growing recognition that world’s estimated amount of zinc reserve

is limited2. It points to a need for new alternative surface coating

for future applications. Any new coatings should have some

characteristic properties with regard to requirement for galvanic

anode, and industrial processing. Al, Mg and Si combined together

offer a good candidate. The reasons are the relatively abundant

amount of Al, Mg and Si compared to Zn and high oxidation

potential of Mg. In this talk, prospect of a ternary Al-Mg-Si alloy as

an alternative to conventional zinc coating will be discussed.

[1] J.C. Zoccola, H.E. Townsend, A.R. Borzillo and J.B. Horton,

ASTM STP 646(1978) 165.

[2] U.S. Geological Survey, Mineral Commodity Summaries (2009)


4. Oral Presentations


Solution Behaviour of Polyelectrolytes in Mixed

Solvent Media

Ranjit De1 & Bijan Das*

Department of Chemistry, North Bengal University, Darjeeling 734 013, India

*Corresponding author. Email: [email protected]. Email: [email protected]

Physical properties of polyelectrolyte solutions have been studied

for more than 60 years, but several of them have not yet found a

satisfactory theoretical explanation. In many cases a qualitative

understanding is available but a quantitative explanation is still

awaiting. In view of the fact that polyelectrolytes find a widening

field of applications based on their specific properties this situation

is far from satisfactory. The study of the polyelectrolyte solutions

has been conducted much more extensively in aqueous solutions

than in mixed solvent media. However, polyelectrolyte solutions

can be studied from a more general point of view in mixed solvent

media because electrostatic interactions between the polyions and

the counterions and the related properties can be modulated

simply by altering the composition of the solvent medium since this

leads to a changed value of the relative permittivity of the medium.

We have undertaken a comprehensive program to investigate the

solution behaviour of various polyelectrolytes in different mixed

solvent media and have been successful in describing the behaviour

of polyelectrolytes quantitatively in some cases. This lecture would

provide a brief account of these investigations and the main results

obtained therefrom.



Concentration Dependence of Thermodynamic

Properties of NaPb Liquid Alloy

B.P. Singh1 , I.S. Jha

2 and D. Adhikari

1*

1 Univ. Dept. of Physics, T. M. Bhag. University, Bhagalpur, Bihar,

India 2

Dept. of Physics, M.M.A.M. Campus (Tribhuvan University), Biratnagar, Nepal

Corresponding author: Email Address: [email protected]

The alloying behaviour of NaPb alloy in molten state at 700 K has

been studied on the basis of regular associated solution model. We

have computed concentration dependent thermodynamic functions

of NaPb alloys for the analysis. The analysis suggests that this alloy

is of a strongly interacting nature. The theoretical analysis reveals

that the pairwise interaction energies between the species depend

considerably on temperature. The asymmetry in thermodynamic

properties of NaPb alloys has been well explained by the present

analysis.


Limonoids from the stem bark of Cedrela tonduzii

Prabodh Satyal, William N. Setzer

Department of Chemistry, University of Alabama in Huntsville, 35899, Alabama, U.S.A. Email: [email protected]

Aceteone bark extract of Cedrela tonduzii (Meliacea) was collected from Monte Verde Costa Rica. Five limonoids were isolated from the stem bark of Cedrela tonduzii by using large flash column chromatography and High Performance Liquid Chromatography (HPLC) method and their structure was elucidated by Nuclear Magnetic Resonance (NMR), Mass Spectroscopy (MS), Infrared Spectroscopy (IR) and Ultraviolet (UV) spectroscopic techniques. The limonoids were nomilin/ obacunol derivatives, mexicanolides, sweimahonin, and 7-deacetoxy-7-oxogedunin. Antifeedant activities of isolated compounds were also tested by a conventional leaf disk method against the third-instar larvae of Spodoptera littoralis. Sweimahonin was the most active, nomilin/obacunol derivatives were weakly active, mexicanolides are moderately active and 7 deacetoxy-7-oxogedunin was inactive at the same concentration of the isolated compounds.


Study the effect of KCl on micellization of Cetyl Trimethyl Ammonium Bromide (CTAB) and Dodecyl Trimethyl Ammonium Bromide (DTAB) in methanol water mixed solvent media at 308.15 K by Conductometric Study Sujit Kumar Shah, Ajaya Bhattarai, Sujeet Kumar Chatterjee

Department of Chemistry, Mahendra Morang Adarsh Multiple

Campus, Biratnagar.

Precise measurement of specific conductivity of Cetyl Trimethyl Ammonium Bromide (CTAB) and Dodecyl Trimethyl Ammonium Bromide (DTAB) in presence and absence of Potassium Chloride (KCl) in 0.1 and 0.2 volume fractions of methanol-water are reported at 308.15 K. Critical Micelle Concentration (CMC) of the surfactants are compared. CMC increases with increase in the volume fraction of methanol in water. However, CMC are found to decrease with the adding of salt to the surfactant solution and on increasing the concentration of KCl the values of CMC found to increase. Increase in CMC with increase in volume fractions of methanol is explained in terms of cosolvent effect and decrease in CMC after adding KCl is explained on the basis of the shielding effect of salt ions to the ionic head of surfactants and thus reducing the ionic repulsion.


The Effects of Concentration, Temperature and Solvent Composition on the Partial Molar Volumes of Sodium Dodecyl Sulphate in Methanol –Water mixed Solvent Media Ajaya Bhattarai, Tarun Kumar Deo, Tulasi Prasad Niraula, and Sujeet Kumar Chatterjee

Department of Chemistry, M. M. A. M. Campus, Tribhuvan University, Biratnagar, Nepal. e-mail: [email protected]

Precise measurements on the density of sodium dodecyl sulphate in pure water and in methanol(1) + water (2) mixed solvent media containing 0.10, 0.20, 0.30 and 0.40 volume fractions of methanol at 298.15, 308.15, 318.15 and 323.15 K are reported. The

concentrations are varied from 0.3 10-1 to 1.0 10-1 mol.l-1. The results showed almost constant on the partial molar volumes with increasing surfactant concentration. Also, the partial molar volumes are found to increase with increasing temperature over the entire concentration range investigated in a given mixed solvent medium and are found to decrease with increasing methanol content in the solvent composition.



5. Poster Presentations


Preparation and characterization of epoxidised and

acrylated styrene-isoprene- styrene (SIS) triblock block

copolymer based nanocomposite

Alina shakya1, Santosh Khanal

1 , Goerg H. Michler

2 , Boulos Youssef

3

, Jean M. Saiter3 , Rameshwar Adhikari

1,*

1Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal

* Corresponding author P. O. Box. 24411, Kathmandu, Nepal, E mail: [email protected]

2Institute of Physics, Martin Luther University Halle-Wittenberg, D – 06099 Halle/Saale, Germany

3Laboratory, LECAP, Institut des Materiaux de Rouen, Universite de

Rouen, Saint Etienne du Rouvray Cedex, France

Styrene-Isoprene-Styrene (SIS) triblock copolymers belong to the

class of thermoplastic elastomers whose structures are

characterized by microphase-separation of the constituent chains.

The SIS copolymers behave as cross-linked rubbers at ambient

temperatures while are processable as thermoplastics at elevated

temperatures. In this work, a commercially available SIS triblock

copolymer was modified into epoxidised styrene-Isoprene-Styrene

(ESIS) block copolymer with performic acid generated in situ from

hydrogen peroxide and formic acid using polyethylene glycol (PEG)

as phase transfer catalyst at 600C for the improvement of

mechanical and functional properties. The epoxidised samples were

further acrylated and nanocomposites were prepared using

Boehmite nanoparticles as filler by solution casting method. The

polymers were characterized by different techniques such as

Fourier Transform Infrared (FTIR) Spectroscopy, transmission

electron microscopy (TEM), polarizing optical microscopy and

microhardness measurements.



Study of some physical properties of polystyrene

dissolved in chlorobenzene at various concentration

and temperature

B.P.Chaudhary1 and S.Regmi,

1Manmohan Memorial Polytechnic, Hattimuda, Morang Central Department of Physics, Tribhuvan University, Kirtipur, Nepal Measurement of density, refractive index, coefficient of viscosity and ultrasonic velocity in mixed solvent of polystyrene /chlorobenzene has been carried out at different temperature

(20C to 40C) with steps of 5C and concentration (0 – 2 g/10ml). The related parameters of these quantities are also calculated to discuss the nature of molecular interaction in the binary mixture. From this study it is found that the parameter changes their values continuously indicating that no structural change has taken place in this type of mixture.


Nature of Ternary complex and Effects of Time on

Absorbance

Bimal Kumar Kanth

Department of Chemistry, Mahendra Morang Adarsh Multiple

Campus, Biratnagar, Nepal

In preliminary experiments, absorption spectra of mixture

containing 2

2UO and BPGR in the proportions 1:1, 1:2, 1:3, 1:4

and 2:1 and different amounts of CTAB (ranging from a 0.5 to a 100-

fold excess of CTAB with respect to 2

2UO ) were recorded. A

comparison of these spectra revealed that only one ternary

complex is formed. The mixtures attained maximum absorbance

with 10 minutes of mixing the reactants and it remained constant

for 12 hours.

Several mixtures containing 2

2UO , BPGR and CTAB in the ratios of

1:1:20, 1:2:20, 1:3:20, 1:4:20 and 2:1:20 were prepared and their

absorbances were measured at suitable wavelength intervals. The

absorbance value corresponding to the different mixtures and

various wavelengths have been plotted.


Stability of the amalgams of alkali metals

S. K. Chakrabarti

Dept. of Physics, M. M. A. M. Campus, Biratnagar Tribhuvan University, Nepal

E-mail : [email protected]

An alloy can be made of two metals with different compositions of them. But at which composition it will be most stable, that is really a matter of interest. In the present theoretical work we have considered the amalgams of two alkali metals e.g. Na-Hg and K-Hg. Mercury is the only liquid metal at normal temperature. It is generally reluctant to mix up with other due to high cohesive force between its molecules. However, it dissolves many metals at their molten state in order to form the amalgams of them. On the other hand, alkali metals are highly reactive. In a binary alloy they usually form complexes. Due to formation of such complexes the thermodynamic properties of the amalgams of alkali metals often show anomaly—deviating considerably from that of the ideal alloys. Here we have started with the expression for the free energy of mixing (GM) according to Flory's model. The present alloys being strongly interactive systems we have modified the formula accordingly. Our main task becomes the determination of the interchange energy between the constituent elements of each amalgam. For this purpose the experimental values of GM for different concentrations have been considered. Thereafter the concentration fluctuations in the long-wavelength limit [Scc(0)] has been computed as a function of concentration of the alkali metal within the concerned amalgam. Finally the graphical method has been employed to ascertain the stoichiometric composition. Our results corroborate well the experimental findings as to the most stable composition for the said amalgams.



Triterpenois from Schleichera oleosa with antimicrobial activity Amitava Mandal,1 Prasanta Chakraborty,1 Md. Golam Rasul,1 Madhumita Chakaborty,

2 Aniruddha Saha

2 and Pranab Ghosh

*1

1Natural Product and Polymer Chemistry Laboratory,

Department of Chemistry, University of North Bengal, Darjeeling, India 734 013.

2Department of Botany, University of North Bengal, Darjeeling,

India 734 013. *Corresponding Author: E-mail address:- [email protected]

Darjeeling foothills are full of plants used as folklore medicines by the local people. Schleichera oleosa, commonly known as Ceylon Oak belongs to the family sapindaceae occurs natutrally from the foothiils of Darjeeling and used in traditional medicine for several indications from the time immemorial. It is generally used as analgesic, antibiotic and against dysentery. The oil obtained from its seed, called Kosum oil or Macassar oil is traditionally used for the cure of itch, acne, burns, other skin trouble, rheumatism (external massage), hair dressing and promoting hair growth. Therefore, Oak is a plant of major importance. In an ongoing search of bioactive compounds from medicinal plants we took a project to isolate the triterpenoids from Oak and further studied the antimicrobial activity of the isolated compounds. The results are interesting and will be presented in the poster session of the conference.

References

1. Chohan, Z. H.; Sheazi, S. K. A. Synth. React. Inorg. Met. Org.Chem., 1983. 29,

105. 2. Palanuvej, C.; Vipunngeun, N. J. Health Res., 2008, 22, 203. 3. Ghosh, P.; Mandal, A.; Chakraborty, P.; Rasul, G. M.; Chakaborty,

M.; Saha, A. Ind. J. Pharm. Sci., 2010, 72 (4), 504. 4. Ghosh, P.; Mandal, A.; Chakraborty, M.; Saha, A. J. Chem.

Pharm. Sci., 2010, 2 (4), 714.



Polyacrylate – LC blend as a potential lube oil additive

Koushik Dey, Mahua Upadhyay and Pranab Ghosh*

Natural Product and Polymer Chemistry Laboratory Department of Chemistry, University of North Bengal, Darjeeling-

734013, India *Corresponding Author: E-mail address:- [email protected]

Base fluids mineral oil generally cannot satisfy the requirements of high performance lubricants without using the benefit of modern additive technology and the development of modern engine and transmission technologies would be impossible without lubricant additives. Additives are synthetic chemical substances that can improve the performance parameters of lubricants. Some of them impart new and useful properties to the lubricant, some enhance properties already present, while some act to reduce the rate at which undesirable changes take place in the product during its service life. Apart from the use of polymeric additives, compounds with layered structure, e.g. graphite, WS2, MoS2 are also used as performance additives. Thus, because of their specific morphological feature it is also anticipated that suitable liquid crystals (LC) may also play the same role if added to the lubricating oils. Keeping this view in mind recently we have synthesized some long chain polyacrylate and have blended them with single liquid crystal of cholesteryl benzoate. Physical characterization of the polymers and the blends was carried out employing thermogravimetric analysis (TGA), IR and NMR techniques. A brief discussion on the performance of these prepared LC blended polymers in comparison to the polyacrylate itself as a pour point depressant (PPD) and viscosity index improver (VII) in lubricating oil will comprise the subject matter of our presentation in the conference.



References

1. J.Yao, Q.Wang, Z.Xu, J.Yin, S.Wen: Tribological performance of nematic liquid crystal

2. Mortier, R.M., Orszulik, S.T. (1997). Chemistry and Technology of Lubricants, Blackie Academic and Professiona, London, pp.144.

3. Beyer, C. and Jelitte, R., Lubr. Eng. 48, 450 (1992). 4. Ghosh, P., Pantar, A.V. and Sarma, A.S., Ind. J. Chem.

Tech. 5, 371 (1998).


Flexible Conducting Films from Nanostructured Block

Copolymer

Shankar Khatiwada1, Goerg H. Michler

2, Jean M. Saiter

3,

Rameshwar Adhikari1,*

1Central Department of Chemistry, Tribhuvan University, Kirtipur,

Kathmandu, Nepal

* Corresponding author: P. O. Box. 24411, Kathmandu, Nepal,

E mail: [email protected]

2Institute of Physics, Martin Luther University Halle-Wittenberg,

D – 06099 Halle/Saale, Germany

3Laboratory, LECAP, Institut des Materiaux de Rouen, Universite de Rouen, Saint Etienne du Rouvray Cedex, France

The conducting polymers have many useful applications in

electronics industries and electrical devices. This class of polymers

can be prepared in various ways. Some polymers are intrinsically

conducting while others can be made conducting by means of

blending with inorganic conducting materials or by using doping

agents. In this work, we investigate the conducting polymers

prepared on the basis of nanostructured block copolymers by

adding different amount of metal salts and by introducing ionic

groups by chemical modification of one of the blocks of the block

copolymer. First of all, the insulating polystyrene-block-

polybutadiene-block-polstyrene (SBS) triblock copolymer was

epoxidised by performic acid followed by blending with various

metal salts which leds to the formation of electron conducting

polymer films. In another set of experiments, the sulfonated

ionomer was prepared from the epoxidised SBS block copolymer



followed by means of ring opening reaction with an aqueous

solution of NaHSO3. The products were characterized by Fourier

Transform Infrared (FTIR) spectroscopy, thermogravimetric analysis

(TGA) and electron microscopy. The sulfonated ionomers having

different sulfonation degree are believed to behave as proton

conducting membranes due to the presence of SO3-H

+ group on

polymer matrix. This notion was confirmed by comparing the flow

of different ions through polyelectrolyte membrane and standard

salt bridge. The results so far obtained indicate that the increase in

the sulfonic groups content in ionomer enhances the properties of

the membrane such as proton conductivity, viscosity etc.


A Conductometric study of Sodium Dodecyl Sulphate

(SDS) in different composition of methanol-water mixed

solvent media at 308.15 K, 318.15 K and 323.15 K.

Tulasi Prasad Niraula, Sujit K Shah, Ajaya Bhattarai, Sujeet Kumar Chatterjee

Department of Chemistry Mahendra Morang Adarsh Multiple Campus, Biratnagar.

Precise measurement of specific conductivity of Sodium Dodecyl

Sulphate (SDS) in 0.1, 0.2 and 0.3 volume fractions of methanol-

water are reported at 308.15 K, 318.15 K, 323.15 K. Specific

conductivities of SDS in methanol water increase with increase in

concentration as well as methanol-water composition. Critical

Micelle Concentration (CMC) increases with increase in the volume

fraction of methanol in water. CMC are found to increase with the

increase in the temperature. Increase in CMC with increase in

volume fractions of methanol is explained in terms of breaking of

water structure due to cosolvent effect.


6. List of Participants

NAME TITLE INSTITUTION/COUNTRY

Ajaya Bhattarai Research Scholar M.M.A.M.C. , Tribhuvan University, Nepal

Akash Dev Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Alina Shakya Research Scholar Central Department of Chemistry, (T.U.), Kirtipur, Kathmandu

Amar Prasad Yadav Dr. Central Department of Chemistry, (T.U.), Kirtipur, Kathmandu

Ambika Poudel Post Graduate Student

M.M.A.M.C. , Tribhuvan University, Nepal

Amit Kumar Sarkar Lecturer M.M.A.M.C. , Tribhuvan University, Nepal

Amitava Mandal Research Scholar Natural Product Polymer Chemistry Laboratory, N.B.U., Darjeeling, India

Anil Kumar Chaudhary Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Anu Shah Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Arun Prasad Chaudhary Teaching Assistant

Purwanchal Engeenering Campus, Dharan

Ashok Kumar Das Lecturer M.M.A.M.C. , Tribhuvan University, Nepal

Ashok Kumar Yadav Teaching Assistant


Avinash Kumar Deo Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

B. P. Choudhary Lecturer Manmohan Memorial Polytechnic, Morang

Babu Ram Parajuli Post Graduate Student


Balaram Bikram Shah Post Graduate Student


Balaram Pant Teaching Assistant



Bhola Nath Luitel Post Graduate Student


Bhumiraj Tamang Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Bijan Das Prof. North Bengal University, Darjeeling, India

Bikash Kumar Mishra Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Bikram Deo Post Graduate Student


Bimal Kant Jha Assoc. Prof. Rajbiraj Multiple Campus (T.U.)

Bimal Kumar Kanth Dr. M.M.A.M.C. , Tribhuvan University, Nepal

Binita Yadav Post Graduate Student


Binod Raj K.C. Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Bishnu Chettri Teacher Gokundeshwar H.S.S, Dhankuta, Nepal

Brahma Deo Yadav Lecturer Siraha Campus (T.U.)

Chandeshwar Prasad Yadav

Assoc. Prof. Siraha Campus (T.U.)

Chandradip Kumar Yadav Teaching Assistant

Dhankuta Multiple Campus (T.U.), Nepal

Chitra Bahadur Bista Teaching Assistant

Mechi Multiple Campus (T.U.)

Chom Nath Adhikari Post Graduate Student


Damodar Phuel Instructor Education Training Centre, Sunsari

Das Bahadur Shrestha Post Graduate Student


Deepak Jyoti Basnet Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Devendra Adhikari Assoc. Prof. M.M.A.M.C. , Tribhuvan University, Nepal

Devesh Pradhan Teaching Assistant


Dil Bahadur Limbu Teaching Assistant

Hattisar Campus, Dharan


Dilip Kumar Rajbanshi Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Dilli Ram Pokharel Lecturer Damak Multiple Campus

Dinesh Kumar Mandal Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Dipak Baral Teaching Assistant


Dipak Pokharel Teaching Assistant


Dipak Sapkota Teaching Assistant


Gajendra Pandit Teaching Assistant


Ganesh Khadka Post Graduate Student


Gayatri Subedi Lecturer Birta H.S.S. , Jhapa

Ghan Shyam Yadav Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Ghanshyam Shrivastav Assoc. Prof. M.M.A.M.C. , Tribhuvan University, Nepal

Gyanendra Yadav Lecturer Dhankuta Multiple Campus (T.U.), Nepal

Hark Gurung Lecturer Sukuna Multiple Campus

Indu Mati Paudel Teaching Assistant


Indu Pudsain Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Indu Shekhar Jha Dr. M.M.A.M.C. , Tribhuvan University, Nepal

Janak Adhikari Teaching Assistant


Jay Chandra Yadav Teaching Assistant

Siraha Campus (T.U.)

Jay Narayan Mitruka Lecturer Mechi Multiple Campus (T.U.)

Jay Prakash Singh Post Graduate Student


Joshna Raut Post Graduate Student


K. B. Shahi Environmental Seam-N, Biratnagar


Monitoring Expert

Kabita Jha Post Graduate Student


Kamal Adhikari Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Kanchan Jha Post Graduate Student

Post Graduate Campus, Biratnagar

Kaushalya Sharma Lecturer Araniko H.S.S.

Koushik Dey Research Scholar Natural Product Polymer Chemistry Laboratory, N.B.U., Darjeeling, India

Krishna Bahadur Bhandari Post Graduate Student


Kuber Limbu Post Graduate Student


Kumud Kumari Choudhary Teaching Assistant


Kundan Kumar Chaudhary Post Graduate Student


Lal Kishor Yadav Teaching Assistant


Lalita Shrestha Lecturer Hattisar Campus, Dharan

Lochan Raj Neupane Engineer Manmohan Memorial Polytechnic, Morang

Malati Kumari Karn Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Manoj Khanal Teaching Assistant


Mina Kumari Aryal Lecturer Cohed College

Mohan Jee Thakur Dr. Lord Buddha College, Biratnagar

Mohan Singh Darji Post Graduate Student


Mukesh Kumar Sah Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Nabin Basnet Lecturer Damak Multiple Campus

Nabin Kumar Roy Teaching Assistant



Nagendra Lal Deo Lecturer Saraswati H.S.S., Duhabi

Namrata Dahal Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Narendra Kumar Chaudhary

Teaching Assistant


Naresh Yadav Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Netra Jang Dhangi Lecturer Purwanchal Engeenering Campus, Dharan

Netra Prasad Subedi Teaching Assistant


Nilam Kumari Chaudhary Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Niribha Yadav Assoc. Prof. M.M.A.M.C. , Tribhuvan University, Nepal

Om Prakash Gupta Lecturer Udaypur

Parthopritam Das Gupta Teaching Assistant


Piyush Sapkota Post Graduate Student


Prabodh Satyal Research Scholar Department of Chemistry, Univ. of Alabana, U.S.A.

Pramila Poudyel Post Graduate Student

Central Department of Chemistry, (T.U.), Kirtipur, Kathmandu

Pranab Ghosh Assoc. Prof. North Bengal University, Darjeeling, India

Prem Kumar Shrestha Lecturer Mechi Multiple Campus (T.U.)

Prem Narayan Sah Teaching Assistant


Priti Khatiwada Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Rabin Dahal Post Graduate Student

Central Department of Chemistry, (T.U.), Kirtipur, Kathmandu

Rabin Prasad Adhikari Post Graduate Student


Rabindra Kumar Chaudhary

Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal


Rahul Sah Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Raj Kumar Kamat Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Rajaram Pradhananga Prof. Central Department of Chemistry, (T.U.), Kirtipur, Kathmandu

Rajendra Dhakal Lecturer Damak Multiple Campus

Rajendra Prasad Yadav Teaching Assistant


Rajesh Karki Lecturer Araniko H.S.S.

Raju Dahal Post Graduate Student


Raju Dahal Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Ranjit De Research Scholar North Bengal University, Darjeeling, India

Ratna Bahadur Thapa Lecturer Damak Multiple Campus

Rita Sharma Bhandari Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Rupesh Kumar Mishra Teaching Assistant


Sabita Gautam Dahal Lecturer Manmohan Memorial Polytechnic, Morang

Sandhya Chaudhary Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Sanjay Kumar Thakur Lecturer M.M.A.M.C. , Tribhuvan University, Nepal

Sanjay Neupane Post Graduate Student


Sanjeev Sapkota Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Sanjib Chaudhary Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Santos Kumar Sah Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Santosh Kumar Sah Post Graduate Student


Santosh Shah Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal


Shankar Khatiwada Research Scholar Central Department of Chemistry, (T.U.), Kirtipur, Kathmandu

Sharmila Amatya Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Shikha Mallik Post Graduate Student


Shiv Kumar Yadav Teaching Assistant


Shiv Narayan Yadav Teaching Assistant


Shiva Kumar Rai Assoc. Prof. Post Graduate Campus (T.U.), Biratnagar

Shivaraj Koirala Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Shumi Jha Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Shyam Ghimire Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Shyam Kumari Karn Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Sitaram Gupta Assoc. Prof. M.M.A.M.C. , Tribhuvan University, Nepal

Siyanan Chaudhary Post Graduate Student


Srijana Karn Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Subash Chapagain Lecturer Mechi Multiple Campus (T.U.)

Subhangi Subedi Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Sudha Kumari Karn Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Sujeet Kumar Chatterjee Prof. M.M.A.M.C. , Tribhuvan University, Nepal

Sujit Kumar Shah Research Scholar M.M.A.M.C. , Tribhuvan University, Nepal

Sunil Prasad Yadav Lecturer Rajbiraj Multiple Campus (T.U.)

Surendra Sutihar Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal


Suresh Prasad Mahato Post Graduate Student


Suryadev Prasad Yadav Teaching Assistant

Dhankuta Multiple Campus (T.U.), Nepal

Swapan Kumar Chakrabarti Lecturer M.M.A.M.C. , Tribhuvan University, Nepal

Tara Kant Jha Lecturer Mechi Multiple Campus (T.U.)

Tarun Kumar Deo Teaching Assistant


Tekraj Dahal Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Tika Prasad Upadhyaya Lecturer Sukuna Multiple Campus

Tulasi Prasad Niraula Lecturer M.M.A.M.C. , Tribhuvan University, Nepal

William N. Setzer Prof. Department of Chemistry, Univ. of Alabana, U.S.A.

Yadu Dangal Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Yograj Podar Graduate Student M.M.A.M.C. , Tribhuvan University, Nepal

Yub Raj Sitaula Lecturer Sukuna Multiple Campus

Yuv Raj Shah Teaching Assistant


regional chemistry seminar 2011, biratnagar, nepal

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