camp meeting poster1

Structural Isomers as Reducing agents: A new approach for size Controlled Synthesis of Silver Particles for Various ApplicationsDr. Ajeet Kumar, Dr. Swati Aerry and Dr. Dan V. Goia, E-mail: goiadanv@clarkson.edu

Chemistry & Biomolecular Science, Clarkson University, Potsdam, New York, USA

90%(HQ):10% (HZ) 80%(HQ):20% (HZ) 60%(HQ):40% (HZ)

20%(HQ):80% (HZ) 10%(HQ):90% (HZ) 1%(HQ):99% (HZ)

Objective Isomers have the same number of atoms of each element in

them and the same atomic weight but differ in other properties. These difference in properties can be used to synthesize the different sizes of the particles.

Study the Effect of different structural Isomers of an organic reducing agent in controlling the size of silver particles.

Study of different process variables and the effect of the byproducts of reducing agents in conjunction with particle morphology, size and packing properties (i.e. tapped density)

Synthesized silver particles should have controlled purity, size, morphology and internal structure for the successful application various areas.

Conclusion This approach is a unique, size-controlled synthetic method for the large-

scale preparation of silver particles. The particle size is varied in a broad range (3μm to 20 nm) without

altering their uniformity and dispersity. Understanding the properties of isomers of the reducing agents and

parameters controlling the formation of metallic particles offers the capability to yield dispersed uniform silver particles with controlled morphology.

The simplicity of the process and the high concentration of metal make the described process an advantageous route to manufacture cost effectively in large scale dispersed silver particles for various applications including electronic industry.

Oxidized by product of the reducing agent plays a crucial role in controlling the final size of the particles.

byproduct actually act as a capping/ stabilizing agent

Applications

Silver ions/Complexes

Reduction

Silver Atoms

CLUSTERS

NUCLEI (8-10A˚)

Diffusional growth

NANOSIZEPRIMARY PARTICLES

LARGE MICRON SIZE PARTICLES

(1-3 MICRON) 

MICRON SIZE PARTICLES

(0.4-1.5 MICRON) 

STABLE NANOSYSTEM

(10-100 nm) 

BY PRODUCT

Formation mechanism of metallic particles in homogeneous solutions

Applications

LARGE MICRON SIZE PARTICLES (0.4-1.5 MICRON)

Applications

LARGE MICRON SIZE PARTICLES (1-3 MICRON)

Silver Plated Nylon

RFID

SOLAR PANEL

CONDUCTIVE TAPES

WATER PURIFICATION

CO

ND

UC

TIV

E P

AST

E

SILVER WINDOW

TISSUE PAPER

STABLE NANODISPERSION(10-100 nm)

INK JET PRINTING

PAINT

COINSMEDICAL

APPLICATIONS

SPORTS FABRICS COSMETICS

ELECTRONICS

Properties of Structural Isomers which can be used in controlling the size of the particles

Different isomers have different reducing strength They have different solubility in different media Different binding affinity/capping ability due to different position of the groups After being oxidized they releases different byproduct

OO

TYPE I   

TYPE II   

TYPE III   

TYPE IV   Binding Mechanism of the Oxidized byproduct of the Isomers in Controlling the Size of the Particles

We have investigated that if different structural isomers are taken then different byproducts will be formed during the reduction process and these byproducts will have different capping as well as stabilizing mechanism which can be exploited to control the final size of the particles.