visualisation of domains in 2d molecular systems by brewster angle microscope
DESCRIPTION
VISUALISATION OF DOMAINS IN 2D MOLECULAR SYSTEMS BY BREWSTER ANGLE MICROSCOPE. J. Cir á k. CONTENTS. Langmuir monolayer at the air/water interface Self-organization of molecules in 2D system (theor y) Brewster angle microscope Maxwell displacement currents measurements. - PowerPoint PPT PresentationTRANSCRIPT
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VISUALISATION OF DOMAINS IN 2D MOLECULAR SYSTEMS
BY BREWSTER ANGLE MICROSCOPE
J. Cirák
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CONTENTS
• Langmuir monolayer at the air/water interface• Self-organization of molecules in 2D system (theory)• Brewster angle microscope• Maxwell displacement currents measurements
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Langmuir monolayersmonomolecular insoluble layers of organic amphiphilic
molecules formed at the air/water interface during the self-organized process
• Systems for the study of self-organization in 2D with the possibility to control thermodynamic state quantities
• Formation of Langmuir-Blodgett layers on solid substrates• Study of chemical reactions in 2D molecular systems• Study of phenomena in biological membranes, phase
transitions, lipid – protein interactions• Study of interactions between a receptor and a target
molecule in biosensor
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Langmuir trough
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p - A isotherm of an organic acid monolayer
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Lateral domains in Langmuir monolayers
Self-organization in binary mixture of amphiphilic molecules at the air/water interface: TSAUG p
2/14 nNEUUU Vhd p
1ln!ln
!!ln / nNkNk
nNkSSS BBnNBhd
1ln4 2/1 nTNknNEG BV p
2
2
TkE
nB
Vp number of molecules in one circular domain
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p – A isotherm of pentadecanoic acid
GLELC/LE
LC
C
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Van der Waals equation of 2D molecular system
surface pressure
Tkaaab
TkanRTA
B
B
02p
pp
20 a
baaTkB
p
p 0 [mN/m]
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p – A isotherm of pentadecanoic acid
GLELC/LE
LC
C
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Brewster angle microscopy
1 mN/m 5 mN/m
10 mN/m
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200 mm
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Experimental study of physical properties of LB films
• Nanoelectric phenomena in Langmuir monolayer
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Orientational order in the Langmuir film with Buckingham’s potential
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Change in molecular conformation
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Change in molecular orientantion
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Change in molecular charge state
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Current
Induced charge
Energy
Spatial averaged
Stat. mean value
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Comparison of calculations using various standard potentials
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The effect of cluster size
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Recordings of MDC signals obtained at three different rates of compression
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MDC signals replotted as the dependence I/b vs. area per molecule
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Conclusions
In soft material science the interest is given to the system composed of several types of molecules where the molecular interactions play a key role in determining the resultant system properties. But the interactions depend on the way how the molecules are spontaneously organized in the system – depend on self-organization. From this point of view LB films can be regarded as an ideal technological tool for modeling basic physical processes in the system with molecular organization.