Electron paramagnetic resonance and ab initio structural studies on liquid crystalline systems
Article Abstract:
An electron paramagnetic resonance experiment was conducted using predeuterated-2,2,6,6-tetramethyl-4-piperidone-N-oxide-Tempone as a probe to study the n-hexl and n-heptyl members of the p-cyanophenyl p-(n-alkyl)benzoate (RCBz) liquid crystals. The differential scanning calorimetry measurements revealed a conformational change upon solidification of the supercooled nematic phase. The ab initio calculations using the STO-3G basis set suggested that there are three possible conformers for RCBz liquid crystals.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Layering transitions at the free surface of a smectic liquid crystal
Article Abstract:
A study was conducted to analyze the free surface of the isotopic phase of a liquid-crystal compound supporting an isotropic-smectic-A transition. Standard organic chemistry procedures were carried out to prepare the compound. A uniaxial surface layer supporting ordinary and extraordinary refractive indices was considered because the free surface induced a homeotropic alignment. Results indicated that the formation fo the first smectic layer at the surface correlated with a temperature interval of several K.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Surface studies of polymer blends by sum frequency vibrational spectroscopy, atomic force microscopy, and contact angle goniometry
Article Abstract:
A study was conducted to analyze the surface composition, structure and wetting characteristics of a polymer blend. A combination of surface-sensitive methods were utilized to carry out the analysis. The polymer blend was characterized by two thermodynamically compatible components. The Park Scientific M5 equipment was utilized to perform atomic force microscopy studies. Experimental results indicated that the structure of the polymer blend was different from the bulk.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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