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.

Calorimetry, Electron paramagnetic resonance

---

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.

---

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.

Polymers, Atomic force microscopy, Vibrational spectra

Similar abstracts:

• Abstracts: Raman spectroscopic measurements and ab initio molecular orbital studies of cadmium(II) hydration in aqueous solution
• Abstracts: Thermal characterization and sensor application of one-dimensional nanostructures employing microelectromechanical system
• Abstracts: Photocarrier generation in smectic phenylnaphthalene liquid crystalline photoconductor. Crystal structures and photocarrier generation of thioindigo derivatives
• Abstracts: Electrochemical charging, countercation accommodation, and spectrochemical identity of microcrystalline solid cobalt hexacyanoferrate
• Abstracts: Modeling enzyme reaction intermediates and transition states: citrate synthase. Salt effects on protein titration and binding

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.