Investigations of Current Generated in Construction of Polarization in Vectra A, Liquid Crystal Copolyester

<div>The Thermally Stimulated Polarization Current (TSPC) is used to study the dielectric behavior of Vectra A, liquid crystal copolyester. The TSPC spectra of samples of Vectra A for various polarizing fields (3.8 kV/cm- 19.2 kV/cm) have been investigated. A dipolar relaxation is observed in the low temperature region ~ 30 oC due to orientation of naphthalene groups present in Vectra A which is termed as peak-P1. In the higher temperature region above 110 oC, the dipolar and space charge peaks are in composite form. TSPC cycle is performed to distinguish the dipolar and space charge peaks. Also, the TSPC spectra of annealed and doped samples of Vectra A are studied. The results obtained from TSPC spectra are compared with TSDC spectra of samples of Vectra A. </div>

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Space charge measurement in EVA film at cryogenic through room temperature region

2001 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.01CH37225) ◽

10.1109/ceidp.2001.963589 ◽

2002 ◽

Cited By ~ 3

Author(s):

M. Nagao ◽

Y. Murakami ◽

N. Hozumi ◽

M. Fukuma

Keyword(s):

Space Charge ◽

Temperature Region ◽

Room Temperature ◽

Charge Measurement

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Multipod ZnO Nanoforms: Low Temperature Synthesis and Characterization

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2007.124 ◽

2007 ◽

Vol 7 (2) ◽

pp. 689-695 ◽

Cited By ~ 5

Author(s):

Tandra Ghoshal ◽

Soumitra Kar ◽

Subhajit Biswas ◽

Gautam Majumdar ◽

Subhadra Chaudhuri

Keyword(s):

Low Temperature ◽

Field Emission ◽

Cross Section ◽

Thermal Evaporation ◽

Synthesis And Characterization ◽

Low Temperature Synthesis ◽

Temperature Synthesis ◽

Optical Absorbance ◽

Higher Temperature ◽

Emission Studies

ZnO nanotetrapods were synthesized by a simple thermal evaporation of Zn powder at a relatively low temperature ∼600 °C. The tetrapods have four legs with hexagonal cross-section. Interpenetrating growth was observed in some of these nanotetrapods. Multipod ZnO nanoforms were produced at higher temperature. The optical characterizations such as optical absorbance, photoluminescence and Raman spectroscopy reveal excellent crystal qualities of these nanoforms. The field emission studies indicated that these nanoforms could be utilized in field emission based devices.

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Dyeing Properties of Chitosan-Sulfamic Acid Solution Treated Wool with Silane Coupling Agent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.331.377 ◽

2011 ◽

Vol 331 ◽

pp. 377-381 ◽

Cited By ~ 1

Author(s):

Xue Mei He ◽

Kong Liang Xie

Keyword(s):

Low Temperature ◽

Acid Solution ◽

Crosslinking Agent ◽

Sulfamic Acid ◽

Weak Acid ◽

Color Strength ◽

Surface Appearance ◽

Wool Fabrics ◽

Wool Fibers ◽

Higher Temperature

In this study, wool fabrics were treated with different concentration of chitosan sulfamic acid solution under using 3-glycidyloxypropyltrimethoxysilane (GPTMS) as a crosslinking agent. The structure of treated wool fabrics was investigated by SEM, DSC-TG. Treated wool fibers had a irregular surface appearance, showed the presence of amounts of Nano SiO2 and their aggregates deposited onto surface of wool fibers. The thermal properties were obviously enhanced. Treated wool fabrics is more stable in higher temperature than that of untreatment. Treated wool fabrics were dyed with weak acid red B, and dyeing behaviour were studied by means of by light reflectance measurements. The color strength (K/S value) of treated wool fabrics obviousily increased from 5.33 to 31.68 by comparison with the untreatment. As a result, it can be concluded that the chitosan sulfamic acid solution with GPTMS treatment could improve the weak acid red B low temperature dyeing on wool. Further, low temperature dyeing of wool fabrics with chitosan-sulfamic acid is safe, so the results obtained are quite promising as a basis for possible future industrial application.

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