Determinação da polarização elétrica espontânea de cristais líquidos ferroelétricos de alta condutividade elétrica devida à presença de íons

Tromba, Antonio Carlos

doi:10.11606/D.43.2000.tde-20072021-155650

Home

Facilities

Master's Dissertation

DOI

https://doi.org/10.11606/D.43.2000.tde-20072021-155650

Document

Master's Dissertation

Author

Tromba, Antonio Carlos (Catálogo USP)

Full name

Antonio Carlos Tromba

E-mail

Institute/School/College

Instituto de Física

Knowledge Area

Solid-State Physics

Date of Defense

2000-06-30

Published

São Paulo, 2000

Supervisor

Figueiredo Neto, Antonio Martins (Catálogo USP)

Committee

Figueiredo Neto, Antonio Martins (President)
Olmedo, Hugo Alejandro Gallardo
Sartorelli, Jose Carlos

Title in Portuguese

Determinação da polarização elétrica espontânea de cristais líquidos ferroelétricos de alta condutividade elétrica devida à presença de íons

Keywords in Portuguese

CRISTAIS LÍQUIDOS
MATÉRIA CONDENSADA

Abstract in Portuguese

O comportamento da polarização elétrica espontânea em função da temperatura é estudado para duas amostras ('C IND.8''H IND.17'O e 'C IND.12'H IND.25'O) de alta condutividade. O método utilizado foi o do estudo do comportamento das diferentesharmônicas que compõem o sinal da polarização e mostrou ser um método adequado para determinação da polarização espontânea. A transição de fase ''S IND.C'POT.*'- ''S IND.A'POT.*' foi determinada estudando-se o comportamento da permissividadeelétrica complexa em função da temperatura

Title in English

Determination of the spontaneous electrical polarization of ferroelectric liquid crystals of high electrical conductivity due to the presence of ions

Keywords in English

CONDENSED MATTER
LIQUID CRYSTALS

Abstract in English

The behaviour of the spontaneous electric polarization dependence of the temperature is studied with two high conductivity samples (C8H17O and C12H25O). We studied the behaviour of the different harmonics which compose the signal of the electric polarization and showed to be an adequate method to determine the spontaneous electric polarization. The phase transition Sc*-Sa* was determined by analysing the complex electric permittivity behaviour as a function of the temperature.

WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.

2000Tromba.pdf (28.19 Mbytes)

Publishing Date

2021-08-31

Derived works

WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.

MAGALHÃES, M, et al. Tetragonal structure induced by wetting at the interface between a solid substrate and a lyotropic sponge phase [doi:10.1021/jp0353338]. Journal of Physical Chemistry B [online], 2003, vol. 107, p. 13949-13953.
MAGALHÃES, M, Neto, A.M.F., and TROMBA, A C. Bulk structure of the (inverted) sponge phase of the lyotropic mixture of sodium dodecyl sulfate, 1-pentanol, water, and cyclohexane [doi:10.1021/jp037398g]. Journal of Physical Chemistry B [online], 2004, vol. 108, p. 15962-15968.
Neto, A.M.F., et al. Bulk and wetting properties of inverted sponge phases. In 6th Ibero-American Workshop on Complex Fluids and their Applications, Lisboa, 2003. Books of Abstracts, Lisboa, CENIMAT, 2003., 2003. Abstract.
Neto, A.M.F., et al. Tetragonal structure induced by wetting at the interface between a solid substrate and a lyotropic inverse sponge phase. In 20th International Liquid Crystal Conference, Ljubljana, 2004. Programme Ljubljana: SBF, 2004., 2004. Abstract.