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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2000.tde-20072021-155650
Document
Author
Full name
Antonio Carlos Tromba
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2000
Supervisor
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.
 
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2000Tromba.pdf (28.19 Mbytes)
Publishing Date
2021-08-31
 
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.
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