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Master's Dissertation
DOI
10.11606/D.43.1990.tde-16052014-113345
Document
Author
Full name
Paulo Ricardo Garcia Fernandes
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1990
Supervisor
Committee
Figueiredo Neto, Antonio Martins (President)
Tourinho, Francisco Augusto
Vanin, Jose Atilio
Title in Portuguese
Birrefringência induzida por movimento de matéria em mesofases liotrópicas na fase isotrópica
Keywords in Portuguese
Birrefringência induzida
Cristal líquido liotrópico
Fase isotrópica
Movimento de matéria
Abstract in Portuguese
Com uma mistura de laurato de potássio, decanol e agua, determina-se a birrefringência induzida, na fase isotrópica, por gradientes de velocidade, no interior da amostra. Os movimentos são provocados através de vibrações periódicas nas paredes do porta amostras. O tempo de relaxação, da estrutura de rolos, e determinado experimental e teoricamente. É determinado, também, o parâmetro T AST (temperatura em torno da temperatura de transição), ate então desconhecido, em cristais líquidos liotrópicos. Como uma provável aplicação pratica, e proposta a confecção de dispositivos sensíveis a vibrações.
Title in English
Induced birefringence by movement of matter in lyotropic mesophases in the isotropic phase.
Keywords in English
Induced birefringence
isotropic phase
lyotropic liquid crystal
movement of matter
Abstract in English
With a mixture of the Potassium Laurate, Decanol and water, the birefringence induced by gradient of the velocity, in the isotropic phase, is determinated. The movement are provocated through periodic vibrations of the superface of the sample holder. The relaxation time of the roll structure is determinated experimental an theorically. The temperature T* (temperature around the transition temperature), well-known in thermotropic liquid crystals, is determinated in liotropic liquid crystals. The confection of the sensible vibration dispositive is proposed.
 
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42270Fernandes.pdf (5.90 Mbytes)
Publishing Date
2014-05-20
 
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  • FERNANDES, P. R. G., and Neto, A.M.F. Flow Birefringence In Lyotropic Mistures In The Isotropic Phase [doi:10.1103/PhysRevE.51.567]. PHYSICAL REVIEW E (STATISTICAL PHYSICS, PLASMAS, FLUIDS AND RELATED INTERDISCIPLINARY TOPICS) [online], 1995, vol. 51, p. 567-570.
  • FERNANDES, P. R. G., and Neto, A.M.F. Flow-induced birefringence in a lyotropic liquid crystal in the isotropic phase: An order diffusion approach [doi:10.1103/PhysRevE.56.6185]. Physical Review E [online], 1997, vol. 56, p. 6185-6188.
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