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On the coexistence of uniaxial nematic phases in the lyotropic mixture sodium dodecyl sulphate/1-decanol/D2O

Texto completo
Autor(es):
Oliveira-Filho, A. G. [1] ; Akpinar, E. [2] ; Reis, D. [1] ; Figueiredo Neto, A. M. [1]
Número total de Autores: 4
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[2] Abant Izzet Baysal Univ, Arts & Sci Fac, Dept Chem, Golkoy, Bolu - Turkey
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: MOLECULAR CRYSTALS AND LIQUID CRYSTALS; v. 657, n. 1, p. 1-5, 2017.
Citações Web of Science: 0
Resumo

Previously examined lyotropicmixtures sodium dodecyl sulphate (SDS) 1-decanol (DeOH) - D2O were prepared in four different molar ratios, M = {[}D2O]/{[}SDS], where M = 30, 31, 32 and 33, to study the coexistence of uniaxial discotic (N D) and calamitic (N C) nematic phases as was claimed in recent articles. Those mixtures were investigated in a specific temperature range by laser conoscopy, polarized optical microscopy (POM) and small-angle X-ray scattering (SAXS) to construct partial phase diagram. By combining the results obtained from all these techniques, we could not observe the N-D - N-C phase coexistence in the phase diagram of SDS/DeOH/D2O after the detailed investigation, as it was formerly reported. The results obtained in this study are in a good agreement with symmetry arguments and theoretical predictions but not with literature claims. The present results are also consistent with experimental investigations of other lyotropic mixtures whose phase diagrams were previously identified. (AU)

Processo FAPESP: 11/13616-4 - Propriedades ópticas e estruturais de elastômeros e fluidos complexos de interesse biológico
Beneficiário:Antonio Martins Figueiredo Neto
Linha de fomento: Auxílio à Pesquisa - Temático
Processo FAPESP: 14/50983-3 - INCT 2014: fluidos complexos
Beneficiário:Antonio Martins Figueiredo Neto
Linha de fomento: Auxílio à Pesquisa - Temático