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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of surfactant alkyl chain length on lyotropic uniaxial to biaxial cholesteric phase transitions

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Akpinar, Erol [1] ; Uygur, Nazli [1] ; Uyanik, Seda [1] ; Figueiredo Neto, Antonio Martins [2]
Total Authors: 4
[1] Abant Izzet Baysal Univ, Fac Arts & Sci, Dept Chem, TR-14030 Golkoy, Bolu - Turkey
[2] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL E; v. 42, n. 9 SEP 2019.
Web of Science Citations: 0

Some ionic surfactant-based lyotropic mixtures, exhibiting cholesteric phases, were prepared to investigate the effect of the surfactant alkyl chain length on a) uniaxial-to-biaxial phase transitions and b) stabilization of different cholesteric phases. Potassium alkanoates, KCx, (potassium undecanoate, KC11, potassium dodecanoate, KC12, and potassium tridecanoate, KC13) were chosen as the surfactant molecules. The lyotropic mixtures, which were composed of KCx/potassium sulfate (K2SO4)/decanol (DeOH)/water/brucine, where brucine is a chiral dopant molecule, were studied. Partial phase diagrams were constructed to show how the surfactant alkyl chain affects the phase topologies in the phase diagrams. It was observed that the presence of a longer surfactant alkyl chain in the mixture favors the stabilization of the larger discotic cholesteric, Ch(D), and cholesteric biaxial, Ch(B), phase domains. The phase transitions from the uniaxial cholesteric to biaxial cholesteric phase were shifted to lower temperatures. (AU)

FAPESP's process: 16/24531-3 - Structural and biophysics properties of native and modified lipoproteins
Grantee:Antonio Martins Figueiredo Neto
Support type: Research Projects - Thematic Grants
FAPESP's process: 14/50983-3 - INCT 2014: complex fluids
Grantee:Antonio Martins Figueiredo Neto
Support type: Research Projects - Thematic Grants