Investigation of the interaction of alkali ions with surfactant head groups for the formation of lyotropic biaxial nematic phase via optical birefringence measurements

Erol Akpinar; Dennys Reis; Antonio Martins Figueiredo Neto

doi:10.1117/12.981979

5 March 2013 Investigation of the interaction of alkali ions with surfactant head groups for the formation of lyotropic biaxial nematic phase via optical birefringence measurements

Erol Akpinar, Dennys Reis, Antonio Martins Figueiredo Neto

Author Affiliations +

Proceedings Volume 8642, Emerging Liquid Crystal Technologies VIII; 864203 (2013) https://doi.org/10.1117/12.981979
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

Lyotropic liquid crystals exhibiting nematic phases were obtained from the mixtures potassium laurate/alkali sulfate salts (M₂SO₄)/1-undecanol (UndeOH)/water and sodium dodecyl sulfate (SDS)/M₂SO₄/1-dodecanol (DDeOH)/water, where M₂SO₄ represents the alkali sulfate salts being Li₂SO₄, Na₂SO₄, K₂SO₄, Rb₂SO₄ or Cs₂SO₄. The birefringences measurements were performed via laser conoscopy. Our results indicated that cosmotropic and chaotropic behaviors of both ions and head groups are very important to obtain lyotropic biaxial nematic phase. To obtain the biaxial nematic phase, surfactant head group and ion present in lyotropic mixture have relatively opposite behavior, e.g. one more cosmotropic (more chaotropic) other less cosmotropic (less chaotropic) or vice versa.

Citation Download Citation

Erol Akpinar, Dennys Reis, and Antonio Martins Figueiredo Neto "Investigation of the interaction of alkali ions with surfactant head groups for the formation of lyotropic biaxial nematic phase via optical birefringence measurements", Proc. SPIE 8642, Emerging Liquid Crystal Technologies VIII, 864203 (5 March 2013); https://doi.org/10.1117/12.981979

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