NDLI: Role of kosmotrope-chaotrope interactions at micelle surfaces on the stabilization of lyotropic nematic phases

Content Provider	Springer Nature Link
Author	Akpinar, Erol Turkmen, Meric Canioz, Cihan Martins Figueiredo Neto, Antônio
Copyright Year	2016
Abstract	Three lyotropic quaternary systems of ionic surfactants were prepared to investigate the role of kosmotrope-chaotrope interactions at the micelle surfaces on stabilizing the different nematic phases. The ionic surfactants were potassium laurate (KL), sodium dodecylsulfate (SDS) and tetradecyltrimethylammonium bromide (TDTMABr), where KL is a kosmotrope surfactant, and others are chaotrope. The first system consisted of KL/decanol (DeOH)/water/alkali sulfate and the second of SDS/DeOH/water/alkali sulfate. The third system was prepared by adding sodium salts of chaotropic or kosmotropic anions to the primary mixture of TDTMABr/DeOH/water, separately. The characteristic textures of discotic nematic (N D), biaxial nematic (N B) and calamitic nematic (N C) phases were identified under polarizing light microscope. Laser conoscopy was employed to determine the uniaxial-to-biaxial phase transitions. The kosmotrope-kosmotrope or chaotrope-chaotrope interactions between the head groups of the surfactants and the ions of the electrolytes led to the stabilization of the N D phase. On the other hand, kosmotrope-chaotrope interactions stabilize the N B and/or N C phases.
Starting Page	1
Ending Page	16
Page Count	16
File Format	PDF
ISSN	12928941
Journal	The European Physical Journal E
Volume Number	39
Issue Number	11
e-ISSN	1292895X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-11-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soft Matter: Liquid crystals Soft and Granular Matter, Complex Fluids and Microfluidics Biological and Medical Physics, Biophysics Surfaces and Interfaces, Thin Films Nanotechnology Polymer Sciences Complex Systems
Content Type	Text
Resource Type	Article
Subject	Chemistry Medicine Biophysics Materials Science Surfaces and Interfaces Biotechnology

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