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Title: Unexpected role of linker position on ammonium gemini surfactant lyotropic gyroid phase stability

Journal Article · · Soft Matter
DOI:https://doi.org/10.1039/c5sm02671g· OSTI ID:1240162
 [1];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. of Wisconsin, Madison, WI (United States); Univ. of Minnesota, Minneapolis, MN (United States)
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Arising from the water-driven self-assembly of amphiphiles over generally narrow temperature and composition phase windows, aqueous lyotropic liquid crystal (LLC) network phases are useful in applications as therapeutic delivery vehicles and templates for mesoporous material syntheses. While a clear set of amphiphile design rules that enables access to these intricate three-dimensional structures has yet to emerge, recent work indicates that bis(ammonium), bis(phosphonium), and dicarboxylate gemini (“twin tail”) surfactants enable enhanced access to LLC network phases such as the double gyroid (G). In order to better understand the scope of this amphiphile design strategy, we investigated the synthesis and aqueous LLC self-assembly behaviors of a homologous series of quaternary gemini bis(ammonium) dichloride surfactants, in which we varied the position of the hydrophobic linker that connects the constituent single tail surfactants. These experiments show that the position of the linker directly impacts the maximum counterion–headgroup hydration capacity and the extent of counterion–headgroup association, all of which contribute to the aqueous lyotropic double gyroid network phase stability. Thus, judicious selection of the linker position in ionic gemini surfactants provides a new molecular design tool for manipulating LLC network phase stability.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); 3M; Paul J. Bender; USDOE
Grant/Contract Number:
CHE-9974839; CHE-1048642; AC02-06CH11357
OSTI ID:
1240162
Journal Information:
Soft Matter, Vol. 12, Issue 8; ISSN 1744-683X
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (3)

Gyroid structured aqua-sheets with sub-nanometer thickness enabling 3D fast proton relay conduction journal January 2019
Origins of low-symmetry phases in asymmetric diblock copolymer melts journal January 2018
Design of Ionic Liquid Crystals Forming Normal-Type Bicontinuous Cubic Phases with a 3D Continuous Ion Conductive Pathway journal June 2019

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