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pH-Responsive microgel dispersions for repairing damaged load-bearing soft tissue

Squeezing a single polypeptide through a nanopore

Interfacial structure and stability of food emulsions as affected by protein–polysaccharide interactions

Microscopy, microstructure and displacement of proteins from interfaces: implications for food quality and digestion

Supramolecular routes towards liquid crystalline side-chain polymers

Light-induced self-assembly of nanofibers inside liposomes

Nanopatterning by protein unfolding

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Electrocatalytically functional multilayer assembly of sulfite oxidase and cytochrome c

Replica molding of high-aspect-ratio (sub-)micron hydrogel pillar arrays and their stability in air and solvents

pH-Responsive branched polymer nanoparticles

The influence of protic non-solvents present in the environment on structure formation of poly(γ-benzyl-l-glutamate) in organic solvents

Tuning the properties of PS–PIAT block copolymers and their assembly into polymersomes

Strain induced clustering in polyelectrolyte hydrogels

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Effect of substrate adhesion and hydrophobicity on hydrogel friction

Atomic force microscopy and theoretical investigation of the lifted-up conformation of polydiacetylene on a graphite substrate

Electric-field-induced displacement of charged spherical colloids in compressible hydrogels

Controlling cell morphology on amino acid-modified cellulose

Alternating polymer vesicles

The preferential deposition of silica micro-particles at the boundary of inkjet printed droplets

Direct observation of adhesion and spreading of emulsion droplets at solid surfaces

Self-assembled organogels obtained by adding minute concentrations of a bile salt to AOT reverse micelles

Structure-directed self-assembly of alkyl-aryl-ethylene oxide amphiphiles

Collective headgroup conformational transition in twisted micellar superstructures

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Self-assembled organogels obtained by adding minute concentrations of a bile salt to AOT reverse micelles

Content Provider	Royal Society of Chemistry (RSC)
Author	Huang, Yi-En Tung, Shih-Huang Raghavan, Srinivasa R.
Copyright Year	2008
Abstract	The two-tailed anionic surfactant, AOT is well-known to form spherical reverse micelles in organic solvents such as cyclohexane and n-alkanes. Here, we report that trace amounts (e.g., around 1 mM) of the dihydroxy bile salt, sodium deoxycholate (SDC) can transform these dilute micellar solutions into self-supporting, transparent organogels. Gels can be obtained at a total AOT + SDC concentration as low as 6 mM or about 2 mg mL−1. Among all the bile salts studied, SDC is the only one that is capable of inducing organogels. The structure and rheology of these organogels is reminiscent of the self-assembled networks formed by proteins such as actin in water. In particular, both classes of gels exhibit the remarkable property of strain-stiffening, where the gel stiffness (modulus) increases with strain amplitude. Structurally, both gels are based on entangled networks of long, cylindrical filaments. We propose that SDC forms hydrogen bonds with AOT headgroups, transforming some of the spherical AOT micelles into semiflexible filaments. The average diameter of these filaments has been measured by small-angle neutron scattering (SANS), and suggests that SDC molecules are stacked together in the filament core.
Starting Page	1086
Ending Page	1093
Page Count	8
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	4
Issue Number	5
Journal	Soft Matter
DOI	10.1039/b718145k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Rheology Neutron diffraction Micelle Surfactant Deoxycholic acid Young's modulus Actin Bile acid Cyclohexane Alkane Micellar solutions Organogels Hydrogen bond
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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Self-assembled organogels obtained by adding minute concentrations of a bile salt to AOT reverse micelles

Bile salt assisted morphological changes of cationic gemini surfactant (12-4-12) micelles

Spectroscopic characterization of cytochrome c entrapped in aot reverse micelles.

Binding constant of amines to water/aot/n-hexene reverse micelles. Influence of the chemical structure (2000).

A new reverse wormlike micellar system: Mixtures of bile salt and lecithin in organic liquids (2006)

Interactions of Colipase with Bile Salt Micelles. 1. Ultracentrifugation Studies

Equilibrium Study on Interactions between Proteins and Bile-Salt Micelles by Micellar Electrokinetic Chromatography

Structural evolution in catanionic mixtures of cetylpyridinium chloride and sodium deoxycholate

Comparison between aqueous and nonaqueous aot-heptane reverse micelles using acridine orange as molecular probe.

Self-assembled organogels obtained by adding minute concentrations of a bile salt to AOT reverse micelles

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Spectroscopic characterization of cytochrome c entrapped in aot reverse micelles.

Binding constant of amines to water/aot/n-hexene reverse micelles. Influence of the chemical structure (2000).

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Self-assembled organogels obtained by adding minute concentrations of a bile salt to AOT reverse micelles