Structural and Rheological Studies on Growth of Salt-Free Wormlike Micelles Formed by Star-Type Trimeric Surfactants

Langmuir ◽  
2012 ◽  
Vol 28 (49) ◽  
pp. 16798-16806 ◽  
Author(s):  
Takumi Kusano ◽  
Hiroki Iwase ◽  
Tomokazu Yoshimura ◽  
Mitsuhiro Shibayama
Keyword(s):  
Wormlike Micelles ◽  
Trimeric Surfactants

Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

2018 ◽  
Author(s):  
Elaine A. Kelly ◽  
Judith E. Houston ◽  
Rachel Evans
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Wormlike Micelles ◽  
Tetraethylene Glycol ◽  
Light Illumination ◽  
First Time ◽  
Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such as<i></i>drug delivery and micellar catalysis. Currently, their behaviour in the equilibrium <i>cis-</i>and <i>trans</i>-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>) using small-angle neutron scattering (SANS). We show that the incorporation of <i>in-situ</i>UV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>could switch between wormlike micelles (<i>trans</i>native state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked <i>in</i><i>-situ</i>through combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

Nonaqueous Photorheological Fluids Based on Light-Responsive Reverse Wormlike Micelles

Langmuir ◽  
2010 ◽  
Vol 26 (8) ◽  
pp. 5405-5411 ◽  
Author(s):  
Rakesh Kumar ◽  
Aimee M. Ketner ◽  
Srinivasa R. Raghavan
Keyword(s):  
Wormlike Micelles ◽  
Photorheological Fluids

Treatment of Malignant Brain Tumor by Tumor-Triggered Programmed Wormlike Micelles with Precise Targeting and Deep Penetration

2016 ◽  
Vol 26 (23) ◽  
pp. 4201-4212 ◽  
Author(s):  
Lijuan Zeng ◽  
Lili Zou ◽  
Haijun Yu ◽  
Xinyu He ◽  
Haiqiang Cao ◽  
...  
Keyword(s):  
Brain Tumor ◽  
Malignant Brain Tumor ◽  
Wormlike Micelles ◽  
Deep Penetration
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