By Yujun Feng, Zonglin Chu, Cécile A. Dreiss
This short offers an updated assessment of clever surfactants and describes a vast spectrum of triggers that set off the formation of wormlike micelles or reversibly music the morphology of surfactant aggregates from wormlike micelles to a different kingdom, or vice versa. Combining the fields of chemistry, physics, polymer technological know-how, and nanotechnology, its fundamental concentration is at the layout, formula, and processing of clever viscoelastic surfactant recommendations, protecting the clinical ideas governing responsiveness to at least one or extra specific triggers, all the way down to the end-use-driven capabilities. the 1st bankruptcy explains why and the way surfactants self-assemble into viscoelastic wormlike micellar suggestions akin to polymer recommendations, whereas the next chapters express how the reaction to a given set off interprets into macroscopic rheological adjustments, together with temperature, gentle, pH, CO2, redox, hydrocarbon, and so on. The final bankruptcy demonstrates the functions of those viscoelastic assemblies in oil and fuel construction, drag relief, biomaterials, cleansing procedures, electrorheological and photorheological fluids. reviews and views are supplied on the finish to finish this Brief.
This short is aimed toward chemists, physicists, chemical engineers and nano-scientists who're thinking about self-assemblies and functions of surfactants, in addition to graduates in actual chemistry.
Yujun Feng, Ph.D., is a professor on the kingdom Key Laboratory of Polymer fabrics Engineering, Polymer examine Institute of Sichuan college, Chengdu, Sichuan Province, P. R. China.
Zonglin Chu, Ph.D., is a post-doctoral fellow operating on the actual Chemistry Institute, college of Zürich, Switzerland.
Cécile A. Dreiss, Ph.D., is a senior lecturer on the Institute of Pharmaceutical technology, King’s collage London, UK.
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Additional info for Smart Wormlike Micelles: Design, Characteristics and Applications (SpringerBriefs in Molecular Science)
A thermo-thickening response was detected for concentrations ranging from 7 to 15 wt%; the viscosity peak and corresponding temperature could be tuned by varying surfactant concentration . e. a hybrid fluorocarbon/hydrocarbon double chain, with six carbon atoms in the fluorocarbon chain and four carbon atoms in the hydrocarbon chain [5, 6, 55]. Cryo-TEM measurements  were later undertaken, in combination with rheology, digital light microscopy, and self-diffusion NMR. Cryo-TEM revealed a heatinduced micellar transition from mainly short rodlike micelles at 20 °C to very large multilamellar vesicles at temperatures at 30 and 40 °C, and to a disordered lamellar phase at 50 °C and above .
The authors further developed systems with photo-switchable viscosity by introducing coumarin derivatives into the aqueous solutions of Triton X-100 and CTAB . They found that coumarins generally increased the viscosity, but the extent of the increase was specific: alkyl chains of medium length showed the largest effect. In situ photo-dimerization of the coumarins led to a further rise in the viscosity for short alkyl substituents, but to a drop in the viscosity for long alkyl substituents.
Trickett K, Eastoe J (2008) Surfactant-based gels. Raghavan SR (2009) Distinct character of surfactant gels: a smooth progression from micelles to fibrillar networks. Kavanagh GM, Ross-Murphy SB (1998) Rheological characterisation of polymer gels. Prog Polym Sci 23:533–562 Chapter 3 Light-responsive Wormlike Micelles Abstract UV/Vis light as a trigger displays a set of advantages over other types of stimuli in terms of its “clean” character, low cost, and precise spatial localization, and for these reasons it has been widely exploited in the development of smart materials.