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Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Zürich | Dreiss C.A.,King's College London | Feng Y.,University of Sichuan | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Chemical Society Reviews | Year: 2013

A major scientific challenge of the past decade pertaining to the field of soft matter has been to craft 'adaptable' materials, inspired by nature, which can dynamically alter their structure and functionality on demand, in response to triggers produced by environmental changes. Amongst these, 'smart' surfactant wormlike micelles, responsive to external stimuli, are a particularly recent area of development, yet highly promising, given the versatility of the materials but simplicity of the design - relying on small amphiphilic molecules and their spontaneous self-assembly. The switching 'on' and 'off' of the micellar assembly structures has been reported using electrical, optical, thermal or pH triggers and is now envisaged for multiple stimuli. The structural changes, in turn, can induce major variations in the macroscopic characteristics, affecting properties such as viscosity and elasticity and sometimes even leading to a spontaneous and effective 'sol-gel' transition. These original smart materials based on wormlike micelles have been successfully used in the oil industry, and offer a significant potential in a wide range of other technological applications, including biomedicine, cleaning processes, drag reduction, template synthesis, to name but a few. This review will report results in this field published over the last few years, describe the potential and practical applications of stimuli-responsive wormlike micelles and point out future challenges. © 2013 The Royal Society of Chemistry.


Li B.,Tsinghua University | Cao H.,Tsinghua University | Shao J.,CAS Chengdu Institute of Organic Chemistry | Qu M.,CAS Chengdu Institute of Organic Chemistry | Warner J.H.,University of Oxford
Journal of Materials Chemistry | Year: 2011

In this paper, a Fe3O4 nanocrystals@graphene composite (FGC) was synthesized via a chemical deposition method by using graphene oxide as a precursor. We also investigate the structures, physicochemical properties and applications of FGCs, involving superparamagnetic performance, and use as supercapacitors and lithium ion battery (LIBs). The results showed that the Fe3O4 NCs were formed and incorporated onto the surface of the graphene sheets. The composite material FGC with a micrometre scale structure possessed similar size as the graphene sheets and exhibited superparamagnetic behavior at room temperature. The supercapacitance values of the FGC composites were enlarged compared with those of the graphene sheets or Fe3O4 NCs, which is attributed to the interaction between the Fe3O4 NCs and the graphene sheets. Meanwhile, a superior rechargeable stability of FGCs used as an anode material in LIBs can be observed. © The Royal Society of Chemistry 2011.


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Chemical Communications | Year: 2010

A novel pH-switchable wormlike micellar system was prepared by mixing N-erucamidopropyl-N,N-dimethylamine and maleic acid with molar ratio of 2:1. The viscosity of the micellar solution is switchable via tuning the pH through the addition of minor acid or base. Such a system possesses the characteristics of a facile, rapid, cost-effective reversible process and recyclable cheaper materials. © 2010 The Royal Society of Chemistry.


Peng J.,China West Normal University | Li X.,China West Normal University | Tang C.,China West Normal University | Bai W.,CAS Chengdu Institute of Organic Chemistry
Green Chemistry | Year: 2014

Dehydration of lactic acid was performed over various metal sulphates. BaSO4 was found to show an efficient activity for dehydration of lactic acid to acrylic acid due to the moderate acidity on its surface. Under the optimal conditions, 99.8% lactic acid conversion and 74.0% acrylic acid selectivity were achieved over the BaSO4 catalyst. © 2014 The Royal Society of Chemistry.


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Langmuir | Year: 2012

Long-chain amidosulfobetaine surfactants, 3-(N-fattyamidopropyl-N,N- dimethyl ammonium) propanesulfonates (n-DAS, n > 18), are insoluble in pure water due to their high Krafft temperature (T K), while they are soluble when inorganic salt is added to the surfactant solution as the T K of these zwitterionic surfactants is decreased. The influence of the salt content and ionic species of the added electrolytes on the T K of the series of amidosulfobetaine surfactants was examined by means of UV-vis spectrophometry and visual inspection. It was found that the T K of these surfactants depends strongly on not only the hydrophobic alkyl length (n), but also the salinity of the aqueous environment. When the salt concentration is increased from 0 to 100 mM, the T K shows a sharp decrease; when the salinity is fixed between 100 and 2000 mM, the T K varies linearly with n with a slope of ∼7.7 irrespective of the salt species and the salt content. When the salt concentration is further increased above 2000 mM, a linear function is still observed, but the slope increases slightly. © 2011 American Chemical Society.


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Soft Matter | Year: 2010

Wormlike micellar gels formed by concentrated 3-(N-erucamidopropyl-N,N- dimethyl ammonium) propanesulfonate (EDAS) solutions show both gel-like behavior and shear banding transitions. Such surfactant gels are strong viscoelastic fluids with ultra-long but finite relaxation time, instead of bulk gels with infinite zero-shear viscosity and relaxation time. We demonstrate for the first time the relationship between the yield stress and shear banding transition of the surfactant gels. © 2010 The Royal Society of Chemistry.


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
Chemical Communications | Year: 2011

A thermo-switchable surfactant gel with the property of gelation on heating was developed for the first time based on palmitylamidosulfobetaine. Micellar growth from globular aggregates to entangled worms upon heating is responsible for the thermal gelation. © 2011 The Royal Society of Chemistry.


Li B.,Tsinghua University | Cao H.,Tsinghua University | Shao J.,CAS Chengdu Institute of Organic Chemistry | Qu M.,CAS Chengdu Institute of Organic Chemistry
Chemical Communications | Year: 2011

A three dimensional composite was constructed by anchoring Fe 3O4 nanoparticles encapsulated within carbon shells onto reduced graphene oxide sheets, which exhibited enhanced anode performances in lithium ion batteries with a specific capacity of 842.7 mAh g-1 and superior recycle stability after 100 cycles. © 2011 The Royal Society of Chemistry.


Chu Z.,CAS Chengdu Institute of Organic Chemistry | Chu Z.,University of Chinese Academy of Sciences | Feng Y.,CAS Chengdu Institute of Organic Chemistry
ACS Sustainable Chemistry and Engineering | Year: 2013

There is no doubt that the surfactant and detergent industry is facing increasing severe environmental impact, and environmentally benign pathways are preferred to prepare these materials. We report herein a green route toward the preparation of vegetable-derived long-chain surfactants. The synthesis process possesses the following characteristics: bioresource-derived erucic acid (leftovers of rapeseed oil) was used as a starting material; no solvent was used and no chemical waste was produced; and high-yield products could be obtained in short reaction time. Compared with traditional surfactants bearing a saturated hydrophobic tail shorter than C18, the erucic acid-derived surfactants are more environmentally friendly because of their lower dosages in practical applications and the presence of the chemical degradable unsaturated bond and amido group in their molecular architecture. © 2012 American Chemical Society.


Liu X.-L.,CAS Chengdu Institute of Organic Chemistry | Liu X.-L.,University of Chinese Academy of Sciences | Han W.-Y.,CAS Chengdu Institute of Organic Chemistry | Han W.-Y.,University of Chinese Academy of Sciences | And 2 more authors.
Organic Letters | Year: 2013

A wide range of structurally diverse 3,3′-thiopyrrolidonyl spirooxindoles bearing three contiguous stereogenic centers can be smoothly obtained via a domino Michael/cyclization reaction between 3-isothiocyanato oxindoles and 3-methyl-4-nitro-5-alkenyl-isoxazoles with commercially available quinine as the catalyst under mild conditions. The protocol is significantly characterized by high reactivity, a low catalyst loading (1 mol %), and an excellent diastereo- and enantioselectivity (up to >99:1 dr and 98% ee). © 2013 American Chemical Society.

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