Preparation and Properties of Temperature and pH Sensitive Chitosan Supramolecular Gel Based on Host-guest Interaction of Cucurbit[8]uril

林友文,; 李立凡,; 李光文,

doi:10.6023/a12070428

Cited by 3 publications

(1 citation statement)

References 3 publications

(3 reference statements)

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“…Molecular gels are a type of soft matter comprised of a liquid and a gelator, the mass of which is typically less than 2000 Da . Molecular gels are promising materials for numerous potential and realized applications because their formation can lead to significant changes in mechanical, thermal, optical and, in some cases, electronic and luminescent properties of the materials . Specifically, the thermal formation of self‐assembled fibrillar networks ( SAFiN s) in some organogels that contain a luminogen has provided attractive routes for the construction of aggregation‐induced emissive (AIE) materials .…”

Section: Introductionmentioning

confidence: 99%

Mechano‐Responsive, Thermo‐Reversible, Luminescent Organogels Derived from a Long‐Chained, Naturally Occurring Fatty Acid

Zhang

Weiss

2016

Chemistry A European J

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The gelating ability of an α-diketo derivative of oleic acid, 9,10-dioxooctadecanoic acid (DODA), is investigated. DODA can gelate aromatic liquids and many other organic liquids. By contrast, none of the liquids examined can be gelated by the methyl ester of DODA. DODA is a more efficient gelator than stearic acid and the monoketo derivative due to its more extensive intermolecular dipole-dipole interactions. Formation of organogels of DODA can be induced by both thermal and mechanical stimuli, during which the luminescent and mechanical properties can be modulated significantly. The emission from DODA in 1-octanol exhibits a large, reversible, hypsochromic shift (≈25 nm) between its thermally cycled gel and sol states. The emission changes have been exploited to probe the kinetics of the aggregation and deaggregation processes. DODA is the simplest gelator of which we are aware that exhibits a reversible shift in the emission. Although the self-assembled fibrillar networks of the DODA gels in 1-octanol, benzonitrile, or silicone oil are crystalline, isothermal mechanical cycling between the gel and the sol states is rapid and can be repeated several times (i.e., they are thixotropic). The single-crystal structure of DODA indicates that extended intermolecular dipole-dipole interactions are crucial to the thermal and mechanical formation of DODA gels and the consequential changes in emissive and mechanical properties. From analyses of structural information, gelator packing, and morphology differences, we hypothesize that the mechanical destruction and reformation of the gel networks involves interconversion between the 3D networks and 1D fiber bundles. The thermal processes allow the fibrillar 3D networks and their 0D components (i.e., isolated molecules or small aggregates of DODA) to be interconverted. These results describe a facile approach to the design of mechano-responsive, thermo-reversible gels with control over their emission wavelengths.

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Section: Introductionmentioning

confidence: 99%

Mechano‐Responsive, Thermo‐Reversible, Luminescent Organogels Derived from a Long‐Chained, Naturally Occurring Fatty Acid

Zhang

Weiss

2016

Chemistry A European J

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Thermal and pH Dual Responsive Copolymer and Silver Nanoparticle Composite for Catalytic Application

et al. 2014

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and vinyl imidazole copolymer, P(NIPAM-co-VI), was synthesized by free radical emulsion polymerization. Then, the copolymer and silver nanoparticle composite, P(NIPAM-co-VI)-Ag, was prepared by in situ reduction of AgNO 3 with NaBH 4 . Due to the coexistence of thermal-responsive PNIPAM and pH-responsive PVI, P(NIPAM-co-VI) and P(NIPAM-co-VI)-Ag exhibited both thermal and pH responsibility, their size would change while altering the temperature or pH of the circumvent. Their thermal and pH dual responsive properties were studied by dynamic light scattering (DLS). P(NIPAM-co-VI)-Ag could be stably dispersed in water at a pH range from 3.0 to 9.3, which is favorable to use P(NIPAM-co-VI)-Ag as a catalyst in the reduction reaction of p-nitrophenol. The reaction rate constant (k app ) increased with the decrease of pH or the increase of VI content in the copolymer. Figure 1FT-IR spectra of P(NIPAM-co-VI)-1 and P(NIPAMco-VI)-1-Ag.

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Ferrocene-based redox-responsive polymer gels: Synthesis, structures and applications

Wang

et al. 2017

Journal of Organometallic Chemistry

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Preparation and Properties of Temperature and pH Sensitive Chitosan Supramolecular Gel Based on Host-guest Interaction of Cucurbit[8]uril

Cited by 3 publications

References 3 publications

Mechano‐Responsive, Thermo‐Reversible, Luminescent Organogels Derived from a Long‐Chained, Naturally Occurring Fatty Acid

Mechano‐Responsive, Thermo‐Reversible, Luminescent Organogels Derived from a Long‐Chained, Naturally Occurring Fatty Acid

Thermal and pH Dual Responsive Copolymer and Silver Nanoparticle Composite for Catalytic Application

Ferrocene-based redox-responsive polymer gels: Synthesis, structures and applications

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