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Multi-responsive supramolecular organogel with a crystalline-like structure.

Pengyao Xing¹, Shangyang Li, Feifei Xin

¹School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100, PR China.

Carbohydrate Research

|January 8, 2013

Summary

Researchers developed a novel organogel from beta-cyclodextrin (β-CD) and lithium chloride (LiCl). This smart material exhibits a crystalline-like structure and responds to stimuli like amines, heat, and ions.

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Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels

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Area of Science:

Supramolecular Chemistry
Materials Science
Polymer Chemistry

Background:

Organogels are crucial in materials science for their unique properties.
Cyclodextrin-based gels offer tunable characteristics for advanced applications.

Purpose of the Study:

To report the first multi-responsive cyclodextrin-based organogel with a crystalline-like structure.
To investigate the gelation mechanism and stimuli-responsive behavior of the β-CD/LiCl/DMF system.

Main Methods:

Gelation induced by ethylene diamine (EDA) in a β-cyclodextrin (β-CD) and lithium chloride (LiCl) system in N,N-dimethylformamide (DMF).
Characterization using optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR).
Investigation of responses to heating-cooling cycles and chemical stimuli (H+, Cu2+).

Main Results:

Instantaneous transformation from solution to gel upon EDA addition.
Formation of a precipitate-like gel after a heating-cooling process.
Both gels exhibit crystalline-like morphology with sheet-like layers and ordered channel-type packing.
The organogel transforms into an amorphous precipitate in response to H+ and Cu2+ ions.

Conclusions:

Ethylene diamine is the sole aliphatic amine capable of inducing gel formation in this system.
The developed organogel demonstrates multi-responsive behavior, transitioning between gel and precipitate states.
This research provides a foundation for designing novel smart materials with tunable properties.