Citation: CAI Long-Cheng, WANG Yi-Jie, LI Juan, HUANG Jian-Bin. Investigation of the Mechanism of Temperature-Responsiveness of Metal-Cholate Supramolecular Hydrogels[J]. Acta Physico-Chimica Sinica, ;2012, 28(10): 2298-2304. doi: 10.3866/PKU.WHXB201209112 shu

Investigation of the Mechanism of Temperature-Responsiveness of Metal-Cholate Supramolecular Hydrogels

1.
1 College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046;
2 Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China

Received Date: 13 August 2012
Available Online: 11 September 2012
Fund Project: 新疆大学天山学者计划(03.064.12) (03.064.12)国家自然科学基金(21073006)资助项目 (21073006)

Temperature-promoted hydrogel formation was investigated in a mixed solution of sodium cholate and metal ions. Transmission electron microscopy (TEM) was used to characterize the morphology of the microstructures of the hydrogels, and nanofibers were observed. The arrangement of the cholate and metal ions was proposed according to the X-ray diffraction (XRD) measurements. Rheological measurements revealed that the strength of the hydrogels increases with increasing temperature, while the fluorescence of the gels increased as well. Increasing the temperature also increased the gel formation rate. The critical micelle concentration of sodium cholate solution decreased slightly with increasing temperature. On the basis of the experimental results, we propose that the increased hydrophobicity of cholate ions with increasing temperature leads to stronger hydrogen bonding between cholate ions, which accounts for the unique heating-enhanced gelation behavior.
- Hydrogel,
- Sodium cholate,
- Temperature-sensitivity,
- Fluorescence,
- Rheological behavior
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