金属离子/胆酸钠超分子水凝胶特殊温度响应性的机理研究

doi:10.3866/PKU.WHXB201209112

CORC > 北京大学 > 化学与分子工程学院

	金属离子/胆酸钠超分子水凝胶特殊温度响应性的机理研究; Investigation of the Mechanism of Temperature-Responsiveness of Metal-Cholate Supramolecular Hydrogels
	蔡龙成 ; 王一杰 ; 李娟 ; 黄建滨
刊名	物理化学学报
	2012
关键词	水凝胶胆酸钠温度敏感荧光性质流变性质 Hydrogel Sodium cholate Temperature-sensitivity Fluorescence Rheological behavior
DOI	10.3866/PKU.WHXB201209112
英文摘要	研究了胆酸钠溶液与金属离子溶液混合自组装而成的水凝胶随温度升高而机械强度增强的独特温度响应性.利用透射电镜(TEM)和X射线衍射(XRD)仪表征了水凝胶中聚集体的微观形貌及分子排列方式.考察了其流变学行为、荧光性质随温度的变化.结果表明,升温促进凝胶形成的速率,并提高凝胶的机械强度.随着温度的升高,稀土离子的荧光强度显著增强.表面张力测量表明,胆酸钠溶液的临界胶束浓度随温度的升高而略有降低.综合实验事实,我们提出随温度升高导致的凝胶强度增强行为是由胆酸钠分子在高温下聚集能力增强的结果.; 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.; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 2; 10; 2298-2304; 28
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/230826]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	蔡龙成,王一杰,李娟,等. 金属离子/胆酸钠超分子水凝胶特殊温度响应性的机理研究, Investigation of the Mechanism of Temperature-Responsiveness of Metal-Cholate Supramolecular Hydrogels[J]. 物理化学学报,2012.
APA	蔡龙成,王一杰,李娟,&黄建滨.(2012).金属离子/胆酸钠超分子水凝胶特殊温度响应性的机理研究.物理化学学报.
MLA	蔡龙成,et al."金属离子/胆酸钠超分子水凝胶特殊温度响应性的机理研究".物理化学学报 (2012).