Liquid crystalline gel with refractive index gradient of curdlan
Liquid crystalline gel with refractive index gradient of curdlan
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DOI：
10.1021/la035822z
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发表时间：
2004-08-03
期刊：
影响因子：
3.9
通讯作者：
Konno, A
中科院分区：
文献类型：
--
作者：
Dobashi, T;Nobe, M;Konno, A
将溶解在氢氧化钠水溶液中的可得然胶透析成氯化钙水溶液以形成凝胶。在垂直于透析管长轴的凝胶横截面中观察到的透明和浑浊同心层分别被鉴定为具有折射率梯度的液晶凝胶和无定形凝胶。每层的厚度与透析管的直径成正比，并且凝胶化与时间的根成正比。独特的图案形成归因于凝胶多糖构象的变化和钙诱导的交联导致的钙阳离子和氢氧根阴离子通过透析管的扩散。结果表明，随着同心液晶层向透析管中心移动，同心液晶层曲率的增加会降低凝胶多糖分子的有序度。
Curdlan dissolved in aqueous sodium hydroxide was dialyzed to aqueous calcium chloride to form a gel. Transparent and turbid concentric layers observed in the gel cross section perpendicular to the long axis of the dialysis tube were identified as liquid crystalline gels with refractive index gradient and amorphous gels, respectively. The thickness of each layer was proportional to the diameter of the dialysis tube, and the gelation proceeded in proportion to the root of time. The unique pattern formation was attributed to the change of curdlan conformation and calcium-induced cross-linking resulting from a diffusion of calcium cations and hydroxide anions through the dialysis tube. It is suggested that the orderedness of the curdlan molecules decreases by the increase of the curvature of the concentric liquid crystal layers as the layer comes toward the center of the dialysis tube.