| 用动态光散射跟踪钙-海藻酸水溶液凝胶化 |
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| 引用本文： | 鲁路,刘新星,曾钫,童真.用动态光散射跟踪钙-海藻酸水溶液凝胶化[J].高分子学报,2007,0(3):297-300. |
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| 作者姓名： | 鲁路 刘新星 曾钫 童真 |
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| 作者单位： | 1. 暨南大学理工学院
2. 华南理工大学材料科学研究所,广州,510640 |
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| 摘 要： | 海藻酸(alginate)是一种天然多糖,是直链键合的β-D-甘露糖醛酸(M)和α-L-古洛糖醛酸(G)的无规嵌段共聚物1].在海藻酸水溶液中加入钙、铜、锌、铅等二价正离子,能够形成凝胶;其中钙-海藻酸凝胶在细胞输送、组织工程等领域受到人们的关注2,3].影响海藻酸凝胶化的因素包括海藻酸的分子量和分子量分布、M/G值和序列分布、溶液浓度、正离子种类与浓度等4,5].
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| 关 键 词： | 海藻酸 凝胶化 凝胶化点 临界指数 动态光散射 |
| 收稿时间： | 2006-06-05 |
| 修稿时间： | 2006-07-13 |
DYNAMIC LIGHT SCATTERING STUDIES OF SOL-GEL TRANSITION IN AQUEOUS ALGINATE SOLUTION INDUCED BY CALCIUM CATIONS |
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| LU Lu,LIU Xinxing,ZENG Fang,TONG Zhen.DYNAMIC LIGHT SCATTERING STUDIES OF SOL-GEL TRANSITION IN AQUEOUS ALGINATE SOLUTION INDUCED BY CALCIUM CATIONS[J].Acta Polymerica Sinica,2007,0(3):297-300. |
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| Authors: | LU Lu LIU Xinxing ZENG Fang TONG Zhen |
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| Institution: | Research Institute of Materials Science,South China University of Technology,Guangzhou 510640 |
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| Abstract: | The sol-gel transition of aqueous alginate solutions induced by calcium cations has been studied by using dynamic light scattering.A critical relaxation was observed near the gel point,which was characterized by the power law of the time-intensity correlation function g~((2))(t)-1∝t~(-μ).The comparison of this critical exponent μ with the critical exponent n for mechanical relaxation obtained with dynamic rheology measurements shows μ=2n for the Ca-alginate sol-gel transition.The critical exponent μ was found to be proportional to q~2,q is the scattering vector,and the proportional coefficient almost equaled to the correlation length of the critical gel. |
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| Keywords: | Alginate Gelation Gel point Critical exponent Dynamic light scattering |
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