Characterization of water in bacterial cellulose using dielectric spectroscopy and electron microscopy
Characterization of water in bacterial cellulose using dielectric spectroscopy and electron microscopy
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DOI：
10.1016/j.polymer.2007.10.039
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发表时间：
2007-12-13
期刊：
影响因子：
4.6
通讯作者：
Stromme, Maria
中科院分区：
文献类型：
--
作者：
Gelin, Kristina;Bodin, Aase;Stromme, Maria
它表明，只有10%的99重量%的水存在于细菌纤维素（BC）凝胶，木醋杆菌产生的，表现得像自由散装水;凝胶中的大部分水分子或多或少紧密结合到纤维素。在水相的BC凝胶中传输的离子的扩散系数的大小以及凝胶结构的冷冻断裂透射电子显微镜图像中所包含的信息表明，散装样的水被限制在“湖泊”中，而不是在整个凝胶中形成连续相。水解吸等温线表明，这些“湖”的大小随着在凝胶的生物合成过程中使用的氧气浓度的增加而减小。(C)2007爱思唯尔有限公司保留所有权利。
It is shown that only 10% of the 99 wt% water present in bacterial cellulose (BC) gels, produced by Acetobacter xylinum, behave like free bulk water; the majority of the water molecules in the gels is more or less tightly bound to the cellulose. The magnitude of the diffusion coefficients of ions transported in the water phase of the BC gels as well as the information contained in freeze fracture transmission electron microscopic images of the gel structures indicates that the bulk-like water is confined in "lakes" rather than forming a continuous phase throughout the gel. Water desorption isotherms suggest that these "lakes" decrease in size with increasing oxygen concentration used during the biosynthesis process of the gels. (C) 2007 Elsevier Ltd. All rights reserved.