کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5189252 1381180 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of water in bacterial cellulose using dielectric spectroscopy and electron microscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Characterization of water in bacterial cellulose using dielectric spectroscopy and electron microscopy
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 48, Issue 26, 13 December 2007, Pages 7623-7631
نویسندگان
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