کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10614579 987167 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flexible magnetic membranes based on bacterial cellulose and its evaluation as electromagnetic interference shielding material
ترجمه فارسی عنوان
غشاء مغناطیسی انعطاف پذیر بر اساس سلولز باکتریایی و ارزیابی آن به عنوان مواد حفاظتی تداخل الکترومغناطیسی
کلمات کلیدی
سلولز باکتریایی، مگنتیت و جذب موج الکترومغناطیسی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
چکیده انگلیسی
Flexible magnetic membranes with high proportion of magnetite were successfully prepared by previous impregnation of the never dried bacterial cellulose pellicles with ferric chloride followed by reduction with sodium bisulfite and alkaline treatment for magnetite precipitation. Membranes were characterized by Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), vibrating magnetometer, field emission scanning electron microscopy (FEG-SEM) and impedance spectroscopy. Microwave properties of these membranes were investigated in the X-band (8.2 to 12.4 GHz). FEG-SEM micrographs show an effective coverage of the BC nanofibers by Fe3O4 nanoparticles. Membranes with up to 75% in weight of particles have been prepared after 60 min of reaction. Magnetite nanoparticles in the form of aggregates well adhered to the BC fibers were observed by SEM. The average crystal sizes of the magnetic particles were in the range of 10 ± 1 to 13 ± 1 nm (estimated by XRD). The magnetic particles in the BC pellicles presented superparamagnetic behavior with a saturation magnetization in the range of 60 emu g− 1 and coercive force around 15 Oe. These magnetic pellicles also displayed high electrical permittivity and a potential application as microwave absorber materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: C - Volume 33, Issue 7, October 2013, Pages 3994-4001
نویسندگان
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