کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1530158 | 1511989 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation of ultrafine magnetite and its oxygen adsorption
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
Ultrafine magnetite was prepared in aqueous solution by reflux method with ethylenediamine as precipitant. On partial substitution of ethylenediamine for distilled water in the solution, the crystallite was reduced in size linearly. Ethylenediamine worked as not only a precipitant but also a inhibitor for crystal growth. Substituting ethyleneglycol for distilled water at the constant concentration of ethylenediamine, the crystallite was steeply reduced in size to around 2Â nm. Specific surface area reached to around 340Â m2/g. Such decrease of the crystallite size probably results from increase of viscosity of the solution. High viscosity of the solvent poses to decrease diffusion of iron cations to magnetite nuclei. The adsorption isotherms of O2 and N2 were measured at 298Â K using each gas and mixed gas with ratio of 2:8. Under the existence of both the gases, the obtained magnetite adsorbed only O2 with maximum amount of about 1.5Â mass%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 173, Issues 1â3, 15 October 2010, Pages 84-88
Journal: Materials Science and Engineering: B - Volume 173, Issues 1â3, 15 October 2010, Pages 84-88
نویسندگان
Takahiro Takei, Qiang Dong, Yoshinori Yonesaki, Nobuhiro Kumada, Nobukazu Kinomura,