کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1295527 1498402 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Protonic mobility in acidic colloids
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Protonic mobility in acidic colloids
چکیده انگلیسی
Colloidal monoclinic zirconia ZrO2 particles have been synthesized by hydrothermal treatment from acetate solutions. To increase their surface acidity, they have been treated by aqueous solutions of phosphoric acid, sulfophenylphosphonic acid (SPPA, (HO)2(O)-C6H6-SO3H) and sulfodifluoromethylphosphonic acid (SFPA, (HO)2(O)P-CF2-SO3H). This leads to the covalent bonding of phosphoric or sulfonic acid groups onto the surface of the particles. Solid state NMR (31P, 1H) studies show the covalent grafting of the phosphate and phosphonates groups and qualitatively illustrate the fast proton dynamics of these surface conducting materials as compared with that of crystalline α-Zr(HPO4)2. H2O. But, water adsorption is still necessary to increase the long distance proton mobility. Then, the macroscopic conductivity remains low (between 10− 4 S cm− 1 and 10− 3 S cm− 1 25 °C, RH 70%) and shows a strong hysteresis while cycling the relative humidity. The mechanism limiting the conductivity seems to be interparticle transfer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 177, Issues 26–32, 31 October 2006, Pages 2561-2564
نویسندگان
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