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以制备三维有序大孔(3DOM)La0.8Sr0.2MnO3和La0.7Ca0.2Sr0.1MnO3钙钛矿材料为例,研究3DOM钙钛矿热致变色材料的制备方法.采用自组装方法将粒径约为220nm的聚苯乙烯(PS)微球组装成三维有序排列的胶体晶体模板,以La(NO3)3·6H2O,Ca(NO3)2·4H2O,Sr(NO3)2,Mn(CH3COO)2·4H2O、乙醇等配制的混合金属硝酸盐溶液为前驱填充于PS胶晶模板间隙中,经干燥和煅烧除去微球模板后得到三维有序大孔(3DOM)La0.8Sr0.2MnO3和La0.7Ca0.2Sr0.1MnO3材料.结果表明,由于填充次数不同,得到3DOM材料的骨架厚度不同,其孔径收缩率也相差较大.同时,由于制备方法不同,3DOM和块体La0.8Sr0.2MnO3材料的居里温度也相差较大.
Taking 3DOM La0.8Sr0.2MnO3 and La0.7Ca0.2Sr0.1MnO3 perovskite materials as example, the preparation method of 3DOM perovskite thermochromic material was studied.The particle size (PS) microspheres with a size of about 220 nm were assembled into three-dimensionally ordered colloidal crystal templates. La (NO3) 3.6H2O, Ca (NO3) 2.4H2O, Sr (NO3) 2, Mn (CH3COO) 2.4H2O, ethanol and other prepared mixed metal nitrate solution was pre-filled in the PS plastic template gap, after drying and calcination to remove the microspheres template obtained three-dimensional ordered macropores (3DOM) La0.8Sr0.2MnO3 and La0. 7Ca0.2Sr0.1MnO3 material.The results show that 3DOM material has different skeleton thickness and different pore shrinkage due to different filling times.At the same time, due to the different preparation methods, 3DOM and La0.8Sr0.2MnO3 Curie temperature is also a big difference.