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[求助]
做Fe3O4@SiO2核殼結(jié)構(gòu),等待出現(xiàn)無定形SiO2的饅頭峰,卻等來。。。
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The as prepared nanoparticles(1 g) were dispersed in a mixture of 100 mL of ethanol and 20 mL of DOW. TEOS (2 mL) and ammonium hydroxide (2.5 mL) were added subsequently under vigorous mechanic stirring at room temperature. After keeping the stirring for 20 h, the obtained Fe3O4/SiO2 composites were washed with ethanol and water for three times and dried under vacuum overnight. Hereafter, the produced composite (1 g) and APTES (1 mL) were dispersed in 50 mL of toluene and stirred at room temperature for 24 h. 我是按照上述方法做的核殼結(jié)構(gòu),XRD圖卻如下 木蟲里面雖然也有人出現(xiàn)過如此問題,但是他們是找不到峰http://www.gaoyang168.com/bbs/viewthread.php?tid=4591762,據(jù)壇子里高手解釋是SiO2layer太薄了,但是我這里很奇怪,出現(xiàn)的峰里面除了Fe3O4,其余的峰基本能對(duì)上 ZSM-39 crystalline phase SiO2( JCPDS No.47-0720) 2θ=~12.7°,~15. 1°,23.8°,28.5°出現(xiàn)的幾個(gè)比較強(qiáng)的峰都基本能對(duì)上,如圖中黃色所示。請(qǐng)問各位這是什么原因呢?順便附上我的txt文件,望高手幫忙分析下! QQ截圖20130513094950.jpg |
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