噴霧熱解在LaAlO3 奈米粉體上之製備應用

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Title:	噴霧熱解在LaAlO3 奈米粉體上之製備應用
Other Titles:	Application of the spray pyrolysis on preparing laalo3 nanoparticles
Authors:	王順賢;Wang, Shuen-shian
Contributors:	淡江大學化學工程與材料工程學系碩士班余宣賦;Yu, Hsuan-fu
Keywords:	噴霧熱解;氣膠;檸檬酸;奈米粉體;LaAlO3;spray pyrolysis;aerosol;citrate acid;nano-sized particles;Lanthanum aluminate
Date:	2008
Issue Date:	2010-01-11 05:40:28 (UTC+8)
Abstract:	利用噴霧熱解程序製備結晶的LaAlO3奈米粉體。以檸檬酸作為鏊合劑加入以化學計量比所配製而成的硝酸欄和硝酸鋁的水溶液中形成LaAlO3。將所獲得的溶液藉由氨水或硝酸調整至中性的水溶液。此中性水溶液經由雙流體式霧化器形成氣膠，所形成的氣膠導入管狀反應爐進行溶劑蒸發以及固體鹽類的分解，所形成的固體粉體使用靜電粒子收集器來收集。將處理過後的粉末藉由熱分析儀、紅外線光譜儀、X光繞射分析儀、掃瞄式電子顯微鏡及場發式電子顯微鏡等來探討粉末之特性。經程序後所直接收集到的粉體屬於非結晶形態的中空球形粉粒體，粉體粒徑尺寸為數個微米。粉體經煆燒熱處理700℃透過研磨可獲得結晶的奈米級LaAlO3粉體。 Crystalline LaAlO3 nanoparticles were prepared using a spray pyrolysis process. Citric acid, as a chelating agent, was added into the aqueous solution containing the stoichiometric amount of lanthanum nitrate and aluminum nitrate to form LaAlO3. The obtained solution was then adjusted to neutral condition using NH4OH and/or HNO3. The neutral aqueous solution was transform to solution aerosols by a two-fluid type atomizer. The formed aerosols were introduced to the reaction tube and after solvent evaporation and solid salt decomposion, the resultant solid particles were collected using an electrostatic precipitator. The as-formed particles and the post-treated particles were characterized using thermogravimetric analysis, thermal differential analysis, infrared spectroscopy, x-ray diffractomtry, scanning electron microscopy, and transmission electron microscopy. The particles directly collected on the end of the process were noncrystalline hollow spherical particles with particle sizes in several micrometers. After heating the as-formed particles at 700℃ and grinding the calcined particles, crystalline LaAlO3 nanoparticles were obtained.
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Thesis

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