喷雾干燥法制备中空偏钨酸铵球及中空结构形成机理

doi:10.13228/j.boyuan.issn1006-6543.20160128

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Abstract Nano-WO3 based materials have many properties，such as photodegradation，water splitting，electrochromism，thermochromism and photochromism，etc. Therefore，nanostructured WO3 based materials are potentially used in the fields of photocatalysis，new energy resources preparation，smart windows，sensors and flat-panel display. Hollow ammonium metatungstate spheres were synthesized by spray drying method，and the preparation process and formation mechanism of the hollow structure were analyzed. Results show that the average diameter of the hollow ammonium metatungstate ball is 1.03 μm，and the wall thickness is about 100 nm. The preparation process is divided into 3 stages： atomization，shell formation during flash evaporation and hollow structure formation. Since the initial temperature in hot air drying tower is 130 ℃，far higher than the boiling point of water，leading to rapid evaporation of droplet surface water. The fast evaporation speed leads to the droplet surface crystallization and the shell formation，thus the hollow structure forms.

Key words： WO3 ammonium metatungstate spray drying hollow sphere

Received: 03 November 2016 Published: 10 August 2017

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	ZHANG Li-Na
	SU Qi
	YANG Gao-Ling
	SHI An-Hong
	LIU Bai-Xiong

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ZHANG Li-Na,SU Qi,YANG Gao-Ling, et al. Preparation and formation mechanism of hollow ammonium metatungstate spheres by spray drying method[J]. , 2017, 27(04): 12-16.

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http://edit.chinamet.cn/Jweb_fmyjgy/EN/10.13228/j.boyuan.issn1006-6543.20160128 OR http://edit.chinamet.cn/Jweb_fmyjgy/EN/Y2017/V27/I04/12

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