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	Selectivity of crystal growth direction in layered double hydroxides
	Zhao Yun ; Liang Ji ; Li Feng ; Duan Xue
	2010-05-10 ; 2010-05-10
关键词	Experimental/ ageing aluminium compounds crystal growth from solution crystallites magnesium compounds particle size precipitation (physical chemistry)/ crystal growth direction selectivity Mg-Al layered double hydroxides coprecipitation method aging temperature aging time Mg-Al molar ratio crystal structure particle size crystallite sizes Mg(OH)/sub 2/-Al(OH)/sub 3// A8110D Crystal growth from solution A6150C Physics of crystal growth/ MgOHAlOH/ss Al/ss Mg/ss OH/ss H/ss O/ss
中文摘要	Investigation of selectivity of crystal growth direction in layered double hydroxides is helpful to control their particle sizes in different directions. Mg-Al layered double hydroxides (LDHs) were synthesized using a coprecipitation method. The influences of aging temperature, aging time, and Mg/Al molar ratio on the crystal structure, the LDHs particle size, and the selectivity of crystal growth in different directions were investigated. The results show that the size of the crystallites in the a direction is larger than that in the c direction for all experimental conditions, indicating faster crystal growth in the a direction than in the c direction. The crystallite sizes in the a and c directions both increase with decreasing Mg/Al molar ratio but with less difference between the sizes in the two directions. Therefore, the crystal growth rate in the c direction increases more than that in the a direction as the Mg/Al molar ratio decreases. The influence of the aging time, aging temperature, and Mg/Al molar ratio on the selectivity of the crystal growth direction can be used to prepare LDHs with selected sizes in the a and c directions.
语种	英语 ; 英语
出版者	Editorial Board of J. of Tsinghua University ; China
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/23756]
专题	清华大学
推荐引用方式 GB/T 7714	Zhao Yun,Liang Ji,Li Feng,et al. Selectivity of crystal growth direction in layered double hydroxides[J],2010, 2010.
APA	Zhao Yun,Liang Ji,Li Feng,&Duan Xue.(2010).Selectivity of crystal growth direction in layered double hydroxides..
MLA	Zhao Yun,et al."Selectivity of crystal growth direction in layered double hydroxides".(2010).

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