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Citation: FENG Tao, LI Dian-Qing, D. G. Evans, DUAN Xue. On the Factors Influencing the Crystal Structure and Crystalline Size of Layered Double Hydroxides[J]. Chinese Journal of Applied Chemistry, ;2003, 20(2): 117-120. shu

On the Factors Influencing the Crystal Structure and Crystalline Size of Layered Double Hydroxides

1.
Ministry of Education, Key Laboratory of Science and Technology of Controllable Chemical Reaction, Beijing University of Chemical Technology, Beijing 100029

Corresponding author: DUAN Xue,
Received Date: 16 July 2002
Available Online: 17 October 2002
Fund Project: 国家高技术发展研究(863)计划(2001AA327120) (863)计划(2001AA327120)

Mg-Al layered double hydroxides(LDH) have been synthesized from Mg(NO₃)₂·6H₂O, Al(NO₃)₃·9H₂O, NaOH and Na₂CO₃ in a rotating liquid-film reactor. It is found that the aging temperature, degree of supersaturation in the course of aging and degree of supersaturation in the course of nucleation are the important factors affecting the crystal structures and crystallite sizes of hydrotalcites. Lower aging temperatures and addition of water during the aging process favour the formation of nano-sized hydrotalcites. When the concentration of Mg²⁺ is between 0.1~1.6 mol/L the particle size of LDH increases with increase of the Mg²⁺ concentration.
- layered double hydroxides,
- rotating liquid-film reactor,
- particle size
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