| Selectivity of Crystal Growth Direction in Layered Double Hydroxides |
| |
| 作者姓名： | 赵芸 梁吉 李峰 段雪 |
| |
| 作者单位： | [1]DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing100084,China [2]KeyLaboratoryofScienceandTechnologyofControllableChemicalReactionsoftheMinistryofEducation,BeijingUniversityofChemicalTechnology,Beijing100029,China |
| |
| 摘 要： | Investigation of selectivity of crystal growth direction in layered double hydroxides is helpful to control their particle sizes in different directions. Mg-AI layered double hydroxides (LDHs) were synthesized using a coprecipitation method. The influences of aging temperature, aging time, and Mg/AI molar ratio on the crystal structure, the LDHs particle size, and the selectivity of crystal growth in different directions wereinvestigated. 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/AI 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/AI molar ratio decreases. The influence of the aging time, aging temperature, and Mg/AI 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.
|
| 关 键 词： | 分层材料 金属材料 金相分析 晶体生长 选择性 粒度 分层双氢氧化物 |
Selectivity of Crystal Growth Direction in Layered Double Hydroxides |
| |
| ZHAO Yun,LIANG Ji,LI Feng,DUAN Xue.Selectivity of Crystal Growth Direction in Layered Double Hydroxides[J].Tsinghua Science and Technology,2004,9(6):672-675. |
| |
| Authors: | ZHAO Yun LIANG Ji LI Feng DUAN Xue |
| |
| Institution: | ZHAO Yun,LIANG Ji,LI Feng,DUAN Xue Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China,Key Laboratory of Science and Technology of Controllable Chemical Reactions of the Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China |
| |
| Abstract: | Investigation of selectivity of crystal growth direction in layered double hydroxides is helpful to control their particle sizes in different directions. Mg-AI layered double hydroxides (LDHs) were synthesized using a coprecipitation method. The influences of aging temperature, aging time, and Mg/AI 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/AI 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/AI molar ratio decreases. The influence of the aging time, aging temperature, and Mg/AI 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. |
| |
| Keywords: | layered double hydroxides selectivity of crystal growth direction particle size |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
