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Citation: NI Zhe-Ming, XU Qian, YAO Ping, MAO Jiang-Hong, LIU Xiao-Ming. Influence of Interlayer Water Content on theMechanical Properties of Mg₃Al-LDHs-Cl[J]. Acta Physico-Chimica Sinica, ;2009, 25(11): 2325-2328. doi: 10.3866/PKU.WHXB20091035 shu

Influence of Interlayer Water Content on theMechanical Properties of Mg₃Al-LDHs-Cl

1.
Laboratory of Advanced Catalytic Materials, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310032, P. R. China

Received Date: 21 May 2009
Available Online: 9 September 2009

A periodical model for Mg3Al-LDHs-Cl-nH2O has been proposed. A geometry optimization and elastic constant calculation for the layered double hydroxides (LDHs) were carried out using the CASTEP/LDA (local density approximation) procedure at the CA-PZ level. The influence of interlayer water content (n) on the mechanical properties of the materials was investigated by analyzing the elastic constants Cij, shear modulus, Young's modulus, and Poisson's ratio, etc. Results indicated that the interlayer water content greatly impacted the mechanical properties of the materials. Interlayer water can enhance the compression properties of the overall system. When n=1, the compression properties of the material was best. When n=2, the capacity of the material to resist shear deformation was the worst and the system was most flexible. Interlayer water molecules greatly impacted the Young's modulus of the material while the impact on Poisson's ratio was not obvious. Interlayer water molecules played a horizontal role of averaging the mechanical properties of the materials. The compression performance and the expansion of the material in the x-axis and y-axis tended to be the same.
- Density functional theory,
- Elastic constant,
- Interlayer water molecule content,
- Layered double hydroxide
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Influence of Interlayer Water Content on theMechanical Properties of Mg3Al-LDHs-Cl

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通讯作者: 陈斌, bchen63@163.com

Influence of Interlayer Water Content on theMechanical Properties of Mg₃Al-LDHs-Cl