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Influence of Gravity on Structure of Colloidal Crystal Using Simulated Microgravity
Lei Liu,Jie Wang,Sheng-hua Xu,Zhi-wei Sun *,Jing-tong Wang
Author NameAffiliationE-mail
Lei Liu National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China  
Jie Wang National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China  
Sheng-hua Xu National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China  
Zhi-wei Sun * National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China sunzw@imech.ac.cn 
Jing-tong Wang Department of Physics, Southern University and A&M College, Baton Rouge, LA 70813, USA  
Abstract:
Liquid mixtures of water and deuterium oxide as the liquid phase, were used to match the density of charged colloidal particles. Kossel diffraction method was used to detect the crystal structures. The experiments under the density-matched (g=0) and unmatched (g=1) conditions are compared to examine the influence of gravity on the crystal structures formed by self-assembly of 110 nm (in diameter) polystyrene microspheres. The result shows that the gravity tends to make the lattice constants of colloidal crystals smaller at lower positions,which indicates that the effect of gravity should be taken into account in the study of thecolloidal crystals.
Key words:  Colloidal crystal, Microgravity, Density-match, Lattice constant
FundProject:
Influence of Gravity on Structure of Colloidal Crystal Using Simulated Microgravity
刘蕾,王杰,徐升华,孙祉伟 *,汪金通
摘要:
将重水(D2O)和水(H2O)以一定比例混合来匹配直径为110 nm的聚苯乙烯带电小球的密度,并利用Kossel衍射方法测量了胶体晶体的结构和晶格常数等参数.通过将密度匹配(g=0)和没有进行密度匹配(g=1)的实验结果的对比,发现重力将会使样品池中胶体晶体的晶格常数随高度的变低而变小.这一结果表明,在带电粒子胶体晶体的研究中有必要考虑重力的影响
关键词:  胶体晶体,微重力,密度匹配,晶格常数
DOI:10.1088/1674-0068/22/01/41-45
分类号: