Experimental Study of Gravitation Effects on Liquid Crystal Phase Transitions in Polydisperse Aqueous Suspensions of Mg Al-2 Layered Double Hydroxide

doi:10.1007/s12217-015-9477-2

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	Experimental Study of Gravitation Effects on Liquid Crystal Phase Transitions in Polydisperse Aqueous Suspensions of Mg Al-2 Layered Double Hydroxide
	Chen Y; Zhang L; Sun DJ; Sun ZW(孙址伟); Xu SH(徐升华); Sun, DJ (reprint author), Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
发表期刊	MICROGRAVITY SCIENCE AND TECHNOLOGY
	2016
卷号	28 期号:2 页码:95-100
ISSN	0938-0108
摘要	Effects of gravity on liquid crystal phase transitions (LCPT) in polydisperse aqueous suspensions of Mg Al-2 layered double hydroxide (LDHs) were studied under normal gravity condition. Samples with different suspension concentration (SC) were tested for 15 days and the relevant changes in samples were observed through crossed polarizers. Our results showed: (a) the samples were still isotropic (I) when SC < 23 wt%; (b) when 23 wt% < SC < 30 wt%, a shear-induced birefringence appeared after preparation, and finally coexistence of four phases was reached, including an opaque isotropic top phase, a birefringent middle phase, a faint birefringence phase and a sediment layer of larger platelets resulting from the high polydispersity; (c) when SC > 30 wt%, the suspensions were in a gel state, and the gel network slowed down the LCPT. The above different behavior of phase transitions is apparently due to the concentration gradient and fractionation caused by gravity. This study provides guidance on how to select samples of LDHs suspensions for LCPT used in the upcoming experiment in the space program SJ-10 satellite.
关键词	Thermocapillary Convection Cylindrical Annulus Payload Space Experiment Microgravity Fluid Physics
DOI	10.1007/s12217-015-9477-2
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000376652000003
关键词[WOS]	Thermocapillary convection ; Cylindrical annulus ; Payload ; Space experiment ; Microgravity fluid physics
WOS研究方向	Engineering ; Thermodynamics ; Mechanics
WOS类目	Engineering, Aerospace ; Thermodynamics ; Mechanics
项目资助者	We are grateful for the National Natural Science Foundation of China (Grant 21333005). We also thank the editor and reviewers for the useful comments and suggestions.
课题组名称	NML复杂流体
论文分区	二类
力学所作者排名	False
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/59560
专题	微重力重点实验室
通讯作者	Sun, DJ (reprint author), Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
推荐引用方式 GB/T 7714	Chen Y,Zhang L,Sun DJ,et al. Experimental Study of Gravitation Effects on Liquid Crystal Phase Transitions in Polydisperse Aqueous Suspensions of Mg Al-2 Layered Double Hydroxide[J]. MICROGRAVITY SCIENCE AND TECHNOLOGY,2016,28,2,:95-100.
APA	Chen Y,Zhang L,Sun DJ,孙址伟,徐升华,&Sun, DJ .(2016).Experimental Study of Gravitation Effects on Liquid Crystal Phase Transitions in Polydisperse Aqueous Suspensions of Mg Al-2 Layered Double Hydroxide.MICROGRAVITY SCIENCE AND TECHNOLOGY,28(2),95-100.
MLA	Chen Y,et al."Experimental Study of Gravitation Effects on Liquid Crystal Phase Transitions in Polydisperse Aqueous Suspensions of Mg Al-2 Layered Double Hydroxide".MICROGRAVITY SCIENCE AND TECHNOLOGY 28.2(2016):95-100.

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