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. | |
Source Publication | MICROGRAVITY SCIENCE AND TECHNOLOGY |
2016 | |
Volume | 28Issue:2Pages:95-100 |
ISSN | 0938-0108 |
Abstract | 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. |
Keyword | Thermocapillary Convection Cylindrical Annulus Payload Space Experiment Microgravity Fluid Physics |
DOI | 10.1007/s12217-015-9477-2 |
URL | 查看原文 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000376652000003 |
WOS Keyword | Thermocapillary convection ; Cylindrical annulus ; Payload ; Space experiment ; Microgravity fluid physics |
WOS Research Area | Engineering ; Thermodynamics ; Mechanics |
WOS Subject | Engineering, Aerospace ; Thermodynamics ; Mechanics |
Funding Organization | 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. |
Department | NML复杂流体 |
Classification | 二类 |
Ranking | False |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/59560 |
Collection | 微重力重点实验室 |
Corresponding Author | Sun, DJ (reprint author), Shandong Univ, Minist Educ, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China. |
Recommended Citation 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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