| Influence of sedimentation on crystallization of charged colloidal particles | |
Du H(杜嬛) ; Xu SH(徐升华); Sun ZW(孙祉伟); Liu L(刘蕾); Sun, ZW; Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China.
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| Source Publication | CHINESE JOURNAL OF CHEMICAL PHYSICS
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| 2012-06-27 | |
| Volume | 25Issue:3Pages:318-324 |
| ISSN | 1674-0068 |
| Abstract | The method of density matching between the solid and liquid phases is often adopted to effectively eliminate the effect of sedimentation of suspensions on dynamic behavior of a colloidal system. Experiments on crystallization of charged colloidal microspheres with diameter of 98 nm dispersed in density-matched and -unmatched media (mixtures of H2O and D2O in proper proportion) are compared to examine the influence of sedimentation. Reflection spectra of colloidal suspensions were used to monitor the crystallization process. Results showed that the crystal size of the density-unmatched (namely, in the presence of sedimentation) sample grew faster than that of the density-matched (in the absence of sedimentation) case at the initial stage of the crystallization, and then the latter overtook and outstripped the former. To explain these observations, we assume that in the settling of crystals sedimentation facilitates result in more particles getting into the crystal structures. However, as the crystals increase to varying sizes, the settling velocities become large and hydrodynamic friction strips off some particles from the delicate crystal structures. Overall, the sedimentation appears to accelerate the crystal size growth initially and then retard the growth. In addition, the crystal structures formed under microgravity were more closely packed than that in normal gravity. |
| Keyword | Colloidal Crystal Density Matching Sedimentation Reflection Spectrum Debye-screening Length Kossel Line Analysis Hard-sphere Binary-mixtures Kinetic Analyses Microscopic Observation Polystyrene Spheres Ordered Colloids Phase-transition Suspensions |
| Subject Area | 物理力学 |
| URL | 查看原文 |
| Indexed By | SCI ; CSCD |
| Language | 英语 |
| WOS ID | WOS:000306535500011 |
| Funding Organization | This work was supported by the National Natural Science Foundation of China (No.11172302, No.10972217 and No.11032011), the Knowledge Innovation Program of the Chinese Academy of Sciences (No.KJCX2-YW-L08) and the National Science Foundation for Post-doctoral Scientists of China (No.20100480482). |
| Department | NML复杂流体 |
| Classification | Q4 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/46588 |
| Collection | 微重力重点实验室 |
| Corresponding Author | Sun, ZW; Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Du H,Xu SH,Sun ZW,et al. Influence of sedimentation on crystallization of charged colloidal particles[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2012,25,3,:318-324. |
| APA | Du H,Xu SH,Sun ZW,Liu L,Sun, ZW,&Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing 100190, Peoples R China..(2012).Influence of sedimentation on crystallization of charged colloidal particles.CHINESE JOURNAL OF CHEMICAL PHYSICS,25(3),318-324. |
| MLA | Du H,et al."Influence of sedimentation on crystallization of charged colloidal particles".CHINESE JOURNAL OF CHEMICAL PHYSICS 25.3(2012):318-324. |
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