| Influence of the surface charge on the homogeneity of colloidal crystals | |
Zhou HW(周宏伟) ; Xu SH(徐升华); Ouyang WZ(欧阳文泽); Sun ZW(孙祉伟); Liu LX(刘丽霞); Xu, SH (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Micrograv, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
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| Source Publication | JOURNAL OF CHEMICAL PHYSICS
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| 2013-08-14 | |
| Volume | 139Issue:6Pages:064904/1-064904/7 |
| ISSN | 0021-9606 |
| Abstract | Five groups of suspensions composed of polystyrene particles, having similar size but different effective surface charge, were adopted to investigate the effects of surface charge and volume fraction on the homogeneity of colloidal crystals through checking the difference between D-exp and D-uni by reflection spectroscopy method (D-exp, D-uni are the experimental and the expected value of the average nearest neighbor interparticle distance by assuming a uniform structure, respectively). We found volume fractions (ranging from 0.006 to 0.02) and structure types basically have no influence on the values of D-exp/D-uni. Moreover, for crystals formed by lowly charged particles, D-exp/D-uni is approximately equal to 1, implying the crystals are homogeneous. With the increase of effective surface charge, D-exp gradually deviates from D-uni and the formed crystals become inhomogeneous. Our experimental observations are in accordance with the previous simulation results. Additionally, we also found D-exp/D-uni initially drops quickly with increasing effective surface charge and then it tends to an asymptotic value (similar to 0.85), it is supposedly due to the saturation of effective charge. Our relevant computer simulations confirmed that the study scheme that using D-exp/D-uni as an indicator to assess the homogeneity of crystal structure is tenable and the simulation results are consistent with experiments. |
| Subject Area | 物理力学 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000323177900051 |
| Funding Organization | National Natural Science Foundation of China (NNSFC) [11172302, 10972217, 11032011, 20903112] |
| Department | NML复杂流体 |
| Classification | 二类/Q1 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/47414 |
| Collection | 微重力重点实验室 |
| Corresponding Author | Xu, SH (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Micrograv, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Zhou HW,Xu SH,Ouyang WZ,et al. Influence of the surface charge on the homogeneity of colloidal crystals[J]. JOURNAL OF CHEMICAL PHYSICS,2013,139,6,:064904/1-064904/7. |
| APA | Zhou HW,Xu SH,Ouyang WZ,Sun ZW,Liu LX,&Xu, SH .(2013).Influence of the surface charge on the homogeneity of colloidal crystals.JOURNAL OF CHEMICAL PHYSICS,139(6),064904/1-064904/7. |
| MLA | Zhou HW,et al."Influence of the surface charge on the homogeneity of colloidal crystals".JOURNAL OF CHEMICAL PHYSICS 139.6(2013):064904/1-064904/7. |
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