Gelation of large hard particles with short-range attraction induced by bridging of small soft microgels
文献类型：期刊论文
| 作者 | Luo, Junhua1,2 ; Yuan, Guangcui1; Zhao, Chuanzhuang3; Han, Charles C.1; Chen, Jie4; Liu, Yun4,5
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| 刊名 | SOFT MATTER
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| 出版日期 | 2015 |
| 卷号 | 11期号:12页码:2494-2503 |
| 英文摘要 | In this study, mixed suspensions of large hard polystyrene microspheres and small soft poly(N-isopropylacrylamide) microgels are used as model systems to investigate the static and viscoelastic properties of suspensions which go through liquid to gel transitions. The microgels cause short-range attraction between microspheres through the bridging and depletion mechanism whose strength can be tuned by the microgel concentration. Rheological measurements are performed on suspensions with the volume fraction (Phi) of microspheres ranging from 0.02 to 0.15, and the transitions from liquid-like to solid-like behaviors triggered by the concentration of microgels are carefully identified. Two gel lines due to bridging attraction under unsaturated conditions are obtained. Ultrasmall angle neutron scattering is used to probe the thermodynamic properties of suspensions approaching the liquid-solid transition boundaries. Baxter's sticky hard-sphere model is used to extract the effective inter-microsphere interaction introduced by the small soft microgels. It is found that the strength of attraction (characterized by a single stickiness parameter tau) on two gel lines formed by bridging is very close to the theoretical value for the spinodal line in the tau-Phi phase diagram predicted by Baxter's model. This indicates that the nature of the gel state may have the same thermodynamic origins, independent of the detailed mechanism of the short-range attraction. The relationship between the rheological criterion for the liquid-solid transition and the thermodynamic criterion for the equilibrium-nonequilibrium transition is also discussed. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2015-11-03 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/28436]  |
| 专题 | 化学研究所_高分子物理与化学实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Joint Lab Polymer Sci & Mat,State Key Lab Polymer, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Ningbo Univ, Fac Mat Sci & Chem Engn, Dept Polymer Sci & Engn, Ningbo 315211, Zhejiang, Peoples R China 4.Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA 5.Univ Delaware, Dept Chem & Biomol Engn, Newark, DE 19716 USA |
| 推荐引用方式 GB/T 7714 | Luo, Junhua,Yuan, Guangcui,Zhao, Chuanzhuang,et al. Gelation of large hard particles with short-range attraction induced by bridging of small soft microgels[J]. SOFT MATTER,2015,11(12):2494-2503. |
| APA | Luo, Junhua,Yuan, Guangcui,Zhao, Chuanzhuang,Han, Charles C.,Chen, Jie,&Liu, Yun.(2015).Gelation of large hard particles with short-range attraction induced by bridging of small soft microgels.SOFT MATTER,11(12),2494-2503. |
| MLA | Luo, Junhua,et al."Gelation of large hard particles with short-range attraction induced by bridging of small soft microgels".SOFT MATTER 11.12(2015):2494-2503. |
入库方式： OAI收割
来源：化学研究所
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