Liquid-Gel-Liquid Transition and Shear Thickening in Mixed Suspensions of Silica Colloid and Hyperbranched Polyethyleneimine
文献类型：期刊论文
| 作者 | Zhang, Huan1,2; Yuan, Guangcui1; Zhao, Chuanzhuang1; Han, Charles C.1 |
| 刊名 | LANGMUIR
 |
| 出版日期 | 2013-10-01 |
| 卷号 | 29期号:39页码:12110-12117 |
| ISSN号 | 0743-7463 |
| DOI | 10.1021/la402577q |
| 英文摘要 | The rheological property of mixed suspensions of silica colloid and hyperbranched polyethyleneimine (hPEI) was studied as functions of particle volume fraction, ratio of polymer to particle, and pH value. A mechanism of liquid-gel-liquid transition for this mixed system was proposed based on the amount and the conformation of polyelectrolyte bridges which were able to self-arrange with solution environments. The hPEI, which is adsorptive to the surface of silica colloid, can induce bridging or stabilizing effect between particles depending on whether the concentration of hPEI (C-p) is smaller or larger than the equilibrium adsorbed amount (C-p*) for a given volume fraction of particles. In dilute colloid suspensions, the C-p* can be determined by dynamic light scattering as the correlation function returns back to a narrow distributing single relaxation with increasing C-p. In concentrated colloid suspensions, the C-p* can be determined by rheological measurement as gel-liquid transition occurs with increasing C-p. The C-p* is an important concentration ratio of polymer to particle denoting the transition of irreversible and reversible bridging. For mixed suspensions at equilibrium adsorbed state (C-p approximate to C-p*), the adsorption desorption of polymer bridges on the particles can reversibly take place, and shear thickening is observed under a steady shear flow as a result of rapid extension of bridges when the relaxation time scale of extension is shorter than that of desorption. |
| 语种 | 英语 |
| WOS记录号 | WOS:000330148800006 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/53851]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Yuan, Guangcui |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci,Inst Chem, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Huan,Yuan, Guangcui,Zhao, Chuanzhuang,et al. Liquid-Gel-Liquid Transition and Shear Thickening in Mixed Suspensions of Silica Colloid and Hyperbranched Polyethyleneimine[J]. LANGMUIR,2013,29(39):12110-12117. |
| APA | Zhang, Huan,Yuan, Guangcui,Zhao, Chuanzhuang,&Han, Charles C..(2013).Liquid-Gel-Liquid Transition and Shear Thickening in Mixed Suspensions of Silica Colloid and Hyperbranched Polyethyleneimine.LANGMUIR,29(39),12110-12117. |
| MLA | Zhang, Huan,et al."Liquid-Gel-Liquid Transition and Shear Thickening in Mixed Suspensions of Silica Colloid and Hyperbranched Polyethyleneimine".LANGMUIR 29.39(2013):12110-12117. |
入库方式： OAI收割
来源：化学研究所
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