Swelling enhancement of polyelectrolyte brushes induced by external ions
文献类型：期刊论文
| 作者 | Chu, Xiao1,2; Yang, Jingfa1; Liu, Guangming3; Zhao, Jiang1 |
| 刊名 | SOFT MATTER
 |
| 出版日期 | 2014 |
| 卷号 | 10期号:30页码:5568-5578 |
| ISSN号 | 1744-683X |
| DOI | 10.1039/c4sm00860j |
| 英文摘要 | It has been observed previously that when permanently charged polyelectrolyte brushes are exposed to an external salt solution, they shrink when the salt level is high enough. In this study, we observed an enhanced swelling process before the salt concentration reached that limit. We systematically investigated a few strong polyelectrolyte brush systems, including sodium polystyrene sulfonate (PSSNa), poly([2-(methacryloyloxy)ethyl] trimethylammonium chloride) (PMETAC) and potassium poly(3-sulfopropyl methacrylate) (PSPMA) with different molecular weights and grafting density using a combination of methods, including ellipsometry, quartz crystal microbalance with dissipation (QCM-D) and atomic force microscope (AFM). The swelling enhancement is expressed by the thickening of the brush layer at moderate salt concentrations, accompanied by the decrease of refractive index, the increase of the amount of solvent inside the brushes and an increase in retardation time. A scenario is proposed in which the counterions penetrate into the brushes driven by the external salt ions, they disrupt and break up the previously formed multiplets due to the dipole-dipole interaction by the ion-pairs on the polymer chain. This process results in the release of the bound segments and the stretching of the polymer chains. |
| 语种 | 英语 |
| WOS记录号 | WOS:000339670700015 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/52501]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhao, Jiang |
| 作者单位 | 1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Dept Chem Phys, Hefei 230026, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chu, Xiao,Yang, Jingfa,Liu, Guangming,et al. Swelling enhancement of polyelectrolyte brushes induced by external ions[J]. SOFT MATTER,2014,10(30):5568-5578. |
| APA | Chu, Xiao,Yang, Jingfa,Liu, Guangming,&Zhao, Jiang.(2014).Swelling enhancement of polyelectrolyte brushes induced by external ions.SOFT MATTER,10(30),5568-5578. |
| MLA | Chu, Xiao,et al."Swelling enhancement of polyelectrolyte brushes induced by external ions".SOFT MATTER 10.30(2014):5568-5578. |
入库方式： OAI收割
来源：化学研究所
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