Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics
文献类型：期刊论文
| 作者 | Zhao, Bintao1,2; Yuan, Guangcui3; Chu, Xiao1; Yang, Jingfa1; Zhao, Jiang1 |
| 刊名 | LANGMUIR
 |
| 出版日期 | 2018-06-12 |
| 卷号 | 34期号:23页码:6757-6765 |
| ISSN号 | 0743-7463 |
| DOI | 10.1021/acs.langmuir.8b01195 |
| 英文摘要 | Structure and dynamics inside permanently charged polyelectrolyte brushes, sodium polystyrene sulfonate brushes, during their response to the introduction of external ions (NaCI) are investigated by neutron reflectivity and dielectric spectroscopy. Neutron reflectivity measurements show that the segmental density of the inner part of the brushes decreases and that of the outer part increases when the salt level is tuned from the salt-free condition to a moderate level (<10(-2) M)-the brushes swell further compared with the salt-free condition. This is attributed to the breakup of the multiplets formed by dipole-dipole pairs, and by this process, the previously constrained chain segments by the multiplets are released. Dielectric spectroscopy discovers a giant dipole by the charge separation of the adsorbed counterions and the PSS- chains, induced by electric field. The dynamics of the induced giant dipole is accelerated with the increase of external salt, as a result of the charge regularization by elevated salt level. At high-enough salt level, the screening effect reduces the electrostatic repulsion between the neighboring chains and makes the brushes |
| 语种 | 英语 |
| WOS记录号 | WOS:000435417300014 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/42511]  |
| 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, Inst Chem, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA |
| 推荐引用方式 GB/T 7714 | Zhao, Bintao,Yuan, Guangcui,Chu, Xiao,et al. Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics[J]. LANGMUIR,2018,34(23):6757-6765. |
| APA | Zhao, Bintao,Yuan, Guangcui,Chu, Xiao,Yang, Jingfa,&Zhao, Jiang.(2018).Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics.LANGMUIR,34(23),6757-6765. |
| MLA | Zhao, Bintao,et al."Response of a Permanently Charged Polyelectrolyte Brush to External Ions: The Aspects of Structure and Dynamics".LANGMUIR 34.23(2018):6757-6765. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。