Polyelectrolyte uptake by PEMs: Impact of salt concentration
文献类型：期刊论文
| 作者 | Zan, Xingjie1; Peng, Bo1; Hoagland, David A.2; Su, Zhaohui1 |
| 刊名 | POLYMER CHEMISTRY
 |
| 出版日期 | 2011 |
| 卷号 | 2期号:11页码:2581-2589 |
| ISSN号 | 1759-9954 |
| DOI | 10.1039/c1py00280e |
| 英文摘要 | In a two-step process, polyelectrolytes are added to existing layer-by-layer (LbL)-constructed polyelectrolyte multilayer films (PEMs), generating versatile new films as well as fundamental insights into LbL assembly mechanisms. First, PEM swelling is affected by exposure to aqueous salt solutions of high concentration, and second, polyelectrolyte is added to the swollen PEM at the same high salt concentration. Our strategy is illustrated by adding poly(styrene sulfonate) (PSS) to poly (diallyldimethylammonium chloride)/PSS PEMs swollen by NaCl, the rebuilding steps tracked by the quartz crystal microbalance with dissipation, or QCM-D, approach. From the swelling after the first step, the association free energy of polycation and polyanion units is derived, similar to-7.0 kJ mol(-1). Swelling by salt strongly affects the rate of attachment, depth of permeation, and rate of diffusion of PSS. At low salt ([NaCl] less than similar to 1 M for PEMs constructed at [NaCl] = 0.5 M), PSS is added only at/near the PEM surface, while at high salt ([NaCl] greater than similar to 1 M for the same PEMs), PSS fully permeates the PEM, contributing a PSS mass that can approach or exceed that already present; higher salt leads to greater PSS uptake. Even with sizable PSS addition, uptake kinetics is closely diffusive, characterized by surprisingly large and sharply [NaCl]-dependent diffusion coefficients (similar to 10(-14)-10(-12) cm(2) s(-1)). The kinetics at high salt concentreation offer no evidence of slow PEM reorganization, although at low salt concentration, such reorganization remains possible. |
| 语种 | 英语 |
| WOS记录号 | WOS:000295811400019 |
| 出版者 | ROYAL SOC CHEMISTRY |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/73805]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Su, Zhaohui |
| 作者单位 | 1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA |
| 推荐引用方式 GB/T 7714 | Zan, Xingjie,Peng, Bo,Hoagland, David A.,et al. Polyelectrolyte uptake by PEMs: Impact of salt concentration[J]. POLYMER CHEMISTRY,2011,2(11):2581-2589. |
| APA | Zan, Xingjie,Peng, Bo,Hoagland, David A.,&Su, Zhaohui.(2011).Polyelectrolyte uptake by PEMs: Impact of salt concentration.POLYMER CHEMISTRY,2(11),2581-2589. |
| MLA | Zan, Xingjie,et al."Polyelectrolyte uptake by PEMs: Impact of salt concentration".POLYMER CHEMISTRY 2.11(2011):2581-2589. |
入库方式： OAI收割
来源：化学研究所
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