Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes
文献类型：期刊论文
| 作者 | Gao, Zhi-Fu1 ; Zhao, Xin-Jun2,3
|
| 刊名 | CHINESE PHYSICS B
 |
| 出版日期 | 2019-06-01 |
| 卷号 | 28期号:6页码:8 |
| 关键词 | molecular theory PNIPAM brushes effect of thiocyanate anions |
| ISSN号 | 1674-1056 |
| DOI | 10.1088/1674-1056/28/6/064701 |
| 通讯作者 | Zhao, Xin-Jun(zhaoxinjunzxj@163.com) |
| 英文摘要 | In this work, we investigate the effects of thiocyanate anions on the switching and the structure of poly (N-isopropylacrylamide) (PNIPAM) brushes using a molecular theory. Our model takes into consideration the PNIPAM-anion bonds, the electrostatic effects and their explicit coupling to the PNIPAM conformations. It is found that at low thiocyanate anion concentration, as the anion concentration of thiocyanate increases, thiocyanate anions are more associated with PNIPAM chains through the PNIPAM-anion bonds, which contributes to stronger electrostatic repulsion and leads to an increase of lower critical solution temperature (LCST). By analyzing the average volume fractions of PNIPAM brushes, it is found that the PNIPAM brush presents a plateau structure. Our results show that the thiocyanate anions promote phase segregation due to the PNIPAM-anion bonds and the electrostatic effect. According to our model, the reduction of LCST can be explained as follows: at high thiocyanate anion concentration, with the increase of thiocyanate concentration, more ion bindings occurring between thiocyanate anions and PNIPAM chains will result in the increase of the hydrophobicity of PNIPAM chains; when the increase of electrostatic repulsion is insufficient to overcome the hydrophobic interaction of PNIPAM chains, it will lead to the reduction of brush height and LCST at high thiocyanate anion concentration. Our theoretical results are consistent with the experimental observations, and provide a fundamental understanding of the effects of thiocyanate on the LCST of PNIPAM brushes. |
| WOS关键词 | CRITICAL SOLUTION TEMPERATURE ; COIL-GLOBULE TRANSITION ; PHASE-TRANSITION ; AQUEOUS-SOLUTIONS ; POLYMER LAYERS ; SALT ; WETTABILITY ; INSIGHTS ; IDENTITY ; BEHAVIOR |
| 资助项目 | Joint Funds of Xinjiang Natural Science Foundation[2019D01C333] ; National Natural Science Foundation of China[11847610] ; National Natural Science Foundation of China[21764015] ; National Basic Research Program of China[2015CB857100] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000471647300001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | Joint Funds of Xinjiang Natural Science Foundation ; National Natural Science Foundation of China ; National Basic Research Program of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/2802]  |
| 专题 | 脉冲星研究团组 新疆天文台_110米口径全可动射电望远镜（SmART）_110米大口径全可动射电望远镜关键技术研究（973项目）_课题1：大样本射电天体的观测和前沿问题研究 |
| 通讯作者 | Zhao, Xin-Jun |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Peoples R China 2.Yili Normal Univ, Lab Micronano Electro Biosensors & Bion Devices, Yining 835000, Peoples R China 3.Yili Normal Univ, Xinjiang Lab Phase Transit & Microstruct Condense, Yining 835000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gao, Zhi-Fu,Zhao, Xin-Jun. Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes[J]. CHINESE PHYSICS B,2019,28(6):8. |
| APA | Gao, Zhi-Fu,&Zhao, Xin-Jun.(2019).Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes.CHINESE PHYSICS B,28(6),8. |
| MLA | Gao, Zhi-Fu,et al."Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes".CHINESE PHYSICS B 28.6(2019):8. |
入库方式： OAI收割
来源：新疆天文台
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