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| Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes | |
Zhao, Xin-Jun1,2; Gao, Zhi-Fu3
| |
| 2019-06-01 | |
| Source Publication | CHINESE PHYSICS B
 |
| ISSN | 1674-1056 |
| Volume | 28Issue:6Pages:064701 |
| Contribution Rank | 3 |
| Abstract | 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. |
| Keyword | molecular theory PNIPAM brushes effect of thiocyanate anions |
| DOI | 10.1088/1674-1056/28/6/064701 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | CRITICAL SOLUTION TEMPERATURE ; COIL-GLOBULE TRANSITION ; PHASE-TRANSITION ; AQUEOUS-SOLUTIONS ; POLYMER LAYERS ; SALT ; WETTABILITY ; INSIGHTS ; IDENTITY ; BEHAVIOR |
| Funding Project | 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 Research Area | Physics |
| WOS Subject | Physics, Multidisciplinary |
| WOS ID | WOS:000471647300001 |
| Publisher | IOP PUBLISHING LTD |
| Funding Organization | Joint Funds of Xinjiang Natural Science Foundation ; National Natural Science Foundation of China ; National Basic Research Program of China |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/2803 |
| Collection | 射电天文研究室_脉冲星研究团组 110米口径全可动射电望远镜（QTT）_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 |
| Corresponding Author | Zhao, Xin-Jun |
| Affiliation | 1.Yili Normal Univ, Xinjiang Lab Phase Transit & Microstruct Condense, Yining 835000, Peoples R China 2.Yili Normal Univ, Lab Micronano Electro Biosensors & Bion Devices, Yining 835000, Peoples R China 3.Chinese Acad Sci, Xinjiang Astron Observ, 150,Sci 1 St, Urumqi 830011, Peoples R China |
| Recommended Citation GB/T 7714 | Zhao, Xin-Jun,Gao, Zhi-Fu. Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes[J]. CHINESE PHYSICS B,2019,28(6):064701. |
| APA | Zhao, Xin-Jun,&Gao, Zhi-Fu.(2019).Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes.CHINESE PHYSICS B,28(6),064701. |
| MLA | Zhao, Xin-Jun,et al."Effects of thiocyanate anions on switching and structure of poly(N-isopropylacrylamide) brushes".CHINESE PHYSICS B 28.6(2019):064701. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Zhao-2019-Effects of（433KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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