| Reversible hydration and dehydration of polyanionic brushes bearing carboxylate, phosphate and sulfonate side groups: a comparative AFM study | |
| Department | 固体润滑国家重点实验室 |
Liu ZL(刘志鲁) ; Liu JX(刘建喜); Hu HY(胡海媛); Yu B(于波); Chen M(陈淼); Zhou F(周峰)
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| 2008 | |
| Source Publication | Physical Chemistry Chemical Physics
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| ISSN | 1463-9076 |
| Volume | 10Pages:7180–7185 |
| Abstract | The present work reports on a systematic study of the swelling/collapse transition of three anionic polymer brushes bearing carboxylate, phosphate and sulfonate side groups via AFM measurement. Time scale of conformation change process can be approximately evaluated directly. All the three brushes in their sodium salt forms stretch away from the surface in pure water, as a result of charge repulsion and uptake of water. The collapse of weak brushes has two ways: normal charge screening and precipitation (strong ion pairing), depending on the types of cations that have different coordination capabilities with anionic groups. Alkali metal ions can make brushes shrink only at relatively high concentrations following a gradually increased charge screening mechanism. The brushes collapsed in this way can be restored by simply flushing with water. However, multivalent cations can irreversibly collapse brushes more easily even under very low concentrations (o10 3mol L 1). The brushes cannot be restored with simple water rinsing even for strong sulfonate containing brushes. In this case, recovery can be achieved by ion exchange in concentrated salt solution, which facilitates transit from strong ion pairing to less strong charge screening and then flushing with water. Alternatively, the multivalent ion can be extracted with chelating reagent of low concentration (10 mM EDTA). As the chelating agent doesn’t affect the conformation of brushes, the brushes are one-step recovered directly, much more efficient than with high concentration electrolyte which usually requires extra water rinsing to remove excess salt inside brushes. The interaction between anions in the brushes and metal ions represents a model system to profoundly understand the mechanism of bio-mimic motions and how muscle works. In this regard, the present study provides useful information for the development of polyelectrolyte brushes based ion sensor and ion powered nanoactuators. |
| Subject Area | 材料科学与物理化学 |
| Funding Organization | the ‘‘Top Hundred Talents’’ Program of the Chinese Academy of Sciences;NSFC(50721602) |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 材料表面与界面行为研究组 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/2687 |
| Collection | 固体润滑国家重点实验室（LSL） |
| Corresponding Author | Zhou F(周峰) |
| Recommended Citation GB/T 7714 | Liu ZL,Liu JX,Hu HY,et al. Reversible hydration and dehydration of polyanionic brushes bearing carboxylate, phosphate and sulfonate side groups: a comparative AFM study[J]. Physical Chemistry Chemical Physics,2008,10:7180–7185. |
| APA | 刘志鲁,刘建喜,胡海媛,于波,陈淼,&周峰.(2008).Reversible hydration and dehydration of polyanionic brushes bearing carboxylate, phosphate and sulfonate side groups: a comparative AFM study.Physical Chemistry Chemical Physics,10,7180–7185. |
| MLA | 刘志鲁,et al."Reversible hydration and dehydration of polyanionic brushes bearing carboxylate, phosphate and sulfonate side groups: a comparative AFM study".Physical Chemistry Chemical Physics 10(2008):7180–7185. |
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| 20087180-7185.PDF（1418KB） | 开放获取 | License | View Application Full Text | |||
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