| Dramatically Tuning Friction Using Responsive Polyelectrolyte Brushes | |
| Department | 固体润滑国家重点实验室 |
Wei QB(魏强兵)1,2 ; Cai MR(蔡美荣)1; Zhou F(周峰)1; Liu WM(刘维民)1; Zhou F(周峰); Liu WM(刘维民)
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| 2013 | |
| Source Publication | Macromolecules
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| ISSN | 0024-9297 |
| Volume | 46Issue:23Pages:9368-9379 |
| Abstract | We present a paradigm that dramatically tunes friction from superior lubrication (μ ∼ 10−3) to ultrahigh friction (μ > 1) using responsive polyelectrolyte brushes. The tunable friction is based on counterion-driven interactions in polyelectrolyte brushes that can be simply achieved by exchanging the counterions. We systematically investigated the effects of opposite counterions of different types on the friction properties of polyanionic, polycationic, and polyzwitterionic brushes. For cationic brushes with quaternary ammonium groups, the friction coefficient was progressively tuned from ∼10−3 to ∼100 according to the counterions series Cl− < ClO4− < PF6− < TFSI−. The friction of anionic brushes can be tuned by oppositely charged surfactants (tetraalkylammonium) with different length of hydrophobic tails, multivalent metal ions, and protons. The friction increase of cationic brushes is due to the dehydration and the collapse of polyelectrolyte chains induced by ion-pairing interactions. For anionic brushes, the friction increased with the length of hydrophobic tails of surfactants, which resulted from hydrophobicity induced electrostatic interaction among surfactants and polymer chains. The anionic brushes with the carboxylate and the sulfonate side groups revealed different friction responses, which is owing to the carboxylate groups getting stronger specific interaction with the quaternary ammonium and thus with the multivalent metal ions as well. The mechanism of tuning friction was finally concluded; that is, highly hydrated and swelling polymer brushes show superior lubrication, partially collapsed polymer chains have moderate lubrication, and completely dehydrated and collapsed conformation loses lubricating capability. |
| Subject Area | 材料科学与物理化学 |
| DOI | 10.1021/ma401537j |
| Funding Organization | the National Natural Science Foundation of China (21125316;21204095;51171202);973 project (2013CB632300);Key Research Program of the Chinese Academy of Sciences (grant KJZD-EW-M01) |
| Indexed By | SCI |
| If | 5.927 |
| Language | 英语 |
| Funding Project | 材料表面与界面行为研究组;空间润滑材料组 |
| compositor | 第一作者单位 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.licp.cn/handle/362003/4751 |
| Collection | 固体润滑国家重点实验室（LSL） |
| Corresponding Author | Zhou F(周峰); Liu WM(刘维民) |
| Affiliation | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Wei QB,Cai MR,Zhou F,et al. Dramatically Tuning Friction Using Responsive Polyelectrolyte Brushes[J]. Macromolecules,2013,46(23):9368-9379. |
| APA | Wei QB,Cai MR,Zhou F,Liu WM,周峰,&刘维民.(2013).Dramatically Tuning Friction Using Responsive Polyelectrolyte Brushes.Macromolecules,46(23),9368-9379. |
| MLA | Wei QB,et al."Dramatically Tuning Friction Using Responsive Polyelectrolyte Brushes".Macromolecules 46.23(2013):9368-9379. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Dramatically Tuning （1577KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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