| Charge on a weak polyelectrolyte | |
| Wang, Shengqin1,2; Granick, Steve3,4,5; Zhao, Jiang1 | |
| 刊名 | Journal of chemical physics
 |
| 2008-12-28 | |
| 卷号 | 129期号:24页码:4 |
| 关键词 | Brightness Fluorescence Ionisation Ph Polymer electrolytes Spectrochemical analysis |
| ISSN号 | 0021-9606 |
| DOI | 10.1063/1.3055596 |
| 通讯作者 | Zhao, jiang(jzhao@iccas.ac.cn) |
| 英文摘要 | Fluorescence measurements with single-molecule sensitivity are used to measure the hydrodynamic size and local ph of a weak polyelectrolyte, poly-2-vinyl pyridine end labeled with ph-sensitive dye, the polyelectrolyte having concentration so low (nanomolars) that molecular properties are resolvable only from fluorescence experiments and cannot be accessed by light scattering. we find that the local ph near the dye, inferred from its brightness, is consistently three orders of magnitude higher than the bulk ph. upon varying the bulk ph, we measure the collapse point at which hydrophobic attraction overwhelms electrostatic repulsion between charged elements along the chain, and conclude that adding monovalent salt shifts this coil-to-globule collapse to higher ph than in the absence of salt. the influence of salt appears to shift the ionization equilibrium of this weak polyelectrolyte in the direction of the chain possessing enhanced electric charge at a given ph. phenomenologically, this is opposite to the case for strong polyelectrolytes, although the mechanism differs. |
| WOS关键词 | PHOTON-COUNTING HISTOGRAM ; COUNTERION CONDENSATION ; OSMOTIC-PRESSURE ; SALT ; TRANSITION ; SURFACES |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Atomic, Molecular & Chemical |
| 语种 | 英语 |
| 出版者 | AMER INST PHYSICS |
| WOS记录号 | WOS:000262226800002 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2389781 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Zhao, Jiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Joint Lab Polymer Sci & Mat, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Univ Illinois, Dept Mat Sci, Urbana, IL 61801 USA 4.Univ Illinois, Dept Chem, Urbana, IL 61801 USA 5.Univ Illinois, Dept Phys, Urbana, IL 61801 USA |
| 推荐引用方式 GB/T 7714 | Wang, Shengqin,Granick, Steve,Zhao, Jiang. Charge on a weak polyelectrolyte[J]. Journal of chemical physics,2008,129(24):4. |
| APA | Wang, Shengqin,Granick, Steve,&Zhao, Jiang.(2008).Charge on a weak polyelectrolyte.Journal of chemical physics,129(24),4. |
| MLA | Wang, Shengqin,et al."Charge on a weak polyelectrolyte".Journal of chemical physics 129.24(2008):4. |
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