Dynamic wetting on a thin film of soluble polymer: effects of nonlinearities in the sorption isotherm
文献类型：期刊论文
| 作者 | Dupas, Julien; Verneuil, Emilie; Ramaioli, Marco; Forny, Laurent; Talini, Laurence; Lequeux, Francois |
| 刊名 | Langmuir : the ACS journal of surfaces and colloids
 |
| 出版日期 | 2013-10-08 |
| 卷号 | 29期号:40页码:12572-8 |
| ISSN号 | 1520-5827 |
| DOI | 10.1021/la402157d |
| 文献子类 | Article |
| 英文摘要 | The wetting dynamics of a solvent on a soluble substrate interestingly results from the rates of the solvent transfers into the substrate. When a supported film of a hydrosoluble polymer with thickness e is wet by a spreading droplet of water with instantaneous velocity U, the contact angle is measured to be inversely proportionate to the product of thickness and velocity, eU, over two decades. As for many hydrosoluble polymers, the polymer we used (a polysaccharide) has a strongly nonlinear sorption isotherm φ(a(w)), where φ is the volume fraction of water in the polymer and aw is the activity of water. For the first time, this nonlinearity is accounted for in the dynamics of water uptake by the substrate. Indeed, by measuring the water content in the polymer around the droplet φ at distances as small as 5 μm, we find that the hydration profile exhibits (i) a strongly distorted shape that results directly from the nonlinearities of the sorption isotherm and (ii) a cutoff length ξ below which the water content in the substrate varies very slowly. The nonlinearities in the sorption isotherm and the hydration at small distances from the line were not accounted for by Tay et al., Soft Matter 2011, 7, 6953. Here, we develop a comprehensive description of the hydration of the substrate ahead of the contact line that encompasses the two water transfers at stake: (i) the evaporation-condensation process by which water transfers into the substrate through the atmosphere by the condensation of the vapor phase, which is fed by the evaporation from the droplet itself, and (ii) the diffusion of liquid water along the polymer film. We find that the eU rescaling of the contact angle arises from the evaporation-condensation process at small distances. We demonstrate why it is not modified by the second process. |
| 语种 | 英语 |
| 源URL | [http://119.78.100.183/handle/2S10ELR8/266579]  |
| 专题 | 中国科学院上海药物研究所 |
| 作者单位 | PPMD-SIMM, UMR 7615, CNRS, UPMC, ESPCI ParisTech, 10 rue Vauquelin, 75231 Paris, France |
| 推荐引用方式 GB/T 7714 | Dupas, Julien,Verneuil, Emilie,Ramaioli, Marco,et al. Dynamic wetting on a thin film of soluble polymer: effects of nonlinearities in the sorption isotherm[J]. Langmuir : the ACS journal of surfaces and colloids,2013,29(40):12572-8. |
| APA | Dupas, Julien,Verneuil, Emilie,Ramaioli, Marco,Forny, Laurent,Talini, Laurence,&Lequeux, Francois.(2013).Dynamic wetting on a thin film of soluble polymer: effects of nonlinearities in the sorption isotherm.Langmuir : the ACS journal of surfaces and colloids,29(40),12572-8. |
| MLA | Dupas, Julien,et al."Dynamic wetting on a thin film of soluble polymer: effects of nonlinearities in the sorption isotherm".Langmuir : the ACS journal of surfaces and colloids 29.40(2013):12572-8. |
入库方式： OAI收割
来源：上海药物研究所
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