Coupled Effects of Spreading Solvent Molecules and Electrostatic Repulsions on the Behavior of PS-b-PAA Monolayers at the Air-Water Interface
文献类型：期刊论文
| 作者 | Guennouni, Zineb1; Goldmann, Michel1; Fauré, Marie-Claude1; Fontaine, Philippe4; Perrin, Patrick3; Limagne, Denis1; Cousin, Fabrice2 |
| 刊名 | Langmuir : the ACS journal of surfaces and colloids
 |
| 出版日期 | 2017-10-31 |
| 卷号 | 33期号:43页码:12525-12534 |
| ISSN号 | 1520-5827 |
| DOI | 10.1021/acs.langmuir.7b02664 |
| 文献子类 | Article |
| 英文摘要 | We describe the surface behavior of PS-b-PAA monolayers at the air/water interface using N,N-dimethyformamide (DMF) as spreading solvent. At low pH, when the PAA blocks are neutral, the surface pressure versus molecular area isotherm shows a pseudoplateau associated with the presence of remaining spreading solvent molecules in the monolayer, as we described in a former study (Guennouni et al., Langmuir, 2016). We show here that the width of the plateau decreases when increasing pH up to its complete disappearance at high pH, when PAA blocks are fully charged, although two regimes of compressibilities on the isotherm still exist. A refined structural study at pH 9 combining specular neutron reflectivity (SNR), grazing-incidence small-angle X-ray scattering (GISAXS), and atomic force microscopy (AFM) in liquid measurements shows that (i) PAA blocks are stretched in solution, as expected from polyelectrolyte brushes in the osmotic regime; (ii) the system undergoes a spinodal decomposition during deposit at the air/water interface in the presence of DMF. Upon compression, the Q* position of the peak associated with the spinodal structure remains almost constant but its intensity evolves strongly and passes through a maximum at intermediate pressures. This reveals two operating processes in the system: strong electrostatic repulsions between chains that prevent in-plane reorganizations and force such reorganizations to occur from the surface to the volume and progressive expulsion of the DMF molecules from the monolayer. These processes have antagonist effects on the intensity of the peak: the increase of the repulsions makes it more pronounced, whereas the expulsion of solvent makes it vanish due to the loss of contrast. |
| 语种 | 英语 |
| 源URL | [http://119.78.100.183/handle/2S10ELR8/266811]  |
| 专题 | 中国科学院上海药物研究所 |
| 作者单位 | 1.Sorbonne Universités, UPMC Univ Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 place Jussieu, F-75005 Paris, France; 2.Laboratoire Léon Brillouin, CEA Saclay , 91191 Gif sur Yvette Cedex, France 3.Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI), ParisTech, PSL Research University, Sciences et Ingénierie de la Matière Molle (SIMM), CNRS UMR 7615, 10, Rue Vauquelin, F-75231 Cedex 05 Paris, France; 4.Synchrotron SOLEIL , L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France; |
| 推荐引用方式 GB/T 7714 | Guennouni, Zineb,Goldmann, Michel,Fauré, Marie-Claude,et al. Coupled Effects of Spreading Solvent Molecules and Electrostatic Repulsions on the Behavior of PS-b-PAA Monolayers at the Air-Water Interface[J]. Langmuir : the ACS journal of surfaces and colloids,2017,33(43):12525-12534. |
| APA | Guennouni, Zineb.,Goldmann, Michel.,Fauré, Marie-Claude.,Fontaine, Philippe.,Perrin, Patrick.,...&Cousin, Fabrice.(2017).Coupled Effects of Spreading Solvent Molecules and Electrostatic Repulsions on the Behavior of PS-b-PAA Monolayers at the Air-Water Interface.Langmuir : the ACS journal of surfaces and colloids,33(43),12525-12534. |
| MLA | Guennouni, Zineb,et al."Coupled Effects of Spreading Solvent Molecules and Electrostatic Repulsions on the Behavior of PS-b-PAA Monolayers at the Air-Water Interface".Langmuir : the ACS journal of surfaces and colloids 33.43(2017):12525-12534. |
入库方式： OAI收割
来源：上海药物研究所
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