Phase diagram of solvophilic nanodiscs in a polymer solution: Depletion attraction

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题名:	Phase diagram of solvophilic nanodiscs in a polymer solution: Depletion attraction
作者:	曹恆光;Hu, Ssu-Wei;Sheng, Yu-Jane;Tsao, Heng-Kwong
贡献者:	工學院化學工程與材料工程學系
关键词:	Addition polymerization;Agglomeration;aggregation behavior;Attraction;Chemistry;Clusters;Colloidal state and disperse state;Cross-disciplinary physics: materials science;rheology;Depletion;Dispersions;Exact sciences and technology;General and physical chemistry;Materials science;nanoparticles;Nanopowders;Nanoscale materials and structures: fabrication and characterization;nanospheres;Nanostructure;osmotic pressure;Phase separation;Physical and chemical studies. Granulometry. Electrokinetic phenomena;physical chemistry;physical phases;Physics;polymers;separation;surfactants
日期:	2013-04-18
上传时间:	2026-04-21 14:09:40 (UTC+8)
出版者:	American Chemical Society;Washington, DC: American Chemical Society
摘要:	摘要： Entropic attraction between anisotropic nanoparticles in nonadsorbing polymer solutions is significantly greater than that between nanospheres. In this study, depletion attraction between two solvophilic nanodiscs and the aggregation behavior of a nanodisc suspension are explored by dissipative particle dynamics. The depletion force due to polymer addition is proportional to the product of the osmotic pressure and the area of the nanodisc, even for concentrated polymer solutions. For a suspension of nanodiscs, three possible equilibrium states are observed upon polymer addition: dispersion, pretransition, and phase separation. By varying nanodisc concentration (φD) and polymer concentration (φP), the phase diagram is obtained. Dispersion exists for small φD and φP. As φD exceeds critical aggregation concentration, finite sized clusters are mainly formed with columnar structure in the pretransition regime, similar to micellization associated with typical surfactants. The mean size of columnar clusters seems to grow with φD 1/2 and φP. For high enough φD and φP, finite sized clusters vanish and phase separation appears. The nanodisc-rich phase is formed by a bundle of columns or a pack of columns owing to face-to-side and side-to-side depletion attractions. 其他題名： J. Phys. Chem. B 出版者： Washington, DC: American Chemical Society 出版日期： 2013-04-18 出處： The journal of physical chemistry. B, 2013-04, Vol.117 (15), p.4098-4108 資源來源： American Chemical Society Journals 版權： Copyright © 2013 American Chemical Society 版權： 2014 INIST-CNRS 識別號： ISSN: 1520-6106 識別號： ISSN: 1520-5207 識別號： EISSN: 1520-5207 識別號： DOI: 10.1021/jp311657q 識別號： PMID: 23521433
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