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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Geng, Yuanyuan Liu, Hong-Guo Hao, Jingcheng Xu, Yuan Hong, Ming Lee, Yong-Ill Liu, Mei |
| Description | Author Affiliation: Hong M ( Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.); Geng Y ( Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.); Liu M ( Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.); Xu Y ( School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.); Lee YI ( Anastro Laboratory, Department of Chemistry, Changwon National University, Changwon 641-773, Republic of Korea.); Hao J ( Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.); Liu HG ( Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China. Electronic address: hgliu@sdu.edu.cn.) |
| Abstract | An emulsion-directed assembly and adsorption approach has been used to fabricate composite films of polystyrene-b-poly(acryl acid)-b-polystyrene (PS-b-PAA-b-PS) and Eu(3+) and La(3+) ions at the planar liquid/liquid interface of the polymer DMF/chloroform (1:1, v/v) mixed solution (lower phase) and aqueous solutions of the corresponding salts (upper phase). The lower phase gradually transformed to a water-in-oil (W/O) emulsion via spontaneous emulsification due to the 'ouzo effect'. Polymer molecules and the metal ions assembled around emulsion droplets that adsorbed at the planar liquid/liquid interface at last, resulting in formation of composite films. The film morphologies and structures depend on Ln(3+) ions: polymer/Eu(3+) composite films were foam films composed of microcapsules ranging in size from several hundreds of nanometers to micrometers, while polymer/La(3+) composite films were composed of hollow spheres several tens of nanometers in size. Fourier transform infrared (FTIR) spectra revealed that the coordination modes of carboxyl groups to Eu(3+) and La(3+) were bridging bidentate and ionic, respectively, in the two types of composites. These results indicate that stable microcapsules can be fabricated around droplets for polymer/Eu(3+) systems, while microcapsules of polymer/La(3+) are unstable. This leads to different film morphologies and structures. Compositions of these films were characterized using energy-dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). In addition, foam films of polymer/Eu(3+)/2,2'-bipyridine (bpy) were fabricated using this approach, and their photoluminescence properties were investigated. |
| ISSN | 00219797 |
| Journal | Journal of Colloid and Interface Science |
| Volume Number | 438 |
| e-ISSN | 10957103 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-01-15 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Colloid & Interface Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Colloid and Surface Chemistry Biomaterials Electronic, Optical and Magnetic Materials |
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