Stimuli-Responsive Magnetite Nanoparticle Monolayers

被引：17
|
作者：
Stefaniu, Cristina [1 ]
Chanana, Munish [1 ]
Wang, Dayang [1 ,2 ]
Brezesinski, Gerald [1 ]
Moehwald, Helmuth [1 ]
机构：
[1] Max Planck Inst Colloids & Interfaces, D-14476 Potsdam, Germany
[2] Univ S Australia, Ian Wark Res Inst, Adelaide, SA 5095, Australia
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 13期
关键词：
AIR-WATER-INTERFACE; AIR/WATER INTERFACE; POLY(ETHYLENE OXIDE); DIBLOCK COPOLYMER; AQUEOUS-SOLUTION; TEMPERATURE; SURFACE; MICELLIZATION; TRANSITIONS; MICELLAR;
D O I：
10.1021/jp111374f
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The stimuli-responsive behavior of copolymer-capped NPs (Fe3O4@MEO(2)MA(90)-co-OEGMA(10) and Fe3O4@MEO(2)MA) was studied in the temperature interval between 6 and 43 degrees C at the air/water interface, and at 20 and 37 degrees C on the surface of 150 mM NaCl, 1 M NaCl, and 2% citric acid aqueous solutions. The critical surface pressure of the NP layers and the exchange of the NPs between the interface and the subphase respond clearly to temperature and ionic strength changes of the aqueous subphase. The comparative study of the two NP systems allowed the determination of the influence of the oligo(ethylene glycol) methacrylate (OEGMA) moiety on the stimuli-responsive interfacial behavior. The conformational change of the copolymer seems to dictate the interfacial behavior of the copolymer-capped NPs below and above their characteristic LCST (lower critical solution temperature).
引用
收藏
页码：5478 / 5484
页数：7
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