Stimuli-Responsive Magnetite Nanoparticle Monolayers

详细信息    查看全文

• 作者：Cristina Stefaniu ; Munish Chanana ; Dayang Wang ; Gerald Brezesinski ; Helmuth Mo虉hwald
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：April 7, 2011
• 年：2011
• 卷：115
• 期：13
• 页码：5478-5484
• 全文大小：925K
• 年卷期：v.115,no.13(April 7, 2011)
• ISSN：1932-7455

文摘

The stimuli-responsive behavior of copolymer-capped NPs (Fe₃O₄@MEO₂MA₉₀-co-OEGMA₁₀ and Fe₃O₄@MEO₂MA) was studied in the temperature interval between 6 and 43 掳C at the air/water interface, and at 20 and 37 掳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).