Kinetics of Nanoparticle Reassembly Mediated by UV-Photolysis of Surfactant

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• 作者：Peter Siffalovic ; Livia Chitu ; Eva Majkova ; Karol Vegso ; Matej Jergel ; Stefan Luby ; Ignac Capek ; Alexander Satka ; Guenther A. Maier ; Jozef Keckes ; Andreas Timmann ; Stephan V. Roth
• 刊名：Langmuir
• 出版年：2010
• 出版时间：April 20, 2010
• 年：2010
• 卷：26
• 期：8
• 页码：5451-5455
• 全文大小：928K
• 年卷期：v.26,no.8(April 20, 2010)
• ISSN：1520-5827

文摘

Real-time reassembly of an ordered nanoparticle monolayer due to UV-photolysis of the surfactant shell of nanoparticles was observed. The technique of grazing-incidence small-angle X-ray scattering provided the possibility to track in situ the nanoparticle pair correlation function of the sample processed in a UV-ozone reactor. The analysis revealed a total shift of 1 nm of the nanoparticle nearest-neighbor distance. The temporal evolution of the interparticle distance proved to be the first-order process governed by the UV-photolysis and described by a single-exponential decay function. The nanoparticles tend to agglomerate into a labyrinth-like structure with a typical length scale of some 30 nm.