Contact
    Start Publications Adsorption-desorption of silica nanoparticles on poly(ethylene ...
    ←  Publication Finder
    QSense

    Adsorption-desorption of silica nanoparticles on poly(ethylene glycol) brushes grafted onto au substrate studied by quartz crystal microbalance

    Year: 2013

    Journal: Chemical Research in Chinese Universities August 2013, Volume 29, Issue 4, pp 820-824, 20140105

    Authors: Da-peng Wang 1 2, Mu-quan Yang 1 2, Zhi-xin Dong 1 2, Shu-qin Bo 1, Xiang-ling Ji 1

    Last authors: Xiang-ling Ji

    Organizations: 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China 2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Country: China

    The adsorption-desorption of silica nanoparticles(NPs) on poly(ethylene glycol)(PEG) grafted onto gold(Au) substrate was studied by quartz crystal microbalance with dissipation monitoring(QCM-D) technique. The results of frequency and dissipation show that SiO2 NPs can be adsorbed strongly on PEG-SH brushes at pH of 9.6, and a new dense and rigid construction is formed. Adjusting the pH from 9.6 to 12.3 resulted in the desorption of silica NPs from the PEG brushes because of a significant weakening of the hydrogen bond between the silica NPs and PEG chains. In addition, the viscoelastic properties of the system during the adsorption-desorption process were also analyzed via the relationship between the normalized frequency(Δf/n) and mass. And the corresponding atomic force microscopy(AFM) images also exhibit morphological changes during the above process, consistent with the changes in viscoelasticity.