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

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Abstract

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.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China

    Da-peng Wang, Mu-quan Yang, Zhi-xin Dong, Shu-qin Bo & Xiang-ling Ji

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, P. R. China

    Da-peng Wang, Mu-quan Yang & Zhi-xin Dong

Authors
  1. Da-peng Wang
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  2. Mu-quan Yang
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  3. Zhi-xin Dong
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  4. Shu-qin Bo
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  5. Xiang-ling Ji
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Correspondence to Xiang-ling Ji.

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Supported by the National Natural Science Foundation of China(Nos.50621302, 50921062).

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Wang, Dp., Yang, Mq., Dong, Zx. et al. Adsorption-desorption of silica nanoparticles on poly(ethylene glycol) brushes grafted onto au substrate studied by quartz crystal microbalance. Chem. Res. Chin. Univ. 29, 820–824 (2013). https://doi.org/10.1007/s40242-013-2343-0

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  • DOI: https://doi.org/10.1007/s40242-013-2343-0

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