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

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• 作者：Da-peng Wang (12343) (22343)
  Mu-quan Yang (12343) (22343)
  Zhi-xin Dong (12343) (22343)
  Shu-qin Bo (12343)
  Xiang-ling Ji (12343)
  
• 关键词：Adsorption ; desorption ; Poly(ethylene glycol) ; Quartz crystal microbalance(QCM) ; Silica nanoparticles ; Atomic force microscopy(AFM)
• 刊名：Chemical Research in Chinese Universities
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：29
• 期：4
• 页码：820-824
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• 作者单位：Da-peng Wang (12343) (22343)
  Mu-quan Yang (12343) (22343)
  Zhi-xin Dong (12343) (22343)
  Shu-qin Bo (12343)
  Xiang-ling Ji (12343)
  
  12343. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China
  22343. Graduate University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
  
• ISSN：2210-3171

文摘

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.