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

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.

Keywords

Adsorption-desorption / Poly(ethylene glycol) / Quartz crystal microbalance(QCM) / Silica nanoparticles; Atomic force microscopy(AFM)

References

[1] Milner S T. Science, 1991, 251(4996): 905.

[2] Rigoberto C, Advincula, Brittain W J, Caster K C, Rühe J. Polymer Brushes: Synthesis, Characterization, Applications, 2004, Hoboken: Wiley-Interscience.

[3] Zhao B. Prog. Polym. Sci., 2000, 25(5): 670.

[4] Li D, Sheng X, Zhao B. J. Am. Chem. Soc., 2005, 127(17): 6248.

[5] Tokareva I, Minko S, Fendler J H. Hutter E., J. Am. Chem. Soc., 2004, 126(49): 15950.

[6] Lee S. Perez-Luna V. H, Langmuir, 2007, 23(9): 5097.

[7] Sheeney-Haj-Ichia L, Sharabi G, Willner I. Adv. Func. Mater., 2002, 12(1): 27.

[8] Snaith H J, Sun B, Friend R H. Nano Lett., 2005, 59(9): 1653.

[9] Luzinov I, Minko S, Tsukruk V V. Soft Matter, 2008, 4: 714.

[10] Currie E P K, Norde W, Cohen Sturat M A. Adv. Colloid Interface Sci., 2003, 100: 205.

[11] Chen K, Ma Y Q. J. Phys. Chem. B, 2005, 1099(37): 17617.

[12] Gage R A, Cohen Stuart M A. Macromolecules, 2001, 34(15): 5078.

[13] Currie E P K, Sieval A B, Cohen Sturat M A. Langmuir, 1999, 15(21): 7116.

[14] Currie E P K, Cohen Stuart M A. Pure Appl. Chem., 1999, 71(7): 1227.

[15] Currie E P K, Fleer G J, Cohen Sturat M A. Langmuir, 2000, 16(22): 8324.

[16] Edvardsson M. Anal. Chem., 2009, 81(1): 349.

[17] Baba A, Kaneko F, Advincula R C. Colloids Surf., A, 2000, 173(1–3): 39.

[18] Rodahl M. Faraday Discussions, 1997, 107: 229.

[19] Dutta A K, Belfort G. Langmuir, 2007, 23(6): 3088.

[20] Bu X Y, Jiao L S, Han D X, Yang G F. Chem. Res. Chinese Universities, 2009, 25(4): 537.

[21] Liu G M, Yan L F, Zhang G Z. Polymer, 2006, 47(9): 3157.

[22] Poirier G E. Chem. Rev., 1997, 97(4): 1117.

[23] van der Beek G P, Cohen Stuart M A, Cosgrove T. Langmuir, 1991, 7(2): 327.

[24] Ostaci R V. Langmuir, 2008, 24(6): 2732.

[25] Sauerbrey G. Zeitschrift Für Physik, 1959, 155: 206.

[26] Dutta A K, Belfort G. J. Colloid Interface Sci., 2008, 324(1/2): 55.