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Volumn 12, Issue 17, 1996, Pages 4224-4237

Interactions between poly(ethylene oxide) layers adsorbed to glass surfaces probed by using a modified atomic force microscope

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EID: 0000407069     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la960154l     Document Type: Article
Times cited : (113)

References (44)
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    • Klein, J. Nature 1980, 288, 248-249.
    • (1980) Nature , vol.288 , pp. 248-249
    • Klein, J.1
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    • Biggs, S. Langmuir 1995, 11, 156-162.
    • (1995) Langmuir , vol.11 , pp. 156-162
    • Biggs, S.1
  • 25
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    • Derjaguin, B. V. Kolloid-Z. 1934, 69, 155-164. Hunter, R. J. Foundations of Colloid Science; Clarendon Press, 1991; Vol. 1.
    • (1934) Kolloid-Z. , vol.69 , pp. 155-164
    • Derjaguin, B.V.1
  • 28
    • 5244237874 scopus 로고    scopus 로고
    • note
    • Although the mass of glue used must be considered, it is clear from experiment that its influence on the resonance is considerably less than the resolution of the equipment. We estimate that with our current setup we can easily detect changes due to particle radii of 10 μm or less and that our derived values are accurate to better than 10%•
  • 29
    • 5244289521 scopus 로고    scopus 로고
    • note
    • In some cases the polymer solution itself was filtered after the standing time through a 0.22 μm Millipore GS filter. Little difference was noted between filtered and unfiltered solutions, and for this reason later experiments were not generally performed with filtered solutions.
  • 30
    • 85088543080 scopus 로고    scopus 로고
    • note
    • 30 specifically the lever and surrounding fluid. There must therefore be a period to reduce thermal drift after the laser was switched on (>30 min) before any data are collected.
  • 32
    • 5244221547 scopus 로고    scopus 로고
    • note
    • Although this may allow the layer to rearrange, it was felt that since adsorption must have stopped, this would be insignificant when compared to the errors due to the apparatus not having stabilized properly.
  • 36
    • 85088543330 scopus 로고    scopus 로고
    • note
    • -1 rates) but are rarely used in this way.
  • 37
    • 5244354426 scopus 로고    scopus 로고
    • note
    • It is extremely hard to obtain a van der Waals plot (where a clear attraction is seen at short ranges) on glass for a number of reasons. A rougher surface (see Figure 2) is less likely to exhibit a strong van der Waals interaction because, the effective contact area is reduced, therefore a jump-in is unlikely. Also, not only is glass known to adsorb salts from solution quite strongly, but it also forms a "hydration layer" of adsorbed water molecules. These effects will result in a layer of adsorbates on the surfaces which will screen the attractive potential.


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