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Sharp, Teichroeb and Forrest [J.S. Sharp, J.H. Teichroeb, J.A.
Forrest, Eur. Phys. J. E 15, 473 (2004)] recently published a viscoelastic
contact mechanics analysis of the embedment of gold nanospheres into a
polystyrene (PS) surface. In the present comment, we investigate the
viscoelastic response of the surface and conclude that the embedment
experiments do not support the hypothesis of a liquid surface layer of
sufficiently reduced “rheological temperature” to explain reports of very
large reductions in the glass temperature of freely standing ultrathin
polystyrene films. We also report some errors and discrepancies in the paper
under comment that resulted in an inability to reproduce the reported
calculations. We present our findings of error in a spirit of clarifying the
problem of embedment of spheres into surfaces and in order that others can
understand why they may not reproduce the results reported by Sharp,
Teichroeb and Forrest. In the comment, we also examine the effects of the
magnitude of the forces that result from the polymer surface-nanosphere
particle interactions on the viscoelastic properties deduced from the
embedment data and we provide a comparison of apparent surface or
“rheological” temperature vs. experimental temperature that indicates
further work needs to be performed to fully understand the surface embedment
experiments. Finally, we comment that the nanosphere embedment measurements
have potential as a powerful tool to determine surface viscoelastic
properties. 相似文献
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Hutcheson SA McKenna GB 《The European physical journal. E, Soft matter》2007,22(4):281-6; discussion 287-91
Sharp, Teichroeb and Forrest [J.S. Sharp, J.H. Teichroeb, J.A. Forrest, Eur. Phys. J. E 15, 473 (2004)] recently published a viscoelastic contact mechanics analysis of the embedment of gold nanospheres into a polystyrene (PS) surface. In the present comment, we investigate the viscoelastic response of the surface and conclude that the embedment experiments do not support the hypothesis of a liquid surface layer of sufficiently reduced "rheological temperature" to explain reports of very large reductions in the glass temperature of freely standing ultrathin polystyrene films. We also report some errors and discrepancies in the paper under comment that resulted in an inability to reproduce the reported calculations. We present our findings of error in a spirit of clarifying the problem of embedment of spheres into surfaces and in order that others can understand why they may not reproduce the results reported by Sharp, Teichroeb and Forrest. In the comment, we also examine the effects of the magnitude of the forces that result from the polymer surface-nanosphere particle interactions on the viscoelastic properties deduced from the embedment data and we provide a comparison of apparent surface or "rheological" temperature vs. experimental temperature that indicates further work needs to be performed to fully understand the surface embedment experiments. Finally, we comment that the nanosphere embedment measurements have potential as a powerful tool to determine surface viscoelastic properties. 相似文献
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