Elastic Modulus of a Polymer Nanodroplet: Theory and Experiment
Published:Langmuir, Just Accepted Manuscript, DOI: 10.1021/la2049037 by Apostolos E.A.S. Evangelopoulos, Emmanouil Glynos, Frederic Madani-Grasset, and Vasileios Koutsos.
Abstract:We redevelop a theoretical model that, in conjunction with atomic force microscopy (AFM), can be used as a non-invasive method for the determination of the elastic modulus of a polymer nanodroplet residing on a flat, rigid substrate. The model is a continuum theory which combines surface and elasticity theories for the prediction of the dropletís elastic modulus, given experimental measurement of its adsorbed height. Utilization of AFM-measured heights for relevant droplets reported in the literature and from our own experiments illustrated the following: the significance of both surface and elasticity effects in determining a polymer dropletís spreading behaviour; the extent of a continuum theoryís validity as one approaches the nanoscale; a droplet size effect on the elastic modulus.
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