Elastic Modulus of a Polymer Nanodroplet: Theory and Experiment

Apostolos E. A. S. Evangelopoulos, Emmanouil Glynos, Frederic Madani-Grasset, Vasileios Koutsos

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We redevelop a theoretical model that, in conjunction with atomic force microscopy (AFM), can be used as a noninvasive method for determination of the elastic modulus of a polymer nanodroplet residing on a flat, rigid substrate. The model is a continuum theory that combines surface and elasticity theories for prediction of the droplet's 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 droplet's spreading behavior; the extent of a continuum theory's validity as one approaches the nanoscale; and a droplet size effect on the elastic modulus.

Original languageEnglish
Pages (from-to)4754-4767
Number of pages14
JournalLangmuir
Volume28
Issue number10
DOIs
Publication statusPublished - 13 Mar 2012

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