Size-Dependent Submerging of Nanoparticles in Polymer
Melts: Effect of Line Tension
Posted on 2018-03-16 - 19:41
Adhesion of nanoparticles
to polymer films plays a key role in
various polymer technologies. Here we report experiments that reveal
how silica nanoparticles adhere to a viscoelastic PMMA film above
the glass transition temperature. The polymer was swollen with CO2, closely matching the conditions of nanoparticle-nucleated
polymer foaming. It is found that the degree by which the particles
sink into the viscoelastic substrate is strongly size dependent and
can even lead to complete engulfment for particles of diameter below
12 nm. These findings are explained quantitatively by a thermodynamic
analysis, combining elasticity, capillary adhesion, and line tension.
We argue that line tension, here proposed for the first time in elastic
media, is responsible for the nanoparticle engulfment.
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Liu, Shanqiu; Pandey, Anupam; Duvigneau, Joost; Vancso, Julius; Snoeijer, Jacco H. (2018). Size-Dependent Submerging of Nanoparticles in Polymer
Melts: Effect of Line Tension. ACS Publications. Collection. https://doi.org/10.1021/acs.macromol.7b02353
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AUTHORS (5)
SL
Shanqiu Liu
AP
Anupam Pandey
JD
Joost Duvigneau
JV
Julius Vancso
JS
Jacco H. Snoeijer