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Surface wave excitations and backflow effect over dense polymer brushes

Autor(en)
Sofia Biagi, Lorenzo Rovigatti, Francesco Sciortino, Chaouqi Misbah
Abstrakt

Polymer brushes are being increasingly used to tailor surface physicochemistry for diverse applications such as wetting, adhesion of biological objects, implantable devices and much more. Here we perform Dissipative Particle Dynamics simulations to study the behaviour of dense polymer brushes under flow in a slit-pore channel. We discover that the system displays flow inversion at the brush interface for several disconnected ranges of the imposed flow. We associate such phenomenon to collective polymer dynamics: a wave propagating on the brush surface. The relation between the wavelength, the amplitude and the propagation speed of the flow-generated wave is consistent with the solution of the Stokes equations when an imposed traveling wave is assumed as the boundary condition (the famous Taylor's swimmer).

Organisation(en)
Computergestützte Physik und Physik der Weichen Materie
Externe Organisation(en)
Centre National De La Recherche Scientifique (CNRS), Università degli Studi di Roma La Sapienza, Consiglio Nazionale delle Ricerche
Journal
Scientific Reports
Band
6
Anzahl der Seiten
6
ISSN
2045-2322
DOI
https://doi.org/10.1038/srep22257
Publikationsdatum
03-2016
Peer-reviewed
Ja
ÖFOS 2012
103015 Kondensierte Materie
Schlagwörter
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/b32eff50-ace1-4fa6-9c2a-97207b6629d6