Rolling and aging in temperature-ramp soft adhesion

Giuseppe Boniello, Christophe Tribet, Emmanuelle Marie, Vincent Croquette, and Dražen Zanchi
Phys. Rev. E 97, 012609 – Published 17 January 2018

Abstract

Immediately before adsorption to a horizontal substrate, sinking polymer-coated colloids can undergo a complex sequence of landing, jumping, crawling, and rolling events. Using video tracking, we studied the soft adhesion to a horizontal flat plate of micron-size colloids coated by a controlled molar fraction f of the poly(lysine)-grafted-poly(N-isopropylacrylamide) (PLL-g-PNIPAM) which is a temperature-sensitive polymer. We ramp the temperature from below to above Tc=32±1C, at which the PNIPAM polymer undergoes a transition, triggering attractive interaction between microparticles and surface. The adsorption rate, the effective in-plane (xy) diffusion constant, and the average residence time distribution over z were extracted from the Brownian motion records during last seconds before immobilization. Experimental data are understood within a rate-equations-based model that includes aging effects and includes three populations: the untethered, the rolling, and the arrested colloids. We show that preadsorption dynamics casts a characteristic scaling function α(f) proportional to the number of available PNIPAM patches met by soft contact during Brownian rolling. In particular, the increase of in-plane diffusivity with increasing f is understood: The stickiest particles have the shortest rolling regime prior to arrest, so that their motion is dominated by the untethered phase.

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  • Received 3 September 2017

DOI:https://doi.org/10.1103/PhysRevE.97.012609

©2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Polymers & Soft Matter

Authors & Affiliations

Giuseppe Boniello1, Christophe Tribet1, Emmanuelle Marie1, Vincent Croquette2, and Dražen Zanchi1,3,*

  • 1École Normale Supérieure, Département de Chimie, UMR CNRS-ENS-UPMC 8640 PASTEUR, 24, rue Lhomond, F-75005 Paris, France
  • 2École Normale Supérieure, Département de Physique and Département de Biologie, Laboratoire de Physique Statistique UMR CNRS-ENS 8550, 24, rue Lhomond, F-75005 Paris, France
  • 3Université de Paris 7 Denis Diderot, 5 rue Thomas Mann, 75013 Paris, France

  • *zanchi@ens.fr

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Vol. 97, Iss. 1 — January 2018

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