Rolling and aging in temperature-ramp soft adhesion - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue Physical Review E Année : 2018

Rolling and aging in temperature-ramp soft adhesion

Résumé

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±1∘C, at which the PNIPAM polymer undergoes a transition, triggering attractive interaction between microparticles and surface. The adsorption rate, the effective in-plane (x−y) 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.
Fichier principal
Vignette du fichier
text_PRE_resub.pdf (651.4 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-01772809 , version 1 (20-04-2018)

Identifiants

Citer

Giuseppe Boniello, Christophe Tribet, Emmanuelle Marie, Vincent Croquette, Dražen Zanchi. Rolling and aging in temperature-ramp soft adhesion. Physical Review E , 2018, 97 (1), pp.012609. ⟨10.1103/PhysRevE.97.012609⟩. ⟨hal-01772809⟩
254 Consultations
112 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More