Shearing-induced contact pattern formation in hydrogels sliding in polymer solution

Shintaro Yashima , Satoshi Hirayama , Takayuki Kurokawa , Thomas Salez (1) , Haruna Takefuji , Wei Hong , Jian Ping Gong (2)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 Laboratory of Soft and Wet Matter Department of Biological Sciences

The contact of a hydrogel during the rotational shearing on glass surface in concentrated polymer solution was observed in situ. Dynamic contact patterns that rotate in-phase with the rotational shearing of the gel were observed for the first time. The contact patterns with a periodicity in the circumferential direction appeared and became fine with the shearing time. The patterns appeared more quickly at elevated sliding velocity, polymer concentration, and normal pressure. Furthermore, the softness of the gel also substantially influenced the character of the patterns. The pattern formation was discussed in terms of the non-linear rheology of the polymer solution at the rotational soft interface.

Domaines: Matière Molle [cond-mat.soft]; Génie chimique; Polymères; Mécanique des solides [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique statistique [cond-mat.stat-mech]; Science des matériaux [cond-mat.mtrl-sci]

Shintaro Yashima, Satoshi Hirayama, Takayuki Kurokawa, Thomas Salez, Haruna Takefuji, et al.. Shearing-induced contact pattern formation in hydrogels sliding in polymer solution. Soft Matter, 2019, 15, pp.1953. ⟨10.1039/c8sm02428f⟩. ⟨hal-01979782v3⟩