John Martin Kolinski
Harvard University
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Publication
Featured researches published by John Martin Kolinski.
Physical Review Letters | 2012
John Martin Kolinski; Shmuel M. Rubinstein; Shreyas Mandre; Michael P. Brenner; David A. Weitz; L. Mahadevan
The commonly accepted description of drops impacting on a surface typically ignores the essential role of the air that is trapped between the impacting drop and the surface. Here we describe a new imaging modality that is sensitive to the behavior right at the surface. We show that a very thin film of air, only a few tens of nanometers thick, remains trapped between the falling drop and the surface as the drop spreads. The thin film of air serves to lubricate the drop enabling the fluid to skate on the air film laterally outward at surprisingly high velocities, consistent with theoretical predictions. Eventually this thin film of air breaks down as the fluid wets the surface via a spinodal-like mechanism. Our results show that the dynamics of impacting drops are much more complex than previously thought, with a rich array of unexpected phenomena that require rethinking classic paradigms.
EPL | 2014
John Martin Kolinski; L. Mahadevan; Shmuel M. Rubinstein
Drops are well known to rebound from superhydrophobic surfaces and from liquid surfaces. Here, we show that drops can also rebound from a superhydrophilic solid surface such as an atomically smooth mica sheet. However, the coefficient of restitution CR associated with this process is significantly lower than that associated with rebound from superhydrophobic surfaces. A direct imaging method allows us to characterize the dynamics of the deformation of the drop in entering the vicinity of the surface. We find that drop bouncing occurs without the drop ever touching the solid and there is a nanometer-scale film of air that separates the liquid and solid, suggesting that shear in the air film is the dominant source of dissipation during rebound. Furthermore, we see that any discrete nanometer-height defects on an otherwise hydrophilic surface, such as treated glass, completely inhibits the bouncing of the drop, causing the liquid to wet the surface. Our study adds a new facet to the dynamics of droplet impact by emphasizing that the thin film of air can play a role not just in the context of splashing but also bouncing, while highlighting the role of rare surface defects in inhibiting this response.
Physical Review Letters | 2009
John Martin Kolinski; Pascale Aussillous; L. Mahadevan
The motion of a ruck in a rug is used as an analogy to explain the role of dislocations in crystalline solids. We take literally one side of this analogy and study the shape and motion of a bump, wrinkle or ruck in a thin sheet in partial contact with a rough substrate in a gravitational field. Using a combination of experiments, scaling analysis and numerical solutions of the governing equations, we quantify the static shape of a ruck on a horizontal plane. When the plane is inclined, the ruck becomes asymmetric and moves by rolling only when the inclination of the plane reaches a critical angle, at a speed determined by a simple power balance. We find that the angle at which rolling starts is larger than the angle at which the ruck stops; i.e., static rolling friction is larger than dynamic rolling friction. We conclude with a generalization of our results to wrinkles in soft adherent extensible films.
Physical Review Letters | 2016
Hillel Aharoni; John Martin Kolinski; Michael Moshe; Idan Meirzada; Eran Sharon
Physical Review Letters | 2018
Itamar Kolvin; John Martin Kolinski; Jian Ping Gong; Jay Fineberg
Bulletin of the American Physical Society | 2018
Wassim Dhaouadi; François Gallaire; John Martin Kolinski
Physical Review Fluids | 2017
John Martin Kolinski; Hillel Aharoni; Jay Fineberg; Eran Sharon
Bulletin of the American Physical Society | 2015
Shmuel M. Rubinstein; John Martin Kolinski
Bulletin of the American Physical Society | 2015
John Martin Kolinski; Hillel Aharoni; Jay Fineberg; Eran Sharon
Archive | 2014
John Martin Kolinski; L. Ma; Shmuel M. Rubinstein