2 research outputs found
Experimental Investigation of the Self-Propelled Motion of a Sodium Oleate Tablet and Boat at an Oil–Water Interface
The self-propelled behaviors of macroscopic
inanimate objects at
surfaces and interfaces are ubiquitous phenomena of fundamental interest
in interface science. However, given the existence of a large variety
of systems with their own inherent chemical properties, the kinematics
of the self-propelled motion and the dynamics of the forces driving
these systems often remain largely unknown. Here, we experimentally
investigate the spontaneous motion of a sodium oleate tablet at a
water–nitrobenzene interface, under nonequilibrium and global
isothermal conditions, through measurements of the interfacial tension
with the noninvasive, quasi-elastic laser scattering method. The sodium
oleate tablet was self-propelled due to an imbalance in the interfacial
tension induced by the inhomogeneous adsorption of oleate/oleic acid
molecules. The kinetics of the self-propelled motion of a boat-shaped
plastic sheet bearing sodium oleate tablets at a sodium oleate aqueous
solution–nitrobenzene interface was also studied. The interfacial
tension difference between the front and rear of the boat was quantitatively
identified as the force pushing the boat forward, although the Marangoni
flow due to the uneven distribution of the interfacial tension behind
the boat tended to decelerate the motion
Experimental Investigation of the Self-Propelled Motion of a Sodium Oleate Tablet and Boat at an Oil–Water Interface
The self-propelled behaviors of macroscopic
inanimate objects at
surfaces and interfaces are ubiquitous phenomena of fundamental interest
in interface science. However, given the existence of a large variety
of systems with their own inherent chemical properties, the kinematics
of the self-propelled motion and the dynamics of the forces driving
these systems often remain largely unknown. Here, we experimentally
investigate the spontaneous motion of a sodium oleate tablet at a
water–nitrobenzene interface, under nonequilibrium and global
isothermal conditions, through measurements of the interfacial tension
with the noninvasive, quasi-elastic laser scattering method. The sodium
oleate tablet was self-propelled due to an imbalance in the interfacial
tension induced by the inhomogeneous adsorption of oleate/oleic acid
molecules. The kinetics of the self-propelled motion of a boat-shaped
plastic sheet bearing sodium oleate tablets at a sodium oleate aqueous
solution–nitrobenzene interface was also studied. The interfacial
tension difference between the front and rear of the boat was quantitatively
identified as the force pushing the boat forward, although the Marangoni
flow due to the uneven distribution of the interfacial tension behind
the boat tended to decelerate the motion