Proceedings

EPJE Topical Review: how capillarity drives the movement of small objects

Moving around small objects using capillary forces is a phenomenon that has stimulated scientists trying to understand the fundamental mechanisms at play. It is also important for many industrial, technological and analytical processes, for example micro-fluidics, oil and gas displacement, mineral flotation, miniature robot and biomechanics. In this EPJ E topical review article Jianlin Liu and Shanpeng Li present a critical review of capillarity-driven migration in which many examples are presented and explained. The small objects in question are non-deformable objects, such as particles, rods, disks and metal sheets as well as soft objects, such as droplets and bubbles. The authors clarify some misunderstandings on the conventional views on these systems.

Two types of interfaces are taken in consideration: the solid-fluid interface and the fluid-fluid interface. Due to the easily deformable properties of the soft objects and distorted interfacial shapes induced by small objects, a convenient way to obtain the driving force is through the potential energy of the system. The asymmetric factors causing the object migration include the asymmetric configuration of the interface, and the difference between the interfacial tensions. Finally, the author offer an outlook on the potential applications of small object migration.

They've been very patient regarding the many delays, inherent for a multi-author book, and they've been doing a great job, in a very short time. The book was really nice and all participants to the school were really happy to have a copy, though also accessible on the web site of EPJ Web of Conferences.

Dr. Béatrice Grenier, University Joseph Fourier, France
Co-editor EPJ Web of Conferences vol. 22, 2012

ISSN: 2100-014X (Electronic Edition)

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