Precursor film in dynamic wetting, electrowetting, and electro-elasto-capillarity.
نویسندگان
چکیده
Dynamic wetting and electrowetting are explored using molecular dynamics simulations. The propagation of the precursor film (PF) is fast and obeys the power law with respect to time. Against the former studies, we find the PF is no slip and solidlike. As an important application of the PF, the electro-elasto-capillarity, which is a good candidate for drug delivery at the micro- or nanoscale, is simulated and realized for the first time. Our findings may be one of the answers to the Huh-Scriven paradox and expand our knowledge of dynamic wetting and electrowetting.
منابع مشابه
Capillary wave propagation during the delamination of graphene by the precursor films in electro-elasto-capillarity
Molecular dynamics simulations were carried out to explore the capillary wave propagation induced by the competition between one upper precursor film (PF) on the graphene and one lower PF on the substrate in electro-elasto-capillarity (EEC). During the wave propagation, the graphene was gradually delaminated from the substrate by the lower PF. The physics of the capillary wave was explored by t...
متن کاملElectrowetting-induced oil film entrapment and instability.
We investigate the spreading at variable rate of a water drop on a smooth hydrophobic substrate in an ambient oil bath driven by electrowetting. We find that a thin film of oil is entrapped under the drop. Its thickness is described by an extension of the Landau-Levich law of dip coating that includes the electrostatic pressure contribution. Once trapped, the thin film becomes unstable under th...
متن کاملElasto-capillarity: deforming an elastic structure with a liquid droplet.
Although negligible at macroscopic scales, capillary forces become dominant as the sub-millimetric scales of micro-electro-mechanical systems (MEMS) are considered. We review various situations, not limited to micro-technologies, where capillary forces are able to deform elastic structures. In particular, we define the different length scales that are relevant for 'elasto-capillary' problems. W...
متن کاملFrom Smartphones to Diagnostics: Low Cost Electronics for Programmable Digital Microfluidics and Sensing
We are developing all-electronic sensing and diagnostic platforms based on low-cost electronics as found in smartphones. Our concept is a system that combines digital microfluidics (DMF), based on Electro Wetting on Dielectric (EWOD) with direct electrical readout of assay chemistry using simple transistors. A programmable DMF technology has thousands of electrodes, each of which contains senso...
متن کاملThin Films in Partial Wetting: Internal Selection of Contact-Line Dynamics.
When a liquid touches a solid surface, it spreads to minimize the system's energy. The classic thin-film model describes the spreading as an interplay between gravity, capillarity, and viscous forces, but it cannot see an end to this process as it does not account for the nonhydrodynamic liquid-solid interactions. While these interactions are important only close to the contact line, where the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Physical review letters
دوره 104 24 شماره
صفحات -
تاریخ انتشار 2010