A simple technique to achieve meniscus-free interfaces

Abstract

Liquid wetting on a container wall forms a meniscus that causes the reading uncertainty of interface measurement, which was considered as an “inevitable” interference in experiments. For minimizing the meniscus interference, the dynamic instead of the static contact angle should be focused on and θr ≤ 90° ± ε ≤ θa is the guideline to achieve a meniscus-free interface for a practical experiment, where θr, θa, and ε are the receding and advancing contact angles, and image measuring uncertainty, respectively. A simple and systematic technique to achieve the meniscus-free interface has been proposed and visualized.

Emergence of Ring‐Shaped Microstructures in Restricted Geometries Containing Self‐Propelled, Catalytic Janus Spheres

“…[38] We note that D, the inner diameter of the cylindrical tube confining the droplet, is sufficiently large so that the curvature of the meniscus is negligible, and thus very little evaporation-induced convective flow is present during the drying process. Heuristically, the flatness of the meniscus results in uniform evaporation, [39] which in turn leads to a distribution of dried particles that is congruently evenly dispersed. We do not expect that low concentrations of H 2 O 2 will result in significant changes in the spatially homogeneous evaporation.…”