Directional fluid motion driven by the surface property of solid substrate is highly desirable
for manipulating microfluidic liquid and collecting water from humid air. Studies on such …

A review of literature shows that the majority of papers cite a potentially incorrect form of the
Cassie and Cassie–Baxter equations to interpret or predict contact angle data. We show that …

The last two decades have witnessed an explosion of interest in the field of droplet-based
microfluidics for their multifarious applications. Despite rapid innovations in strategies to …

The power of the directional and spontaneous transport of liquid droplets is revealed
through ubiquitous biological processes and numerous practical applications, where …

Transporting water and oil microdroplets is important for applications ranging from water
harvesting to biomedical analysis but remains a great challenge. This is due to the amplified …

Using light to control liquid motion is a new paradigm for the actuation of microfluidic
systems. We review here the different principles and strategies to induce or control liquid …

A surface is said to be isotropic in wettability when the contact angles measured in all
direction are identical. On the contrary, once a surface shows distinct contact angles in …

Operations (driving, mixing, and handling) with small amounts of liquid usually rely on
complex architectures that involve active (pumps and valves) and passive (channels) …

This feature article describes the progress realized over the past half century in the field of
surface-bound gradient structures created on or from soft materials (oligomers and/or …

Most materials of practical interest are neither completely wetting nor completely non-
wetting.“Surface wettability” then refers to the degree that a surface is hydrophilic (ie water …