The information of liquid film profile near a three-phase contact line is critical for a comprehensive understanding of various wetting and phase-change phenomena. We applied a state-of-the-art atomic force microscopy (AFM) under tapping mode (TM) to achieve a high-power scanning across the contact line. Within a scale of several to tens of microns, a highly linear film profile is observed near the contact line, based on which the contact angle is extracted.Read more

Fine particulate matter e.g. PM2.5 has become a serious threat to the public health. The traditional technologies either provide a low-removal efficiency of fine particles or are highly energy-consuming. We probe into the details of the particle behaviors, and develop a comprehensive numerical scheme which is applicable to industrial-scale simulation. New method to remove the particles at low cost is proposed based on the optimization of particle-particle and particle-wall collisions.Read more

Cryotherapy is a prospective green method for malignant tumor treatment. In clinical applications, the growth of ice ball must reach a suitable size as cells could not be all killed at the ice periphery.The mechanisms of cryoinjury around the ice periphery need thorough understanding. We studied a primary freeze-thaw control was carried out in a cell culture microchip. By controlling the cooling process in a microfluidic channel, it is possible to recreate a sketch of biological effect during the process of simulated cryosurgery.Read more