A5057204988- Surface Modification and Superhydrophobicity
- Fluid Dynamics and Heat Transfer
- Nanomaterials and Printing Technologies
- Adhesion, Friction, and Surface Interactions
- Pickering emulsions and particle stabilization
- Electrowetting and Microfluidic Technologies
- Advanced Sensor and Energy Harvesting Materials
- Electrohydrodynamics and Fluid Dynamics
- Micro and Nano Robotics
- Diamond and Carbon-based Materials Research
- Modular Robots and Swarm Intelligence
- Fluid Dynamics and Thin Films
University of Waterloo
2023-2024
Indian Institute of Technology Patna
2017-2021
Indian Institute of Technology Kanpur
2015
Abstract Magnetic manipulation of droplets has emerged as a promising strategy to achieve several complex tasks ranging from targeted drug delivery and micro‐robotics controlled chemical synthesis. Hence, proper control in creating magnetically responsive is indispensable for successful implementation. Here, an impact‐based encapsulation technique employed create stable ferrofluid‐wrapped single‐liquid compound inside water bath. Thereafter, permanent magnet used manipulate the resulting...
The cloaking of the droplet and solid spheres by a thin ferrofluid layer forms ferrofluid-wetting ridge, enabling magnet-assisted directional manipulation droplets on magneto-responsive slippery surface. Understanding interplay various forces governing motion unravels mechanism. transportation characteristics such surfaces enable their controlled in multiple applications. Here, we prepare using superhydrophobic coatings glass slides, creating porous network impregnating them with ferrofluid....
It has been recently shown that small-volume droplets on lubricant-infused surfaces (LISs) can be analytically modeled using rotationally symmetric constant mean curvature (CMC) surfaces. While such an approach is available for noncloaked droplets, a similar missing cloaked are ubiquitous in number of LIS-related applications. The presence thin cloaking film the top spherical cap portion and its gradual transition to bulk meniscus remain unaddressed implications interfacial profile droplets....
The spatiotemporal evolution of an evaporating sessile droplet and its effect on lifetime is crucial to various disciplines science technology. Although experimental investigations suggest three distinct modes through which a evaporates, namely, the constant contact radius (CCR), angle (CCA), mixed, only CCR CCA have been modeled reasonably. Here we use experiments with water droplets flat micropillared silicon substrates characterize mixed mode. We visualize that perfect mode after initial...
Superior mobility of droplets on lubricant-infused surfaces (LIS) has recently attracted significant attention for designing liquid-repellent surfaces. Unlike sessile flat wherein the contact line is easily visible in experiments, LIS masked by lubricant meniscus, and special imaging techniques are required to visualize hidden droplet-lubricant interface. Moreover, overall shape deviates significantly from spherical cap geometry even at very low droplet volumes. These difficulties...
We show that it is fundamentally inaccurate to apply force-balance models predict the gravity/buoyancy induced detachment of quasi-steadily growing pendant droplets/bubbles. solve governing Young–Laplace (Y–L) equation clarify all forces acting on a droplet/bubble always sum up zero, even prior or beyond well-accepted critical volume detachment. Accordingly, typical force balance reported in literature do not hold any physical justification and are merely curve fit experimental trends....
A numerical and experimental study has been carried out with a pair of water drops coalescing over superhydrophobic surface. Initially, stationary isolated drop (of given radius R) in the sessile configuration is just touched by another R2), vertically line it, at zero speed. The solid substrate chemically treated, polished surface made up copper, for which equilibrium contact angle was measured to be 150°. Bond number, considering total volume combined drop, falls range 0.3−0.5. For these...
A sticky hydrophobic surface has prospective applications in microfluidic chips, no loss microdroplet transportation, biochemical detection and separation, quantitative transportation biochips, chemical microreactors, among others. Here we report fabrication characterization of a novel parahydrophobic cerium oxide (CeO2) coating using facile industrially viable plasma spray technique. Our displays significantly high water contact angle (WCA=159.02˚) along with hysteresis (CAH≥90˚), very much...