A computer numerical control (CNC) apparatus was used to perform droplet centrifugation, droplet DNA extraction, and rapid droplet thermocycling on a single superhydrophobic surface and a multi-chambered PCB heater. Droplets were manipulated using "wire-guided" method (a pipette tip was used in this study). This methodology can be easily adapted to existing commercial robotic pipetting system, ...

Computational fluid dynamics is used to model atmospheric transport and droplet-thin film (surface) collisions in desorption electrospray ionization; experimentally obtained droplet properties are replicated in the simulations while a "droplet pick-up" mechanism of analyte transport is confirmed.

We consider the problem of an ideal polymer confined in a droplet. When the droplet radius is smaller than the (unconfined) polymer radius of gyration, the polymer entropy will depend on the droplet shape. We compute the resulting surface free

We present results of direct numerical simulation of heat transfer and droplet concentration in turbulent flow of a mixture of dry air, water vapor, and water droplets in a differentially heated channel. In particular, we study the effects of droplet collisions by comparing results of simulations with and without droplet collision model for several overall droplet volume fractions. The results ...

The static shape of droplets under electrowetting actuation is well understood. The steady-state shape of the droplet is obtained on the basis of the balance of surface tension and electrowetting forces, and the change in the apparent contact angle is well characterized by the Young-Lippmann equation. However, the transient droplet shape behavior when a voltage is suddenly applied across a drop...

Electrowetting (EW) involves the actuation of liquid droplets using electric fields and has been demonstrated as a powerful tool for initiating and controlling droplet-based microfluidic operations such as droplet transport, generation, splitting, merging and mixing. The heat transfer resulting from EWinduced droplet actuation has, however, remained largely unexplored owing to several challenge...

The transport of droplets in a pressure-atomized kerosene spray flame was examined using a twocomponent phase Doppler system to measure the droplet size and velocity distributions at several locations within the spray. The effect of combustion on droplet transport was examined by comparing the results to a nonburning spray under similar flow conditions. Directions of motion of droplets are calc...

This paper presents experimental results and analyses on the controlled manipulation of a liquid droplet. The droplet was manipulated upon local reduction and oxidation (redox) of dodecylbenzenesulfonate doped polypyrrole (PPy(DBS)) in an immiscible organic fluid of bulk dichloromethane (DCM, CH(2)Cl(2)). The electrochemically tunable wetting property of PPy(DBS) permitted liquid droplet manipu...

Generating chemical libraries in droplet form is vital to the adoption of microdroplet systems in high-throughput screening (HTS). This paper presents microfractionation in droplets (μFD), a method for generating heterogeneous droplet libraries using standard separation processes. In μFD, compounds eluting from a separation column are permanently encapsulated into droplets by a droplet generato...

We show that very low velocity droplets can be used to carry out an experiment to test whether condensate mediated transmission processes can occur in a superfluid droplet of He. By appropriately choosing the droplet radius and temperature, we can eliminate the competing roton, phonon, and ripplon mediated elastic transmission events. Then a calculation shows that if a few percent or more of th...