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Nanoparticles are difficult to remove because it is much more difficult to deliver the necessary force to smaller dimensions. We investigate in this paper a new method using micro-droplet spray to remove nanoparticles from solid flat surface. With a droplet diameter between 50 and 100 mum, we evaluate the lift force and drag force acting on spherical particles. The particle diameter is less than 100...
In this paper, we present a three-dimensional dissipative particle dynamics simulation, which is independent of the initial conditions, for analyzing the wettability on liquid-solid interfaces. The model parameters are constructed based on simulation optimization. The contact angle of a droplet on the solid platforms which possess different surface energy is simulated. The normalized factors indicate...
The formation of micro-scale droplets in liquids is crucial in the emulsification process, which is commonly used for a variety of industrial applications. This paper reports a new microfluidic chip capable of generating uniform micro-droplets in liquids for emulsification applications. The microfluidic chip can generate uniform micro-droplets utilizing a novel combination of hydrodynamic focusing...
The reduction in dimensions of biochip arrays is of interest only if the size of the spots containing DNA or proteins is kept uniform. This condition is necessary to properly compare fluorescence signals from the different spots and thus to validate the results. Toward this aim, we propose a fully automated MEMS-based spotter enabling the spatial positioning of the depositing cantilever array and...
This paper presents the fabrication of a micro droplet ejector for the application of digital printing system. The ejector makes the ink droplets of approximately 80 squaremum diameter on demand. The ejecting system is the type of face-shooter. The method of actuating membrane is bending mode using d31 of PZT. The size of ejector is 27.6 mm x 27.75 mm x 1.1 mm, and the pitch between nozzles is 2.54...
Using phase change of working fluid to remove heat in a heat exchanger device is a high efficiency method. When superheated vapor passes over a sub-cooled substrate, water droplets nucleate and grow by coalescence with the surrounding drops. The merging droplets exhibit two-dimensional random motion somewhat like the Brownian movements of colloidal particles. If surface energy patterns are designed...
This paper presents an experimental investigation of a micro dripping mode of electrostatic droplet ejection for the liquid solvents, such as DI water, acetone, dioxane, dioxane+ DI water (10% ,25% ,50% ,66.7%), of different physical properties. Emphasis is given to how the electrical conductivities of liquid solvents affect the stability of a micro dripping mode of drop-on-demand droplet ejection...
This paper present a novel electrostatic drop-on-demand micro jetting device featured by a MEMS fabricated nozzle with a conductive pole inside, referred to here as a pole type nozzle. The electric voltage signal applied to the ring shaped upper electrode plate, against the pole as the ground, allows a micro-dripping ejection of droplet to take place: That is, a tiny droplet is taken away from the...
Electrowetting-on-dielectric (EWOD) is a promising method for manipulating tiny amounts of liquids. However, the miniaturization and the monolithic integration become the great challenges to improve the EWOD applications in actual lab-on-a-chip systems. In this paper, we present an IC-compatible digital microfluidic actuator, which uses silicon as the substrate and the thermally grown SiO2 film on...
A hybrid design optimization tool combining one dimensional lumped parameter model and three dimensional computational fluid dynamics (CFD) approach has been developed and applied to industrial inkjet head design for the application of direct writing on printed circuit boards (PCB). Time sequence of droplet formation is verified by the comparison with photographic images acquired by stroboscopic technique...
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