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Microfabrication of electronic and mechanical structure at the submillimeter scale is typically a time-consuming and expensive process. Lithographic techniques for silicon micromachining, used to fabricate integrated circuits and MEMS, take several weeks to go from drawings to completed chips, and require expensive facilities and extreme processing conditions. Therefore, for speeding up the fabrication...
In this paper, we demonstrate the first underwater use of a ‘universal jamming gripper’ to successfully grasp irregularly shaped objects. We present several novel developments which are required to extend this soft robotic technology to underwater operation including the use of pressure tolerant glass spheres and liquid water as the jamming media; an ‘under-filling’ technique to achieve effective...
in recent decades, DEP due to its high efficiency has been exploited widely in separation and manipulation of bioparticles. In the present work a simple, low-cost, and efficient procedure for fabrication of microfluidic chips applied in medicine and biochemistry has been presented. In this method, electrodes are not in direct contact with biological samples which results in elimination of conventional...
A kind of microfluidic chip based on dielectrophoresis (DEP) was designed for the purpose of trapping two particles with different sizes. In order to reach the purpose, the shape of electrode and the shape of the flow channel was designed, the electric field and the flow field of the chip was simulated. At last, the trajectory of the particles was obtained. The results show that the chip can complete...
Optically actuated bubbles in oil were used as microrobots. Simulations of the thermocapillary fluid flow within the oil phase are used to illustrate the mechanisms driving the bubble actuation. Parallel manipulation of sub-millimeter objects including glass beads and hydrogel beads was demonstrated. These capabilities show the potential for using the bubble microrobots in biomedical or other microassembly...
In this paper, the lattice Boltzmann method (LBM) is used for the direct numerical simulation of an inkjet-printed colloidal drop wetting on a patterned substrate. The single component multiphase (SCMP) model of Shan and Chen is used for the liquid-vapor multiphase flow and the particle suspension model is modified to incorporate adhesive forces between the suspended particle and the surrounding fluid...
We report development of a novel label-free continuous cell separation method for the extraction of rare cells from a limited amount of sample. The separation method is based on specific adhesion between target cells and antibody immobilized on oblique micro grooves etched into the channel wall. Due to asymmetric adhesive force, cross-flow displacement of the target cells is induced. Label-free lateral...
As the development of microelectronics is still driving towards further miniaturization, new materials, processes and technologies are crucial for the realization of future cost effective microsystems and components. Futures ICs and passives will also decrease in size, e.g. for RF-ID applications forecast die sizes are smaller than 250 ?m, thicknesses less than 50 ?m and pitches way below 100 ?m....
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