Shape-dependent orientation of thermophoretic forces in microsystems

Direct measurement of thermophoretic forces.

We study the thermophoretic motion of a micron sized single colloidal particle in front of a flat wall by evanescent light scattering. To quantify thermophoretic effects we analyse the nonequilibrium steady state (NESS) of the particle in a constant temperature gradient perpendicular to the confining walls. We propose to determine thermophoretic forces from a "generalized potential" associated ...

Thermophoretic and ponderomotive forces in a linear cluster of particles.

We investigate amplification of thermophoretic and ponderomotive forces caused by renormalization of static fields in linear clusters of particles with scale separation. We found analytically the dependence of the forces acting on the particles in a cluster as a function of the number of particles in a cluster and material characteristics of the particles and the surrounding fluid. We analytica...

Magnetic forces produced by rectangular permanent magnets in static microsystems.

Finite element numerical simulations were carried out in 2D geometries to map the magnetic field and force distribution produced by rectangular permanent magnets as a function of their size and position with respect to a microchannel. A single magnet, two magnets placed in attraction and in repulsion have been considered. The goal of this work is to show where magnetic beads are preferentially ...

Pinker Orientation - Dependent Mechanisms in Shape Recognition : Further Issues

Sequential shape-and-solder-directed self-assembly of functional microsystems.

We demonstrate the fabrication of packaged microsystems that contain active semiconductor devices and passive components by using a directed self-assembly technique. The directed self-assembly is accomplished by combining geometrical shape recognition with site-specific binding involving liquid solder. Microfabricated components with matching complementary shapes, circuits, and liquid solder-co...