This paper presents systematic investigation on the surface properties of electroosmotic flows (EOF) inside microchannels for quartz, glass and PDMS based materials. Two novel methods to modify the surface properties of glass-based microchannels for capillary electrophoresis (CE) are developed. Instead of using complicated and time-consuming chemical silanization procedures for surface modifica...

When the marvels of modern biological research are presented in the media, one image almost always appears: a person in a laboratory using a micropipette. This small but ubiquitous device has evolved into one of the icons of modern biotechnology, molecular biology, gene therapy, stem-cell technology and cloning. The modern micropipette has achieved such high visibility for obvious reasons: it i...

Independent control of electroosmosis is important for separation science techniques such as capillary zone electrophoresis and for the movement of fluids on microdevices. A capillary electrophoresis microdevice is demonstrated which provides more efficient control of electroosmosis with an applied external voltage field. The device is fabricated in a glass substrate where a 5.0 cm separation c...

The measurement of small amounts of liquids is very important in fields like, health, chemistry, microbiology and genetics. The most common used instruments for delivery of liquids, in the order of the microliter, are micropipettes or piston pipettes, of fixed or variable volume, with positive or air displacement operation. The method used in the calibration of micropipettes is the gravimetric ...

We have studied the formation of Pd42.5Cu30Ni7.5P20 metallic glass droplets and wires in the gas atomization process. We demonstrate that the sizes of droplets and wires can be distinguished by the Ohnesorge number (Oh), which is the proportion of the spinnability to the capillary instability, and the diameter distributions follow a log-normal distribution function, implying cascade fragmentati...

The Derjaguin-Broekhoff-de Boer theory of capillary condensation is employed to describe deformation of mesoporous solids in the course of adsorption-desorption hysteretic cycles. We suggest a thermodynamic model, which relates the mechanical stress induced by the adsorbed phase to the adsorption isotherm. Analytical expressions are derived for the dependence of the solvation pressure on the va...