flow – TechConnect Briefs

Evanescent wave-based particle tracking technique for velocity distribution in extended nanochannel

Kazoe Y., Iseki K., Mawatari K., Kitamori T., The University of Tokyo, JP

We developed a flow measurement technique of velocity distribution in extended nanochannel (10- 1000 nm), using fluorescent tracer nanoparticles and the evanescent wave which penetrates into a liquid medium with an exponential decay from the [...]

Nanoparticle transport models in confined fluids

Mahadevan T.S., Kojic M., Milosevic M., Isailovic V., Filipovic N., Ferrari M., Ziemys A., The Methodist Hospital Research Institute, US

Mechanisms of nanoparticle (NP) and microparticle (MP) transport in confined spaces and role of material properties are not clearly understood, and transport models may not be complete. Here we present recently developed models of convective [...]

One-chip MOS Structure for Temperature Flow Sensor

Husak M., Boura A., Jakovenko J., Czech Technical University in Prague, CZ

There is presented a one-chip MOS structure of anemometric sensor system in the paper. The geometric arrangement of temperature sensors allows measurement of temperature gradient. Temperature gradient allows computation of direction of air flow over [...]

Quick “easy?!” determination of the diameter of nanocapillaries

Lutfurakhmanov A., Sailer R., Akhatov I., Schulz D.L., North Dakota State University, US

Precise measurements of the inner diameter (ID) of nanocapillaries are of interest to many areas of study due to the high sensitivity of gas and liquid flows with respect to the radius of the capillary. [...]

Liquid transport detection using single FET devices

Truman P., Uhlmann P., Stamm M., Institute of Polymer Research, DE

Observation and monitoring liquid transport and transport in liquids is a major task for lab on a chip applications and research. We use novel thin film FET devices based on silicon-on-insulator (SOI) substrates as planar [...]

Separation dynamics of binary liquid mixtures – Theory & Experiment

Truman P., Varnik F., Uhlmann P., Stamm M., Raabe D., Institute of Polymer Research, DE

We study how chemically patterned surfaces can be applied for the separation of two incompatible liquids and introduce a novel simplified separation scheme utilizing surfaces with an abrupt change of surface energy. Firstly we analyse [...]

Quantum Dots as Replacements for Tandem Dyes in Flow Cytometry

Buller G.M., Zhang Y.Z., Godfrey W.L., Invitrogen, US

Qdot® nanocrystals provide fluorescent labels that can be excited with UV or violet light sources, but can also be used with longer wavelength excitation. In flow cytometry, investigators achieve greater multiplexing of cellular markers by [...]

The Design of Temperature Matrix with Direction Sensitivity

Husak M., Jakovenko J., Kulha P., Janicek V., Czech Technical University in Prague, CZ

There has been designed a matrix of four temperature sensors on a chip. Each temperature sensor is composed of 9 NMOS transistors for increasing temperature sensitivity. The matrix is designed for anemometric measurement of velocity [...]

Inverted Method for Simulation of Electrokinetic Transport in Microchannel Devices

Nilson R.H., Griffiths S.K., Sandia National Laboratories, US

An inverted method of solution is used to numerically solve the equations governing electrokinetic fluid flow and species transport in microscale turns, junctions and curved channels. Rather than solving for the electric potential and fluid [...]

Electroosmotic Flow in a Tube or Channel for Non-Negligible Zeta Potentials

Griffiths S.K., Nilson R.H., Sandia National Laboratories, US

Numerical methods based on a shooting technique are employed to determine the electric potential and fluid velocity in a tube and channel when the zeta poten- tial is not small. In addition, new analytical solutions [...]