This study confirmed through experimental and theoretical investigations that considering the influences of neighboring wall on particle motion due to intermolecular, electrostatic, hydrodynamic interactions is crucial when studying microparticles’ under evanescent-field radiation pressure. The velocity polystyrene microparticles parallel interface was measured in evanescent field generated at a glass–solution interface. estimated force increased with laser power, decreased rapidly as...

Silica glass is frequently used as a device material for micro/nano fluidic devices due to its excellent properties, such transparency and chemical resistance. Wet etching by hydrofluoric acid dry neutral loop discharge (NLD) plasma are currently micromachine form channels. Electro-osmotic flow (EOF) one of the most effective methods drive liquids into EOF mobility affected property micromachined surfaces, which includes surface roughness that determined manufacturing processes. In this...

The present study proposes a non-intrusive visualization technique based on two-wavelength Raman imaging for in-situ monitoring of the unsteady temperature field in microfluidic systems. measurement principle relies contrasting dependencies hydrogen-bonded and non-hydrogen-bonded OH stretching modes water band, whose intensities were simultaneously captured by two cameras equipped with corresponding bandpass filters. distributions then determined from intensity ratio simultaneously-obtained...

The motion and concentration distribution of particles cells in flow are important factors which affect the fluid properties, structure, mass transfer biological chemical species blood vessels channels. In this study, number density distributions rigidized red (RBCs) a microchannel whose size is comparable to sizes particle RBCs measured. Measurements were conducted at several streamwise locations for suspensions with hematocrits order 10% 5 8 µm. Analysis migration resulting was using model...

Grease is used as a lubricant in wide range of fields, including bearings, because it reduces friction, prevents harmful wear components, protects against rust and corrosion, acts seal to prevent the invasion dirt water. Although most research on grease has focused environment inside bearing, there been little fundamental lubrication mechanism grease. It known that thickeners, which keep complex three-dimensional structure grease, have significant effect shear characteristics assumed this...

We developed a technique which can increase the yield of one-to-one particle encapsulation by applying dielectrophoretic alignment using boxcar-type electrodes. Dielectrophoretic force generated electrodes accelerate and decelerate particles periodically as they flow in electrode region. Further, is turned on off at constant frequency. The exerted over space time align them streamwise direction with even interval. In this study, were installed microchannel region upstream flow-focusing...

We have developed a technique which can control the particle interval (spacing), velocity and timing in microchannel flow by exerting dielectrophoretic (DEP) force on particles periodically over time space using boxcar electrode. Controlling of to align with even improve performance sensor, sorter, encapsulation system for cells microfluidic devices. One concerns about this is whether we when several are located same periodic area. In present study, conducted numerical simulations...

The present study proposes a velocity measurement based on thermal tracing by Raman imaging and investigates its applicability focusing the error in temperature measurement, towards establishment of non-intrusive micro-scale velocimetry. In order to realize fluorescence-free two-wavelength was employed measure field channel flow. This technique exploits contrasting dependencies hydrogen-bonded (HB) non-hydrogen-bonded (NHB) OH stretching bands liquid water, enables determination planar...

Coherent anti-Stokes Raman scattering (CARS) microscope system was built and applied to a non-intrusive gas concentration measurement of mixing flow in millimeter-scale channel. Carbon dioxide nitrogen were chosen as test fluids CARS signals from the generated by adjusting wavelengths Pump Stokes beams. The signals, whose are different those beams, captured an EM-CCD camera after filtering out excitation A calibration experiment performed order confirm applicability built-up measuring...

A fluid temperature measurement technique based on fluorescence polarization is developed and applied to measure the two-dimensional distributions in microchannel. In this method, depolarization due rotational Brownian motion of fluorescent molecules solution measured converted temperature. Since degree independent intensity, less influenced by quenching effect, which an issue laser-induced (LIF) method. Experiments were performed using a microchannel with solved water. The effects molecule...

Pseudomorphic In0.25Ga0.75As/Al0.32Ga0.68As quantum wells (QWs) with well widths (Lw) of 13, 15, 17, 19, 21, and 23 nm were grown simultaneously on the (411)A (100) GaAs substrates at 480 °C by molecular beam epitaxy. The critical thickness an InGaAs QW layer in was determined photoluminescence (PL) measurements 11 K to be approximately 20 nm, i.e., significant increase full width half maximum PL peaks observed for Lw⩾20 QWs. This is more than 60% larger that (around 12 nm)

The authors are aiming at controlling actively the heat transfer performance in low Reynolds number flow with photo-rheological fluids (PRFs) whose rheological properties can be tuned by UV irradiation. We examine structures of UV-irradiated and non-irradiated PRFs a serpentine channel PIV, investigate correlation between behaviors rate. As result experiment, PRF becomes almost symmetric to center steady, while has distortion unsteadiness. This may lead change characteristics.

This study describes a non-intrusive measurement of the distribution CO_2 and N_2 concentrations in gas mixture flow by coherent anti-Stokes Raman scattering (CARS) microscopy for development technique microscale flow. The relationship between CO_2/N_2 ratio CARS intensity generated from was acquired. Concentrations both gases were measured at ten different points channel where mixed. maximum standard deviations data 3.90% 5.58%, respectively. It shown that region (2.5 x 2.5 44.5 μm^3) realized.

In this research, non-intrusive imaging of concentration distribution was performed in the vicinity a microchannel wall using total internal reflection Raman scattering excited by evanescent wave. The spectra H_2O and D_2O are different due to O-H bond O-D bond. near-wall H2_O were calculated from intensities obtained mixing flow field T-shaped microchannel. distributions successfully acquired at various rates applying calibration curves which represent relationships between concentrations...

A non-intrusive concentration measurement technique was developed to investigate the ion motion in mixed electrolyte solutions using coherent anti-Stokes Raman Scattering (CARS) microscopy. With this technique, several information of chemical specificity molecular can be obtained from vibrations with high sensitivity. In paper, experiments were conducted ammonium chloride and sodium sulfate solution, whose characteristic signal observed at 3400 cm^<-1> 982 cm^<-1>, respectively. order obtain...

We have investigated lateral uniformity of pseudomorphic In0.05Ga0.95As/Al0.3Ga0.7As quantum wells (QWs) with well widths Lw 2.4 and 3.6 nm grown on a (411)A InxGa1−xAs ternary substrate by molecular beam epitaxy. The variation In content (x) is from 0.054 to 0.063 over an area 4 mm2 in this substrate. spite the x InGaAs (x=0.054–0.063), full at half maximum (FWHMs) photoluminescence peaks (12 K) QWs are almost independent excitation position (FWHM=9.0–9.7 meV for Lw=2.4 6.9–7.3 Lw=3.6 nm)....