Masanori Eguchi

National Institute of Technology, Kure College

Many dielectrophoretic (DEP) devices for biomedical application have been suggested, such as the separation, concentration, and detection of biological cells or molecules. Most of these devices utilize the difference in their DEP properties. However, single-cell analysis is required to evaluate individual properties. Therefore, this paper proposed...

In this paper, complex impedance locus of the triangular-shaped electrodes with immobilized λDNAs were calculated by numerical simulations. Compare with the impedance of the electrodes with immobilized λDNAs, its impedance after deoxyribonuclease (DNase) treatment were increased by about three times or more. The DNA molecules can be applied to elec...

In this paper, complex impedance locus of the triangular-shaped electrodes with immobilized λDNAs were calculated by numerical simulations. Compare with the impedance of the electrodes with immobilized λDNAs, its impedance after deoxyribonuclease (DNase) treatment were increased by about 3 times or more. The DNA molecules can be applied to electric...

The neuromorphic learning switching behavior was investigated in electric devices that were constructed based on the aggregation of thiolstabilized Ag/Ag2S core–shell nanoparticles (NPs). The NPs were synthesized using the two-phase modified Brust–Schiffrin procedure and exhibited Ag–S and Ag–S–R bonding states at the surfaces of Ag NPs. The memris...

In this study, a new type of dielectrophoretic (DEP) cell-separation device having a parallel-plate flow channel structure was proposed to realize high throughput cell separation. The proposed device consisting of a planar electrode on the top and a planar glass plate, on which interdigitated electrodes arrays were vacuum-deposited, at the bottom w...

We proposed a quadrupole capillary dielectrophoretic (DEP) device, which was a new DEP device enabling invasive and effective cell-separation without contacting the cell suspension to metal electrodes. The device consisted of four brass rods and a glass capillary. The brass rods were glued around the glass capillary to facilitate cell separation by...

We developed an insulator‐based dielectrophoretic (iDEP) creek‐gap device that enables the isomotive movement of cells and that is suitable for determining their DEP properties. In the iDEP creek‐gap device, a pair of planar insulators forming a single fan‐shaped channel allows the induction of the isomotive iDEP force on cells. Hence, the cells’ b...

Dielectrophoresis (DEP) has great potential for cell separation due to its noninvasive and label-free nature. Cells subjected to a non-uniform AC electric field experience DEP force. The magnitude of DEP force and the direction of the force with respect to the field gradient vary dependently on medium conductivity, cell diameter and Re(β), the real...

Various microfluidic devices utilizing the principle of dielectrophoresis (DEP) have been developed to separate, concentrate, and characterize biological cells; however, their performance is still limited by a lack of quantitative characterization. We addressed this limitation by employing a method capable of accurately quantifying a cell's respons...

Free-standing strontium titanate (SrTiO3/STO) nanoparticles (NPs) were synthesized by the sol–gel method. X-ray diffractometry revealed that the required minimum annealing temperature to synthesize pure and highly crystalline STO NPs was 500 °C. Moreover, morphological observation by field emission scanning electron microscopy showed that the STO N...

Complex permittivity of hydrated soil included in lands was measured by setting the water volume content to be from 2.5% to 15% for landslides prognostication at frequency bands from low frequency (LF) to medium frequency (MF). The main emphasis is placed on a simple test equipment, which consists of top and bottom electrodes in a plastic cylinder...

Because radiation patterns of conventional antennas at the security gates are not enough sharp, many false operations are pointed out to recognize the RF-tags located in short distance away from the security gates. In this paper, a technique to narrow down the radiation patterns of the antenna operationally was proposed while keeping antenna size t...

We propose a novel, high-performance dielectrophoretic (DEP) cell-separation flow chamber with a parallel-plate channel geometry. The flow chamber, consisting of a planar electrode on the top and an interdigitated-pair electrode array at the bottom, was developed to facilitate the separation of cells by creating a nonuniform AC electric field throu...

A new process for forming an SiC layer is proposed in which a surface of metal silicon is exposed to gaseous SiO and a gaseous carbon compound at around 1400°C, thereby an SiC layer is formed substantially only on the surface of metal silicon. The resulting SiC layer is of crystalline cubic SiC and a few tens µm in thickness. We consider that the c...

In this study, a simple and fast approach of band gap formation in a single layer graphene nanoribbon (sGNR) is demonstrated by using hexaazatriphenylenehexacarbonitrile (HAT-CN6) as an adsorbate molecule. sGNRs were successfully synthesized through the unzipping of double-walled carbon nanotubes followed by casting HAT-CN6 in acetone solution to a...

A new chemical vapor deposition process for coating SiC is proposed in which gaseous SiO and toluene vapor are reacted to generate SiC in the presence of iron oxide as a catalytic component. At a temperature of 1450°C, SiC can be formed substantially from gaseous SiO and toluene vapor only at positions of iron oxide deposition. When iron oxide is d...

The variability in cell response to AC electric fields is selective enough to separate not only the cell types but also the activation states of similar cells. In this work, we use dielectrophoresis (DEP), which exploits the differences in the dielectric properties of cells, to separate nonviable and viable cells. A parallel-plate DEP device cons...

Dielectrophoresis can be used to determine the dielectric properties of biological cells. In this paper, we present an electrode design for characterization of blood cells by measuring negative dielectrophoretic force. The negative dielectrophoretic force acting on glass beads in distilled water was measured by inclined gravity to evaluate the effe...

Dielctrophoresis (DEP) is a movement of particles in medium by a force, which is generated in non-uniform electric fields. The Dielectrophoretic force (DEP force) depends on the geometry of an electrode. In this paper, the design and the simulation of the ceiling electrode to separate biological cells by using positive dielectrophoresis and incline...

In this paper, we present the methods of the particle separation by employing dielectrophoresis (DEP) and traveling-wave electroosmosis (TWEO). When particles are on a plane electrode, the particles do not experience the DEP force. Because the electric field at surface of the plane electrode is zero. Thus it is necessary to transport all particles...

In this study, we present the methods of the particle separation by employing electrokinetic phenomena (dielectrophoresis (DEP) and traveling-wave electroosmosis (TWEO)) and the inclined gravity. The methods can separate particles of same sign DEP. However, it is very difficult to separate particles on a plane electrode. To cope with this problem,...

In travelling-wave electric fields, particles are propelled along electrode arrays by a propulsion force. The propulsion force depends on an applied frequency, voltage and size of particles. In this paper, we present the separation method of micro particles using the propulsion force and inclined gravity. The suspensions of polystyrene beads were u...

Under travelling-wave electric fields, particles are propelled along an electrode array by the travelling-wave dielectrophoresis and the travelling-wave electroosmotic fluid flow. In the low frequency range, the horizontal movement of particles is dominated by the travelling-wave electroosmotic fluid flow. The fluid flow depends on the geometry of...

A technique to control the radiation pattern of an NRD guide compatible pyramidal horn antenna, which consists of a tapered dielectric rod inserted into the horn, has been developed for multiple access LAN applications at 60 GHz. It has been found that the phase distribution on the aperture of the horn is influenced by the dielectric rod, and, thus...