Research Areas > Flow Control Based on Microfluidics & Nanofluidics

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Development of digital stereo-holographic microscopy for particle dynamics

Post Image  Digital stereo-holographic microscopy (DsHM) utilizes two holograms from different views. It can reconstruct rough shape of sample in 3D space without depth-of-focus problem. This technique will be useful for analyzing 3D dynamics of particles and cells.   내용 보기

Precise 3D orientation measurement of ellipsoidal particles

Post Image  Light scattering pattern from ellipsoidal particle is reconstructed using digital holographic microscopy. 3D orientation of ellipsoidal particle, which is essential for 3D dynamics analysis, can be measured.   내용 보기

Superhydrophobic Surfaces Fabricated by Plasma Treatment

Post Image  Fabrication of superhydrophobic surfaces is an area of great interest because it can be applicable to various engineering fields. A simple, safe and inexpensive fabrication process is required to fabricate applicable superhydrophobic surfaces. In this study, we developed a facile fabrication method of nearly perfect superhydrophobic surfaces through plasma treatment with argon and oxygen gases. A polytetrafluoroethylene (PTFE) sheet was selected as a substrate material. We optimized the fabrication parameters to produce superhydrophobic surfaces of superior performance using the ...   내용 보기

Anti-rebound of polymer drops

Post Image Small addition of polymers can greatly affect the dynamics of the impacting droplet. One representative effect is that the rebound of droplets are suppressed. There were several theories to explain this phenomena, and it was found to be the polymer residue which increases the line resistance. The concentration and the molecular weight reciprocally affect the anti-rebound phenomena and we suggest equation which can estimate the rebound of polymer droplet.    내용 보기

Three-dimensional digital microfluidic manipulation

Post Image We develop a three-dimensional digital microfluidic (3D DMF) platform with patterned electrodes submerged in an oil medium to provide fundamental solutions to the technical limitations of 2D DMF platforms and water–air systems. 3D droplet manipulation on patterned electrodes is demonstrated by programmably controlling electrical signals. The formation of precipitates on the 3D DMF platform is demostrated by using reactions of different chemical samples. A droplet containing precipitates, hanging on the top electrode, can be manipulated without adhesion of precipitates to the solid sur...   내용 보기

Application of digital holographic microscopy

Post Image Digital holographic microscopy (DHM) is applied to track 3D positions of ellipsoidal particles. Reconstructed images of ellipsoidal particles gives information on the unique light scattering pattern. By calculating the focal length created by lens effect and astigmastism by the ellipsoidal particle, precise location of particle is obtained. Precise positioning of nonspherical particle could be useful for studying dynamics of various-shaped particles.   내용 보기

New tracer particle for X-ray imaging: Surface modified AuNPs

Post Image  X-ray based imaging is one of the most powerful and convenient methods in terms of versatility in energy generated and high performance in use. Different from various nuclear medicine imaging, contrast agents are necessarily needed in X-ray imaging especially for effectively targeted and molecularly specific functions. Contrast to the many-reported static accumulation of the contrast agents in targeted organs, dynamic visualization in the living organism is successfully accomplished for the first time. A non-transparent biofluid is monitored by X-ray imaging technique using gold nanopart...   내용 보기

Wettability and impact dynamics of water droplets on rice leaves

Post Image The leaves of certain plants, such as lotus and rice, contain superhydrophobic surfaces. These plants have been widely studied because of their unique water repellent and self-cleaning characteristics. Such unique features, known as the lotus effect, are mainly attributed to micro- and nano-scale surface structures, as well as the chemical composition of wax on the surface. We investigated the wettability and impact dynamics of water droplets on rice leaves at various leaf inclination angles and orientations. Contact angle, contact angle hysteresis, and roll-off angle of water droplets were me...   내용 보기

Phase-contrast holography microscopy

Post Image     A digital holo-graphic micro-scopy (DHM) based on inter-ferometric technique was developed to measure the phase and optical path length distribution.   내용 보기

3D measurement of red blood cells motion using digital holographic PTV (DHPTV)

Post Image Comprehensive studies on blood flow circulation have been carried out due to increased circulatory vascular diseases. However, experimental analysis of dynamic behavior of blood cells in capillary vessels, especially 3D motion, is still not easy due to technological limitations. Digital holographic PTV was employed to measure the 3D motion and velocity fields of red blood cells in capillaries. The 3D spatial distribution of red blood cells was detected in a given position from the hologram. Using a pair of holograms captured with a small time interval (Δt), a 3D velocity field can be obtai...   내용 보기