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.
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Research Areas >
Flow Control Based on Microfluidics & Nanofluidics
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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.
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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.
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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
...
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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.
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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...
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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.
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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...
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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...
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A digital holo-graphic micro-scopy (DHM) based on inter-ferometric technique was developed to measure the phase and optical path length distribution.
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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...
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