Seoul National University – Page 4

Bacterial Concentration Detection with Dielectrophoresis and Capacitive Measurement

Yoo J-H, Cha M.S., Lee J., Seoul National University, KR

The concentration of Escherichia coli (E.coli) cells in water was detected by depositing them on an array of electrodes using dielectrophoresis (DEP). Electrowetting was used to effectively concentrate the E.coli in a droplet of water [...]

Ultra-thin gold membrane transducer

Kim H., Kim Y., Cha M., Kim H., Kim Y., Lee J., Lee S., Shin J., Lee J., Lee S., Seoul National University, KR

This work deals with ultra-thin metal-based nanomechenical transducers that have potentials for extraordinary sensitivity. This nano membrane transducer (NMT) consists of a flat thin film of gold with 30-60 nm thickness freely suspended over large [...]

Discrete Volume Controllable Microdispenser Module

Lee J., Lee S., Lee J., Lee S., Seoul National University, KR

We report a microdispenser that can meter and mix sub-nanoliter liquids in a discrete quantity. Our device is based on the structural stopping valve used in passive dispensers. A vent channel was proposed, designed for [...]

Bacterial Concentration Detection with Dielectrophoresis and Capacitive Measurement

Yoo J-H, Cha M.S., Lee J., Seoul National University, KR

The concentration of Escherichia coli (E.coli) cells in water was detected by depositing them on an array of electrodes using dielectrophoresis (DEP). Electrowetting was used to effectively concentrate the E.coli in a droplet of water [...]

Biological influence of nanofibrous hydroxyapatite-polycaprolactone membrane on human periodontal ligament cell

Kim H.W., Kim T.I., Lee S.J., Ku Y., Rhyu I.C., Chung C.P., Han S.B., Kim H.W., Kim T.I., Seoul National University, KR

This study was performed to evaluate the effect of hydroxyapatite-coated nanofibrous polycaprolactone membrane on proliferation and differentiation of periodontal ligament cell which is necessary for periodontal regeneration. Hydroxyapatite-coated nanofibrous polycaprolactone membrane was fabricated through electrospinning [...]

Rhodamine B Isothiocyanate-Modified Ag Nanoaggregates on Dielectric Beads: A Novel Surface-Enhanced-Raman-Scattering and Fluorescent Imaging Material

Kim K., Lee H.B., Lee J.W., Jang H.J., Lee H.B., Lee J.W., Seoul National University, KR

Ag-deposited silica and polystyrene beads are efficient surface-enhanced-Raman-scattering (SERS) substrates that can be used as core materials of SERS-based biosensors. In this work, we report that once rhodamine B isothiocyanate (RhBITC) is adsorbed onto them, [...]

Periodic Nanowell Array using Template-Assisted Nanosphere Lithography

Jung S., Lee J., Seoul National University, KR

This paper presents a template-assisted nanosphere lithography(NSL) to obtain high-quality crystal in regularity and coverage(Figure 1). A periodic array of 100-nm deep, 360-450 nm wide nano-trenches was fabricated by nano imprint lithography(NIL), and used as [...]

Single-Walled Carbon Nanotube Network based Biosensors using Aptamers and its Characteristics

Kim D.W., Seo S.M., Park Y.J., Seoul National University, KR

We have successfully demonstrated the single-walled carbon nanotube (SWNT) network based biosensor using aptamers as the protein recognition site. The single-walled carbon nanotube network was used to improve the uniformity in I-V characteristics. Aluminum was [...]

Characterization on Dioxin Emission of TiO2 Nanoparticle-Encapsulating Poly(vinyl chloride) (TEPVC) compared to conventional PVC

Yoo H., Kim S-H, Lee A.R., Kwak S-Y, Seoul National University, KR

In our previous study, we first prepared TiO2 nanoparticle-encapsulating poly(vinyl chloride) (TEPVC) aiming at breakthrough to enhance the dispersibility of TiO2 nanoparticles in PVC matrix to maximize catalytic activities of TiO2 nanoparticles. The present study [...]

Mesoporous Titanium Dioxide Sphere with Anatase-Type Crystalline Structure using Cyclodextrin as Templates for Nano-sized Pore with Narrow Size Distribution

Chung J.W., Kim H.-J., Kwak S-Y, Seoul National University, KR

Mesoporous titanium dioxide (CD-TiO2) sphere with pore diameter in several nanometers and narrow pore size distribution was prepared from beta-cyclodextrin (beta-CD) and titanium precursor via sol-gel reaction in aqueous acidic condition. beta-CD was used as [...]