Lee J. – TechConnect Briefs

A New Gas/Supercritical Fluid (SCF) Diffusivity and Solubility Measurement Method for CO2 Saturated Polymer Systems Using Optical Transmission Property

Yao S.X., Lee J-K, Lee J., Lee P-C, Lee J-K, Lee J., Lee P-C, Jun M.B.G., Lee J-K, Lee J., Lee P-C, University of Vermont, US

Supercritical fluids (SCFs) and gases are widely used in polymer processing. For example, plastic foam products used for light-weight structural components, heat insulation, and food packaging can be fabricated by nano-/micro-cellular foaming processes with gases [...]

Thermoelectric temperature sensors by printing with a simple office inkjet printer

Chae H., Jung M., Soum V., Lee J., Kim H., Kim T., Cheong H., Kim H., Kim T., Jeon S., Kwon O-S, Shin K., Sogang University, KR

Recently, printing temperature sensors have been significantly demanded in the paper electronics, such as electronic skin for robots, polymer chain reaction for DNA amplification. Here we present printing thermoelectric temperature sensors by using a simple [...]

Fabrication of Active Digital Microfluidic Paper Chips with Inkjet-printed Patterned Electrodes and their Point-of Care Biomedical Application

Ko H., Lee J., Kim K., Kim Y., Kee Y., Kim K., Kim Y., Jung C-H, Choi J-H, Kwon O-S, Shin K., Sogang University, KR

Active, paper-based, microfluidic chips driven by electrowetting are fabricated by using inkjet printing and demonstrated for reagent transport and mixing. Instead of using the passive capillary force on the pulp to actuate a flow of [...]

Synthesis of hollow silica particles with tunables ize,shell thickness,and morphology

Kim J., Lee J., Chang H., Choi J.W., Jang H-D, Kim J., Korea Institute of Geoscience and Mineral Resources, KR

Here, we provide simple methods to modify the particle size, shell thickness, and the morphology of hollow silica particles (HSPs). To synthesize the HSPs, we adopted polystyrene (PS) particles as a sacrificial template. Size tune [...]

Influence of resist composition on demolding force in UV nanoimprint lithography

Amirsadeghi A., Lee J., Park S., Louisiana State University, US

We investigated the influence of the Young’s Modulus (E) of UV resist on the measured demolding force in UV-NIL by varying compositions of UV-curable polymers. We found that decreasing crosslinking content of the polymers decreases [...]

Energy Conversion according to Impact loading on Piezoelectric material

Lee J., Kim T., Choi B., Sogang University, KR

Energy harvesting using piezoelectric material has been one of the hottest interests in powering wireless sensor nodes without maintenance and replacement of wired or battery power system in ubiquitous era. Unlike most of the previous [...]

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 [...]