KR – Page 2 – TechConnect Briefs

Functional Multi-layered Bio-scaffold by 3D printed and Electro spun biodegradable materials

Choi H.W., Keimyung University, KR

In paper, we are presenting a novel technology for the bio-scaffold fabrication. The fabricated scaffold is composed of 3 layers which include a 3D printed PLA in middle and electro spun nanofibers of PCL+Collagen on [...]

Concrete crack-healing materials using biocalcification by ureolytic bacteria isolated in marine environment: An overview

Kim H-Y, Son H.M., Lee H.K., Korea Advanced Institute of Science and Technology, KR

Micro-cracks on the surface of concrete structures frequently occur due to external force and shrinkage [1]. The deterioration of concrete durability is accelerated by the penetration of moisture and chemicals into microcracks and pores [2]. [...]

Rapid compressive strength achievement of coal bottom ash based geopolymer by employing microwave energy

Kim H., Hong S., University of Seoul, KR

Geopolymer has been introduced as a green alternative to Portland cement to reduce CO2 from cement industry. Unlike coal fly ash, coal bottom ash has not been used widely as a source material for geopolymer [...]

Effect of elevated hot temperatures on hybrid geopolymer synthesized with coal fly and bottom ashes

Kim H., Park C.W., University of Seoul, KR

Ordinary Portland Cement (OPC) concrete has been most widely used for construction materials although the strength deterioration of OPC concrete in high temperature has been pointed out as its inherent flaw. Considering that fire is [...]

Bromate free disinfection by high voltage pulse

Chang I-S, Hoseo University, KR

We designed and assembled high voltaged pulse generating system in our laboratory. The HVI system is consisted of power supply, high voltage generator, capacitors and impulse generator. The impulse with 10 to 20 kV/cm of [...]

Fabrication and Electrochemical Property of Hybrid Carbon Nanofibers Based on Polyimide Precursor and Manganese Dioxide

Han N.K., Jeong Y.G., Chungnam National University, KR

Supercapacitors have recently received great interest from industry and academia as one of energy storage devices due to their high power density, fast charge time, and long cycle life. In this study, hybrid carbon nanofibers [...]

Nanoporous thin film fabrication via magnetron sputtering and O2 plasma ashing process

Han S.H., Jang S.W., Hwang S., Hwang S.H., Hwang S., Hwang S.H., Korea Institute of Science and Technology, KR

We report a new method of fabricating nanoporous catalytic thin films. In the first step, metal–carbon thin films were prepared by reactive magnetron sputtering, using various metallic targets (Au, Ag, Pt, Cu, Ni, Ti) as [...]

Azide-alkyne cycloaddition by recyclable heterogeneous Cu catalysts on reverse phase silica gel

Jang Y., Kim H., Lim M., Rhee H., Hanyang University, KR

Previously, we developed heterogeneous Pd catalysts immobilized onto functionalized reverse phase silica gel. These catalysts were applied to Suzuki cross coupling reactions and the hydrogenation reactions in water with good results. In this study, Cu [...]

Pd nanoparticles immobilized onto polymer-inorganic hybrid support: Synthesis, characterization and catalytic activity on Suzuki-Miyaura coupling reactions in water

Lim M., Kim H., Jang Y., Rhee H., Hanyang University, KR

The development of heterogeneous metal catalysts supported on a solid support has attracted attention. This catalyst system has the advantages of ease of catalyst separation and reusability, and has higher reactivity due to the larger [...]

Researches of visible light photo-sensitized porphyrin-TiO2 photocatalyst and its related self-cleaning effects

Min K., Manivannan R., Lee S-G, Son Y., Chungnam National University, KR

The sensitization of TiO2 with a wide variety of inorganic and organic dyes for light harvesting has been investigated over the last 2 decades for the development of efficient energy harvesting. Porphyrins, as important biomolecules, [...]