Author: 공과대학 교학팀
Rare-earth free/lean permanent magnets and their applications
Rare-earth free/lean permanent magnets and their applications Jihoon Park Department of Magnetic Materials, Powder Materials Division, Korea Institute of Materials Science, Changwon, Gyeongnam, 51508, Republic of Korea Permanent magnet materials are essential for converting mechanical and electrical energy and are required for electric vehicles, electronics, wind turbines, etc....
2023년 1학기 공과대학 중간고사 간식행사 개최(2023.04.14.)
Accurate prediction of thermophysical properties of supercritical hydrocarbon aviation fuels and its application
ACCURATE PREDICTION OF THERMOPHYSICAL PROPERTIES OF SUPERCRITICAL HYDROCARBON AVIATION FUELS AND ITS APPLICATION Hyung Ju Lee, Ph.D. Assistant Professor, Department of Mechanical Engineering, Pukyong National University ABSTRACT Scramjet engines have been studied worldwide for decades for applications in hypersonic flight over the Mach 5 within the atmosphere, as they...
Growth and Applications of Hexagonal Boron Nitiride
Growth and Applications of Hexagonal Boron Nitride by Chemical Vapor Deposition Hyeon Suk Shin Department of Chemistry, Ulsan National University of Science and Technology, Ulsan 44919, Republic of Korea shin@unist.ac.kr Hexagonal boron nitride (hBN) is a promising two-dimensional (2D) material owing to its unique optical properties in the deep-UV region, mechanical robustness, thermal stability, and chemical inertness. hBN thin films have gained significant attention for various applications, including nanoelectronics, photonics, single photon emission, anti-corrosion, and membranes. Thus, wafer-scale growth of hBN films is crucial to enable their industrial-scale applications. In this regard, chemical vapor deposition (CVD) is a promising method for scalable high-quality films. To date, considerable efforts have been made to develop continuous hBN thin films with high crystallinity, from those with large grains to single-crystal ones, and to realize thickness control of hBN films by CVD. However, the growth of wafer-scale high crystalline hBN films with precise thickness control has not been reported yet. The hBN growth is significantly affected by substrate, in particular the type of metals, because the intrinsic solubilities of boron and nitrogen depend on the type of metal. In this talk, state-of-the-art strategies adopted for growing wafer-scale, highly crystalline hBN are summarized, followed by the proposed mechanisms of hBN growth on catalytic substrates. Furthermore, various applications of the hBN thin films are demonstrated, including a dielectric layer, an encapsulation layer, a wrapping layer of gold nanoparticles for surface enhanced Raman scattering, a proton-exchange membrane, a template for growth of other 2D materials or nanomaterials, and a platform of fabricating in-plane heterostructures. ...
2023년 1학기 공과대학 학부생 개강총회(2023.03.22.)
ALD Based Synthesis and Applications of Nanomaterials and Other Related Emerging Materials
ALD Based Synthesis and Applications of Nanomaterials and Other Related Emerging Materials Hyungjun Kim School of Electrical and Electronic Engineering, Yonsei University Recently, the exclusive benefits of atomic layer deposition (ALD), including excellent conformality over nanoscale complex structures, high quality of deposited films even at low temperature down...
Polymer Dots for Photocatalysis
Organic Polymer Dots for Photocatalysis Organic polymeric photocatalysts have been attracted scientists’ interests during past years due to their low-cost, tunable bandgaps and energy levels, and promising photocatalytic performance. Making the traditional hydrophobic polymeric photocatalyst into nano-particles with size less than 100 nm, so-called polymer dots (Pdots), has shown significantly enhanced photocatalytic activity. Rational design of organic polymers is one of strategies to improve photocatalytic performance for hydrogen production. Moreover, making heterojunction Pdots can efficiently separate photogenerated charges within Pdots as well as utilize energy transfer process to enhance the light harvesting efficiency. In this talk, I will discuss our research achievements in optimization of polymer structures on Pdots photocatalysis, study of photocatalytic mechanism in heterojunction Pdots systems and applications of Pdots in bio-hybrid photocatalytic systems....