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Jung Soo Lee,Dong Ki Ahn,Won Shick Shin,Kyung Jun Cho,Young Rok Ko,Il Chan Hwang 대한정형외과학회 2022 Clinics in Orthopedic Surgery Vol.14 No.4
Clinics in Orthopedic Surgery 2020;12:485-492 https://doi.org/10.4055/cios20028 In the article entitled “Vertebral body anterior translation, a novel technique for delayed myelopathy due to osteoporotic spine fractures,”1) the name of one of the authors was incorrectly presented: Il Chan Whang should read Il Chan Hwang.
Preparation of anatase/rutile mixed-phase titania nanoparticles for dye-sensitized solar cells.
Hwang, Yong-Kyung,Park, Sung Soo,Lim, Jun-Heok,Won, Yong Sun,Huh, Seong American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.3
<P>Acid-labile high surface mesoporous ZnO/Zn(OH)2 composite material is used as a novel hard template for the preparation of mesoporous amorphous TiO2. The template-free amorphous TiO2 material is then thermally crystallized at suitable temperature to control the relative ratio of anatase and rutile phases in a particle. Four different anatase/rutile (AR) mixed-phase TiO2 nanoparticles (AR-3, AR-15, AR-20, and AR-23 denoted for the samples of 3%, 15%, 20%, and 23% rutile phase, respectively) are prepared and characterized by powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM). The coexistence of anatase and rutile phases in a TiO2 nanoparticle is visually confirmed by HRTEM analysis. These mixed-phase TiO2 nanoparticles are examined as candidates for photoelectrodes of dye-sensitized solar cells (DSSCs). The J-V curves and IPCE spectra for the DSSCs prepared from the mixed-phase TiO2 nanoparticles are obtained, and their photovoltaic properties are investigated. The photo-conversion efficiency (eta) indicates the highest value of 5.07% for AR-20. The synergistic effect of coexisting anatase and rutile phases with an optimal ratio in a TiO2 nanoparticle of AR-20 for an efficient interfacial transfer of photo-generated electrons is likely to lead to the highest efficiency among the AR-n samples.</P>
Jun, Jong-Won,Lee, Ji-Sun,Seok, Hwi-Young,Chang, Jong-San,Hwang, Jin-Soo,Jhung, Sung-Hwa Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
Various reaction conditions uding temperature, time and type and concentration of templates have been changed in order to facilely synthesize, especially with microwave (MW) heating, SAPO-34 molecular sieves. SAPO-34 molecular sieve can be synthesized rapidly with microwave irradiation from a gel containing tetraethylammonium hydroxide (TEAOH) as a template. However, other several templating molecules lead to SAPO-5 molecular sieve under microwave irradiation even though SAPO-34 is obtained by conventional electric synthesis from the same reactant gels. Moreover, SAPO-34 can be obtained more easily by increasing the TEAOH or silica concentration or by increasing the reaction temperature. SAPO-34 can be obtained within 5 min in a selected condition (high temperature of 210 $^{\circ}C$) with microwave heating, which may lead to a continuous production of the important material. SAPO-34 synthesized by microwave irradiation is homogeneous and small in size and shows acidity and a stable performance in the dehydration of methanol and 2-butanol to olefins, suggesting potential applications in acid catalysis.
Design of piezoelectric ocean-wave energy harvester using sway movement
Hwang, Won Seop,Ahn, Jung Hwan,Jeong, Se Yeong,Jung, Hyun Jun,Hong, Seong Kwang,Choi, Jae Yoon,Cho, Jae Yong,Kim, Jung Hun,Sung, Tae Hyun Elsevier Sequoia 2017 Sensors and actuators. A Physical Vol.260 No.-
<P><B>Abstract</B></P> <P>The use of energy harvesting technologies for supplying power generating energy to wireless devices and sensors, particularly in scenarios where it is difficult to exchange or recharge batteries, has recently attracted considerable research attention. In this context, we report the design of a piezoelectric energy harvesting system that can be used to harvest energy from the ocean. The harvester is composed of a piezoelectric cantilever structure and a magnet as the tip-mass of the piezoelectric module, atop which a rail (tube) with a metal ball is positioned. The system is tested with a setup that simulates ocean waves. Our findings indicate that our approach can be utilized in the design of multipurpose piezoelectric energy harvesting systems for low frequency vibration and in “sea-based” applications involving buoys and boats.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We design a piezoelectric ocean-wave energy harvester (POEH) that can harness wave energy. </LI> <LI> The POEH uses a ball-and-rail mechanism to induce cantilever vibrations. </LI> <LI> The POEH yields improved voltage and power output than cantilever system. </LI> <LI> Our device can be used for low-frequency energy harvesting applications. </LI> </UL> </P>