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Roles of metal/activated carbon hybridization on elemental mercury adsorption.
Bae, Kyong-Min,Kim, Byung-Joo,Rhee, Kyong Yop,Park, Soo-Jin American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.8
<P>In this study, the elemental mercury removal behavior of metal (copper or nickel)/activated carbon hybrid materials were investigated. The pore structures and total pore volumes of the hybrid materials were analyzed using the N2/77 K adsorption isotherms. The microstructure and surface morphologies of the hybrid materials were characterized by X-ray diffraction and scanning electron microscopy, respectively. In the experimental results, the elemental mercury adsorption capacities of all copper/activated carbon hybrid materials were higher than that of the as-received material despite the decrease in specific surface areas and total pore volumes after the metal loading. All the samples containing the metal particles showed excellent elemental mercury adsorption. The Ni/ACs exhibited superior elemental mercury adsorption to those of Cu/ACs. This suggests that Ni/ACs have better elemental mercury adsorption due to the higher activity of nickel.</P>
CFRP/알루미늄 복합재에서 CFRP의 표면처리가 T-peel 강도에 미치는 영향
이경엽(Rhee Kyong Yop),양준호(Yang Jun Ho) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
This study investigates the surface treatment of CFRP (Carbon Fiber Reinforced Composites) to improve the T-peel strength of CFRP/aluminum composites. The surface of CFRP ([0˚]₁₄) was treated by Ar? ion beam under oxygen environment. T-peel tests were performed based on the procedure of ASTM D1876-95. The results showed that the T-peel strength of surface-treated CFRP/aluminum composites was about 5.5 times greater than that of untreated CFRP/aluminum composites.
Carbon nanotubes synthesis using diffusion and premix flame methods: a review
Garima Mittal,Vivek Dhand,Kyong Yop Rhee,Hyeon-Ju Kim,Dong Ho Jung 한국탄소학회 2015 Carbon Letters Vol.16 No.1
In recent years, flame synthesis has absorbed a great deal of attention as a combustion method for the production of metal oxide nanoparticles, carbon nanotubes, and other related carbon nanostructures, over the existing conventional methods. Flame synthesis is an energyefficient, scalable, cost-effective, rapid and continuous process, where flame provides the necessary chemical species for the nucleation of carbon structures (feed stock or precursor) and the energy for the production of carbon nanostructures. The production yield can be optimized by altering various parameters such as fuel profile, equivalence ratio, catalyst chemistry and structure, burner configuration and residence time. In the present report, diffusion and premixed flame synthesis methods are reviewed to develop a better understanding of factors affecting the morphology, positioning, purity, uniformity and scalability for the development of carbon nanotubes along with their correlated carbonaceous derivative nanostructures..
Yasser Zare,Kyong Yop Rhee,Soo Jin Park 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
This article develops a simple equation for the tunneling distance between neighboring carbonnanotubes (CNTs) in polymer CNTs nanocomposites (PCNTs) as a function of CNT concentration, CNTdimensions, interphase thickness, the percentage of networked CNTs, and the wettability of the CNTs bypolymer chains. The coupling of two developed models for the conductivity of PCNTs, assuminginterphase and tunneling effects expresses in this equation. The suggested equation calculates thetunneling distance for some PCNT samples at differentfiller concentrations, and expresses the impacts ofall the parameters on the tunneling distance. The appropriate predictions of the developed models for theconductivity of the samples and the acceptable levels of tunneling distance at various values of allparameters validate the suggested equation. The calculations indicate that the thinnest CNTs (radius of5 nm) and the largest CNTs (length of 5 mm) produced the shortest tunneling distance of 2.5 nm, but themaximum tunneling distance of 6.5 nm was observed at the CNT radius of 20 nm and length of 20 mm. Inaddition, the low surface energy of the polymer matrix and the high CNT surface energy result in a shorttunneling distance, but their roles in the tunneling distance are negligible.