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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..
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>
A Comprehensive Review of Graphene Nanocomposites: Research Status and Trends
Dhand, Vivek,Rhee, Kyong Yop,Ju Kim, Hyun,Ho Jung, Dong Hindawi Limited 2013 Journal of nanomaterials Vol.2013 No.-
<P>This paper provides a comprehensive review of the present trends in graphene research with an emphasis on graphene-based nanocomposites and their applications. Various synthesis routes have recently been devised for mass production of graphene to address the needs of the composite industry. This paper describes the worldwide scenario of research and patents being conducted in the field of graphene nanocomposites. It concludes with a discussion of the impact of graphene in composites and the future challenges to meeting industrial demands.</P>
Zhang, Yinhang,Rhee, Kyong Yop,Park, Soo-Jin Elsevier 2017 Composites Part B, Engineering Vol.114 No.-
<P><B>Abstract</B></P> <P>Novel hybrid fillers composed of nanodiamond (ND) nanocluster-decorated graphene oxide (GO) were fabricated and incorporated in an epoxy matrix using a facile thermoregulatory liquid-liquid extraction method. X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy analyses confirmed a chemical bonding between the (3-aminopropyl)triethoxysilane-functionalized ND and (3-glycidyloxypropyl)trimethoxysilane-functionalized GO. The morphology of the hybrid filler (GN) was characterized by field-emission transmission electron microscopy. ND nanoclusters with an average diameter of 50–100 nm were uniformly grown on the GO surface. The hybrid filler provided significant enhancement of mechanical properties, such as flexural strength, flexural modulus, and fracture toughness. In particular, the epoxy composite containing 0.1 wt% of GN hybrid exhibited a stronger mechanical behavior compared to that containing 0.2 wt% of GO. As the GN loading increased, the thermal stability, the integral procedural decomposition temperature, and the activation energy increased as well. The toughening mechanism was illustrated by a microcrack theory based on the microscopic analysis of the fracture surfaces. The presence of ND nanoclusters not only hindered the aggregation of the GO sheets, but also played a crack pinning role in the polymer-matrix composites, which could significantly enhance its fracture toughness.</P>
Zare, Yasser,Rhee, Kyong Yop Academic Press 2017 Journal of Colloid and Interface Science Vol. No.
<P><B>Abstract</B></P> <P>Kolarik proposed a model for tensile strength of polymer particulate composites based on the cubic orthogonal skeleton or three perpendicular plates (3PP) system. In this paper, Kolarik model is expanded for tensile strength of polymer nanocomposites containing spherical nanoparticles assuming the interphase properties. This model expresses the strength as a function of interphase properties. This development is performed using some models such as Pukanszky and Nicolais-Narkis. The expanded model is applied to calculate the thickness and strength of interphase by the experimental results. Furthermore, the strength of polymer nanocomposites is evaluated at different levels of material and interphase properties. The experimental data show good agreement with the predictions of the developed model.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Zare, Yasser,Rhee, Kyong Yop Elsevier 2018 Composites. Part B, Engineering Vol.155 No.-
<P><B>Abstract</B></P> <P>This study develops a power-law model for characterizing the conductivity of polymer carbon nanotube (CNT) nanocomposite by defining the “b” exponent as a function of main parameters such as filler dimensions, filler waviness, interphase thickness, network fraction, tunneling distance, and polymer-filler interfacial energy. Both “b” and conductivity are calculated, and the effects of these parameters on the conductivity are determined. The model accurately predicts the experimentally measured conductivity of the samples. The highest filler conductivity and the lowest “b” exponent cause the maximum conductivity. Some parameters, such as tunneling distance, filler concentration, filler radius, interphase thickness, and waviness, directly affects the “b” exponent, while other parameters, such as the fraction of percolated CNT, interfacial energy, and filler length, demonstrate an inverse relationship with “b.” In addition, short tunneling distance, high filler fraction, thin and large nanotubes, thick interphase, poor waviness, high network fraction, and high interfacial energy produce a high conductivity.</P>