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( Arash Badakhsh ),김병주 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Carbon nanotubes (CNTs) are cylindrical particles, known for their supreme electrical and thermal properties, that can act as interfacial bridges between adjacent particles within the composite material. This could be more beneficial when plate-like particles or long fibers are used as the supplementary filler. Graphene nanoplatelet (GNP) particles are a good alternative for the secondary filler which can reduce the CNT interface loss by forming better and larger connective networks. In this study, CNTs of different lengths and GNPs were used to reinforce the unsaturated polyester resin (UPR) matrix. The fabricated composites were then analyzed by thermal conductivity and electrical conductivity measurements. Thermoset matrix was reinforced with various loadings of the hybrid nanocarbon filler to observe the changes in properties as a function of filler content.
Badakhsh, Arash,Lee, Young-Min,Rhee, Kyong Yop,Park, Chan Woo,An, Kay-Hyeok,Kim, Byung-Joo Elsevier Science Ltd 2019 Composites Part B, Engineering Vol.175 No.-
<P><B>Abstract</B></P> <P>Improving the utilization of industrial thermal waste and abundant solar thermal energy is of immense significance in energy management and thermal engineering. Latent heat thermal storage is one of the emerging methods that employ the large caloric density of materials mainly as a result of its constant-temperature phase-change process. Herein, paraffin was selected as the phase-change matrix which was reinforced with length controlled-carbon nanotubes (LCCNTs) as the primary filler and graphene nanoplatelets (GNPs) as the secondary reinforcing nanoparticles. Electrical conductivity (EC) of samples was tested, and carbon nanotube (CNT) was proved to be more effective in the increase of EC, than GNP. Furthermore, the thermal conductivity of the fabricated composite phase-change material was measured, and at the filler ratio of 5 phr an enhancement of about 148.0% was found compared with that of pristine paraffin. Optimal CNT/GNP ratios were also determined at the maximum enhancement achieved for each property. To observe the effect of LCCNTs on the mechanical properties of composites, polyester resin-based composites were prepared, and the tensile strength results are reported.</P>
( Arash Badakhsh ),김현혜,박찬우,김병주 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Metal oxide nanoparticles have been highly regarded for their fine antimicrobial effects in the design and application of materials. There have been many reports regarding this topic and they suggest among several metal oxide materials, zinc oxide (ZnO) nanoparticles exhibit better bactericidal characteristics. However, use of nanoparticles in general, demands an improvement in dispersion of these particles within the matrix material particularly polymers. To tackle this issue in this study, microsize copper (Cu) powder was used as the metallic bed for ZnO nanoparticles. This was attempted to enhance the distribution of antimicrobial ZnO within the matrix for the potential composite applications. Mechanical alloying was used as the coating technique to properly decorate the copper surface with ZnO nanoparticles. Various characterization methods including SEM and laser diffraction particle size analyzer were carried out to analyze the quality of the cermet blend.
Synthesis of ceramic coating on copper microspheres for thermal management of electronics
이용민,( Arash Badakhsh ),김병주 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
As the advanced electronic technologies rapidly emerge, the need for efficient thermal management of such units becomes of major significance. Currently, most of the epoxy adhesives used in such systems are reinforced with metal and/or other conductive particles. Despite their desirably high thermal conductivity, use of such materials increase the risk of unwanted electrical flows within the chip, which may result in explosion and destruction of the whole unit. To address this issue in the present study, copper (Cu) microspheres were chemically coated with a thin ceramic layer which possesses a much higher electrical resistance compared with pristine metal. Silicon nitride (SiN) and aluminum nitride (AlN) were synthesized on copper by the means of chemical dipping and post-heat treatment.