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Effect of nanosize titanium oxide on electrochemical characteristics of activated carbon electrodes
서민강,박수진 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Energy-storage composite electrodes were prepared by mixing activated carbons (ACs) modified with nanosize titanium oxide (TiO2) through ultrasonic vibration in ethanol solution for 30 min. We examined the cyclic voltammetry of the composite electrodes in an aqueous electrolyte, 1 M H2SO4. It was found that the specific capacitance of the composite electrodes measured in a range of 0–0.8 V was increased from 100 to 155 F/g compared electrodes comprised of ACs only. This was attributed to a reduction of polarization of the ACs modified by nanosized TiO2.
서민강,이경엽,박수진 한국물리학회 2011 Current Applied Physics Vol.11 No.3
In this study, the influence of electro-beam (EB) irradiation on electrical properties of carbon blacks (CBs)-filled high-density polyethylene (HDPE) conducting polymer composites was investigated in a dosage of 30―150 kGy. From the experimental results, the room temperature resistivity and positive temperature coefficient (PTC) intensity of the conducting polymer composites were dependent, to a large extent, on the CB content that were controlled in the relative arrangements of the CB aggregates in a polymeric matrix. And the negative temperature coefficient (NTC) behavior of the conducting polymer composites was disappeared from a dosage of 60 kGy. It was also found that the EB irradiation led to an improvement of electrical reproducibility of the conducting polymer composites, which was probably due to the reduction of free movement of CB particles at above the melting temperature of HDPE polymer crystalline regions, resulting from increasing the crosslinking structure of CBs/HDPE conducting polymer composites.
서민강,Joon-Hyung Byun,박수진 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.5
The mechanical properties of multiwalled carbon nanotubes (MWNTs)-reinforced epoxy matrix composites with different weight percentages of MWNTs have been investigated. Also, the morphologies and failure behaviors of the composites after mechanical tests are studied by SEM and TEM analyses. As a result, the addition of MWNTs into the epoxy matrix has a remarkable effect on the mechanical properties. And the fracture surfaces of MWNTs/epoxy composites after flexural strength tests show different failure mechanisms for the composites under different nanotube contents. Also, a chemical functionalization of MWNTs can be a useful tool to improve the dispersion of the nanotubes in an epoxy system, resulting in increasing the mechanical properties of the composite materials studied.