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배준호,심이레,박미나,강치중,최영진 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.4
We report a significant enhancement of the field emission properties of ZnO nanowires by converting them to ZnO nanocones. The conversion of the morphology was realized by simple chemical etching of ZnO nanowires in an aqueous solution of HCl, while the initial areal density of nanowires was not affected by the conversion. The field emission measurements of ZnO nanowires and nanocones reveal that the field enhancement factor is increased from 1105 (nanowires) to 3703 (nanocones), indicating that the tapered cone-like morphology is more efficient for field emitters.
Dose Response Characteristics in Polymer Gel for the Composition Ratio
조삼주,심수정,김철용,심장보,이상훈,허현도,신동오,이레나 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
Although a gel dosimeter is not widely used, it has many potential merits for 3D dosimetry in the development of radiotherapy techniques. Because conventional gel dosimeters tend to sensitively polymerize with oxygen. A new polymer gel that solves these problems was introduced recently. The gel dosimeter contains anti-oxidants that eliminate oxygen chemically instead of using complicated facilities. The type and the concentration of the monomer affect the polymerization of the polymer gel dosimeter. Therefore, the polymerization of the normoxic polymer gel dosimeter is affected by anti-oxidant, the monomer, the constituent ratio, and the condition of the monomer, so many researchers have concentrated on the anti-oxidant, the type of monomer, and the constituent ratio. In this study, a normoxic polymer gel dosimeter was composed using anti-oxidants in a laboratory,and the dose response and sensitivity were measured. The results of this study are as follow the threshold R2 values were reduced, and the radio sensitivity was reduced with the increasing MAA ratio. Otherwise, the increase in the gelatin represented an increase and decrease in the threshold value of R2 values and the radio sensitivity, respectively. Therefore, in this study, 6 − 8 % MAA ratios and an 8 % gelatin ratio, considering the aging effect of the gel, were the optimal values.
노태호,심이레 한국표면공학회 2023 한국표면공학회지 Vol.56 No.4
In recent years, energy-management studies in buildings have proven useful for energy savings. Typically, during heating and cooling, the energy from a given building is lost through its windows. Generally, to block the entry of ultraviolet (UV) and infrared (IR) rays, thin films of deposited metals or metal oxides are used, and the blocking of UV and IR rays by these thin films depends on the materials deposited on them. Therefore, by controlling the thicknesses and densities of the thin films, improving the transmittance of visible light and the blocking of heat rays such as UV and IR may be possible. Such improvements can be realized not only by changing the two-dimensional thin films but also by altering the zero-dimensional (0-D) nanostructures deposited on the films. In this study, 0-D nanoparticles were synthesized using a sol –gel procedure. The synthesized nanoparticles were deposited as deep coatings on polymer and glass substrates. Through spectral analysis in the UV–visible (vis) region, thin-film layers of deposited zinc oxide nanoparticles blocked >95 % of UV rays. For high transmittance in the visible-light region and low transmittance in the IR and UV regions, hybrid multiple layers of silica nanoparticles, zinc oxide particles, and fluorine-doped tin oxide nanoparticles were formed on glass and polymer substrates. Spectrophotometry in the UV–vis–near-IR regions revealed that the substrates prevented heat loss well. The glass and polymer substrates achieved transmittance values of 80 % in the visible-light region, 50 % to 60 % in the IR region, and 90 % in the UV region.
A. A. Okhlopkova,S. A. Sleptsova,G. N. Alexandrov,A. E. Dedyukin,심이레,정대용,조진호 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.5
We investigated the tribochemical and wear properties of Polytetrafluoroethylene (PTFE) based polymer matrix composites with nanoceramic (NC) β-sialon, and Al2O3 particles for the mechanical seal applications at low temperature. SEM showed that NC particles were homogeneously distributed in the polymer matrix and initiated the formation of the supramolecular spherulites around NC. From the temperature stimulated depolarization (TSD) current results, it was analyzed that the surface charge on nanoceramic affected the formation of the spherulites structure. 2 wt % Al2O3 NC did not degrade the mechanical properties of PTFE so that composites showed the similar values of tensile strength, elongation at the rupture and friction coefficient as those of neat PTFE. However, the composite with 2 wt % Al2O3 NC revealed the improved wear resistance, wear rate of 0.4-1.2 mg/h at room temperature and 0.28 mg/h at −40 oC, respectively, while the neat PTFE the 70-75 mg/h at room temperature and 70.3 mg/h at −40 oC.
Effect of Carbon Black Activation on Physicomechanical Properties of Butadiene-nitrile Rubber
N. V. Shadrinov,E. A. Kapitonov,M. D. Sokolova,A. A. Okhlopkova,심이레,조진호 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.10
The effects of mechanical activation of carbon black on the processing and properties of butadiene nitrile rubber were studied. Mechanical activation of carbon black caused an improvement in the physical and mechanical properties of the butadiene-nitrile rubber, BNR-18AMN. The optimum activation time that would afford rubber with improved properties was established.
Analysis of the Dosimetric Characteristics of Normoxic Polymer Gel by Magnetic Resonance Images
이석,김철용,Dae Sik Yang,Young Je Park,Sam Ju Cho,심수정,이상훈,임상욱,Kwang Hwan Cho,Jin Ho Choi,이레나 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
A new type of polymer gel that eliminates the oxygen chemically instead of using complicated facilities was recently introduced. This study utilized a polymer gel fabricated in a laboratory as a reliable dosimeter for measuring therapeutic radiation. Studies on the optimal MR scan conditions was conducted. The reproducibility, the accuracy, and the dose rate dependency of the normoxic polymer gel dosimeter were evaluated. The relative dose uncertainty and the relative dose resolution of the polymer gel were also evaluated by scanning it under optimal MR scan conditions. The R2calculated by using echo time (TE) of 20, 40, 60, 80, and 100 ms versus dose was linear for 12 ~ 20 Gy. The polymer gel composed in this study can be used as a reliable dosimeter if it is scanned under optimal MR scan conditions.