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최헌진,박정민,Choi, Heon Jin,Park, Jung Min 한국진공학회 2016 진공 이야기 Vol.3 No.3
Nanowires have excellent properties such as high crystallinity, good mechanical properties, quantum confinement effect and high chemical activity, and thus are promising building blocks for many applications. Here we firstly review the fabrication of nanowires by top-down and bottom-up process. We then review nanowires as building blocks for bio applications including bio sensing, cell signaling and cell stimulating. It shows that nanowires are promising for the development of advanced bio technologies that can address ultrahigh sensitivity, and long term cell signaling and stimulating without cell damages.
개질 유황 고분자가 혼입된 포틀랜드 시멘트 콘크리트의 특성
유승건,최헌진,권혁,박노경,김구대,Yu, Seung-Gun,Choi, Heon-Jin,Kwon, Hyok,Park, No-Kyung,Kim, Goo-Dae 한국결정성장학회 2010 한국결정성장학회지 Vol.20 No.4
일반 포틀랜드 시멘트 콘크리트에 개질 유황 고분자가 혼입되었을 때의 압축강도 및 내염기성의 영향을 일반 포틀랜드 시멘트 콘크리트와 비교하여 나타내었다. 개질 유황이 혼입된 콘크리트는 일반 콘크리트에 비해 매우 큰 강도를 나타내었고, $55^{\circ}C$에서 배합 및 혼합 작업하였을 때 안정적으로 공시체의 제작이 가능하였다. 13%의 $CaCl_2$에 개질 유황이 혼입된 콘크리트 공시체를 침지되어 내염기성을 평가하였다. 내염기성 시험에서, 개질 유황이 혼입된 콘크리트는 $CaCl_2$에 대한 저항성은 일반 콘크리트에 비해 증가하였다. This paper describes the effects of modified sulfur polymer content on the compressive strength and chemical resistance of Portland cement concrete with and without the modified sulfur polymer. The Portland cement concrete which contained modified sulfur had much higher strength than the Portland cement concrete without modified sulfur, workability is stabled at $55^{\circ}C$. Alkali tolerance test was evaluated by immersing these concrete specimens in 13 % $CaCl_2$ solutions. In the alkali tolerance test, the resistance of Portland cement concrete with modified sulfur to $CaCl_2$ increased compared with Portland cement concrete without modified sulfur.
박성태,최병현,지미정,안용태,최헌진,Park, Sung-Tae,Choi, Byung-Hyun,Ji, Mi-Jung,An, Yong-Tae,Choi, Heon-Jin 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.3
Effects on sintering and electrical properties of $La_{0.7}Ca_{0.3}Cr_{0.9}Co_{0.1}O_{3-{\delta}}$ system, a interconnect material for cylindrical and flat tubular solid oxide fuel cells (SOFC), have been investigated by Ca-source when using $CaCO_3$ and $CaF_2$. When using $CaCO_3$ and $CaF_2$ was mixing as Ca-source, single phased perovskite solid solution was observed for each sample. The sintering temperature was decreased by $CaF_2$ contents was increased. When using 0.1 mole $CaF_2$ was densely sintered at $1400^{\circ}C$ and relative density was 93.8%. Also, electrical conductivity in oxidation and reducing atmosphere was 47, 4.3 S/cm, respectively, due to $F^-$ ion enhance the electrical conductivity in reducing atmosphere.
Al-B-C 첨가 탄화규소의 스파크 플라즈마 소결에 의한 미세구조 발달
조경식,이광순,이현권,이상진,최헌진,Cho, Kyeong-Sik,Lee, Kwang-Soon,Lee, Hyun-Kwuon,Lee, Sang-Jin,Choi, Heon-Jin 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.8
Densification of SiC powder with additives of total amount of2, 4, 8 $wt\%$ Al-B-C was carried out by Spark Plasma Sintering (SPS). The unique features of the process are the possibilities of a very fast heating rate and a short holding time to obtain fully dense materials. The heating rate and applied pressure were kept at $100^{\circ}C/min$ and 40 MPa, while the sintering temperature and holding time varied from 1700 - $1800^{\circ}C$ for 10 - 40 min, respectively. The SPS-sintered specimens with different amount of Al-B-C at $1800^{\circ}C$ reached near-theoretical density. The $3C{\rightarrow}6H,\;15R{\rightarrow}4H$ phase transformation of SiC was enhanced by increasing the additive amount. The microstructure of SiC sintered up to $1750^{\circ}C$ consisted of fine equiaxed grains. In contrast, the growth of large elongated grains in small matrix grains was shown in sintered bodies at $1800^{\circ}C$, and the plate-like grains interlocking microstructure had been developed by increasing the holding time at $1800^{\circ}C$. The grain growth rate decreases with increasing amount of Al-B-C in SiC starting powder, however, the both of volume fraction and aspect ratio of large grains in sintered body increased.
TiO<sub>2</sub>/ITO 나노구조체 광전극의 합성 및 염료감응 태양전지에의 적용
김대현,박경수,최영진,최헌진,박재관,Kim, Dae-Hyun,Park, Kyung-Soo,Choi, Young-Jin,Choi, Heon-Jin,Park, Jae-Gwan 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.1
A Sn-doped $In_2O_3$ (ITO) nanowire photoelectrode was produced using a simple metal evaporation method at low synthesis temperature (< $540^{\circ}C$). The nanowire electrodes have large surface area compared with that of flat ITO thin film, and show low electrical resistivity of $5.6{\times}10^{-3}{\Omega}cm$ at room temperature. In order to apply ITO nanowires to the photoelectrodes of dye-sensitized solar cell (DSSC), those surfaces were modified by $TiO_2$ nanoparticles using a chemical bath deposition (CBD) method. The conversion efficiency of the fabricated $TiO_2$/ITO nanostructure-based DSSC was obtained at 1.4%, which was increased value by a factor of 6 than one without ITO nanowires photoelectrode. This result is attributed to the large surface area and superior electrical property of the ITO nanowires photoelectrode, as well as the structural advantages, including short diffusion length of photo-induced electrons, of the fabricated $TiO_2$/ITO nanostructure-based DSSC.
BaCeO<sub>3</sub>가 첨가된 BaZrO<sub>3</sub>의 미세구조 및 수소이온 전도도
박종성,이성명,김동완,이종호,이해원,최헌진,김병국,Park, Jong-Sung,Lee, Sung-Myung,Kim, Dong-Wan,Lee, Jong-Ho,Lee, Hae-Won,Choi, Heon-Jin,Kim, Byung-Kook 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.4
The dense sintered bodies with >95% theoretical densities were successfully obtained from the $BaZrO_3,\;BaCeO_3,\;Ba(Zr_{0.7}Ce_{0.3})O_3$ solid solution, and core-shell structured $0.7BaZrO_3-0.3BaCeO_3$ composite powders prepared by sol-gel methods. The activation energy of $Ba(Zr_{0.7}Ce_{0.3})O_3$ solid solution calculated from the Arrhenius plot of the proton conductivities was similar to that of $BaZrO_3$. The activation energy of core-shell structured $0.7BaZrO_3-0.3BaCeO_3$ composite, however, was much lower than that of $BaZrO_3$ or $Ba(Zr_{0.7}Ce_{0.3})O_3$ solid solution, and was very similar to that $BaCeO_3$. These results could be assigned to the Ce-rich grain boundary which was clearly observed by EDX in core-shell structured $0.7BaZrO_3-0.3BaCeO_3$ composite.
Si<SUB>x</SUB>Ge<SUB>1-x</SUB> 나노선의 열전도도 특성
김형준(Hyoungjoon Kim),김일수(Ilsoo Kim),최헌진(Heon-jin Choi),김우철(Woochul Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
We measured thermal conductivities of silicon germanium (Si<SUB>0.9</SUB>Ge<SUB>0.1</SUB>) nanowires with diameters of 160 and 205㎚ in the temperature range of 40-400K. Result suggests that thermal conductivity reduced as diameter did. Also, thermal conductivity of Si<SUB>x</SUB>Ge<SUB>1-x</SUB> nanowire is lower thermal conductivity than its thin film counter part.
박성태(Park, Sung-Tae),최병현(Choi, Byung-Hyun),지미정(Ji, Mi-Jung),최헌진(Choi, Heon-Jin) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
SOFC cell 하나의 전위차는 약1.1V이기 때문에 발전용으로 사용하기 위해서는 수많은 단전지를 직렬로 연결하는 구조가 필요하다. 이러한 stack의 디자인에서 발생하는 문제를 획기적으로 개선한 형태가 하나의 지지체에 셀을 직렬로 연결함으로 전극의 선폭 및 단위 셀 간의 간격이 기존 평판형, 원통형에 비해 대폭 축소되어 전극 및 연결재의 저항손실을 최소화할 수 있는 Segmented형 SOFC이다. Segmented SOFC에 적용하기 위한 세라믹 다공성 지지체는 연료와 공기에서의 화학적 안정성, 셀의 구성소재와 반응이 없으며 열팽창계수가 유사해야하는 특성을 가져야하는데 그 중에서도 지지체로써 적절한 기계적 강도와 높은 가스투과도가 요구되어진다. 본 연구에서는 고온에서 안정한 Spinel의 MgAl2O4를 주성분으로 하는 다공성 지지체를 압출 성형하여 평관형으로 제조하였으며 활성탄을 기공형성제로 사용하여 연료의 공급이 원활하도록 약 30%의 기공율을 가지는 다공성 세라믹 지지체를 제조하였다. 제조된 세라믹 지지체에 연료극(NiO/YSZ), 전해질(TZ8Y), 공기극(LSM)을 코팅하여 실제 SOFC에 적용이 가능함을 확인하였다.
강종호(Jong-Ho Kang),이명현(Myung-Hyun Lee),서원선(Won-Seon Seo),이석원(Suk-Won Lee),곽태수(Tae-Soo Kwak),최헌진(Heon-Jin Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
We investigated the cell activity of controlled titanium surface using various grinding methods including ELID (Electrolytic In-Process Dressing) grinding method. The influence of titanium surface condition by each grinding process on the cell activity was evaluated by ALP activity of MSC(Mesenchymal Stem Cells). The ALP activity of controlled surface by ELID grinding process using # 2000 wheel was higher than that of other titanium surface. The morphological, chemical properties of machined surface by grinding method was observed using various analytical method.