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실리카 나노 필러의 표면 처리 최적화를 통한 고분자 치아수복재의 제조와 기계적 물성
김오영(Oh Young Kim),이태정(Tae Jung Lee),공명선(Myoung Seon Gong) 한국공업화학회 2002 공업화학 Vol.13 No.3
최근 치과용 수복 재료로 널리 이용되고 있는 고분자계 치아 수복재(polymeric dental restorative composite, PDRC)의 기계적 성질을 좌우하는 요소 중의 하나인 필러의 표면 처리 최적화를 통해 고품격의 PDRC를 제조하고 이들의 기계적 물성을 분석하여 고찰하였다. 친수성을 가진 크기가 40 nm인 실리카 nanofiller의 소수성 표면 처리에 사용된 결합제는 γ-methacryloylpropyltrimethoxysilane(γ-MPS)로서 필러를 기준으로 각각 0, 5, 8, 10, 20 wt%까지 변화시켜 표면 처리 최적화 실험에 사용하였으며 적외선분광분석과 표면 접촉각 측정을 통해 표면 처리된 필러의 소수성을 평가하였다. 각기 다른 γ-MPS 농도로 처리된 실리카 nanofiller를 사용하여 제조한 PDRC의 기계적 물성을 평가한 결과 10 wt% γ-MPS를 사용한 경우가 가장 최적의 간접인장강도와 굴곡강도 값을 나타냄을 알 수 있었다. The preparation of novel functional polymeric dental restorative composite (PDRC) was carried out using fumed silica nanofiller. To optimize the surface properties of hydrophilic silica nanofiller having a diameter of 40 nm, its surface was treated with a variety of concentrations of γ-methacryloxypropyltrimethoxysilane(γ-MPS) coupling agent; from 0 to 5, 8, 10, and 20 wt% of the nanofiller. Effect of γ-MPS content on the hydrophobic characteristics of silica nanofiller was investigated using fourier transform infrared spectroscopy and surface contact angle measurement. Mechanical properties of PDRC that was prepared by γ-MPS treated silica nanofiller were also measured. Results of diametral tensile strength and flexural strength measurements showed that optimum concentration of γ-MPS was at 10 wt% of silica nanofiller.
Stacked GDI602(691)/GDI602(Rubrene) 형광층을 갖는 2-파장 유기발광소자
장지근,장호정,오명환,강정원,이준영,공명선,이영관,김희원,Jang, Ji-Geun,Chang, Ho-Jung,Oh, Myung-Hwan,Kang, Jung-Won,Lee, Jun-Young,Gong, Myoung-Seon,Lee, Young-Kwan,Kim, Hee-Won 한국재료학회 2007 한국재료학회지 Vol.17 No.4
A new organic light emitting device(OLED) with two peak wavelength(blue and yellow) emission was fabricated using the selective doping in a single fluorescent host , and its electrical and optical characteristics were investigated. The fabricated device showed the luminance and efficiency of 1600 $Cd/m^2$ and 2.4 Im/W under the applied voltage of 10V, respectively. And its electroluminescent spectra had two peak wavelengths of 470nm and 560nm emitting bluish white light. The OLED with dual wavelength emission in this experiment is likely to be developed as a white OLED with simpler fluorescent system than conventional devices.
Cross-Linked PVP 게이트 유기 박막트랜지스터
장지근,오명환,장호정,김영섭,이준영,공명선,이영관,Jang Ji-Geun,Oh Myung-Hwan,Chang Ho-Jung,Kim Young-Seop,Lee Jun-Young,Gong Myoung-Seon,Lee Young-Kwan 한국마이크로전자및패키징학회 2006 마이크로전자 및 패키징학회지 Vol.13 No.1
유기 박막트랜지스터(OTFTs)제작에서 PVP-게이트 절연막의 형성과 처리가 소자성능에 미치는 영향을 조사하였다. 유기 게이트 용액의 제조에서는 polyvinyl 계열의 PVP(poly-4-vinylphenol)를 용질로, PGMEA (propylene glycol monomethyl ether acetate)를 용매로 사용하였다. 또한 열경화성 수지인 poly(melamine-co-formaldehyde)를 경화제로 사용하여 유기 절연막의 cross-link를 시도하였다. MIM 시료의 전기적 절연 특성을 측정한 결과, PVP-기반 유기 절연막은 용액의 제조에서 PGMEA에 대한 PVP와 poly (melamine-co-formaldehyde)의 농도를 증가시킬수록 낮은 누설전류 특성을 나타내었다. OTFT 제작에서는 PGMEA에 대해 PVP를 20 wt%로 섞은 PVP(20 wt%) copolymer와 5 wt%와 10 wt%의 poly(melamine-co-formaldehyde)를 경화제로 추가한 cross-linked PVP(20 wt%)를 게이트 유전 재료로 사용하였다. 제작된 트랜지스터들에서 전계효과 이동도는 5 wt % cross-linked PVP(20 wt%) 소자에서 $0.31cm^2/Vs$로, 그리고 전류 점멸비는 10 wt% cross-linked PVP(20 wt%) 소자에서 $1.92{\times}10^5$으로 가장 높게 나타났다. The preparation and processing of PVP-gate insulators on the device performance have been studied in the fabrication of organic thin film transistors (OTFTs). One of polyvinyl series, poly-4-vinyl phenol(PVP) was used as a solute and propyleneglycol monomethyl etheracetate(PGMEA) as a solvent in the formation of organic gate solutions. The cross-linking of organic insulators was also attempted by adding the thermosetting material, poly (melamine-co-formaldehyde) as a hardener in the compounds. From the measurements of electrical insulating characteristics of metal-insulator-metal (MIM) samples, PVP-based insulating layers showed lower leakage current according to the increase of concentration of PVP and poly (melamine-co-formaldehyde) to PGMEA in the formation of organic solutions. The PVP(20 wt%) copolymer with composition of 20 wt% PVP to PGMEA and cross-linked PVPs in which 5 wt% and 10 wt% poly (melamine-co-formaldehyde) hardeners had been additional]y mixed into PVP(20 wt%) copolymers were used as gate dielectrics in the fabrication of OTFTs, respectively. In our experiments, the maximum field effect mobility of $0.31cm^2/Vs$ could be obtained in the 5 wt% cross-linked PVP(20 wt%) device and the highest on/off current ratio of $1.92{\times}10^5$ in the 10 wt% cross-linked PVP(20 wt%) device.
GDI 호스트-도펀트 형광체를 이용한 청색 OLED의 제작과 특성 평가
장지근,신세진,강의정,김희원,장호정,오명환,김영섭,이준영,공명선,이영관,Jang, Ji-Geun,Shin, Se-Jin,Kang, Eui-Jung,Kim, Hee-Won,Chang, Ho-Jung,Oh, Myung-Hwan,Kim, Young-Seop,Lee, Jun-Young,Gong, Myoung-Seon,Lee, Young-Kwan 한국재료학회 2006 한국재료학회지 Vol.16 No.4
The blue emitting OLEDs using GDI host-dopant phosphors have been fabricated and characterized. In the device fabrication, 2-TNATA [4,4',4'-tris(2-naphthylphenyl-phenylamino)- triphenylamine] as a hole injection material and NPB [N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine] as a hole transport material were deposited on the ITO(indium thin oxide)/glass substrate by vacuum evaporation. And then, blue color emission layer was deposited using GDI602 as a host material and GDI691 as a dopant. Finally, small molecule OLEDs with structure of ITO/2-TNATA/NPB/GDI602:GDI691/Alq3/LiF/Al were obtained by in-situ deposition of Alq3, LiF and Al as the electron transport material, electron injection material and cathode, respectively. Blue OLEDs fabricated in our experiments showed the color coordinate of CIE(0.14, 0.16) and the maximum power efficiency of 1.1 lm/W at 11 V with the peak emission wavelength of 464 nm.