http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
폴리카보실란으로부터 제조된 탄화규소 중공사의 미세구조제어
신동근,공은배,조광연,권우택,김영희,김수룡,홍준성,류도형,Shin, Dong-Geun,Kong, Eun-Bae,Cho, Kwang-Youn,Kwon, Woo-Tek,Kim, Younghee,Kim, Soo-Ryong,Hong, Jun-Sung,Riu, Doh-Hyung 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.4
SiC hollow fiber was fabricated by curing, dissolution and sintering of Al-PCS fiber, which was melt spun the polyaluminocarbosilane. Al-PCS fiber was thermally oxidized and dissolved in toluene to remove the unoxidized area, the core of the cured fiber. The wall thickness ($t_{wall}$) of Al-PCS fiber was monotonically increased with an increasing oxidation curing time. The Al-PCS hollow fiber was heat-treated at the temperature between 1200 and $2000^{\circ}C$ to make a SiC hollow fibers having porous structure on the fiber wall. The pore size of the fiber wall was increased with the sintering temperature due to the decomposition of the amorphous $SiC_xO_y$ matrix and the growth of ${\beta}$-SiC in the matrix. At $1400^{\circ}C$, a nano porous wall with a high specific surface area was obtained. However, nano pores grew with the grain growth after the thermal decomposition of the amorphous matrix. This type of SiC hollow fibers are expected to be used as a substrate for a gas separation membrane.
Ti-PCS 혼합용액의 전기방사를 통해 제조된 TiO2-SiO2 나노복합 섬유
신동근 ( Dong Geun Shin ),진은주 ( Eun Ju Jin ),이윤주 ( Yoon Joo Lee ),권우택 ( Woo Tek Kwon ),김영희 ( Younghee Kim ),김수룡 ( Soo Ryong Kim ),류도형 ( Doh Hyung Riu ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.3
TiO2-SiO2 나노복합 섬유TiO2-SiO2 나노복합소재는 자체가 화학적으로 안정할 뿐만 아니라 광학적, 열적 특성이 매우 우수 여 광화학센서, 촉매 등 다양한 분야에 적용되고 있다. 이러한 구조를 구현하는 방법으로 티타늄이 첨가된 폴리카보실란(PCS) 혼합용 액을 전기방사한 후 이를 적절한 산화분위기에서 열처리하여 부직포상의 TiO2-SiO2 나노복합섬유를 만들 수 있는데, 이는 기존의 졸겔공정에 의해 제조되는 섬유보다 더 쉽고 안정적인 방법이다. 공정 중 방사된 섬유를 산화분위기에서 1200 °C 이상까지 열처리하게 되면 크리스토발라이트 기지조직 내에서 아나타제 나노결정상이 매우 균일하게 형성되었다. 또 한, 열처리 후 섬유의 표면과 단면은 매우 치밀하고 매끈하였으며 10~20nm 크기의 아나타제 결정입자들이 내부에 균 일하게 분포하였다. Nanostructured TiO2-SiO2 materials have widely been used as anti-reflecting coating, optical-chemical sensors and catalysts because of their superior optical and thermal properties as well as chemical durability. Web type SiO2 microfibers with nano-crystalline TiO2 were prepared by electrospinning of Ti-PCS mixed solution and oxidation controlled heat-treatment, rather simple than sol-gel process. Nano-crystalline anatase phase were formed for the heattreatment up to 1200 °C and they were finely dispersed in the amorphous SiO2 matrix.