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서동수,김효중,조준형,서태수 ( Dong Soo Suh,Hyo Joong Kim,Jun Hyung Cho,Tae Soo Suh ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.3
This study was undertaken to establish an industrial process for the preparation of low-soda alumina useful in the manufacture of electronic ceramics. First, starting material, Al(OH)₃, was admixed with the chlorine-containing compounds, NH₄Cl or HCl, employed as the treating agent for reducing the soda in starting material, and then admixture was calcined at a temperature sufficient to eliminate the soda as a volatilizable compound which was produced by reaction of the soda and the above mentioned treating agents. This treatment is so-called the volatilization method. The results obtained in the study show that addition amount of treating agents has an enormous effect on the elimination of soda, and that optimum addition amount of NH₄Cl and HCl is 2.43 and 8.38(mole of treating agent/mole of Na₂O), respectively.
김효중(Hyo Joong Kim),곽중협(Chung Heop Kwak),서태수(Tae Soo Suh),서동수(Dong Soo Suhr) 한국공업화학회 2002 공업화학 Vol.13 No.3
주형법과 biomimetic process를 혼합한 새로운 방법으로 균일한 티타니아 나노튜브를 합성하였다. 본 합성법은 주형표면에 슬폰기를 갖는 유기자기조립박막의 형성, 티탄 락테이트에 의한 티타니아 피복 및 주형제거 과정으로 구성되어 있다. 광전자 분석을 통해 주형인 나노다공성 알루미나 멤브레인(alumina membrane) 표면애 유기 자기조립 박막과 티타니아 피복이 원활히 형성되었음 확인할 수 있었다. 합성된 티타니아 나노튜브는 티탄과 산소의 조성으로 되어 있었으며 전자현미경으로 관찰된 나노튜브의 직경은 대부분 약 200nm 정도의 크기로 주형의 동공경과 동일한 양상을 보임이 관찰되었는데, 이는 합성 티나니아 나노튜브의 직경을 주형의 동공크기로 원활히 제어할 수 있음을 나타내며 이러한 결과들을 통해 본 연구에서 시도한 새로운 합성법이 나노구조체 합성에 적용 가능함을 확인할 수 있었다. Uniform titania nanotubes were prepared by means of combining biomimetic process and template method Synthetic method consisted of the following main steps; The formation of organic self-assembled mono-layers(SAMs) bearing sulfonate functional group onto template surface, the deposition of titania with titanium lactate and the removal of template. XPS results showed that self-assembled monolayers and titania films were successfully prepared on the surface of nanoporous alumina membrane, and it was found that nanostructures were composed of titanium and oxygen. Transmission electron microscopy images confirmed that the diameter of nanotubes, mainly in the range of about 200 nm, correspond to that of the templates, which provides a promising way to control the diameters of the titania nanotubes. The above results confirmed that the proposed technique in this study can be used as a new method to fabricate nanostructures.
분체공학 , 유동층 고분자 , 재료 ( 무기 , 유기 ) : 주형을 이용한 티타니아 나노구조체 합성
김효중(Hyo Joong Kim),곽중협(Chung Heop Kwak),서태수(Tae Soo Suh),서동수(Dong Soo Suhr) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.3
A novel technique for synthesis of titania nanostructures with needle-like template, hydroxyapatite, having particle size of nanometer diameter was investigated in this study. The synthetic routes involve the preparation of nanoprecursor(silica-coated templates), calcination of nanoprecursor and removal of templates. The analysis of nanoprecursor by means of scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) showed that titania particles were successfully deposited onto the surface of templates. Considering the chemical shift of binding energy of Ti 2p_(3/2) on the titania-coated template, it was inferred that TiO_2 in the coating thin-film is combined onto template surface through chemical bond. TEM images of tiatnia nanostructures showed that the formation of uniform titania nanostuuctures was dependent on the addition amount of water. The diameters of the synthesized nanostructures, mainly in the range of 50-200㎚, correspond with the diameters of the templates. The results confirm that the proposed technique in this study can be utilized as a new method to fabricate the nanostructures.
분체공학 , 유동층 고분자 , 재료 ( 무기 , 유기 ) : 주형을 이용한 실리카 나노구조체 합성
김효중(Hyo Joong Kim),곽중협(Chung Heop Kwak),서태수(Tae Soo Suh),서동수(Dong Soo Suhr) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.3
A novel technique for the synthesis of silica nanostructures with needle-like template, hydroxyapatite, having nanometer diameter was investigated in this study. The synthetic method consisted of the following main steps: the preparation of nanoprecursor(silica-coated templates), the calcination of nanoprecursor and the removal of templates. The analysis results of scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photo-electron spectroscopy(XPS) for nanoprecursor revealed that silica particles were deposited onto the surface of templates. Further examinations(curve-fitting processing) of the asymmetrical broadening of O 1s peaks in the XPS spectra indicate the presence of multiple oxygen species on the surface. Energy dispersive X-ray spectroscopy(EDS) result confirmed that nanostructures were composed of silicon and oxygen. The diameters of the synthesized nanostructures, mainly in the range of 50-200㎚, correspond to the diameters of the templates. The results confirm that the proposed technique in this study can be utilized as a new method to fabricate the nanostructures.