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초음파 중합에 의한 polypyrrole 나노입자를 함유하는 메조포러스 TiO<sub>2</sub> 박막의 합성
정광석,조성호,송명근,김종득,Jang, Kwang-Suk,Cho, Sung-Ho,Song, Myung-Geun,Kim, Jong-Duk 한국화학공학회 2008 Korean Chemical Engineering Research(HWAHAK KONGHA Vol. No.
Using ultrasonic-induced polymerization of pyrrole, mesoporous $TiO_2$ thin film with polypyrrole nanoparticles was prepared. Polypyrrole nanoparticles were ultrasonically synthesized in the mother solution of mesoporous $TiO_2$ before spin-coating. The polypyrrole particles were well dispersed in the solution. After spin-coating and calcinations process, the nanocomposite films have well-organized pore channels without pore-collapse, and polypyrrole nanoparticles are well dispersed in mesoporous $TiO_2$ matrix. The pore size and light absorbance of the mesoporous nanocomposite thin films were controlled by using different template materials, and by using different amount of pyrrole monomer, respectively. 초음파 중합법을 이용하여 pyrrole을 중합시킴으로써 polypyrrole 나노입자를 합유하는 메조포러스 $TiO_2$ 박막을 합성하였다. 메조포러스 $TiO_2$ 박막을 만들기 위한 $TiCl_4$-계면활성제 용액에 pyrrole을 넣어주고 초음파 중합시킴으로써 용액 내에 polypyrrole 나노입자들이 잘 분산된 형태로 만들어졌다. 이 용액을 이용하여 spin-coating과 열처리를 함으로써 polypyrrole 나노입자를 합유하는 메조포러스 $TiO_2$ 박막을 제조하였다. 열처리 후에도 기공 구조는 잘 유지되었으며, polypyrrole 나노입자들이 박막 내에 잘 분산되었다. 주형물질인 계면활성제의 종류와 pyrrole의 양을 조절함으로써, 합성된 박막의 기공 크기와 빛의 흡광도를 조절하였다.
Synthesis of Organized Mesoporous TiO_2 Thin Film and its Application to Photovoltaic Cell
Song, Myung-Geun,Kim, Hyun-Wuk,Kim, Jong-Duk 한국공업화학회 2003 응용화학 Vol.7 No.1
The mesoporous TiO_2 thin film was synthesized by spin-coating method from C_16EO_20 as a struchure-directing agent. The mesophase was strongly affected by the solvent evaporation period, exhibiting the best stuctural integrity after 3 dauys of aging at 40℃ in open beaker. The XRD pattem and TEM image showed that a well-ordered cylindrical pore structures were formed, which can be indexed in a 2D hexagonal(ρσm) or 2D centered-rectangular cell(c2m) in the direction normal to surface. The UV/Vis. absorbance of mesostructured TiO_2 film was larger in short wavelength below 300nm than that of amorphous film Moreover the photocurent response of mesostructured TiO_2 film was larger than amorphous film which indicates that high surface area,structural regularity of mesophase, which the distinct order on mesoscopis scale(long range) of titania is affect somewhat to the photoelcctronic property as well as order on the atomic sccalc(short range).
Sodium stearate 와 칼슘 이온이 흡착된 침강성 탄산칼슘의 정전기적 성질과 유변학적 물성에 관한 연구
김종윤,김종득,송명근 한국공업화학회 1997 응용화학 Vol.1 No.2
본 연구에서는 수용상에서 stearate와 칼슘이온이 침강성 탄산칼슘의 유변학적인 물성과 정전기적 성질에 미치는 영향을 조사하였다. 3.3% 탄산칼슘 suspension에 1:1의 몰비율로 stearate와 칼슘이온을 흡착시킨 결과, 칼슘이온의 흡착으로 인하여 제타 포텐셜이 양의 영역으로 전이되며, 이온성 계면활성제의 흡착으로 인해 나타나는 PZC(point of zero charge)의 경우 칼슘이온의 영향으로 인하여 sodium stearate만이 흡착된 탄산칼슘 suspension에 비해 고농도에서 나타나게 된다. 탄산칼슘 suspension의 yield value값은 입자의 제타 포텐셜과 서로 반비례하는 경향성을 보이는데, 이는 sodium stearate가 흡착한 suspension계에서의 분산 안정성은 정전기적 반발력이 주된 것임을 보여준다. The effect of sodium stearate and calcium ions on the zeta potential and rheological properties of aqueous calcium carbonate suspensions was studied. The zeta potential of 3.3wt% calcite suspension adsorbed with sodium stearate and calcium ion with 1:1 mole ratio exhibited complex trend with sodium stearate concentration and the transition toward the positive value compared with the calcium carbonate suspensions adsorbed with sodium stearate only. The concentration of stearate at PZC(point of zero charge) of calcium carbonate adsorbed with sodium stearate and calcium ion was higher than that of calcium carbonate suspension adsorbed with sodium stearate only. The yield values of suspensions showed the reverse trend to zeta potential and this confirms that electrostatic repulsion force between calcium carbonate particles is the main effect to dispersion stability in aqueous medium.
수용상에서 알칼 폴리글리코사이드가 흡착된 침강성 탄산칼슘의 분산 안정성에 관한 연구
김종윤,김종득,송명근 한국공업화학회 1998 응용화학 Vol.2 No.1
The electrostatic and dispersion properties of precipitated calcium carbonate suspension adsorbed with alkyl polyglycoside were investigated. The pH of suspension was adjusted to 6, 8, and 12 to investigate the effect of suspension pH on adsorption of APG surfactant onto calcium carbonate particle. The adsorption amount of APG onto calcium carbonate particle was exhibited to depend on surface charge of particle. The higher surface charge, the more amount of APG was adsorbed onto particle surface and by the adsorption of APG molecules, the surface potential of calcium carbonate particle was markedly decreased. In low APG concentration, the dispersion stability of suspension does not show a relationship with zeta potential at all suspension pH and exhibits very poor stability. This indicates that the hydrophobic interaction among particles caused by hydrophobic surface property destabilizes the suspension, and this destabilization region continued to monolayer coverage of sufactant layer. After this monolayer saturation, the adsorption amount abruptly increases caused by formation of admicelles or bilayer of surfactant on surface. Up to this monolayer surface concentration, the dispersion stability shows proportionality with zeta potential.
연료유 / 물 시스템에서의 알킬 폴리글리코사이드의 유효도
김종윤,김종득,김태성,송명근 한국공업화학회 1998 응용화학 Vol.2 No.1
As an environment-friendly surfactant alkyl polyglycosides(APG) -or allkyl polyglucosides have become very attractive due to its excellent surface activity as well as mildness and good biodegradability[1]. In our study, dispersibility of system comprised of alkyl polyglycoside as a surfactant, fuel oil as an oil phase and sea water as a water phase was investigated with the surfactant concentration and its formulation.