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김영독 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Atomic layer deposition (ALD) and temperature-regulated chemical vapor deposition (TR-CVD) have recently been shown to be as effective for insertion of nanoparticles into the mesoporous templates. ALD or TR-CVD, NiO or Fe<sub>2</sub>O<sub>3</sub> nanoparticles could be incorporated into mesoporous SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> substrates and not only the surface topmost part of the substrate particles but also deeper layers with a depth of several tens to hundreds of micrometer could be decorated by NiO or Fe<sub>2</sub>O<sub>3</sub> nanoparticles. These catalysts were shown to be highly active for low temperature CO, acetaldehyde and toluene and resistant against poisoning by SO<sub>2</sub>. More recently, our catalysts have been tested for selective catalytic reduction (SCR), and the result shows activation barrier of our catalysts for SCR is lower than that of commercial SCR catalysts.
Fabrication of heterogeneous catalysts using atomic layer deposition
김영독,김대한,정명근,한상욱,김일희,박은지,황영규 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
We show two different strategies of use of atomic layer deposition for fabricating highly stable heterogeneous catalysts. First, atomic layer deposition can be used for incorporation of catalytically active NiO nanoclusters into mesoporous silica and alumina with a mean pore size of ~ 10-15 nm. Catalytic activity of the supported Ni oxide nanoclusters was tested for CO and toluene oxidation. As a second strategy, we show that atomic layer deposition can provide porous and thin shells wrapping catalytically active nanoparticles, and these shells can inhibit deactivation of catalysts operating under high temperatures (above 800 ℃). As an example, we show that TiO2 and MgO shells on Ni particles can reduce poisoning of these catalysts in CO2 reforming of methane reaction, due to the fact that these shells can inhibit deposition of coke on the surface of Ni catalysts.
탄소나 TiO<sub>2</sub>를 포함한 다양한 흡착제의 휘발성 유기물 흡착에 대한 연구
김영독,Kim, Young-Dok 한국진공학회 2012 Applied Science and Convergence Technology Vol.21 No.2
본 연구에서는 톨루엔 등의 휘발성 유기물의 흡착량을 정성, 정량적으로 연구할 수 있는 새로운 장비를 구축하였으며, 이를 이용하여 기존의 탄소를 기반으로 하는 다양한 흡착제와 원자층 증착으로 만든 $TiO_2$ 박막구조의 톨루엔 흡착에 대한 연구를 진행하였다. $TiO_2$ 박막구조의 흡착제가 기존의 탄소기반 흡착제보다 톨루엔 흡착량이 뛰어난 것을 입증하였으며, 이는 원자층증착으로 제조한 $TiO_2$ 박막 표면의 높은 농도의 OH 그룹의 높은 톨루엔 친화력과 연관성이 있는 것으로 나타났다. 또한 본장비를 이용하여 가역적인 흡착과 비가역적인 흡착을 구분할 수 있음을 보여주었다. New equipment for quantitative and qualitative adsorption of volatile organic compound was set up, and using this equipment, adsorption behaviors of various carbob-based nanomaterials and $TiO_2$ thin films prepared by atomic layer deposition were compared. We could conclud that $TiO_2$ thin films can show higher adsorption capacity of toluene comparing to the carbon-based nanostructures due to higher affinity of the surface OH groups of $TiO_2$ towards toluene adsorption. We also demonstrate that our method allows to discriminate reversible and irreversible adsorptions at a given temperature.
초청 총설 : 원자층 증착을 이용한 친환경 소재의 제조
김영독 ( Young Dok Kim ) 한국공업화학회 2012 공업화학 Vol.23 No.1
본 총론에서는 원자층 증착을 이용한 친환경 소재의 개발에 대한 최근 연구 결과들을 간단하게 소개하려 한다. 원자층 증착의 장점은 박막의 두께를 미세하게 조절할 수 있다는 것과, 3차원적으로 복잡한 구조를 가지는 담체의 형상을 유지하면서 균일한 박막을 제조할 수 있다는 것이다. 이러한 원자층 증착의 장점은 친환경소재를 제조하는 데 중요한 역할을 할 수 있다. Anodic aluminum oxide (AAO)와 같은 다공성 membrane을 담체로 이용하여, 다공성 구조는 그대로 유지하면서 10나노미터 정도의 TiO2박막을 균일하게 증착할 경우 톨루엔 등의 휘발성 유기물 필터로 사용할 수 있는데, 이는 AAO의 특이한 기하학적 구조와 비정질 TiO2의 강한 휘발성 유기물 흡착력의 조합에 의한 결과이다. 톨루엔 분해용 광촉매 및 이산화탄소 개질 반응에 의한 수소 생산 촉매 반응에 있어서도 나노다이아몬드나 니켈 담체 위에 TiO2의 증착량을 미세하게 조절하여 TiO2가 표면을 완전히 덮지 않고 부분적으로만 덮고 있는 구조를 만들 경우 촉매의 효율 및 수명을 극대화할 수 있게 된다. 이러한 예들은 원자층 증착이 기존의 반도체산업뿐만 아니라 환경소재의 개발에도 중요한 도구가 될 수 있음을 의미한다. In this article, I will introduce recent developments of environmental-friendly materials fabricated using atomic layer deposition (ALD). Advantages of ALD include fine control of the thin film thickness and formation of a homogeneous thin fim on complex-structured three-dimensional substrates. Such advantages of ALD can be exploited for fabricating environmental- friendly materials. Porous membranes such as anodic aluminum oxide (AAO) can be used as a substrate for TiO2 coating with a thickness of about 10 nm, and the TiO2-coated AAO can be used as filter of volatile organic compound such as toluene. The unique structural property of AAO in combination with a high adsorption capacity of amorphous TiO2 can be exploited in this case. TiO2 can be also deposited on nanodiamonds and Ni powder, which can be used as photocatalyst for degradation of toluene, and CO2 reforming of methane catalyst, respectively. One can produce structures, in which the substrates are only partially covered by TiO2 domains, and these structures turns out to be catalytically more active than bare substrates, or complete core-shell structures. We show that the ALD can be widely used not only in the semiconductor industry, but also environmental science.
Removal of oil by gelation using hydrophobic silica nanoparticles
조연경,김영독,박은지 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Silica nanoparticles are coated by polydimethysiloxane (PDMS) thin film using chemical vapor deposition and the PDMS-coated silica nanoparticles are shown to be highly hydrophobic. These PDMS-coated silica nanoparticles are used for selectively gelating oils in the oil/water mixture, allowing easy separation and removal of oil from water. Hydrophobized silica nanoparticles are shown to be able to gelate rotary pump oil with its mass 15 times higher than that of silica. A gelated mixture of oil and hydrophobized silica is stable and not dispersed in water for 7 days.
Electrochemical conversion of carbon dioxide in a solid oxide electrolysis cell
엄성현,김영독 한국물리학회 2014 Current Applied Physics Vol.14 No.5
Carbon dioxide is one of the greatest concerns worldwide, since it is not only a major greenhouse gas but also expected to be an important, sustainable resource for fuels and chemicals. The electrochemical conversion of carbon dioxide, based on solid electrolyte membrane reactors, has the promise to overcome the limitations of the conventional catalytic reactors such as the limited conversion and kinetics, relatively low selectivity and high energy consumption. In this review, electrocatalysts and solid oxide electrolytes, both proton and oxide ion conductors as core materials in an electrochemical ceramic membrane reactor have been reviewed and particular emphasis is placed on their application to synthesize carbon monoxide and hydrogen.