• 공업화학
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• 제33권5호
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• pp.523-531
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• 2022

A NiCo-metal organic framework (MOF) electrode, prepared using urea as a surfactant, was synthesized using a one-pot hydrothermal method. The addition of urea to the NiCo-MOF creates interstitial voids and an ultra-thin nanostructure in the NiCo-MOF, which improves its charge transfer performance. We obtained the optimal metal to surfactant ratio to achieve the best specific capacitance. The NiCo-MOF was employed as the working electrode material in a three-electrode system. Field emission scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy were employed to characterize the microstructures and morphologies of the composites. Cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy curves were employed to quantify the electrochemical properties of the electrodes in a 6 M KOH electrolyte.

• 공업화학전망
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• 제23권3호
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• pp.1-16
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• 2020

식품 산업에서 제품의 품질을 향상시키기 위해서는 약한 세기의 맛에서도 다양한 종류의 맛을 감지해낼 수 있어야만 한다. 이러한 목적 달성을 위해서 2차원 물질과 금속유기골격체(metal-organic framework, MOF)를 이용한 미각 감지 센서에 대한 연구들이 한창 진행 중이다. 2차원 물질 및 MOF는 고유한 특성으로 인하여 현재 다양한 분야에서 많은 관심을 받아오고 있으며 화학 및 생화학 감지 등 다양한 분야에서도 응용될 수 있다. 본 기고문에서는 미각 감지 응용에서 2차원 물질과 MOF의 최신 연구동향을 다루고자 한다. 본 기고문을 통하여 미각 감지 응용 분야에서 2차원 물질과 MOF의 작용 메커니즘을 이해하고 현재의 연구 현황 및 앞으로의 발전 방향을 알아보고자 한다.

• 한국응용과학기술학회지
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• 제37권5호
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• pp.1200-1207
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• 2020

본 연구에서는 다공성 활성탄소와 금속유기골격체 복합재료 기반의 전극 재료와 "이온젤" 이라고 불리는 고분자 고체 전해질을 이용하여 슈퍼커패시터를 제작 하였으며, 금속유기골격체의 함량에 따른 전기화학적 거동을 관찰하여 보았다. 슈퍼커패시터의 전기화학적 특성은 순환전압전류법(CV), 전기화학적 임피던스 분광법(EIS) 및 전정류 충·방전법(GCD)으로 분석하였으며, 그 결과로, 다공성 활성탄소 대비 금속유기골격체를 0.5 wt% 첨가 하였을 때 가장 높은 전기용량값을 확인 할 수 있었으며, 0.5 wt% 이상의 금속유기골격체의 함유량은 전기화학적 특성 감소에 영향을 주는 것으로 사료되며, 이러한 결과를 바탕으로 제조된 다공성 활성탄소/금속유기골격체 복합재료 기반의 슈퍼커패시터는 다양한 분야에 활용이 가능할 것으로 판단된다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 춘계학술대회
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• pp.9-12
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• 2006

We performed molecular dynamics simulations on the conventional MOF, IRMOF-14 and the catenated MOF with two MOF chains, IRMOF13, to find out rational design and synthetic strategies toward efficient hydrogen storage materials. The molecular dynamics calculations were done using Universal force fields and the analysis of result was performed during the NVE dynamics after preliminary NVT dynamics at 77K. The results showed the density of adsorbed hydrogen molecules was increased in the various pores created by catenation of MOFs while the large amount of volume in conventional MOF was not effectively utilized to store hydrogen. Those calculation results commonly showed the proper control of pore si Be for hydrogen storage into MOF by catenation would be one of the efficient ways to increase hydrogen capacity of MOFs.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.316-325
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• 2018

Aluminum based metal-organic framework using a di-carboxylate linker succinic acid (Al-SA MOF), are synthesized in water with minimal generation of secondary pollutants. The physicochemical properties of Al-SA MOF were examined, followed by its utility for the adsorption of Acid Black 1 (AB1) in aqueous media. Influences of key parameters such as pH, contact time, initial AB1 concentration,temperature, and selectivity on the adsorption process were assessed. A series of adsorption mechanisms are proposed, which involve electrostatic, hydrogen bonding, and hydrophobic interactions. These findings suggest that Al-SA MOF is a potent candidate in removing complex azo dyes molecules from aqueous media.

• 멤브레인
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• 제25권6호
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• pp.465-477
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• 2015

최근 에너지 효율이 높은 분리 공정기술의 수요가 증가하면서 분리막을 이용한 기체 분리가 큰 관심을 모으고 있다. 현재 분리막에 의한 기체 분리 시장은 고분자막이 독점하고 있으며, 고분자 재료 물성의 한계로 탄화수소와 같은 응축 기체분리 보다는 비응축 기체 분리에 제한되고 있다. MOF 재료는 금속 이온과 유기 리간드가 결합하여 형성하는 결정성 나노 기공 구조로, 높은 비표면적과 기공 구조 제어, 기능성 부여가 가능해 분리막 재료로 큰 관심을 끌고 있다. 본 총설에서는 다양한 MOF 분리막의 합성 방법과 MOF 분리막을 통한 기체 분리 응용에 대해 살펴보고자 한다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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• pp.634-637
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• 2005

Hydrogen adsorption mechanism onto the porous metal-organic frameworks (MOFs) has been studied by density functional theory calculation. The selected functionals for the predict ion of interact ion energies between hydrogen and potential adsorption sites of MOF was utilized after the evaluation with the various functionals for interaction energy of $H_2C_6H_6$ model system the adsorption energy of hydrogen molecule into MOF was investigated with the consideration of the favorable adsorption sites and the orientations. We also calculated the second favorable adsorption sites by geometry optimization using every combination of two first absorbed hydrogen molecules. Based on the calculation of first and second adsorption sites and energies, the hydrogen adsorption into MOF follows a cooperative mechanism in which the initial metal sites initiate the propagation of the hydrogen adsorption on the whole frameworks. In addition, it was found that the interaction strength between the simple benzene ring with hydrogen is significantly reinforced when the benzene ring has been incorporated into the framework of MOFs.

• 한국결정성장학회지
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• 제32권6호
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• pp.225-230
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• 2022

p-XBP4 (N,N'-p-phenylenedimethylenbis(pyridin-4-one)), Cs₃[W(CN)₈]와 Tb(NO₃)₃·6H₂O를 사용하여 2차원의 이중 상호 침투 구조를 갖는 새로운 Tb-MOF인 [Tb(p-XBP4)_2.5(H₂O)₂]·W(CN)₈를 합성하였다. 단결정 X선 회절 분석법으로 얻어진 구조 정보를 통해 Tb-MOF는 이중 상호 침투된 독특한 2차원 구조임을 확인하였다. 또한, 적외선 분광 분석법, 단결정 및 분말 X-선 회절 분석법을 활용하여 추가적인 특성 분석을 수행하였다. Tb-MOF가 갖는 자성 특성과 분자 자석으로서의 거동 가능성을 조사하기 위해, 직류 자화율 및 교류 자화율을 측정하고 이를 분석하였다.

• 센서학회지
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• 제32권3호
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• pp.147-153
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• 2023

Metal-organic frameworks (MOFs) of cobalt gallate were synthesized and deposited on gold electrodes using self-assembly monolayers (SAMs) and hydrothermal processing. These MOF films exhibit strong adsorption capabilities for gaseous particulates, and the use of SAMs allows the synthesis and deposition processes to be completed in a single step. When cobalt gallate is mixed with SAMs, a coordination bond is formed between the cobalt ion and the carboxylate or hydroxyl groups of the SAMs, particularly under hydrothermal conditions. Additionally, the quartz crystal microbalance (QCM) gas sensor accurately measures the number of particulates adsorbed on the MOF films in real-time. Thus, the QCM gas sensor is a valuable tool for quantitatively measuring gases, such as SO₂, NO₂, and CO₂. Furthermore, the QCM MOF film gas sensor was more effective for gas adsorption than the MOF particles alone and allowed the accurate modeling of gas adsorption. Moreover, the QCM MOF films accurately detect the adsorption-desorption mechanisms of SO₂ and NO₂, which exist as gaseous particulate matter, at specific gas concentrations.

• 공업화학
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• 제34권5호
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• pp.556-565
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• 2023

Fast industrial and agricultural expansion result in the production of heavy metal ions (HMIs). These are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompts the development of novel materials. In the present study, a UIO-66 (COOH)₂ metal-organic framework (MOF) containing free carboxylic acid groups was post-synthetically modified with L-glutamic acid via the solid-solid reaction route. Pristine and glutamic acid-treated MOF materials were characterized in detail using several physicochemical techniques. Single-ion batch adsorption studies of Pb(II) and Hg(II) ions were carried out using pristine as well as amino acid-modified MOFs. We further examined parameters that influence removal efficiency, such as the initial concentration and contact time. The bare MOF had a higher ion adsorption capacity for Pb(II) (261.87 mg/g) than for Hg(II) ions (10.54 mg/g) at an initial concentration of 150 ppm. In contrast, an increased Hg(II) ion adsorption capacity was observed for the glutamic acid-modified MOF (80.6 mg/g) as compared to the bare MOF. The Hg(II) ion adsorption capacity increased by almost 87% after modification with glutamic acid. Fitting results of isotherm and kinetic data models indicated that the adsorption of Pb(II) on both pristine and glutamic acid-modified MOFs was due to surface complexation of Pb(II) ions with available -COOH groups (pyromellitic acid). Adsorption of Hg(II) on the glutamic acid-modified MOF was attributed to chelation, in which glutamic acid grafted onto the surface of the MOF formed chelates with Hg(II) ions.