• Journal of Adhesion and Interface
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• v.25 no.2
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• pp.50-55
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• 2024

Hydrogen is attracting much attention as a renewable energy source with high energy density and environmental friendliness. Among various hydrogen production methods, water electrolysis stands out as a clean hydrogen production technique that could lead the future of hydrogen production, as it does not emit carbon, and many studies are currently underway to realize this technology. However, the high overpotential, which increases the cost of hydrogen production, acts as a stumbling block, making the development of electrocatalysts extremely important. This paper aims to summarize and introduce recent research trends in the development of electrocatalysts for hydrogen evolution reaction and oxygen evolution reaction through interfacial engineering, and to deeply discuss the challenges in implementing next-generation water electrolysis devices.

• Journal of Adhesion and Interface
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• v.23 no.3
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• pp.59-69
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• 2022

In composite materials, the adhesion and interfacial properties were the most important factors to obtain high performance of mechanical properties. This review paper had been focused on the micromechanical evaluation methods for the interfacial property historically. The interfacial property of fiber-reinforced composites (FRC) could be evaluated using only a single fiber and matrix via various micromechanical testing methods. Self-sensing due to the fracture behavior of FRC could be determined and discussed more critically and clearly using electro-micromechanical evaluation. In this paper, the research trends for micro-mechanical evaluation of composites was summarized, and their practical applications would be suggested in the future.

• Applied Chemistry for Engineering
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• v.26 no.3
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• pp.259-264
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• 2015

For the enhanced oil recovery, one of the most important factors is to determine the surfactant formulation in chemical flood. The objective of this study is to analyze the microemulsion formed between the alkali-surfactant (AS) solution and A crude oil for screening surfactants. The alkali-surfactant solution was manufactured by using the surfactant purchased from AK ChemTech. $C_{16}-PO_7-SO_4$ and sodium carbonate solution were used as surfactant and alkaline, respectively. Both TEGBE and IBA were used as a co-solvent. The AS solution and A crude oil can form a Type III middle phase microemulsion at the salinity from 0.0 wt%~3.6 wt%. Increasing the salinity causes the phase transition of microemulsion from the lower (Type I) to middle (Type III) to upper (Type II) phase. Interfacial tension (IFT) values calculated by Huh's equation were in good agreement with ultralow IFT. According to this characteristic, the surfactant purchased from a domestic company can be applied to the enhanced oil recovery.

• Journal of Adhesion and Interface
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• v.13 no.4
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• pp.182-187
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• 2012

In making emulsion-type pressure sensitive adhesive (PSA), environmentally friendly sorbitan nonionic surfactants having various chemical structures were prepared and used to find out the possibility of substituting the traditional nonyl-phenyl nonionic surfactant (NPE40) by comparing their adhesive properties. Results exhibited that the PSA used NSR10-series and Tween 60 showed better adhesive properties in initial ball tack, peel strength and holding power than those of NPE40. The reason for this is their particular chemical structure and the proper ratio of hydrophobic groups to the ethylene oxide groups.

• Journal of the Korean Vacuum Society
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• v.2 no.3
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• pp.339-345
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• 1993

계면의 원자구조와 전자특성간의 상관성을 연구하기 위하여 GaAs-Ge(AlAs) 이종접합에서 전자의 국소상태밀도(LDOS)를 계산하였다. 본 연구에서는 tight-binding recursion 방법을 기초로 하여 계면의 국소상태밀도로부터 band-offsets, 계면형성에너지, 계면결합의 bond order 등을 연구하는 보다 편리한 방법을 제시하였다.

• Resources Recycling
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• v.5 no.4
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• pp.3-10
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• 1996

• Journal of Adhesion and Interface
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• v.20 no.1
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• pp.29-35
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• 2019

• Journal of the Korean Applied Science and Technology
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• v.16 no.1
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• pp.1-14
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• 1999

계면활성제는 수용액에서 미셀을 형성함에 있어서 자기확산이 분자 운동과 상변화에 대하여 자세한 정보를 제공하고 공업적으로 응용할 수 있는 기술이 점차 증가하고 있다. 계면활성제가 미셀을 형성함에 있어 자기확산 정도는 화학구조의 변화성과 상호 결합 및 회합현상에 매우 민감한 것은 사실이다. 특히 계면활성제 용액의 넓은 범위의 분자 시스템과 콜로이드 상태의 변화성은 다향한 물리, 화학적 성질에 기여됨이 많다. 더욱이 미셀 형성에서 자기확산 계수는 분자 치환에 직간접적으로 상호관계가 있어 NMR 분광학에서 스핀 이완속도의 해석과 분자의 재배열, 스핀 이완에 대한 모델선정 등에 많은 관심을 갖는다. 그중 미셀형성에 있어서 자기확산에 대한 측정 방법중 가장 많이 이용되고 있는 Fourier Transform Pulsed Gradient Spin Echo(FT-PGSE) 측정법은 계면활성제의 미셀형성에 대한 상변화성 및 물리, 화학적 성질을 다루는데 새로운 도구로 제공되고 있다. 이는 이 계통의 기술적 측정방법에 있어서 적절한 개선과 새로운 응용분야를 확장하는데 있어서 많은 가능성을 갖고있다. 그리하여 이들에 대한 역사적 배경과 기초적인 이론을 가지고 미셀 형성에 있어 자기확산에 대한 개념을 말하고 그에 대한 응용성을 계통적으로 설명하고자 한다.

• Journal of Adhesion and Interface
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• v.22 no.3
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• pp.79-84
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• 2021

Graphene has been received a lot of attention as essential parts of future electronic and energy devices. Because of its extraordinary properties contributed from the atomic layer, the interface and surface engineering of graphene are promising approaches for realizing 2D materials-based high-performance devices. Herein, we summarize and introduce recent research trends of the synthesis of graphene through interface engineering for high-performance electronic and energy device applications, and then discuss the challenges and opportunities for achieving high-performance devices in next-generation electronics.

• Proceedings of the SCSK Conference
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• 2004.09a
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• pp.9-41
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• 2004