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Kim, Byoung-Joon,Shin, Hae-A-Seul,Lee, Ji-Hoon,Yang, Tae-Youl,Haas, Thomas,Gruber, Patric,Choi, In-Suk,Kraft, Oliver,Joo, Young-Chang Cambridge University Press (Materials Research Soc 2014 Journal of materials research Vol.29 No.23
<▼1><B>Abstract</B><P/></▼1><▼2><P>The thickness dependence of the electrical stability under monotonic and cyclic tensile loading is investigated for Cu films on polymer substrates. As for monotonic tensile deformation, thicker films show better stability than thinner films due to their higher ductility and the larger capability of strain accommodation. For the fatigue resistance, however, a more complex behavior was observed depending on the amount of the applied strain. For low strain amplitude in the high cycle fatigue (HCF) regime, thinner films exhibit longer fatigue life because the larger strength of thinner films suppresses dislocation movement and damage nucleation. However, for high strain amplitudes in the low cycle fatigue (LCF) regime, the fatigue life for thinner films is drastically reduced compared to thicker films. It is shown that fatigue coefficients in the LCF regime can be obtained when applying the Coffin-Manson relationship.</P></▼2>
Atomic Layer Deposition for Surface Engineering of Solid Oxide Fuel Cell Electrodes
Joon Hyung Shim,한권덕,Hyung Jong Choi,Yongmin Kim,Shicheng Xu,Jihwan An,Young Beom Kim,Tanja Graf,Thomas D. Schladt,Turgut M. Gür,Fritz B. Prinz 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
Atomic layer deposition (ALD) has recently attracted attention as a technique to synthesize and engineer high-performance catalysts and electrodes for fuel cells. Unique advantages of the ALD process include surface conformality and film uniformity along nano-scale features and the ability to deposit one atom layer or less per deposition cycle, enabling atomic-scale modification of the composition and morphology of the material surface. Many recent reports have demonstrated the effectiveness of the ALD surface modification strategy for the development of novel fuel cell materials. For enhancement of fuel cell performance, development of superior electrocatalytic electrodes is essential as a significant portion of energy loss occurs due to the charge transfer reaction either on the surface of electrodes or at the interfaces between electrodes and electrolytes. Therefore, ALD is considered a key fabrication process to design and engineer high-performance fuel cell systems. This review covers the important recent developments advanced electrode materials for solid oxide fuel cells (SOFCs) provided by the unique abilities of ALD for surface engineering and interface modification. Performance enhancement and related mechanisms are also discussed in depth.
Palanikumar, L.,Kim, Ho Young,Oh, Joon Yong,Thomas, Ajesh P.,Choi, Eun Seong,Jeena, M. T.,Joo, Sang Hoon,Ryu, Ja-Hyoung American Chemical Society 2015 Biomacromolecules Vol.16 No.9
<P>Advances in water-insoluble drug delivery systems are limited by selective delivery, loading capacity, and colloidal and encapsulation stability. We have developed a simple and robust hydrophobic-drug delivery platform with different types of hydrophobic chemotherapeutic agents using a noncovalent gatekeeper’s technique with mesoporous silica nanoparticles (MSNs). The unmodified pores offer a large volume of drug loading capacity, and the loaded drug is stably encapsulated until it enters the cancer cells owing to the noncovalently bound polymer gatekeeper. In the presence of polymer gatekeepers, the drug-loaded mesoporous silica nanoparticles showed enhanced colloidal stability. The simplicity of drug encapsulation allows any combination of small chemotherapeutics to be coencapsulated and thus produce synergetic therapeutic effects. The disulfide moiety facilitates decoration of the nanoparticles with cysteine containing ligands through thiol–disulfide chemistry under mild conditions. To show the versatility of drug targeting to cancer cells, we decorated the surface of the shell-cross-linked nanoparticles with two types of peptide ligands, SP94 and RGD. The nanocarriers reported here can release encapsulated drugs inside the reducing microenvironment of cancer cells via degradation of the polymer shell, leading to cell death.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bomaf6/2015/bomaf6.2015.16.issue-9/acs.biomac.5b00589/production/images/medium/bm-2015-00589d_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bm5b00589'>ACS Electronic Supporting Info</A></P>
Park, Min Hyuk,Lee, Young Hwan,Kim, Han Joon,Kim, Yu Jin,Moon, Taehwan,Kim, Keum Do,Hyun, Seung Dam,Mikolajick, Thomas,Schroeder, Uwe,Hwang, Cheol Seong Royal Society of Chemistry 2018 Nanoscale Vol.10 No.2
<P>Hf1−xZrxO2 (<I>x</I> ∼ 0.5-0.7) has been the leading candidate of ferroelectric materials with a fluorite crystal structure showing highly promising compatibility with complementary metal oxide semiconductor devices. Despite the notable improvement in device performance and processing techniques, the origin of its ferroelectric crystalline phase (space group: <I>Pca</I>21) formation has not been clearly elucidated. Several recent experimental and theoretical studies evidently showed that the interface and grain boundary energies of the higher symmetry phases (orthorhombic and tetragonal) contribute to the stabilization of the metastable non-centrosymmetric orthorhombic phase or tetragonal phase. However, there was a clear quantitative discrepancy between the theoretical expectation and experiment results, suggesting that the thermodynamic model may not provide the full explanation. This work, therefore, focuses on the phase transition kinetics during the cooling step after the crystallization annealing. It was found that the large activation barrier for the transition from the tetragonal/orthorhombic to the monoclinic phase, which is the stable phase at room temperature, suppresses the phase transition, and thus, plays a critical role in the emergence of ferroelectricity.</P>
Machine health management in smart factory: A review
이길용,김민철,전영준,김민식,Thomas Joon Young Kim,윤해성,민상기,김동현,문정욱,오진우,최인규,김창수,추원식,양진규,Binayak Bhandari,이춘만,인정범,안성훈 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.3
In this paper, we present a review of machine health managements for the smart factory. As the Industry 4.0 leads current factory automation and intelligent machines, the machine health management for diagnostic and prognostic purposes are essential, and their importance is getting more significant for the realization of the smart factory in the Industry 4.0. After brief introductions to important concepts and definitions composing smart factory and Industry 4.0, the developments in maintenance strategies towards Prognostics and health management (PHM) of machines are summarized. The review of machine health managements is followed, classifying the references by the monitoring components, types of measurements, as well as PHM tools and algorithms. 94 existing articles are reviewed and summarized in this regard. The implementation of machine health management within the smart factory are discussed in terms of data connectivity, communications, Cyber-physical system (CPS) and virtual factory, addressing Internet of things (IoT), cloud computing, and big data management.
Characteristics of Classified Aerosol Types in South Korea during the MAPS-Seoul Campaign
Lee, Seoyoung,Hong, Jaemin,Cho, Yeseul,Choi, Myungje,Kim, Jhoon,Park, Sang Seo,Ahn, Joon-Young,Kim, Sang-Kyun,Moon, Kyung-Jung,Eck, Thomas F.,Holben, Brent N.,Koo, Ja-Ho Taiwan Association for Aerosol Research 2018 Aerosol and air quality research Vol.18 No.9
Biomineralized N-Doped CNT/TiO<sub>2</sub> Core/Shell Nanowires for Visible Light Photocatalysis
Lee, Won Jun,Lee, Ju Min,Kochuveedu, Saji Thomas,Han, Tae Hee,Jeong, Hu Young,Park, Moonkyu,Yun, Je Moon,Kwon, Joon,No, Kwangsoo,Kim, Dong Ha,Kim, Sang Ouk American Chemical Society 2012 ACS NANO Vol.6 No.1
<P>We report an efficient and environmentally benign biomimetic mineralization of TiO<SUB>2</SUB> at the graphitic carbon surface, which successfully created an ideal TiO<SUB>2</SUB>/carbon hybrid structure without any harsh surface treatment or interfacial adhesive layer. The N-doped sites at carbon nanotubes (CNTs) successfully nucleated the high-yield biomimetic deposition of a uniformly thick TiO<SUB>2</SUB> nanoshell in neutral pH aqueous media at ambient pressure and temperature and generated N-doped CNT (NCNT)/TiO<SUB>2</SUB> core/shell nanowires. Unlike previously known organic biomineralization templates, such as proteins or peptides, the electroconductive and high-temperature-stable NCNT backbone enabled high-temperature thermal treatment and corresponding crystal structure transformation of TiO<SUB>2</SUB> nanoshells into the anatase or rutile phase for optimized material properties. The direct contact of the NCNT surface and TiO<SUB>2</SUB> nanoshell without any adhesive interlayer introduced a new carbon energy level in the TiO<SUB>2</SUB> band gap and thereby effectively lowered the band gap energy. Consequently, the created core/shell nanowires showed a greatly enhanced visible light photocatalysis. Other interesting synergistic properties such as stimuli-responsive wettabilites were also demonstrated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-1/nn204504h/production/images/medium/nn-2011-04504h_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn204504h'>ACS Electronic Supporting Info</A></P>