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S. V. Sujith,Hansoo Kim,Rahul S. Mulik,Hyeonwoo Park,Joonho Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Owing to the high propensity for particle agglomeration, the fabrication of aluminum matrix composites with uniformdistribution using casting routes is extremely difficult. In this study, the in-situ development of the Al3Tireinforcing phaseby employing stir-assisted ultrasonic treatment was utilized to improve the homogeneity, wettability, and thermodynamicstability of the reinforcing particles in an Al-7075 alloy matrix. The in-situ Al3Tiparticles acted as heterogeneous nucleationsites and facilitated grain refinement to form a non-dendritic globular structure compared with the dendritic cells of the basealloy. The grain size of the α-Al dendrites reduced from 160 μm to 65, 50, and 40 μm with the addition of 2, 5, and 7 wt%Al3Ti,respectively. The reduction in the porosity of the composites and the improvement of the particle homogenizationwere due to cavitation-induced de-agglomeration and the degassing effect. The formation of a robust and clean interfacebetween the Al3Tiparticles and Al alloy via ultrasonic vibration improved the integrity of the composites compared withthat of the base alloy. The thermal expansion mismatch between the Al3Tiparticles and Al alloy contributed significantly tothe improved mechanical properties of the composites.
Sujith, S.,Noh, E.K.,Lee, B.Y.,Han, J.W. Elsevier Sequoia 2008 Journal of organometallic chemistry Vol.693 No.12
η<SUP>3</SUP>-benzylnickel complexes of N-heterocyclic carbenes are prepared and characterized in this study. While the imidazolinylidene complexes are inactive, the imidazolylidene-based η<SUP>3</SUP>-benzyl complexes exhibit good activity for norbornene homopolymerization without the requirement of any activator.
Sujith Vijayan 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.6
Freeze gelcasting of naphthalene-in-aqueous alumina slurry emulsions prepared from slurries of various alumina concentrations were studied to prepare macroporous alumina ceramics of high porosity. The compressive strength and Young’s modulus of the gelled emulsion bodies increased with an increase in naphthalene to alumina slurry volume ratio and a decrease in the alumina slurry concentration. Macroporous alumina ceramics obtained were characterized for their microstructure, porosity, pore size and compressive strength as a function of naphthalene to alumina slurry volume ratio and alumina concentration in the aqueous slurry. Porosity (65 to 90 vol.%) increased with an increase in naphthalene to alumina slurry volume ratio and a decrease in alumina slurry concentration. The compressive strength and Young’s modulus of the macroporous alumina ceramics were fitted with the model equations proposed by Gibson and Ashby. The gelled emulsionsshowed paste-like consistency which enabled easy fabrication of macroporous alumina tiles by compression moulding.
Sujith S,Bun Yeoul Lee*,한진욱 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.8
New sulfur functionalized cyclopentadiene ligands, 1-[2-(thioanisole)]-2,5-dimethylcyclopentadiene (3), 1-[2-(thioanisole)]-2,3,5-trimethylcyclopentadiene (4), and 1-[2-(thioanisole)]-2,3,4,5-tetramethylcyclopentadiene (5), were prepared. In these ligands, the S-donor atom is connected to a cyclopentadiene ring by a rigid phenylene spacer. CpCo(III)-diiodo half-sandwich complexes (6-8) were obtained from reaction the ligands (3-5) with Co2(CO)8, followed by treatment of I2. Substitution reaction of CpCo(III)-diiodo complexes with MeLi yielded the corresponding CpCo(III)-dimethyl complexes (9-11). Further transformation to the corresponding cationic cobalt complexes (12-14) were achieved by reaction of the CpCo(III)-dimethyl complexes with HB(ArF)42Et2O and trapping with CD3CN. The new sulfur functionalized cyclopentadiene ligands having a rigid phenylene spacer and the corresponding cobalt complexes were characterized by 1H, 13C and 19F NMR spectroscopy. The diiodo Complex 6 was also characterized by a single crystal X-ray diffraction method.
Weerasinghe, Sujith V. W.,Ku, Nam-On,Altshuler, Peter J.,Kwan, Raymond,Omary, M. Bishr The Company of Biologists Ltd. 2014 Journal of cell science Vol.127 No.7
<P>Keratin 18 (K18 or KRT18) undergoes caspase-mediated cleavage during apoptosis, the significance of which is poorly understood. Here, we mutated the two caspase-cleavage sites (D238E and D397E) in K18 (K18-DE), followed by transgenic overexpression of the resulting mutant. We found that K18-DE mice develop extensive Fas-mediated liver damage compared to wild-type mice overexpressing K18 (K18-WT). Fas-stimulation of K18-WT mice or isolated hepatocytes caused K18 degradation. By contrast, K18-DE livers or hepatocytes maintained intact keratins following Fas-stimulation, but showed hypo-phosphorylation at a major stress-kinase-related keratin 8 (K8) phosphorylation site. Although K18-WT and K18-DE hepatocytes showed similar Fas-mediated caspase activation, K18-DE hepatocytes were more ‘leaky’ after a mild hypoosmotic challenge and were more susceptible to necrosis after Fas-stimulation or severe hypoosmotic stress. K8 hypophosphorylation was not due to the inhibition of kinase binding to the keratin but was due to mutation-induced inaccessibility to the kinase that phosphorylates K8. A stress-modulated keratin phospho-mutant expressed in hepatocytes phenocopied the hepatocyte susceptibility to necrosis but was found to undergo keratin filament reorganization during apoptosis. Therefore, the caspase cleavage of keratins might promote keratin filament reorganization during apoptosis. Interference with keratin caspase cleavage shunts hepatocytes towards necrosis and increases liver injury through the inhibition of keratin phosphorylation. These findings might extend to other intermediate filament proteins that undergo proteolysis during apoptosis.</P>
Mangalathu, Sujith,Jeon, Jong-Su Elsevier 2018 ENGINEERING STRUCTURES Vol.160 No.-
<P><B>Abstract</B></P> <P>Beam-column joints are one of critical components that control the oveerall performance of reinforced concrete building frames under seismic loadings. To identify the response mechanism, including the classification of failure mode and the prediction of associated shear strength, of beam-column joints, this paper introduces the application of machine learning techniques. The efficiency of various machine learning techniques is evaluated using extensive experimental data from 536 experimental tests, all of which exhibited either non-ductile joint shear failure prior to beam yielding or ductile joint shear failure after beam yielding. It has been seen from the comparison that lasso regression has a better efficiency and reasonable accuracy in the classification and prediction. The suggested formulations as a function of influential input variables can be easily used by structural engineers to provide an optimal rehabilitation strategy for existing buildings and to design new structures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Identification of mode of failure of beam-column joints through machine learning techniques. </LI> <LI> Probabilistic models to capture the type of failure and shear strength of beam-column joints. </LI> <LI> Sensitivity of input variables to joint shear strength. </LI> <LI> Comparison of various machine learning techniques to estimate the shear strength of beam-column joints. </LI> </UL> </P>
Kalluri, Sujith,Yoon, Moonsu,Jo, Minki,Park, Suhyeon,Myeong, Seungjun,Kim, Junhyeok,Dou, Shi Xue,Guo, Zaiping,Cho, Jaephil Wiley Blackwell (John Wiley Sons) 2017 Advanced energy materials Vol.7 No.1
<P>Battery industries and research groups are further investigating LiCoO2 to unravel the capacity at high-voltages (>4.3 vs Li). The research trends are towards the surface modification of the LiCoO2 and stabilize it structurally and chemically. In this report, the recent progress in the surface-coating materials i.e., single-element, binary, and ternary hybrid-materials etc. and their coating methods are illustrated. Further, the importance of evaluating the surface-coated LiCoO2 in the Li-ion full-cell is highlighted with our recent results. Mg, P-coated LiCoO2 full-cells exhibit excellent thermal stability, high-temperature cycle and room-temperature rate capabilities with high energydensity of approximate to 1.4 W h cc(-1) at 10 C and 4.35 V. Besides, pouch-type full-cells with high-loading (18 mg cm(-2)) electrodes of layered-Li(Ni,Mn)O-2 -coated LiCoO2 not only deliver prolonged cycle-life at room and elevated-temperatures but also high energy-density of approximate to 2 W h cc(-1) after 100 cycles at 25 degrees C and 4.47 V (vs natural graphite). The post-mortem analyses and experimental results suggest enhanced electrochemical performances are attributed to the mechanistic behaviour of hybrid surface-coating layers that can mitigate undesirable side reactions and micro-crack formations on the surface of LiCoO2 at the adverse conditions. Hence, the surface-engineering of electrode materials could be a viable path to achieve the high-energy Li-ion cells for future applications.</P>
Surendran Sujith,Min Hyung Lee 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.1
A series of p-nido-carborane-triarylborane conjugates (nido-1-3) in which a methyl group is introduced at the ortho-position to the carborane cage in the phenylene linker was prepared and characterized. All compounds exhibit broad low-energy absorptions (?abs = ca. 350?400?nm) attributable to the intramolecular charge transfer transition from the nido-carborane donor to the (MePh)BMes2 acceptor. Electrochemical studies confirm that oxidation occurs at the nido-carborane while the boryl moieties are responsible for the reduction. All nido-compounds show broad green emissions in tetrahydrofuran (THF) with good photoluminescence (PL) quantum yields (ΦPL = 24%?78%). In particular, different from the almost non-thermally activated delayed fluorescence (TADF) properties of unsubstituted para-conjugates, the transient PL decay curves of nido-1-3 show the existence of weak TADF (τd = 0.9?1.4 ?s in THF). The TADF properties are further supported by the very small singlet-triplet energy splitting below 0.15?eV and are also observed in poly(methyl methacrylate) (PMMA) films doped with nido-1-3.