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Surface energy and wettability of van der Waals structures
Annamalai, M.,Gopinadhan, K.,Han, S.,Saha, S.,Park, H.,Cho, E.,Kumar, B.,Patra, A.,Kim, S. W.,Venkatesan, T. Royal Society of Chemistry 2016 Nanoscale Vol.8 No.10
<P>The wetting behaviour of surfaces is believed to be affected by van der Waals (vdW) forces; however, there is no clear demonstration of this. With the isolation of two-dimensional vdW layered materials it is possible to test this hypothesis. In this paper, we report the wetting behaviour of vdW heterostructures which include chemical vapor deposition (CVD) grown graphene, molybdenum disulfide (MoS2) and tungsten disulfide (WS2) on few layers of hexagon boron nitride (h-BN) and SiO2/Si. Our study clearly shows that while this class of two-dimensional materials are not completely wetting transparent, there seems to be a significant amount of influence on their wetting properties by the underlying substrate due to dominant vdW forces. Contact angle measurements indicate that graphene and graphene-like layered transitional metal dichalcogenides invariably have intrinsically dispersive surfaces with a dominating London-vdW force-mediated wettability.</P>
Jayakumar T.,Annamalai K. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
The main aim of this research was to investigate the mechanical behavior of aluminum (LM25) alloy hybrid metal matrix composites for high-temperature applications. The L25 alloy is hybrid reinforced with varying silicon carbide (SiC), niobium carbide (NbC), and magnesium oxide (MgO) nanoparticle compositions. Hybrid particle-reinforced composites are manufactured by means of a liquid manufacturing technique. The hot tensile behavior of the LM25 matrix and hybrid composites was examined under the temperature condition 30 °C–400 °C as per ASTM B557 and ASTM E8M standards using a hot tensile test rig. In addition, the surface morphology of the LM25 alloy and SiC-, NbC-, and MgO-reinforced composites was investigated using scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX). The results of the surface morphology investigation of the composites revealed that the SiC, NbC, and MgO particles were homogenously scattered within the matrix and revealed clearer interface bonding. In tensile test, the LM25 alloy/ 3wt% SiC, NbC, and MgO (LMSMN-3) composite showed a yield and tensile strength around 230.82 MPa and 251.71 MPa, which was 25% larger than the LM25 alloy materials, whereas LM25 alloy/1wt% SiC, NbC, and MgO (LMSMN-1) and LM25 alloy/2wt% SiC, NbC, and MgO (LMSMN-2) composites showed a yield and tensile strength of 176.45 MPa, 203.71 MPa,192 MPa, and 211.32 MPa, respectively, which was 23% and 16.75% higher than the LM25 alloy under room temperature condition. Also, at elevated temperatures such as 200℃ and 400℃, the LMSMN-3 composite exhibited a maximum increase in the tensile properties, i.e., 48.28% at 200℃ and of 61.12% at 400℃.
I. T. Kadim,O. Mahgoub,W. Al-Marzooqi,K. Annamalai 아세아·태평양축산학회 2005 Animal Bioscience Vol.18 No.7
Near-infrared reflectance spectroscopic (NIRS) calibrations were developed for accurate and fast prediction of whole broiler chicken carcass composition. The Feed and Forage Foss systems Model 5000 Reflectance Transport Model 5000 with nearinfrared reflectance spectroscopy (NIRS)-WinISI II windows software was used for this purpose. One equation was developed for the prediction of each carcass component. One hundred and fifty freeze dried broiler whole carcass samples were ground in a Cyclotech 1,093 sample mill and analyzed for dry matter, protein, fat, calcium and phosphate. Samples were divided into two sets: a calibration set from which equations were derived and a prediction set used to validate these equations. The chemical analysis values (mean짹SD) were calculated based on dry matter basis as follows: dry matter: 33.41짹2.78 (range: 26.41-43.47), protein: 54.04짹6.63 (range: 36.20-76.09), fat 35.44짹8.34 (range: 7.50-55.03), calcium 2.55짹0.65 (range: 0.99-4.41), phosphorus 1.38짹0.26 (range: 0.60-2.28). One hundred and three samples were used to calibrate the equations and prediction values. The software used was modified to obtain partial least square regression statistics, as it is the most suitable for natural products analysis. The coefficients of determination (R2) and the standard errors of prediction were 0.82 and 1.83 for the dry matter, 0.96 and 1.98 for protein, 0.99 and 1.07 for fat, 0.90 and 0.30 for calcium and 0.91 and 0.11 for phosphorus, respectively. The present study indicated that NIRS can be calibrated to predict the whole broiler carcass chemical composition, including minerals in a rapid, accurate, and cost effective manner. It neither requires skilled operators nor generates hazardous waste. These findings may have practical importance to improve instrumental procedures for quick evaluation of broiler carcass composition.
Isaac JoshuaRamesh Lalvani J.,Parthasarathy M.,Dhinesh B.,Annamalai K. 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
In this investigation, the combustion, performance and emission characteristics of a diesel engine powered with Modified piston (MP)are studied. Engine tests have been carried out using conventional diesel and 20% blend of adelfa biodiesel [A20]. Results obtained fromrenewable fuel A20 in conventional engine have shown reduction in brake thermal efficiency that may be ascribed to poor air fuel mixingcharacteristics and higher viscosity of the fuel. This prompted the research towards improvement of turbulence for better air fuel mixingthrough a novel modification of the piston. The engine with modified piston has shown improved Brake thermal efficiency (BTE), Combustioncharacteristics and reduced hydrocarbon (HC), carbon mono oxide (CO), and smoke emissions. Nevertheless, the nitrogen oxideemissions have been found to be slightly higher than the conventional unmodified engine.