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Duplex and Composite Coatings: A Thematic Review on Thermal Spray Techniques and Applications
M. Sathish,N. Radhika,Bassiouny Saleh 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
Thermal spraying is a broad terminology for a coating process in which materials are deposited in a spray of finely distributedliquefied or semi-liquefied particulates to build layered deposition coatings. Duplex and composite coatings can be utilizedin the thermal spray technique to enhance the tribological properties of a broad range of engineering materials while savingmoney; service life extension, maintenance expenses, and replacement costs are lower than for single-layered coatings. As aresult, this paper critically analyses various pre-processing surface treatments for substrates, commonly used thermal sprayprocessing methods, and various post-processing surface treatments for thermally sprayed substrate materials. This paperalso includes a description of several characterization methodologies as well as some comprehensive prospective applicationsfor engineering components with challenges and scopes. Thus, this paper provides a fundamental understanding of surfacetreatments to researchers who use thermal spray coating techniques.
Fe-DECORATED FULLERENE (C60) NANOWHISKERS FOR ENVIRONMENTAL APPLICATION
M. SATHISH,K. MIYAZAWA 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2008 NANO Vol.3 No.5
Fe-decorated fullerene nanowhiskers were prepared by using the liquid–liquid interfacial precipitation method. The prepared nanowhiskers were characterized using scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), X-ray diffraction (XRD) and Raman spectroscopy. Formation of both tubular and nontubular nanowhiskers was observed with fine dispersion of Fe ions. The XRD and Raman-spectroscopic studies showed the fcc crystalline nature and polymerization of the nanowhiskers, respectively. The results were compared with Ce- and Ni-incorporated fullerene nanowhiskers.
Out of plane mode conversion and manipulation of Surface Plasmon Polariton Waves
Kumar, M. Sathish,Piao, Xianji,Koo, Sukmo,Yu, Sunkyu,Park, Namkyoo The Optical Society 2010 Optics express Vol.18 No.9
<P>We propose a rigorous design method of structured gratings for out of plane mode conversion, line focusing and manipulation of Surface Plasmon Polariton (SPP) waves. Employing a blazed grating to incorporate the directionality of SPP launch, and at the same time controlling grating depth and chirp to account for the radiation loss and diffraction angle, it was possible to achieve high efficiency and flexible SPP to freespace mode conversion. Devices with advanced functionalities, such as balanced SPP power splitter, and SPP wavelength demultiplexer are demonstrated with over 75% of power efficiencies at reasonable working distances of less than several wavelengths.</P>
B. Vikram Babu,M. Sushma Reddi,A. Rama Krishna,B. Sathish Mohan,G. Chandana,K. Anjani Devi,B. Sridhar,K. Samatha 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.5
This research article aims at reporting the influence of magnesium by studying the structural, electrical impedance and modulus properties of the Mg substituted Li 4 Ti 5 O 12 . These studies are useful for the electrochemical properties. The XRD reveals that the structure of all the Mg substituted materials belongs to the cubic spinel group having Fd-3m space symmetry. SEM images display the structural, morphological properties with the average size of grains falling in the vicinity of 1 μm. The electrical impedance of Li 4− x Mg x Ti 5 O 12 materials was analyzed at frequencies between 20 Hz and 1 MHz and in the 30–120 °C range of temperature by employing the complex impedance spectroscopy (CIS) method. The modulus formalism is also a suitable tool to understand the dynamical characteristics of electrical transport phenomena. The complex electric modulus spectrum signifi es quantifying the allocation of ion energies or confi gurations in the lattice. Also, it portrays the electrical relaxation of ion-conducting lattices as a feature of materials at a minuscule level. The obtained results of substitution of Mg in Li 4 Ti 5 O 12 anode materials improve the potential applications of conductivity and charge/discharge performance.
Sathish K.V.,Sridhar K.N.,Seenappa L.,Manjunatha H.C.,Vidya Y.S.,Chinnappa Reddy B.,Manjunatha S.,Santhosh A.N.,Munirathnam R.,Raj Alfred Cecil,Damodara Gupta P.S.,Sankarshan B.M. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
For the first time Aluminium-BariumeZinc oxide nanocomposite (ZABONC) was synthesized by solution combustion method where calcination was carried out at low temperatures (6000 C) to study the electromagnetic (EM) (X/g) radiation shielding properties. Further for characterization purpose standard techniques like PXRD, SEM, UV-VISIBLE, FTIR were used to find phase purity, functional groups, surface morphology, and to do structural analysis and energy band gap determination. The PXRD pattern shows (hkl) planes corresponding to spinel cubic phase of ZnAl2O4, cubic BaðNO3Þ2, a and g phase of Al2O3 which clearly confirms the formation of complex nano composite. From SEM histogram mean size of nano particles was calculated and is in the order of 17 nm. Wood and Tauc’s relation direct energy band gap calculation gives energy gap of 2.9 eV. In addition, EM (X/g) shielding properties were measured and compared with the theoretical ones using standard procedures (NaI (Tl) detector and multi channel analyzer MCA). For energy above 356 keV the measured shielding parameters agree well with the theory, while below this value slight deviation is observed, due to the influence of atomic/crystallite size of the ZABONC. Hence synthesized ZABONC can be used as a shielding material in EM (X/g) radiation shielding
Sathish K. Ponniah,Zhenhua Shang,M. Aydın Akbudak,Vibha Srivastava,Muthusamy Manoharan 한국식물생명공학회 2017 Plant biotechnology reports Vol.11 No.1
Rice straw is one of the largest biomasses in the world that can potentially be exploited for biofuel. Nevertheless, the association of lignin with cellulose and hemicellulose has hindered the efficient utilization of rice straw for cellulosic biofuel. The objective of this study was to down-regulate key genes involved in lignin biosynthesis pathway, such as hydroxycinnamoyl CoA: shikimate hydroxycinnamoyl transferase (HCT), cinnamoyl CoA reductase (CCR), and cinnamyl alcohol dehydrogenase (CAD), through “terminator-less” constructs to reduce lignin in transgenic rice. Real-time qPCR analyses of the selected T1 transgenic rice plants indicated 36–86% transcript reduction in HCT lines, 75–94% in CCR lines, and 10–85% in CAD lines. Of the nine down-regulated lines (three lines from each genes) subjected to lignin analysis, seven showed significant reduction in total lignin content (HCT-4, HCT-7, CAD-1, CAD-7, CCR-3, CCR-7, and CCR-12) with lignin reduction ranging from 4.6 to 10.8%. The results from this study indicated that truncated gene fragments lacking transcription termination sequence can be used for down-regulation of lignin genes in rice, and the rice straw from these transgenic lines could be useful as feedstock for cellulosic biofuel.
Contact analysis of spherical ball and a deformable flat model with the effect of tangent modulus
Sathish Gandhi, V.C.,Ramesh, S.,Kumaravelan, R.,Thanmanaselvi, M. Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
The paper is on contact analysis of a spherical ball with a deformable flat, considering the effect of tangent modulus on the contact parameters of a non-adhesive frictionless elastic-plastic contact. The contact analysis of this model has been carried out using analysis software Ansys and Abaqus. The contact parameters such as area of contact between two consecutive steps, volume of bulged material are evaluated from the formulated equations. The effect of the tangent modulus is considered for determining these parameters. The tangent modulus are accounted between 0.1E and 0.5E of materials E/Y value greater than 500 and less than 1750. Result shows that upto an optimal tangent modulus values the elastic core push up to the free surface in the flat. The simulation is also carried out in Abaqus and result provide evidence for the volume of bulged material in the contact region move up and flow into the free surface of the flat from the contact edge between the ball and flat. The strain energy of the whole model is varied between 20 to 40 percentage of the stipulated time for analysis.
금속 나노갭과 나노선에서의 특이 장 집속도 향상에 대한 유전체 기판의 영향
구석모,M. Sathish Kumar,박남규 한국물리학회 2010 새물리 Vol.60 No.1
Recently, researching extraordinary optical transmission phenomena based on the metallic structure has become popular because of its ability to break the diffraction limit. Most of the metamaterial structures in these experiments were on dielectric substrates because the difficulty in making free-standing metallic nanostructures. In this research, a finite-difference time-domain (FDTD) analysis was performed on the effect of the substrate on extraordinary field enhancement in metallic nanogap and nanowire structures and confirmed that, in contrast to the reduced electric field enhancement in nanogaps caused by the dielectric substrate, the effect of the dielectric substrate on the magnetic field enhancement was negligible. 최근 금속으로 이루어진 구조에서의 특이 광 투과현상에 대한 연구가 활발한데, 이는 이 구조가 회절 한계를 극복할 수 있기 때문이다. 이에 대한 실험 연구를 위한 메타 물질은 대부분 유전체 기판 위에 올려져 있는데, 이는 금속을 프리 스탠딩 (free standing) 상태로 만들기가 매우 어렵기 때문이다. 본 논문에서는 유전체 물질이 나노갭 (Nanogap)과 나노선 (Nanowire) 구조에서 특이 광 집속도 향상에 어떠한 영향을 주는지 분석하였다. 나노갭에서의 전기장 향상은 유전체 기판에 의해서 줄어드는 반면에 나노선에서의 자기장 향상은 영향이 없음을 분석하고 FDTD 전산모사로 이를 확인하였다.
Contact analysis of spherical ball and a deformable flat model with the effect of tangent modulus
V.C. Sathish Gandhi,S. Ramesh,R. Kumaravelan,M. Thanmanaselvi 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.1
The paper is on contact analysis of a spherical ball with a deformable flat, considering the effect of tangent modulus on the contact parameters of a non-adhesive frictionless elastic-plastic contact. The contact analysis of this model has been carried out using analysis software Ansys and Abaqus. The contact parameters such as area of contact between two consecutive steps, volume of bulged material are evaluated from the formulated equations. The effect of the tangent modulus is considered for determining these parameters. The tangent modulus are accounted between 0.1E and 0.5E of materials E/Y value greater than 500 and less than 1750. Result shows that upto an optimal tangent modulus values the elastic core push up to the free surface in the flat. The simulation is also carried out in Abaqus and result provide evidence for the volume of bulged material in the contact region move up and flow into the free surface of the flat from the contact edge between the ball and flat. The strain energy of the whole model is varied between 20 to 40 percentage of the stipulated time for analysis.