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Krishnamoorthy, K.,Jeyasubramanian, K.,Premanathan, M.,Subbiah, G.,Shin, H.S.,Kim, S.J. Pergamon Press ; Elsevier Science Ltd 2014 Carbon Vol.72 No.-
Nanostructured materials are receiving growing interest in the development of a number of commercial products. In this study, we have developed a multifunctional graphene oxide (GO) nanopaint by incorporating GO sheets in an alkyd resin with suitable non-toxic additives using ball milling. The drying mechanism of the GO nanopaint has been discussed. Intermolecular cross-linking between GO and the lipid chains in the alkyd resin was studied by Fourier transform infra red spectra, Raman spectra, and X-ray photoelectron spectra, respectively. The prepared GO nanopaint exhibited good corrosion-resistant behavior in both acidic and high-salt-content solutions as examined by the immersion and electrochemical corrosion tests. The GO nanopaint coating possesses a corrosion protection efficiency of about 76% in salt water as estimated from the linear polarization studies. The antibacterial property of the GO nanopaint coated surface was studied against three bacterial strains (Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa) and the results showed that GO nanopaint inhibited the bacterial growth on its surface. The in situ biofouling tests demonstrated the inhibition of fouling on the GO nanopaint surface.
Poling Quality Evaluation of Periodically Poled Lithium Niobate Using Diffraction Method
Krishnamoorthy Pandiyan,Yeon-Suk Kang,,Om Prakash,차명식 한국광학회 2008 Current Optics and Photonics Vol.12 No.3
We demonstrated a simple way of evaluating the duty cycle error in periodically polled lithium niobate (PPLN) based on the method of binary phase diffraction grating. To demonstrate this method, –Z face etched PPLN of desired periods were fabricated by the standard electric field poling technique. The etched PPLN was considered as a surface–relief binary phase grating. The diffraction patterns were recorded for different spatial locations along the length of the sample. The experimentally observed efficiencies of the diffracted orders were compared with the theoretically calculated values to estimate the duty cycle error.
Krishnamoorthy Ramasamy,Manoharan Melvin Joe,김기윤,이선미,Charlotte Shagol,Anandham Rangasamy1,정종배,Md. Rashedul Islam,사동민 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.4
Soil microorganisms play a major role in improving soil fertility and plant health. Symbiotic arbuscular mycorrhizal fungi (AMF) form a key component of the soil microbial populations. AMF form a mutualistic association with the host plant and exert a positive influence on its growth and nutrient uptake. The establishment of mycorrhizal symbioses with the host plant can positively be influenced by plant growth promoting rhizobacteria through various mechanisms such as increased spore germination and hyphal permeability in plant roots. Though there are evidences that combined interactions between AMF and PGPR can promote the plant growth however mechanisms of these interactions are poorly understood. Better understanding of the interactions between AMF and other microorganisms is necessary for maintaining soil fertility and enhancing crop production. This paper reviews current knowledge concerning the interactions between AMF and PGPR with plants and discusses on enhanced nutrient availability, biocontrol, abiotic stress tolerance and phytoremediation in sustainable agriculture.
Graphdiyne nanostructures as a new electrode material for electrochemical supercapacitors
Krishnamoorthy, K.,Thangavel, S.,Chelora Veetil, J.,Raju, N.,Venugopal, G.,Kim, S.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.3
<P>The utility of carbon materials for electrochemical energy storage devices has been rapidly increasing in the recent years. In this study, graphdiyne nanostructures have been prepared via a cross-coupling reaction and their electrochemical properties were investigated for supercapacitor applications. Spectroscopic studies such as X-ray photoelectron spectroscopy and Raman analysis confirmed the formation of graphdiyne with high order and low defects. Cyclic voltammetric studies revealed the quasi-rectangular profiles suggesting the presence of electrochemical double layer and Faradaic capacitance in graphdiyne. The graphdiyne electrode delivered a specific capacitance of about 71.4 F/g from the galvanostatic charge discharge analysis measured at a constant discharge current density of 3.5 A/g. Moreover, the cyclic stability tests demonstrated excellent capacitance retention of about 97% for the graphdiyne electrode. These studies suggested the potential applications of graphdiyne as an electrode material for supercapacitor devices. Copyright (c) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
Cadmium Sulphide Nanorods: Synthesis, Characterization and their Photocatalytic Activity
Krishnamoorthy Giribabu,Ranganathan Suresh,Ramadoss Manigandan,Arunachalam Vijayaraj,Raju Prabu,Vengidusamy Narayanan 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.9
Cadmium sulphide (CdS) nanorods were prepared by a single precursor thermal decomposition (SPTD) method. The formation of CdS nanorods and their structure, morphology and elemental composition were studied by means of FT-IR, XRD, FE-SEM, HR-TEM and EDAX analysis. Photoluminescence (PL) and lifetime measurements were recorded to study the luminescence properties of the material. The PL spectrum of the CdS nanorods showed one broad peak and four shoulders and the cause for this emission was discussed. The PL emissions from the band edge and deep trap state of the CdS nanorods were studied by lifetime measurements. Further, the synthesized CdS nanorods showed an increase in efficiency of photocatalytic degradation of methylene blue (MB) and rhodamine B (RhB). The increase in the photocatalytic activity was attributed to the mixed phase of the CdS nanorods.
Ruthenium sulfide nanoparticles as a new pseudocapacitive material for supercapacitor
Krishnamoorthy, Karthikeyan,Pazhamalai, Parthiban,Kim, Sang Jae Pergamon Press 2017 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>Transition metal chalcogenides received much attention as high performance electrode materials for energy storage devices during this decade. In this article, we demonstrated the sonochemical preparation of cubic RuS<SUB>2</SUB> nanoparticles with average size in the range of 20nm and investigated their supercapacitive properties in detail using cyclic voltammetry, charge-discharge analysis and electrochemical impedance spectroscopy, respectively. The RuS<SUB>2</SUB> electrode delivered a specific capacitance of 85Fg<SUP>−1</SUP> at a constant discharge current density of 0.5mAcm<SUP>−1</SUP> using a three electrode configuration. The RuS<SUB>2</SUB> symmetric supercapacitor device delivered a specific capacitance of 17Fg<SUP>−1</SUP> and excellent cyclic stability of about 96.15% capacitance retention over 5000 cycles. The electrochemical impedance spectroscopy (Nyquist and Bode) analysis together with the frequency dependent capacitance (real and imaginary) studies confirmed the ideal capacitive nature of the RuS<SUB>2</SUB> supercapacitor. The experimental findings ensure the potential application of RuS<SUB>2</SUB> nanoparticles as a novel electrode material for electrochemical energy storage devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> RuS<SUB>2</SUB> nanoparticles were prepared via sonochemical approach. </LI> <LI> RuS<SUB>2</SUB> based symmetric supercapacitor (SC) device was fabricated. </LI> <LI> Symmetric RuS<SUB>2</SUB> SC device delivered a specific capacitance of 17Fg<SUP>−1</SUP>. </LI> <LI> The RuS<SUB>2</SUB> SC device possesses capacitance retention of about 96.15% over 5000 cycles. </LI> </UL> </P>
An absolute displacement approach for modeling of sliding structures
Krishnamoorthy, A. Techno-Press 2008 Structural Engineering and Mechanics, An Int'l Jou Vol.29 No.6
A procedure to analyse the space frame structure fixed at base as well as resting on sliding bearing using total or absolute displacement in dynamic equation is developed. In the present method, the effect of ground acceleration is not considered as equivalent force. Instead, the ground acceleration is considered as a known value in the acceleration vector at degree of freedom corresponding to base of the structure when the structure is in non-sliding phase. When the structure is in sliding phase, only a force equal to the maximum frictional resistance is applied at base. Also, in this method, the stiffness matrix, mass matrix and the damping matrix will not change when the structure enters from one phase to another. The results obtained from the present method using absolute displacement approach are compared with the results obtained from the analysis of structure using relative displacement approach. The applicability of the analysis is also demonstrated to obtain the response of the structure resting on sliding bearing with restoring force device.