Search results for: K. Ravichandran

Items from 1 to 20 out of 143 results

article

Left atrial hypertension and the risk of early incident heart failure after atrial fibrillation ablation

Jasen L. Gilge, Asim Ahmed, Brad A. Clark, Alexander Slaten, more

Journal of Cardiovascular Electrophysiology > 32 > 2 > 325 - 332

Introduction Elevated left atrial pressure (LAP) during catheter ablation of atrial fibrillation (AF) is associated with an increased risk of AF recurrence, but it is unknown if this correlates with heart failure (HF). The objective of the study was to determine if elevated LAP after AF ablation correlates with HF events. Methods Prospective, single‐center, cohort study measuring LAP and right...

article

Initial skin cancer screening for solid organ transplant recipients in the United States: Delphi method development of expert consensus guidelines

Lauren D. Crow, Anokhi Jambusaria‐Pahlajani, Christina L. Chung, David A. Baran, more

Transplant International > 32 > 12 > 1268 - 1276

Skin cancer is the most common malignancy affecting solid organ transplant recipients (SOTR), and SOTR experience increased skin cancer‐associated morbidity and mortality. There are no formal multidisciplinary guidelines for skin cancer screening after transplant, and current practices are widely variable. We conducted three rounds of Delphi method surveys with a panel of 84 U.S. dermatologists and...

article

Influence of Cu + g-C₃N₄ incorporation on the photocatalytic dye decomposition of ZnO film coated on stainless steel wire meshes

K. Ravichandran, K. Shantha Seelan, P. Kavitha, S. Sriram

Journal of Materials Science: Materials in Electronics > 2019 > 30 > 22 > 19703- 19717

The present study is aimed to enhance the photocatalytic dye degradation efficiency of ZnO thin film by suitably adding copper + graphitic carbon nitride (Cu + g-C₃N₄). The thin films were deposited on flexible stainless steel substrates using nebulizer spray method. The prepared samples were subjected to XRD, PL, FTIR, DRS, SEM, HRTEM, EDAX and XPS studies to analyze how the addition of Cu + g-C₃...

article

Critical notes on the identity and distribution of Sonneratia griffithii Kurz (Lythraceae) in India – a critically endangered mangrove species

P. Ragavan, Sourav Kumar Dubey, Muktipada Panda, Malancha Deyroy, more

Nordic Journal of Botany > 37 > 1 > n/a - n/a

The identity and distribution in India of Sonneratia griffithii Kurz, a critically endangered mangrove species, is validated and corrected. Field surveys showed that S. griffithii only occurs in the Andaman Islands and that specimens from the Indian Sundarbans and Odisha previously misidentified as S. griffithii instead belong to S. alba. An updated taxonomic description and illustration is provided,...

article

Effect of Substrate Temperature on Structural, Morphological, Magnetic, and Electrical Properties of Fe₂CoSi Heusler Alloy Thin Films for Spin-Based Device Applications

V. Asvini, G. Saravanan, R. K. Kalaiezhily, M. Manivel Raja, more

Journal of Superconductivity and Novel Magnetism > 2019 > 32 > 7 > 2247-2257

Fe₂CoSi based Heusler alloy thin films are deposited on single crystal Si (111) substrate at different substrate temperatures varying from room temperature to 600 °C using ultrahigh vacuum DC magnetron sputtering. Structural analysis of the prepared thin films is carried out using GI-XRD measurement and it conform ordered L2₁ crystal structure of the films deposited at 450 °C and above. The atomic...

article

Concomitant preparation of ZnS thin film and nanopowder forms from SILAR baths: An attempt to sort-out wastage problem

S. Porkodi, M. Baneto, K. Ravichandran, C. Dhanraj

Journal of Materials Science: Materials in Electronics > 2019 > 30 > 2 > 1383-1389

As wastage of a large percentage of source material used is the main disadvantage of successive ionic layer adsorption and reaction (SILAR) technique, in the present work, a new approach is adopted by simultaneously preparing thin films and powders from the SILAR bath solutions. The amount of source material used for thin film and powder form is estimated to find the resultant wastage. In this study,...

article

Investigations on structural and optical properties of chalcone dendrimer in Ag@TiO₂ core–shell nanoparticles

R. Vanathi Vijayalakshmi, S. Selvarani, P. Praveen Kumar, P. Rajakumar, more

Applied Physics A > 2018 > 124 > 11 > 1-11

The main focus of this research article is to observe the contributions of chalcone dendrimer in Ag@TiO₂ core shell nanoparticles. The samples were synthesized by Redox transmetalation method. The structure of the samples in three molar ratio viz.1:1, 1:2, 1:5 (noted as A,B,C) with Poly Vinyl Pyrrolidone (PVP) as stabilizing agent were compared with the sample Ag@TiO₂ of 1:2 molar ratio (noted as...

article

Effect of Fe doping on the photocatalytic activity of ZnO nanoparticles: experimental and theoretical investigations

B. Radha, R. Rathi, K. C. Lalithambika, A. Thayumanavan, more

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 16 > 13474- 13482

Pure and Fe doped ZnO nanoparticles were prepared by a facile and cost-effective co-precipitation method. The X-ray diffractograms (XRD) reveal that the grown nanoparticles are hexagonal in structure and the crystallite sizes are in the range of 27–28 nm. The transmission electron microscope (TEM) micrographs confirmed the spherical nature of the grown particles and the Fourier transform-infrared...

article

Luminescence from Zn interstitials due to combustion derived complex of Dy and Gd activated ZnO nanopowders

R. K. Kalaiezhily, V. Asvini, G. Saravanan, K. Ravichandran

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 14 > 12001- 12009

ZnO is an II–VI compound semiconductor possessing wide, direct bandgap (3.37 eV) and high excitonic binding energy (60 meV) even at room temperature. High crystalline ZnO nanostructures show distinctive characteristics in light emission, particularly in lasing applications. Here, in this work, rare earth doping in ZnO was carried out to enhance its photoluminescence property. Pure, 2 mol% Dy doped,...

article

Solvent volume-driven CuInAlS₂ nanoflake counter electrode for effective electrocatalytic tri-iodide reduction in dye-sensitized solar cells

C. Ravi Dhas, A. Jennifer Christy, R. Venkatesh, Subhendu K. Panda, more

Journal of Solid State Electrochemistry > 2018 > 22 > 8 > 2485-2497

The influence of solvent volume on the properties of CuInAlS₂ (CIAS) thin films deposited using simple and cost-effective nebulizer spray technique is studied. The polycrystalline CIAS thin films with tetragonal structure have been observed from the XRD results. SEM images show nanoflake-like structure on the film surface. The elemental presence and its chemical composition were examined by XPS and...

article

Enhancing the structural, optical and magnetic properties of Cu₂O films deposited using a SILAR technique through Fe-doping

S. Satheeskumar, S. Vadivel, K. Dhanabalan, A. Vasuhi, more

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 11 > 9354-9360

Undoped and Ferrous (Fe)-doped Cu₂O thin films were deposited onto glass substrates using successive ionic layer adsorption and reaction method. The variation in the concentration of Fe has significant impact on the final film properties, Fe doping with 5 wt% exhibited major property improvements compared with undoped and Fe doped films. The structural, optical, morphological, magnetic properties...

article

Troubleshooting electromagnetic interference in a patient with centrifugal flow left ventricular assist device and subcutaneous implantable cardioverter defibrillator

Asim S. Ahmed, Parin J. Patel, Shiv Bagga, Jasen L. Gilge, more

Journal of Cardiovascular Electrophysiology > 29 > 3 > 477 - 481

A 25‐year‐old man with severe nonischemic dilated cardiomyopathy underwent subcutaneous implantable cardioverter defibrillator (S‐ICD) implant and subsequently underwent HeartWare ventricular assist device (HVAD) placement. Postoperative interrogation revealed both primary and secondary S‐ICD vectors inappropriately regarded sinus rhythm as “noise,” and the alternate vector significantly undersensed...

article

Ag activated SnO₂ films for enhanced photocatalytic dye degradation against toxic organic dyes

A. S. Manikandan, K. B. Renukadevi, K. Ravichandran, E. Sindhuja

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 10 > 8547-8554

In the present work, tin oxide and Ag doped tin oxide thin films were fabricated using jet nebulizer spray pyrolysis technique and the photocatalytic properties of the prepared samples were analyzed by studying the photodegradation of methylene blue dye under visible light. The rate constant value is 0.0254 and 0.0193 min⁻¹ for SnO₂ and SnO₂:Ag films, respectively. The results confirm that SnO₂:Ag...

article

Fabrication of Co + F Doped ZnO Films for Improved Visible Light Responsive Photocatalysis

R. Uma, K. Ravichandran

Kinetics and Catalysis > 2017 > 58 > 6 > 701-709

The aim of this work is to investigate the efficacy of nebulizer sprayed ZnO–Co–F thin films for degrading the methylene blue (MB) aqueous solution under visible light irradiation. The physical properties of the prepared samples like structural, surface morphological and optical properties are studied using X-ray diffractometer (XRD), Scanning Electron Microscope (FESEM), UV-vis NIR spectrometer,...

article

Cost-effective fabrication of ZnO/g-C3N4 composite film coated stainless steel meshes for visible light responsive photocatalysis

K. Ravichandran, K. Kalpana, R. Uma, E. Sindhuja, more

Materials Research Bulletin > 2018 > 99 > C > 268-280

The ZnO and ZnO/g-C₃N₄ composite films were deposited on stainless steel meshes having different apertures (370, 500, 780 and 1000μm) using a simple cost-effective automated tubular nebulizer spray pyrolysis technique for photocatalytic degradation of organic pollutants. Photocatalytic studies were done for the degradation of methylene blue (MB) and malachite green (MG). The photocatalytic studies...

article

Nebulizer spray-deposited CuInGaS2 thin films, a viable candidate for counter electrode in dye-sensitized solar cells

C. Ravi Dhas, A. Jennifer Christy, R. Venkatesh, K.S. Anuratha, more

Solar Energy > 2017 > 157 > C > 58-70

Nebulizer spray pyrolysis technique has been employed to deposit the CuInGaS₂ (CIGS) counter electrode at different substrate temperatures. The XRD patterns revealed that the obtained films are in tetragonal structure with the preferential orientation of (112) plane and crystalline parameters were calculated. The A1 mode of CIGS film was observed at 296cm⁻¹ by Raman spectra, which is a combination...

article

Single step transformation of urea into metal-free g-C3N4 nanoflakes for visible light photocatalytic applications

N. Chidhambaram, K. Ravichandran

Materials Letters > 2017 > 207 > C > 44-48

g-C₃N₄ nanoflakes were prepared via a single step pyrolysis route from urea. X-ray diffraction analysis confirms the graphitic phase of the synthesized carbon nitride material. FT-IR analysis confirms the layered structure of sp² hybridized carbon and nitrogen bonding features. Photoluminescence spectrum of g-C₃N₄ sample demonstrates the existence of various emission centers located at 431, 452, 488...

article

Revealing the influence of the Bi dopant on the structural, photoluminescence and antibacterial properties of ZnO nanoparticles

A. T. Ravichandran, R. Karthick, K. Ravichandran, D. Ravinder, more

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 4 > 2784-2790

Undoped and Bi doped zinc oxide nanoparticles were synthesized by soft chemical method. The effects of doping on structural and optical properties of Bi doped nanoparticles were investigated. The product was subjected to powder X-ray diffraction, field emission scanning electron microscope, transmission electron microscope and photoluminescence techniques. The crystallite sizes of synthesized samples...

article

Cost-effective fabrication of ZnO/g-C3N4 composite thin films for enhanced photocatalytic activity against three different dyes (MB, MG and RhB)

R. Uma, K. Ravichandran, S. Sriram, B. Sakthivel

Materials Chemistry and Physics > 2017 > 201 > C > 147-155

The aim of this work is to deposit cost-effective ZnO/g-C₃N₄ composite thin film on glass substrates and to study its photocatalytic dye degradation efficiency against three toxic organic dyes MB, MG and RhB. A simple and inexpensive nebulizer spray technique was employed to deposit the composite thin film samples. The photocatalysis experiment carried out against these three dyes showed that the...

article

Fabrication of ZnO:Ag/GO composite thin films for enhanced photocatalytic activity

K. Ravichandran, R. Uma, S. Sriram, D. Balamurgan

Ceramics International > 2017 > 43 > 13 > 10041- 10051

Zinc Oxide (ZnO), ZnO/GO (Graphene Oxide) and ZnO:Ag/GO nanocomposite thin films were deposited on glass substrates using a simple cost-effective automated jet nebulizer spray pyrolysis technique for photocatalytic degradation of organic dyes. The ZnO:Ag/GO film exhibits superior photocatalytic activity when compared with ZnO and ZnO/GO films. The degradation rate constant values of pristine ZnO and...

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Search results for: K. Ravichandran

Left atrial hypertension and the risk of early incident heart failure after atrial fibrillation ablation

Initial skin cancer screening for solid organ transplant recipients in the United States: Delphi method development of expert consensus guidelines

Influence of Cu + g-C₃N₄ incorporation on the photocatalytic dye decomposition of ZnO film coated on stainless steel wire meshes

Critical notes on the identity and distribution of Sonneratia griffithii Kurz (Lythraceae) in India – a critically endangered mangrove species

Effect of Substrate Temperature on Structural, Morphological, Magnetic, and Electrical Properties of Fe₂CoSi Heusler Alloy Thin Films for Spin-Based Device Applications

Concomitant preparation of ZnS thin film and nanopowder forms from SILAR baths: An attempt to sort-out wastage problem

Investigations on structural and optical properties of chalcone dendrimer in Ag@TiO₂ core–shell nanoparticles

Effect of Fe doping on the photocatalytic activity of ZnO nanoparticles: experimental and theoretical investigations

Luminescence from Zn interstitials due to combustion derived complex of Dy and Gd activated ZnO nanopowders

Solvent volume-driven CuInAlS₂ nanoflake counter electrode for effective electrocatalytic tri-iodide reduction in dye-sensitized solar cells

Enhancing the structural, optical and magnetic properties of Cu₂O films deposited using a SILAR technique through Fe-doping

Troubleshooting electromagnetic interference in a patient with centrifugal flow left ventricular assist device and subcutaneous implantable cardioverter defibrillator

Ag activated SnO₂ films for enhanced photocatalytic dye degradation against toxic organic dyes

Fabrication of Co + F Doped ZnO Films for Improved Visible Light Responsive Photocatalysis

Cost-effective fabrication of ZnO/g-C3N4 composite film coated stainless steel meshes for visible light responsive photocatalysis

Nebulizer spray-deposited CuInGaS2 thin films, a viable candidate for counter electrode in dye-sensitized solar cells

Single step transformation of urea into metal-free g-C3N4 nanoflakes for visible light photocatalytic applications

Revealing the influence of the Bi dopant on the structural, photoluminescence and antibacterial properties of ZnO nanoparticles

Cost-effective fabrication of ZnO/g-C3N4 composite thin films for enhanced photocatalytic activity against three different dyes (MB, MG and RhB)

Fabrication of ZnO:Ag/GO composite thin films for enhanced photocatalytic activity

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