RAMANA RAMYA
@perio.sdc.saveetha.com
Assistant Professor Department of Periodontics
saveetha dental college and hospitals
RESEARCH, TEACHING, or OTHER INTERESTS
Biomaterials, Ceramics and Composites, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
S. Priyadharshini, Saheb Ali, and J. Ramana Ramya
Elsevier BV
S. Sathish, Thanigai Arul Kumaravelu, Cheng-Jie Yang, Ramana Ramya Jayapalan, R. Nirmala, Chung-Li Dong, Bi-Hsuan Lin, and R. Navamathavan
Elsevier BV
Ramana Ramya Jayapalan, Thanigai Arul Kumaravelu, Karthikeyan K.R., Nabhiraj P.Y., Krishna J.B.M., Kaarthikeyan G., Sathiamurthi P., Gajendiran J., Chung-Li Dong, and Narayana Kalkura S.
Elsevier BV
C. Hazarathaiah Yadav, J. Gajendiran, S. Gnanam, J. Ramana Ramya, S. Monisha, S. Selvalakshmi, K. Ramachandran, S. Gokul Raj, and G. Ramesh Kumar
Elsevier BV
Monica Susai Mary S., S. Malathi, Sudha Varadharaj, K. Thanigai Arul, Rama Shanker Verma, J. Ramana Ramya, K. Asokan, J.B.M. Krishna, S. Narayana Kalkura, and Moorthy Babu S.
Elsevier BV
J. Ramana Ramya, K. Thanigai Arul, K. Asokan, J. Gajendiran, Chung-Li Dong, and R. Ilangovan
Elsevier BV
P. Prameela, J. Ramana Ramya, J. Gajendiran, S. Gnanam, K. Ramachandran, S. Gokul Raj, and G. Ramesh Kumar
Elsevier BV
Kurinjinathan Panneerselvam, Anita R Warrier, Thileep Kumar K, Roselin Ranjitha Mathiarasu, Raghu Subashchandrabose, Yu-Cheng Huang, Thanigai Arul Kumaravelu, Chung-Li Dong, Asokan Kandasami, and Ramana Ramya Jayapalan
Elsevier BV
Ramasamy Venkatapathy, J. Ramana Ramya, V. C. Bharath Sabarish, J. Gajendiran, A. Durairajan, M. P. F. Graça, M. A. Valente, S. Gokul Raj, and G. Ramesh Kumar
Wiley
AbstractThin films and nanocrystalline powders of BiFeO3 (BFO) are prepared from pulsed laser deposition (PLD) and sol–gel process, respectively. Their grain sizes, microstrain, morphological features, leakage current characteristics, and photoluminescence (PL) emission behavior are investigated and compared with each other. X‐ray diffraction (XRD) technique has been utilized to compute the grain sizes and crystalline strain values for the thin films and nanopowders of BFO through Williamson–Hall (W–H) plots. XRD and Raman peaks of the deposited thin film and synthesized nanopowders of BFO confirm the formation of rhombohedral unit cell character and its vibrational structure. Topographical analysis of nanopowders and thin films of BFO from scanning electron microscopy (SEM) and atomic force microscopy (AFM) measurements reveals the spherical morphology of grown particles. Suppression of emission peaks, as noticed from PL spectra for BFO nanopowders and thin film, indicates the possible electron defect level transitions due to oxygen vacancies. Leakage current density studies suggest the detectable flow of current in both study of specimen.
S. Dinagaran, J. Gajendiran, S. Gokul Raj, S. Gnanam, J. Ramana Ramya, S.Rafi Ahamed, and C. Esther Jeyanthi
Elsevier BV
C. Vinoth, J. Ramana Ramya, J. Gajendiran, S. Gnanam, S. Gokul Raj, G. Ramesh Kumar, and M. Karthikeyan
Elsevier BV
J. Gajendiran, S. Gnanam, V.P. Senthil, J. Ramana Ramya, K. Ramachandran, V. Vijayakumar, S. Gokul Raj, G. Ramesh Kumar, and N. Sivakumar
Elsevier BV
J. Ramana Ramya, K. Thanigai Arul, R. Ilangovan, P. Sathiamurthi, K. Asokan, Chung-Li Dong, A. Arockiarajan, and S. Narayana Kalkura
Elsevier BV
Gouri Deshpande, Jayashree Tonannavar, J. Tonannavar, Siddanagouda B. Patil, Vinay S. Kundargi, Santosh Patil, B.G. Mulimani, S. Narayana Kalkura, J. Ramana Ramya, and K. Thanigai Arul
Elsevier BV
J. Gajendiran, S. Gokul Raj, G. Ramesh Kumar, S. Gnanam, J. Ramana Ramya, and V. P. Senthil
Springer Science and Business Media LLC
Abstract In this work, BiFeO 3 and BiFeO 3 -CoFe 2 O 4 bioceramic compounds were investigated and their photoluminescence (PL) characteristics and antimicrobial activity were compared in detail. The crystallite size, crystalline strain, and optical band gap of the compounds were estimated using the Williamson-Hall (W-H) plot, which was derived from powder x-ray diffraction patterns. The W-H plot revealed that the crystallite size increased and the crystalline strain value decreased for the BiFeO 3 -CoFe 2 O 4 when compared to pure BiFeO 3 . The formation of a binary phase structure was confirmed by the Raman spectrum of the synthesized composite material. In the PL analysis, weak PL visible emission bands were observed for both the pure and composite samples, indicating that fewer oxygen vacancy defects occurred. The antimicrobial activity of pure BiFeO 3 and BiFeO 3 -CoFe 2 O 4 was investigated in detail, and the results are discussed. Graphic Abstract
Maalavika S Iyer, Fu-Ming Wang, Ramana Ramya Jayapalan, Subha Veeramani, and Ilangovan Rajangam
Elsevier BV
S. Gnanam, J. Gajendiran, R. Ashokkumar, K. Ramachandran, and J. Ramana Ramya
Elsevier BV
Abstract In this paper, we present Cd doped alpha-dimanganese trioxide (Cd-A-DMTO) nanoparticles developed with the particle size of 25-28 nm via the sol-gel technique. The effects of 1-3% Cd concentrations on the crystal structure, size and strain, lattice constant, interplanar distance and unit cell volume values of the alpha-dimanganese trioxide (α-Mn2O3) samples were compared with the powder X-ray diffraction (XRD) results. The crystallite sizes are computed using the Scherrer's formula and the Williamson-Hall (W-H) plot using the XRD data for the Cd-A-DMTO samples, and their values are comparatively discussed. The powder XRD, and Raman spectral studies have shown the formation of the single crystalline cubic bixbyite phase of the prepared Cd-A-DMTO samples. Structural behaviour was investigated for the prepared Cd-A-DMTO samples by the Fourier Transform Infrared (FT-IR). The energy dispersive X-ray (EDX) analysis shows that the Cd has been incorporated into the manganese oxide. The spheres/rods, spindles/spheres and hexagonal/sphere-like particles are found in the 1%, 2% and 3% Cd-A-DMTO samples in the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analyses. Superparamagnetic behavior of the Cd-A-DMTO samples was detected by the Vibrating Sample Magnetometer (VSM). The optical band gap increased and the PL emission intensity decreased with an increase in the concentration of the Cd dopant on the manganese oxide samples in the UV absorption and photoluminescence (PL) emission spectra. The photodegradation of the Congo red (CR) dye showed that the 3% Cd-A-DMTO photocatalyst had greater photocatalytic degradation efficiency and a rate constant compared to the 1% Cd-A-DMTO sample. The antibacterial activity of the Cd-A-DMTO samples was examined using selected bacterial pathogens.
K. Thanigai Arul, E. Manikandan, J. Ramana Ramya, K. Indira, U. Kamachi Mudali, M. Henini, K. Asokan, Chung-Li Dong, and S. Narayana Kalkura
Elsevier BV
Abstract Nitrogen ions (70 keV) were implanted on composite coatings containing polymer/Mg (magnesium)–Ag (silver) ions co-incorporated hydroxyapatite which was developed using microwave irradiation. Average crystallite size of modified coatings is reduced by 80% compared to the pristine. The variation of atomic bond strength of modified coatings is realized. The electrical resistance (77%), microhardness (4.3%), roughness (4.5 times) and pore size are enhanced on the nitrogen implanted coatings. Superhydrophilic surface is turned to hydrophobic on implantation. At higher fluence (1 × 1017 ions/cm2) depicted an enhanced corrosion potential compared to the other coatings. Thus, the new insight on modified coatings is elucidated by correlating phase-structure, surface and corrosion resistance.
S. Gnanam, J. Gajendiran, J. Ramana Ramya, K. Ramachandran, and S. Gokul Raj
Elsevier BV
Abstract Pure and europium doped cerium dioxide (CeO2) nanoparticles were synthesized for the first time via glycine-assisted hydrothermal process and comparatively investigated their structural, optical, photoluminescence, photocatalytic and antibacterial properties. The synthesized pure cerium dioxide (PCDO) and Eu3+ doped cerium dioxide (ECDO) samples were subjected to the powder XRD, W-H plot, TEM, EDX, XPS, UV-visible, PL, photocatalytic and antibacterial studies. Based on the above analysis, ECDO found relatively smaller size, higher band gap and oxygen vacancy defects, better photocatalytic degradation and antibacterial properties compared to the PCDO sample. Moreover, the ferromagnetism characteristics of the ECDO were found in the M-H loop.
Nivethaa E A K, Baskar S, Catherine Ann Martin, Ramana Ramya J, Stephen A, Narayanan V, Lakshmi B S, Olga V. Frank-Kamenetskaya, Subathra Radhakrishnan, and Narayana Kalkura S
Springer Science and Business Media LLC
AbstractDrug resistance and damage caused to the normal cells are the drawbacks which have limited the use of the existing effective anticancer drugs. Attainment of a steady and extended release by encapsulating dual drugs into biocompatible and biodegradable vehicles is the key to enable the use of these drugs for effective inhibition of cancer. In this study, carboxymethyl chitosan (CMCS), a proficient water-soluble derivative of chitosan has been synthesized using chemical route and used for the delivery of 5-Fluorouracil and doxorubicin individually as well as in combination. Carboxymethylation occuring at –NH2 and OH sites of chitosan, has been confirmed using FTIR. EDX and Fluorescence studies elucidate the encapsulation of 5-Fluorouracil and doxorubicin into CMCS. The capability of CMCS to release the drugs in a more sustained and prolonged manner is evident from the obtained release profiles. About 14.9 µg/ml is enough to cause 50% cell death by creating oxidative stress and effectuating DNA fragmentation. Amidst the existing reports, the uniqueness of this work lies in using this rare coalition of drugs for the suppression of breast cancer and in reducing the side effects of drugs by encapsulating them into CMCS, which is evidenced by the high hemocompatibilty of the samples.
J. Gajendiran, S. Gnanam, V. Vijaya Kumar, K. Ramachandran, J. Ramana Ramya, S. Gokul Raj, and N. Sivakumar
Elsevier BV
Abstract The mixed morphology of semiconducting metal sulfide nanostructured materials has been the hotspot of research. In this paper, we have reported the sugar assisted hydrothermal method, applied to prepare spherical/flake surface morphology of ZnS nanostructures. The crystal structure, surface morphology, light absorption, energy gap, emission peak, surface defects and photocatalytic properties of ZnS materials have been examined through the XRD, SEM, TEM, UV–visible, FL and photocatalytic studies. A solution of methyl orange dye is mixed with prepared ZnS samples under the illumination of UV-light; the photocatalytic degradation absorption, and efficiency have been estimated from the optical spectra of this mixtures.
S. Amudha, J. Ramana Ramya, K. Thanigai Arul, A. Deepika, P. Sathiamurthi, B. Mohana, K. Asokan, Chung-Li Dong, and S. Narayana Kalkura
Elsevier BV
J. Ramana Ramya, K. Thanigai Arul, K. Asokan, and R. Ilangovan
Elsevier BV
J. Gajendiran, V. Vijayakumar, V.P. Senthil, C. Parthasaradhi Reddy, J. Ramana Ramya, and S. Gokulraj
Elsevier BV