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Author

A. Ruban Kumar

Other affiliations: Jain University
Bio: A. Ruban Kumar is an academic researcher from VIT University. The author has contributed to research in topics: Dielectric & Fourier transform infrared spectroscopy. The author has an hindex of 13, co-authored 51 publications receiving 545 citations. Previous affiliations of A. Ruban Kumar include Jain University.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this paper, a new organic stilbazolium derivative crystal 2-[2-(3-hydroxy-4-methoxy-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate dehydrate (C25H23NO5S·2H2O) (VSNS) was synthesized successfully.
Abstract: A new organic stilbazolium derivative crystal 2-[2-(3-hydroxy-4-methoxy-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate dehydrate (C25H23NO5S·2H2O) (VSNS) was synthesized successfully. Single crystals were grown in a mixed solvent of methanol–acetonitrile (1 : 1) using a slow evaporation method at room temperature. Solubility of the synthesized VSNS material was experimentally determined for various temperatures using a methanol–acetonitrile mixed solvent. A single crystal X-ray diffraction study confirmed the crystal structure and morphology of VSNS. The crystalline nature of the title material was analyzed by powder X-ray diffraction analysis, and the presence of expected functional groups and the molecular structure of VSNS was identified by FT-IR and 1H NMR spectroscopic studies. Optical absorption was recorded using UV-Vis-NIR spectral analysis, and linear optical constants such as the absorption coefficient, band gap, extinction coefficient, refractive index and reflectance were calculated. The luminescence property of the crystal grown showed green emission radiation. The thermal stability of the crystal was analyzed by TG–DTA studies, and the hardness, Meyer index, yield strength, and elastic stiffness constant were estimated using a Vickers microhardness tester. Layer growth pattern was observed in chemical etching studies using a Carl Zeiss optical microscope at 50× magnification. Laser damage threshold energy was measured using an Nd:YAG laser (1064 nm). Variation of the dielectric response of the grown crystal was studied at room temperature. The third-order nonlinear optical property of VSNS was investigated in detail using a Z-scan technique with He–Ne laser at 632.8 nm. The second-order molecular hyperpolarizability γ of the crystal grown was 7.986 × 10−34 esu. This encouraging result of the Z-scan studies suggests that the VSNS crystal is a candidate material for photonics devices, optical switches, and optical power limiting applications.

145 citations

Journal ArticleDOI
TL;DR: In this paper, a spinel FeCo2O4 was synthesized by sol-gel method using succinic acid as a chelating agent at 900°C and structural, spectroscopic and morphological characterization was carried out by using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy equipped with Energy Dispersive Xray spectrometer (SEM-EDX).

51 citations

Journal ArticleDOI
TL;DR: In this article, nanostructure hydroxyapatite (HA) powders were plasma sprayed on the biomedical Cp-Ti implant surface to improve corrosion resistance, and microhardness, surface roughness values compared to uncoated surface.

39 citations

Journal ArticleDOI
TL;DR: In this article, a review of the progressive gas detection approaches accessible in literature is presented, where each gas sensing technique is analyzed based on the detection principle and is reviewed on various aspects such as gas detection, sensitivity, response /recovery time, sensor parameters, procedural complexity, detection variables, and sensor characteristics.

38 citations

Journal ArticleDOI
TL;DR: In this paper, a bilayer coating on the non-toxic commercially pure titanium (denoted as CP-Ti) implant substrate was designed and produced to improve the biocompatibility and surface properties.

36 citations


Cited by
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Journal ArticleDOI
TL;DR: This article is focused on nanosized HAp, although recent articles on microsized particles, especially those assembled from nanoparticles and/or nanocrystals, have been reviewed for comparison.

1,036 citations

Journal ArticleDOI
TL;DR: Calcium orthophosphates are of great significance for humankind and, in this paper, an overview on the current knowledge on this subject is provided.
Abstract: The present overview is intended to point the readers’ attention to the important subject of calcium orthophosphates. These materials are of the special significance because they represent the inorganic part of major normal (bones, teeth and dear antlers) and pathological ( i.e. those appearing due to various diseases) calcified tissues of mammals. Due to a great chemical similarity with the biological calcified tissues, many calcium orthophosphates possess remarkable biocompatibility and bioactivity. Materials scientists use this property extensively to construct artificial bone grafts that are either entirely made of or only surface-coated with the biologically relevant calcium ortho-phosphates. For example, self-setting hydraulic cements made of calcium orthophosphates are helpful in bone repair, while titanium substitutes covered by a surface layer of calcium orthophosphates are used for hip joint endoprostheses and as tooth substitutes. Porous scaffolds made of calcium orthophosphates are very promising tools for tissue engineering applications. In addition, technical grade calcium orthophosphates are very popular mineral fertilizers. Thus ere calcium orthophosphates are of great significance for humankind and, in this paper, an overview on the current knowledge on this subject is provided.

637 citations

Journal ArticleDOI
TL;DR: This Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting and describes the known mechanisms of optical limiting for the different types of materials.
Abstract: The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the functi...

424 citations

Journal ArticleDOI
TL;DR: In this paper, the applications of three main types of biocompatible metal, namely, stainless steels, cobalt-chromium alloys, and titanium and its alloys are reviewed.

403 citations

Journal ArticleDOI
TL;DR: This review summarizes the current state of the art for the synthesis of CaP crystals with controlled sizes from the nano- to the macroscale, and the diverse shapes including the zero-dimensional shapes of particles and spheres, the one- dimensional shapes of rods, fibers, wires and whiskers, the two-dimensionalshape of sheets, disks, plates, belts, ribbons and flakes and the three-dimensional shape of porous, hollow, and biomimetic structures similar to biological bone and tooth.

339 citations