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Author

Sampat Raj Vadera

Other affiliations: Andhra University
Bio: Sampat Raj Vadera is an academic researcher from Indian Institute of Technology, Jodhpur. The author has contributed to research in topics: Nanoparticle & Ferrite (magnet). The author has an hindex of 26, co-authored 63 publications receiving 2242 citations. Previous affiliations of Sampat Raj Vadera include Andhra University.


Papers
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Journal Article
TL;DR: In this article, Ni 1-x Zn x Fe 2 O 4 (0 ≤ x ≤ 1) nanopowders (average particle size ∼ 30 nm) have been synthesized by using a ethylenediamine tetraacetic acid precursor based method.
Abstract: Ni 1-x Zn x Fe 2 O 4 (0 ≤ x ≤1) nanopowders (average particle size ∼ 30 nm) have been synthesized by using a ethylenediamine tetraacetic acid precursor based method. The synthesized nanopowders were obtained by calcining the precursors in air at 450°C. Microstructures of the nanopowders and samples obtained on sintering have been studied by using Scanning Electron Microscopy. DC electrical resistivity was found to be ∼10 7 Ωcm for the as-synthesized nanopowders and ∼10 6 Ωcm for sintered samples. Room temperature magnetization has also been measured for all compositions and it exhibits a decrease with increasing Zn content in the samples.

1 citations

Proceedings ArticleDOI
16 Apr 1998
TL;DR: In this paper, the authors describe in-situ room temperature synthesis of composites of fine magnetic particles in the polymer matrix of aniline-formaldehyde and their characterization using Mossbauer spectroscopy.
Abstract: When materials possessing long range magnetic order (eg, ferromagnetism, antiferromagnetism and ferrimagnetism) are reduced in size they can show unique properties as compared with bulk materials One of the ways to reduce the size of the ordered magnetic regions is to isolate them inside non- magnetic species The present paper describes in-situ room temperature synthesis of composites of fine magnetic particles in the polymer matrix of aniline-formaldehyde and their characterization using Mossbauer spectroscopy© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering Downloading of the abstract is permitted for personal use only

1 citations

Journal ArticleDOI
TL;DR: In this paper, undoped and molybdenum-doped nano-TiO2 nanoparticles were synthesized by a simple and scalable wet chemical method using X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy, electron paramagnetic resistance (EPR), and ultraviolet-visible (UV-Vis) spectrograms.
Abstract: Undoped and (0.5–5 at%) molybdenum-doped TiO2 nanoparticles were synthesized by a simple and scalable wet chemical method. The as-synthesized materials were characterized using X-ray diffraction (XRD), atomic force microscopy (AFM), Raman spectroscopy, electron paramagnetic resistance (EPR), and ultraviolet-visible (UV-Vis) spectroscopy techniques. XRD studies showed the formation of crystalline anatase phase of undoped TiO2, whereas Mo-doped samples showed the formation of an amorphous phase. AFM studies showed the formation of spherical-shaped particles with a particle diameter of ∼23 nm in all samples. The photochromic behavior of these materials was studied by making their films in alkyd resin. Films of these materials showed a reversible photochromic color change from beige to brown on exposure to UV light. The coloration and bleaching process was recorded using UV-Vis diffuse reflectance spectroscopy. The maximum color change was observed in 2 at% Mo+6-doped nano-TiO2. The photochromic mech...
Journal ArticleDOI
TL;DR: The phase structure, morphology, particle size, chemical composition, and magnetic properties of the synthesized material have been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and vibrating sample magnetometer (VSM) results confirm the coating of iron oxide on hollow cenospheres as discussed by the authors.
Abstract: Core-shell material with hollow cenospheres of low density as the core has been synthesized by depositing a layer of iron oxide shell on the surface of seed hollow cenospheres The phase structure, morphology, particle size, chemical composition, and magnetic properties of the synthesized material have been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and vibrating sample magnetometer (VSM) Results confirm the coating of iron oxide on hollow cenospheres Electromagnetic characterization of synthesized core-shell material was carried out in X band Dilectric loss (tanδe) and magnetic loss (tanδm) were found in the range of ∼ 02 and 005, respectively, over 8–12 GHz Simulation studies show the effective reflection loss (RL) is more than 10 dB over frequency range 9–105 GHz at a thickness of 22 mm The low density iron oxide coated cenospheres have potential applications as microwave absorbing materials

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Journal ArticleDOI
18 Jul 2011-Small
TL;DR: The synthesis, characterization, properties, and applications of graphene-based materials are discussed and the promising properties together with the ease of processibility and functionalization make graphene- based materials ideal candidates for incorporation into a variety of functional materials.
Abstract: Graphene, a two-dimensional, single-layer sheet of sp(2) hybridized carbon atoms, has attracted tremendous attention and research interest, owing to its exceptional physical properties, such as high electronic conductivity, good thermal stability, and excellent mechanical strength. Other forms of graphene-related materials, including graphene oxide, reduced graphene oxide, and exfoliated graphite, have been reliably produced in large scale. The promising properties together with the ease of processibility and functionalization make graphene-based materials ideal candidates for incorporation into a variety of functional materials. Importantly, graphene and its derivatives have been explored in a wide range of applications, such as electronic and photonic devices, clean energy, and sensors. In this review, after a general introduction to graphene and its derivatives, the synthesis, characterization, properties, and applications of graphene-based materials are discussed.

2,246 citations

Journal Article

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1,682 citations

Journal ArticleDOI
TL;DR: The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated and it is shown that via physical compression, the microwave absorption performance can be tuned.
Abstract: The broadband and tunable high-performance microwave absorption properties of an ultralight and highly compressible graphene foam (GF) are investigated. Simply via physical compression, the microwave absorption performance can be tuned. The qualified bandwidth coverage of 93.8% (60.5 GHz/64.5 GHz) is achieved for the GF under 90% compressive strain (1.0 mm thickness). This mainly because of the 3D conductive network.

1,533 citations

Journal ArticleDOI
TL;DR: This review focuses on the recent development and various strategies in the preparation, microstructure, and magnetic properties of bare and surface functionalized iron oxide nanoparticles (IONPs); their corresponding biological application was also discussed.

1,143 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive review of the state-of-the-art research activities related to ZnS nanostructures is provided, with the focus on the critical experiments determining the electrical, chemical and physical parameters of the nanostructure, and the interplay between synthetic conditions and nanoscale morphologies.

1,090 citations