Nano-barium Titanate Research Articles

Synthesis and Characterization of Iron Doped Nano Barium Titanate Through Mechanochemical Route

Mechanochemical activation was used to prepare Fe doped barium titanate with intense milling in high energy planetary ball mill. Calcination was done at 1250°C for 30 min to obtain BaO, followed by milling with titania, at 400 rpm for 3 and 6 h. Ferric oxide was used for Fe doping. Annealing was done on the milled sample at 650, 750 and 850 °C for 3 and 6 h to generate stoichiometric compound of barium titanate phase. Fe doped barium titanate results in dense cluster of irregular polygonal shape morphology while morphology was spherical in nature for undoped sample. UV–VIS spectra analysis was carried out to determine bandgap (3.93 eV for undoped BT and 3.88 eV for Fe doped BT) followed by emission–excitation of the sample by fluorometric analysis.

Preparation and Characterization of Nano-Barium Titanate Based on Glass Fiber Filter and its Application in Preconcentration of Heavy Metals in Environmental Water

Preparation and Characterization of Nano-Barium Titanate Based on Glass Fiber Filter and its Application in Preconcentration of Heavy Metals in Environmental Water

Preparation of Silica Gel G Loaded Nano-barium Titanate and Its Adsorption Capability to Zinc in Water

Preparation of Silica Gel G Loaded Nano-barium Titanate and Its Adsorption Capability to Zinc in Water

Studies on the mechanical, thermal, and morphological properties of poly(ether ether ketone)/poly(ether sulfone)/barium titanate nanocomposites: Correlation of experimental results with theoretical predictive models

AbstractIn this study, mechanical, thermal, and morphological properties of the nanocomposites fabricated with the optimized blend of poly(ether ether ketone) (PEEK) and poly(ether sulfone) (PES) incorporated with nanobarium titanate (BT) were investigated. The optimized blend was based on the mechanical and thermal properties of the PEEK and PES in the ratio of 75 : 25 wt %. Nanoparticles were incorporated into the optimized blend with the help of twin‐screw extruder. The concentration of nano‐BT was varied from 2 to 6 wt % (0.41–1.28 vol %). With the increase in the nanosized BT concentrations, the tensile strength, tensile modulus, and elongation at break increased, whereas the crystallinity of the nanocomposites calculated by using differential scanning calorimetry method was found to decrease marginally. Morphological studies were carried out using scanning electron microscopy. The nanocomposites were evaluated by using theoretical predictive models according to “Pukanszky model” applicable to tensile strength and “Takayanagi's model” and “Guth and Smallwood model” applicable to tensile modulus. Upper and lower boundary of Hashin–Shtrikman model as well as Paul's model, applicable to tensile modulus, were also used to compare the experimental data. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Synthesis and Characterization of Nano-Barium Titanate Prepared by Hydrothermal Process

Capacitors are the most convenient and economical devices for storage of electrical energy. Performance of a capacitor is primarily governed by solid-state characteristics of its dielectric material and the explicit value of the dielectric constant. Titanate ceramics such as Barium Titanate are popular capacitor dielectric materials because of their high dielectric constant and ferroelectric properties. In recent years, extensive research work has been done on Barium Titanate for multilayer ceramic capacitor application. Barium Titanate has been synthesized from high energy ball-milling process and sol-gel process or a thermo-chemical process. However, because of contamination from the grinding media, relatively wide particle size distribution and abnormal grain growth during the sintering, other novel synthesis processes have been developed. Nano-technology based hydrothermal synthesis is one such new process. In this paper, an effort has been made to synthesize nanocrystalline Barium Titanate through hydrothermal process. Characterization of the synthesized Barium Titanate is carried out by using X-ray diffraction for crystalline structure, scanning electron microscopy for microstructure and electron dispersive spectroscopy for chemical composition. Electric properties such as dielectric constant, dielectric dissipation factor and electrical resistivity have been measured. It has been observed that dielectric constant of about 4000 and dielectric dissipation factor of below 0.3 are obtained over a wide range of frequencies. The crystallite size of the optimized material is less than 50 nm.

Implications of SPION and NBT nanoparticles upon in-vitro and in-situ biodegradation of LDPE film

Comparative influence of two nanoparticles viz. superparamagnetic iron oxide nanoparticles (SPION) and nanobarium titanate (NBT) was studied upon the in-vitro and in-situ low-density polyethylene (LDPE) biodegradation efficiency of a potential polymer-degrading microbial consortium. Supplementation of 0.01% concentration (w/v) of the nanoparticles in minimal broth significantly increased the bacterial growth, along with early onset of the exponential phase. Under in-vitro conditions, lambda-max shifts were quicker with nanoparticles and Fourier transform infrared spectroscopy (FTIR) illustrated significant changes in CH/CH2 vibrations, along with introduction of hydroxyl residues in the polymer backbone. Further, simultaneous thermogravimetric-differential thermogravimetry-differential thermal analysis (TG-DTG-DTA) reported multiple-step decomposition of LDPE degraded in the presence of nanoparticles. These findings were supported by scanning electron micrographs (SEM) which revealed greater dissolution of film surface in the presence of nanoparticles. Furthermore, progressive degradation of the film was greatly enhanced when it was incubated under soil conditions for 3 months with the nanoparticles. The study highlights the significance of bacteria-nanoparticle interactions which can dramatically influence key metabolic processes like biodegradation. The authors also propose the exploration of nanoparticles to influence various other microbial processes for commercial viabilities.

Microwave sintering of nanobarium titanate

Nanosized BaTiO3 powder was synthesized at 160 °C/45 min using the Microwave Hydrothermal (M–H) system. The nanopowder was characterized using X-ray diffraction, transmission electron microscopy, infrared spectroscopy and differential scanning calorimetry. The as-synthesized powder was microwave sintered at 950, 1050 and 1150 °C/30 min in air and for the comparison the nanopowder was also conventionally sintered at 1250 °C/3 h in air.

Microwave absorption properties of barium titanate/epoxide resin composites

Nano-barium titanate (BT) was prepared by a sol–gel method. The prepared powders were characterized by x-ray powder diffraction and transmission electron microscopy. The complex relative dielectric permittivity (ε = ε′ − jε″) and magnetic permeability (μ = μ′ − jμ″) of the BT powders were measured in the frequency range 8 ∼ 18 GHz. The BT/epoxide resin (EP) composite with different volume contents was investigated. The effects of thickness on the BT/EP composite were studied. It was found that an optimum thickness and contents of the absorber can yield the maximum reflection loss which could be obtained over a broad frequency region in the X and Ku bands. Our results indicate that BT could be a promising microwave absorption material.

Microstructure and dielectric characteristics of Ni ion doped BaTiO 3 nanoparticles

In this article, we report the effect of nickel oxide (NiO) addition on the microstructure and the dielectric properties of nano-barium titanate (BaTiO 3). Nickel ion doped barium titanate nanoparticles have been synthesized through a chemical route using polyvinyl alcohol (PVA). The concentration of Ni 2+ varies from 0 to 1.6 mol% in the specimens. The particle diameters in the specimen lie in the range of 24 nm to 35 nm. It is seen that the dielectric permittivity in doped specimens is enhanced compared to that of undoped BT ceramics. The dielectric permittivity shows maxima in the specimen containing 0.6 mol% of dopant concentration. The results are explained in terms of the change in lattice parameter c and a of the specimens.

Interrelation of Scanning Electron Micrographs with Flexural Behavior of Ferrite and Nano-Barium Titanate Reinforced Poly-Ether-Ether-Ketone (PEEK) Composites

ABSTRACT The flexural behavior of ferrite filled poly-ether-ether-ketone (PEEK) composites, with and without reinforcement of nano-barium titanate, was studied and was corroborated through scanning electron microscopy (SEM). In this study, ferrite filled PEEK, and ferrite and nano-barium titanate reinforced PEEK composites were prepared. Ferrite filled PEEK composites showed reduction in flexural strength and increase in flexural modulus with the increase in ferrite content, whereas, with the reinforcement of nano-barium titanate, flexural strength increased and flexural modulus decreased at similar ferrite content. The SEM micrographs corroborated well with flexural behavior, as ferrite particles and smooth topographic surfaces of brittle fracture were evident in the samples having higher ferrite content in ferrite filled PEEK composites, whereas, typical yield pattern of crust and trough on fractured topographic surfaces of ferrite and nano-barium titanate, reinforced PEEK composites, was visible.

Effect of nano-barium titanate on thermal stability of ferrite filled poly-ether-ether-ketone (PEEK) composites

The reinforcement of nano-barium titanate in ferrite filled poly-ether-ether-ketone (PEEK) composites caused a shift in the decomposition temperature, at which maximum mass loss occurred, to higher side and enhancement in char yield in thermogravimetric analysis. Loss tangent and glass transition temperature of ferrite filled PEEK composites were also found to be increased with the reinforcement of nano barium titanate. The effect of nano barium titanate on the melting behaviour of ferrite filled PEEK composites was negligible.