Interpretation of X-ray Powder Diffraction Patterns . By H. Lipson and H. Steeple. Pp. viii + 335 + 3 plates. (Mac-millan: London; St Martins Press: New York, May 1970.) £4.

X-Ray Diffraction

Progress in preparation, processing and applications of polyaniline

Dielectric polymer nanocomposites are rapidly emerging as novel materials for a number of advanced engineering applications. In this Review, we present a comprehensive review of the use of ferroelectric polymers, especially PVDF and PVDF-based copolymers/blends as potential components in dielectric nanocomposite materials for high energy density capacitor applications. Various parameters like dielectric constant, dielectric loss, breakdown strength, energy density, and flexibility of the polymer nanocomposites have been thoroughly investigated. Fillers with different shapes have been found to cause significant variation in the physical and electrical properties. Generally, one-dimensional and two-dimensional nanofillers with large aspect ratios provide enhanced flexibility versus zero-dimensional fillers. Surface modification of nanomaterials as well as polymers adds flavor to the dielectric properties of the resulting nanocomposites. Nowadays, three-phase nanocomposites with either combination of fillers...

Recent Progress on Ferroelectric Polymer-Based Nanocomposites for High Energy Density Capacitors: Synthesis, Dielectric Properties, and Future Aspects.

The roles of green chemistry in nanotechnology and nanoscience fields are very significant in the synthesis of diverse nanomaterials. Herein, we report a green chemistry method for synthesized colloidal silver nanoparticles (Ag NPs) in polymeric media. The colloidal Ag NPs were synthesized in an aqueous solution using silver nitrate, polyethylene glycol (PEG), and β-D-glucose as a silver precursor, stabilizer, and reducing agent, respectively. The properties of synthesized colloidal Ag NPs were studied at different reaction times. The ultraviolet-visible spectra were in excellent agreement with the obtained nanostructure studies performed by transmission electron microscopy (TEM) and their size distributions. The Ag NPs were characterized by utilizing X-ray diffraction (XRD), zeta potential measurements and Fourier transform infrared (FT-IR). The use of green chemistry reagents, such as glucose, provides green and economic features to this work.

https://www.mdpi.com/1422-0067/13/6/6639/pdf

Synthesis and characterization of polyethylene glycol mediated silver nanoparticles by the green method

A unique nanostructured polyaniline (PANI)/mesoporous TiO(2) composite was synthesized and explored as an anode in Escherichia coli microbial fuel cells (MFCs). The results of X-ray diffraction, morphology, and nitrogen adsorption-desorption studies demonstrate a networked nanostructure with uniform nanopore distribution and high specific surface area of the composite. The composite MFC anode was fabricated and its catalytic behavior investigated. Optimization of the anode shows that the composite with 30 wt % PANI gives the best bio- and electrocatalytic performance. A possible mechanism to explain the excellent performance is proposed. In comparison to previously reported work with E. coli MFCs, the composite anode delivers 2-fold higher power density (1495 mW/m(2)). Thus, it has great potential to be used as the anode for a high-power MFC and may also provide a new universal approach for improving different types of MFCs.

Nanostructured polyaniline/titanium dioxide composite anode for microbial fuel cells

AC conductivity of different thin zinc oxide films measured in the frequency range of 10 Hz to 2 MHz in the temperature interval of 300 K to 575 K is reported. ZnO films were prepared by reactive r.f. magnetron sputtering from ZnO target. The experimental data reveal that a.c. conductivity is proportional to ω s . The value of s was found to be temperature dependent, decreases with increasing temperature. These observations suggest that correlated barrier hopping model is the most likely mechanism. The temperature dependence of a.c. Conductivity is expressed in power law form as σ(ω) ∝T n . The temperature exponent n is found to be increasing with increasing temperature and decreasing frequency in accordance with the narrow band limit. At high temperature the conductivity variation with frequency is comparatively small. The polaron binding energy (Wm), the height of Coulomb barrier (W) and the characteristic relaxation time (τ0) have been calculated. The values of Wm and W increase as the thickness decreases whereas the values of τ0 decrease with decreasing thickness.

Frequency Dependent Conductivity of Thin ZnO Films Prepared by R.F. Sputtering Technique

Dielectric and transport properties of copper-substituted bi-calcium phosphate nanocomposites: Its structural and microstructural evaluation

Anomalous temperature coefficient of electrical resistivity of disordered V1−xAlx and V1−xAlx−yFey alloys

The main objective of this investigation is to study the effect of samarium nanoparticles on the optical and electrical transport properties of polyaniline. Polyaniline-samarium nanocomposite has been prepared by chemical oxidative polymerization of aniline in presence of samarium nanoparticles. Average grain size lies in the range 30-40 nm. A red shift in the optical absorption is obtained. Temperature and magnetic field affect the electrical transport properties of our samples. Conductivity and magnetoconductivity have been increased with temperature.

Synthesis and Properties of Polyaniline Samarium Nanocomposite

A comprehensive study of the effect of HCl and malic acid on electrical transport properties of polyaniline has been reported. Samples are prepared by chemical oxidative polymerization of aniline. Granular morphology and better thermal stability is obtained. Temperature dependence of dc electrical transport can be explained by Mott's variable range hopping theory. Electrical transport is influenced by magnetic field. POLYM. COMPOS., 2014. © 2014 Society of Plastics Engineers

Ajit Kumar Meikap

Papers

Frequency Dependent Conductivity of Thin ZnO Films Prepared by R.F. Sputtering Technique

Dielectric and transport properties of copper-substituted bi-calcium phosphate nanocomposites: Its structural and microstructural evaluation

Anomalous temperature coefficient of electrical resistivity of disordered V1−xAlx and V1−xAlx−yFey alloys

Synthesis and Properties of Polyaniline Samarium Nanocomposite

Response of magnetic field and temperature on electrical transport of polyaniline–malic acid nanocomposite