Materials Literature
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Abstract A novel ferrocene‐based epoxy compound of glycidyl ester of 1,1′‐ferrocene dicarboxylate was synthesized by the reaction of 1,1′‐ferrocene dicarboxylate and epichlorohydrin. The resultant epoxy compound showed an irreversible redox process in cyclic voltammetry (CV) measurement. The curing behavior of glycidy…
Development of synthesis protocols for realising nanomaterials over a range of sizes, shapes, and chemical compositions is an important aspect of nanotechnology. The remarkable size-dependent physico-chemical properties of nanoparticles have fascinated and inspired research activity in this direction. This paper descr…
Defence personnel face multiple threats from different quarters, like terrorist groups and rogue nations, who own not only advanced lethal weapons but also chemical and biological warfare weapons. The present day protective clothing system used by the defence sector is vulnerable to modern weapons and also have some i…
Abstract Melting behavior and crystal morphology of poly(3‐hydroxybutyrate)‐poly( D , L ‐lactic acid) (PHB‐RPLA) blends with various compositions have been investigated by modulated temperature differential scanning calorimetry (mt‐DSC), polarized optical thermomicroscopy (POTM), modulated force thermomechanometry (mf…
We have applied positron annihilation spectroscopy combined with sheet resistance measurements to study the electrical isolation of thin ZnO layers irradiated with 2 MeV ${\text{O}}^{+}$ ions at various fluences. Our results indicate that Zn vacancies, the dominant defects detected by positrons, are produced in the ir…
A new electronegativity table of elements in covalent crystals with different bonding electrons and the most common coordination numbers is suggested on the basis of covalent potentials of atoms in crystals. For a given element, the electronegativity increases with increasing number of bonding electrons and decreases…
We report optical properties of the smallest single-walled carbon nanotubes (SWNTs) with a diameter of only 3 A. These ultrasmall SWNTs are fabricated in the elliptical nanochannels of an AlPO-11 (AEL) single crystal. Polarized and resonant Raman scattering unambiguously revealed that these 0.3 nm SWNTs are of (2,2) a…
Glasses with compositions (65‐ x )Bi 2 O 3 –10B 2 O 3 –25SiO 2 – x Sb 2 O 3 /As 2 O 3 /CeO 2 ( x =0, 0.5, 1) have been prepared by conventional melt quench technique. X‐ray diffraction patterns indicated existence of Bi 0 particles dispersed in glass in the glass x =0. Great improvement in transmittance was observed b…
Abstract Nanocomposites of rigid polyurethane foam with unmodified vermiculite clay are synthesized. The clay is dispersed either in polyol or isocyanate before blending. The viscosity of the polyol is found to increase slightly on the addition of clay up to 5 pphp (parts per hundred parts of polyol by weight). The ge…
Abstract Vinyl ether polymers with imidazolium or pyridinium salt pendants underwent sensitive lower critical solution temperature (LCST)‐type phase separation in organic media. Well‐defined poly(salts) were quantitatively prepared by reaction with corresponding imidazoles or pyridines and poly(2‐chloroethyl vinyl eth…
The half-Heusler compounds NiXSn (X = Ti, Zr, Hf) are regarded as examples of materials possessing excellent thermoelectric properties. We have studied their electronic structures by photoemission spectroscopy excited by soft and hard X-ray synchrotron radiation. Although the overall features of the experimental valen…
A novel series of 1D Fe(II) metallomesogens have been synthesized using the ligand 5-bis(alkoxy)- N-(4 H-1,2,4-triazol-4-yl)benzamide (C n -tba) and the Fe(X) 2. sH 2O salts. The polymers obey the general formula [Fe(C n -tba) 3](X) 2. sH 2O [X = CF 3SO 3 (-), BF 4 (-); n = 4, 6, 8, 10, 12]. The derivatives with n = 4…
Abstract CoFe 2 O 4 hollow spheres with sizes ranging from 600 nm to 1 μm were prepared through hydrothermal treatment of an aqueous solution containing glucose, ammonium iron(II) sulfate hexahydrate [(NH 4 ) 2 Fe(SO 4 ) 2 · 6H 2 O], and cobalt(II) sulfate heptahydrate [CoSO 4 · 7H 2 O], followed by calcination. The w…
Abstract A novel two step method has been developed for the preparation of anisotropic polymer particles using soap‐free emulsion polymerization in the presence of the reactive silane coupling agent 3‐methacryloxypropyltrimethoxysilane (MPTMS). In the first step, seed polymer particles were prepared in the presence of…
A joint use of experimental and theoretical techniques allows us to understand the key role of intermediate- and short-range defects in the structural and electronic properties of ZnO single crystals obtained by means of both conventional hydrothermal and microwave-hydrothermal synthesis methods. X-ray diffraction, Ra…
The hydrothermal synthesis of barium titanate particles by reaction of titanate layered nanotubes and barium hydroxide in aqueous solution at 90, 110, and 200 °C from 1 to 24 h has been studied. Anisotropic growth of barium titanate particles was observed when the synthesis temperature was 90 °C resulting in the forma…
The role of surfactant and solvent in the size and morphology of nickel oxalate particles synthesized from reverse micelles was investigated. Nanorods of nickel oxalate with aspect ratios of 5:1 and 6:1 were formed from n -hexane and cyclohexane, respectively. Our studies show that the bulkiness of the solvent molecul…
Abstract Inorganic nano fillers have demonstrated great potential to enhance the properties of natural rubber (NR). The present article reports the successful development of a NR nanocomposite reinforced with nano silica (SiO 2 ). Its dynamic mechanical properties, thermal aging resistance, and morphology are investig…
The electronic properties of two spin-crossover compounds, namely, $\text{Fe}{(\text{phen})}_{2}{(\text{NCS})}_{2}$ and $\text{Fe}{(\text{btr})}_{2}{(\text{NCS})}_{2}{\text{H}}_{2}\text{O}$, are studied with the $\text{GGA}+\text{U}$ method taking explicitly into account the periodicity of the crystal. The magnetic st…
The effect of A‐site substitution on the piezoelectric coefficient, high‐temperature dc resistivity, and thermal depoling behavior of Aurivillius phase CaBi 2 Nb 2 O 9 ferroelectric ceramics was investigated. Ceramics with the general formula of Ca 1− x M x Bi 2 Nb 2 O 9 , where M=Na, (Na,Ce), (Na,La), and La, were pr…