Materials Literature
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We report on fabrication and investigation of optical and morphological properties of highly efficient (a quantum yield of 1%) upconversion polymer-inorganic nanocomposite thin film emitters prepared by the new technique of double beam matrix assisted pulsed laser evaporation (DB-MAPLE). Polymer poly(methyl methacryla…
Using the change in the intrinsic optical properties of YMg-based thin films upon exposure to hydrogen, we observe the presence of hydrogen at concentrations as low as 20 ppm just by a change in color. The eye-visible color change circumvents the use of any electronics in this device, thereby making it an inexpensive…
Abstract The possible use of group 4 metallocene cations as neutralizers for some energetic molecules has been assessed using quantum chemical calculations. In particular, titanocene, zirconocene, and hafnocene methyl cations were tested as neutralizers for FOX‐7, an energetic molecule that has been synthesized in 199…
Ferromagnetic SrFe 12 O 19 –ZnFe 2 O 4 nanostructure composite particles were synthesized by co-precipitation of chloride salts, in different stoichiometric ratios, by addition of sodium hydroxide solution. The resulting precursors were heat treated at temperatures in the range 800–1200°C for 4 h. Exchange interaction…
The conditions for bulk silicon crystal growth were examined using the mirror-shifting-type infrared convergent-heating floating zone method. The positions of the mirror-lamp (M-L) systems were systematically shifted to find a suitable position along a horizontal plane, from positions close to the molten zone to those…
Ultrathin silver films (thickness below 10 nm) are of great interest as optical coatings on windows and plasmonic devices. However, producing these films has been a continuing challenge because of their tendency to form clusters or islands rather than smooth contiguous thin films. In this work we have studied the effe…
Targeting lightweight concepts, research activities in the fields of automotive engineering, aerospace engineering as well as civil engineering are focusing on the development of high-strength and high-rigidity composite materials. Such composites are to be used where properties of conventional materials are not able…
Abstract A new phase in the system Sc‐Ta‐O‐N was synthesized by reaction of an amorphous oxide precursor with a gaseous NH3/O2 mixture at 800 °C. Crystal structure determination was performed using X‐ray powder data. ScTa2O5N crystallizes in the tetragonal space group P42/mnm (rutile‐type structure) and exhibits a bri…
This study was carried out to judge the effect of carbohydrate (chitosan, alginate and starch) and protein based (soya and whey) edible coatings on shelf life of cherries. During the study cherries were coated with 1, 2 and 3% of chitosan, alginate, starch, soya and whey protein coatings and the coated cherries were s…
Aluminium ion (Al3+) toxicity and hydrogen ion (H+) activity are the major constraints for plant growth in acid soil. This study was undertaken to determine the effect of pH and Al on the growth response and changes in root morphology of Al-tolerant (ET8) and Al-sensitive (ES8) wheat seedlings. Different levels of AlC…
Two [FeLn2 Fe(μ3 -OH)2 (teg)2 (N3 )2 (C6 H5 COO)4 ] compounds (where Ln=Y(III) and Dy(III) ; teg=triethylene glycol anion) have been synthesized and studied using SQUID and Mössbauer spectroscopy. The magnetic measurements on both compounds indicate dominant antiferromagnetic interactions between the metal centers. An…
Up to now simulation of perfect crystal optics in the “Synchrotron Radiation Workshop” (SRW) wave-optics computer code was not available, thus hindering the accurate modelling of synchrotron radiation beamlines containing optical components with multiple-crystal arrangements, such as double-crystal monochromators and…
Poly(vinyl alcohol)/maleic anhydride/acryloyl thioamide monomer (PVA/MA/ATM) photo-cured nanofiber membranes and pure PVA nanofiber membranes were produced by electrospinning technique. In situ UV radiation was applied during the electrospinning in order to provide polymerization during the jet flight and promote cros…
In the present work, the conductive nanocomposite of poly(p-phenylenediamine)(PpPD)/exfoliated graphene nanoplatelets (GNPs) are synthesized via in situ polymerization under acidic conditions by doping different percentages of GNPs. The interactions between PpPD and GNPs are investigated by utilizing infrared spectra…
Large‐scale two‐component (2c) relativistic quantum‐chemical (RQC) theory is reviewed. We briefly discuss the theories, advantages, and extensibilities of an overall linear‐scaling scheme in 2c relativistic theory. The theory is based on the infinite‐order Douglas–Kroll–Hess method, with the local unitary transformati…
In the present work, we measure the temperature dependent electrical resistivity from 300K down to 2K under applied hydrostatic pressure of upto 2.5GPa for SrFBiS2, which is the parent compound for the BiS2 based superconductors. Though the normal state resistivity of the compound decreases with pressure, the same is…
The microstructure and tensile properties of cast Al–9·5Si–0·35Mg alloy containing 1·5 wt-Fe have been studied to investigate the potential influence of beryllium (Be) on the entrained oxide films and its effects on the precipitation of Fe-rich phases from liquid metal. It was found that addition of Be has a great inf…
Abstract The quest for low cost solar cells has resulted in attempts to use lower purity silicon rather than conventional electronic grade material. The metallic content of such ‘solar silicon’ is usually much higher than electronic grade material and this compromises the efficiency of photovoltaic conversion via a va…
We study the geometrical confinement effect in Bi22Sr22CaCu22O8+δ8+δ mesoscopic vortex matter with edge-to-surface ratio of 7–12 %. Samples have in-plane square and circular edges, 30 μm widths, and ∼2 μm thickness. Direct vortex imaging reveals the compact planes of the structure align with the sample edge by introdu…
Zinc zirconate composite nanorods (ZZCN) having about 75 nm diameters were synthesized via a sol-gel reaction of equimolar of zinc chloride and zirconium oxychloride, in the presence of nitric acid and acetyl acetone. The as-prepared zinc zirconate composite nanorods were characterized by means of X-ray diffraction (X…