Materials Literature
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With the benefit of hindsight we can see that there is a pre-history to the field of discotic liquid crystals: theoretical and experimental papers that predate the 1977 paper in Pramana by Chandrasekhar, Sadashiva and Suresh. However, what is often forgotten is how boldly adventurous the Pramana paper was and how remo…
Bi4-xDyxTi3O12 (when x = 0, 0.25, 0.5, 0.75 and 1.0) powders and ceramics were prepared by solid-state mixed oxide method. The calcination was carried out at 900°C for 4 h with heating/cooling rate 5°C/min. The ceramics were then sintered at a temperature between 950–1100°C for 4 hrs. The optimum sintering temperature…
Incorporation of alumina (Al2O3) into a silica matrix by modified chemical vapor deposition and a solution doping technique is investigated in this study. Multiple soaking cycles were used to increase the aluminum content in the core layer. The effect of alumina retention in silica matrix soot is focused by multiple c…
Potassium niobate-based ceramics with 0.1 wt% MnCO3, K(1+x)NbO3 (KN-10000x + Mn, x = 0∼0.00096) were fabricated using KHCO3 powder as a starting material. High density ratios above 94% were obtained in all compositions. Curie temperatures Tc of Mn-doped KN-0 and KN-7 ceramics were the same at about 409°C. In addition,…
In this work, dense calcium titanate ferroelectric ceramics were successfully synthesized using the combustion technique. Urea, glycine and the mixture of urea-glycine were selected as fuels and added to the mixed powders to accelerate the chemical reaction of raw materials. The mixtures were calcined and sintered fro…
In this paper we report a facile route for synthesis of myristic acid (C13H27COOH) capped silver nanoparticles under ambient reaction conditions. AgNO3 has been reduced by NaBH4 in the presence of myristic acid in a water-methanol medium at room temperature. pH-induced optical properties of silver nanoparticle were in…
Diatoms arose from evolutionary events involving several types of organisms, i.e., non-photosynthetic organisms, bacteria, green and red algae (for a review, see Dorrell & Smith 2011). For many yea...
Environment-friendly Ferroelectric Mn:BST//Mn:BZT multilayer with additional 2% Mn doping were epitaxially fabricated on (001) MgO substrates by pulsed laser deposition with same thickness but different stacking periodic numbers or each layer thickness. Microstructure studies by X-ray diffraction and transmission elec…
Different irrigation and fertilization managements can greatly affect plant potassium (K) uptake in soils. A continuous extraction experiment was used to analyze the influence of poor-quality irrigation water on K release from soils under long-term copping with different fertilizations. The results demonstrated that K…
Drying of active pharmaceutical ingredients (APIs) is an energy-intensive process that is often a manufacturing bottleneck due to the relatively long processing times. A key objective is the ability to determine the drying end point, the time at which all solvent has been evaporated from the solid cake. In this contri…
We report optical writing at the nanometer scale of spin coated PMMA-spiropyran films. By using a near-field optical microscope, pure optical nano-writing with a resolution of 160 nm and writing speed of 0.4 µm/s was achieved. Simultaneous topographic and optical writing was also obtained by simply coupling to the nea…
Polypropylene (PP)/nano-calcium carbonate (nCC) composites modified with methacrylic acid (MA) with and without dicumyl peroxide (DCP) were prepared by a twin-screw extruder. The effects of nCC and MA on the mechanical, thermal, and rheological properties of PP/nCC composites were investigated. The mechanical tests in…
In this research, 0.94Bi0.5Na0.5TiO3–0.06BiAlO3 ceramics were prepared by the conventional solid-state reaction and the two steps sintering. X-ray diffraction analysis revealed that both samples showed a pure perovskite phase. Scanning electron microscopy study revealed that both ceramics had similar microstructure. T…
(K0.5Na0.5)(Nb0.92Sb0.03Ta0.05)O3-xmol%CuO (KNNST-xCu) piezoelectric ceramics were prepared by traditional technique. The phase structure, surface morphologies, piezoelectric constant d 33, electromechanical coupling factor k p, mechanical quality factor Q m and the dielectric loss tan δ of the specimen were investiga…
Terahertz reflectance spectra and electrical transport of CuCr1−xMgxO2 films have been studied in temperature range of 150–300 K. With increasing temperature, the phonon mode near 15 THz shows a redshift trend, and free carrier absorption below 6 THz becomes more prominent. Moreover, hole effective mass increases line…
Hydrogen bonding has been extensively used to create the mesogenic core of calamitic liquid crystals. While the field of polymeric hydrogen-bonded liquid crystals has been extensively studied, most of the research has been devoted to side chain hydrogen-bonded polymeric liquid crystals with far less effort devoted to…
The physico-chemical properties of cholesteric liquid crystals still provide new insights for researchers investigating the structure, local ordering, and phase transitions in condensed matter physics in spite of the fact that they have been known for more than a century. Among cholesterics, the micellar lyotropic cho…
Limited molecular data for marine tube-forming diatoms are available currently and this study provides the first molecular survey of these taxa. To conduct this survey, we used a molecular-assisted alpha taxonomy (MAAT) approach that utilizes DNA barcode data. We used three DNA barcode markers: the 3´ end of the large…
0.975(K0.5Na0.5)NbO3–0.025Bi0.5(Na0.9K0.1)0.5TiO3 (0.975KNN-0.025BNKT) lead-free piezoelectric ceramics were prepared, and the effects of sintering temperature on the microstructure, density, and piezoelectric properties of the ceramics were investigated. It was found that sintering densification of the ceramics occur…
In this study we demonstrate for the first time that magnetic films with a complex crystal structure, such as hexagonal barium ferrite BaFe 12 O 19, can be successfully fabricated in aqueous solutions at 60 °C by the liquid phase deposition method (LPD). Highly uniform films with a variable thickness were deposited on…