Materials Literature
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We report the cobalt doping dependencies of the ferroelectric polarization and underlying incommensurate spiral magnetic ordering in multiferroic Mn<sub>1-<em>x</em></sub>Co<sub><em>x</em></sub>WO<sub>4</sub> (0 ≤ <em>x</em> < 0.18). The spiral ordering changed its rotational plane upon cobalt doping (<em>x</em> ~…
We investigate the electronic state and the superconductivity in the 5-orbital Hubbard model for iron pnictides by using the dynamical mean-field theory in conjunction with the Eliashberg equation. The renormalization factor exhibits significant orbital dependence resulting in the large change in the band dispersion a…
Abstract Cell migration plays a crucial role in a variety of physiological and pathological processes. In this study a method of capillary force lithography was used to treat poly(sodium 4‐styrenesulfonate) (PSS)/poly(diallyldimethylammonium) chloride (PDADMAC) multilayers with a PDMS stamp before or after etching by…
Abstract In this work, stereocomplex‐poly( l ‐ and d ‐lactide) (sc‐PLA) was incorporated into poly(ε‐caprolactone) (PCL) to fabricate a novel biodegradable polymer composite. PCL/sc‐PLA composites were prepared by solution casting at sc‐PLA loadings of 5–30 wt %. Differential scanning calorimetry (DSC) and wide‐angle…
ABSTRACT An anthracene‐containing poly(arylene‐ethynylene)‐ alt ‐poly(arylene‐vinylene) (PAE‐PAV) of general constitutional unit (PhCCAnthrCCPhCHCHAnthrCHCH) n bearing two 2‐ethylhexyloxy solubilizing side chains on each phenylene (Ph) unit has been synthesized and characterized. The basic electrochemical…
In this study, Schiff base monomer, 2-[(1H-pyrrol-2-yl-methylene)amino]phenol (2-PMAP) was obtained by condensation reaction of 2-aminophenol with pyrrole-2-carbaldehyde. This monomer was oxidized in an aqueous alkaline medium by NaOCl to obtain the corresponding oligomer (O-2-PMAP). The resulting compounds were chara…
A comprehensive first-principles theoretical study of the electronic properties and half-metallic nature of zigzag edge-oxidized graphene quantum dots (GQDs) is carried out by using density functional theory (DFT) with the screened exchange hybrid functional of Heyd, Scuseria and Ernzerhof (HSE06). The oxidation schem…
Hemp, jute and lyocell fibres were incorporated into polylactic acid via twin-screw extrusion using three screw configurations, with varying lengths of mixing sections, in order to reduce the levels of shear and fibre attrition. When mixing zones were reduced, the measured fibre lengths increased and as a result the t…
Kenaf and sisal fibres were selected for the development of natural fibre-reinforced thermoplastic composites because they are in abundance in South Africa. These materials can be used in the building industry, where good mechanical and fire resistance properties are required for structural and non-structural applicat…
An easy and rapid intermittent microwave heating (IMH) method was developed for the synthesis of Ag nanostructures with high yields within the short time of 2 minutes. A Ag–DT (dodecanethiol) complex with sheet-like structure was used as precursor. After an IMH treatment of the solid Ag–DT, Ag nanoparticles (NPs) with…
Perovskite oxides MTiO3 (M = Ba, Sr and Ca) with various phase, size, and shape were systematically prepared by solvothermal method in H2O/glycols mixed solutions. Shape control of the BaTiO3 and SrTiO3 particles was achieved by choice of glycols, and anisotropic rod-shaped fine BaTiO3 particles with a tetragonal crys…
Abstract Mathematical modeling for 5‐fluorouracil (5‐FU) nanoparticle synthesis via gas antisolvent (GAS) process was investigated. 5‐FU was precipitated from a dimethyl sulfoxide (DMSO) solution using CO 2 as antisolvent. The particle size was controlled by nucleation and growth rates, therefore, the kinetic modeling…
Defect rich seed mediated growth is reported for synthesising different sized ZnO QDs with enhanced and size tunable defect emission.
Hydrogen being a cleaner energy carrier has increased the importance of hydrogen-containing light metal hydrides, in particular those with large gravimetric hydrogen density like magnesium hydride (MgH2). In this study, density functional and density functional perturbation theories are combined to investigate the str…
Ordered copper integrated mesoporous silicate catalysts (CuMSC) have been synthesized by the utilization of the amphiphilic tri-block copolymer pluronic F127 as a structure directing agent (SDA) under acidic aqueous conditions. The mesophase of the materials was investigated using small-angle powder X-ray diffraction…
Oxidative degradation of copper in aqueous environments is a major concern in areas such as catalysis, electronics and construction engineering. A particular challenge is to systematically investigate the details of this process for non-ideal copper surfaces and particles under the conditions found in most real applic…
Temperature-Dependent Optical Properties of Titanium Oxide Thin Films Studied by Spectroscopic Ellipsometry, Zhang, Fan, Zhang, Rong-Jun, Zhang, Dong-Xu, Wang, Zi-Yi, Xu, Ji-Ping, Zheng, Yu-Xiang, Chen, Liang-Yao, Huang, Ren-Zhong, Sun, Yan, Chen, Xin, Meng, Xiang-Jian, Dai, Ning
Self‐assembled γ‐ Al 2 O 3 with hierarchical structure was successfully obtained via thermolysis of γ‐boehmite (γ‐ AlOOH ) particles, which was hydrothermally derived from aluminum ammonium sulfate hydrate ( NH 4 Al ( SO 4 ) 2 ·12 H 2 O ), urea, poly‐glycol ( PEG )‐2000, and deionized water. SEM observations indicate…
Dynamic hysteresis of Nb ‐doped Pb ( Zr 1− x Ti x ) O 3 ( PZT , 0.20 ≤ x ≤ 0.60) ceramics were studied systemically at different field ( E ) and frequency ( f ). The hysteresis loops were strongly dependent on E and f . The measured coercive fields ( E c0 ) were far lower than the calculated values based on the Landau…
Herein, we report a quick and simple synthesis of water-soluble gold nanoparticles using a HAuCl4 and oleylamine mixture. Oleylamine serves as a reduction agent as well as a stabilizer for nanoparticle surfaces. The particle sizes can be adjusted by modulating reaction temperature and time. Solvothermal reduction of H…