Materials Literature
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Abstract The protonation constants of DMPDTA (H 4 DMPDTA = 2,2‐dimethylpropylenediamine‐ N , N , N′ , N′ ‐tetraacetic acid) and the stability and protonation constants of its Ln 3+ and some divalent metal complexes have been determined by pH potentiometry and spectrophotometry (Cu 2+ ) and compared with the correspond…
The relationship between the composition and structure for the glasses of general composition (40-y)Na 2 O-yFe 2 O 3 -5Al 2 O 3 -55P 2 O 5 (5≤y≤20), has been studied. The chemical durability and density of these glasses increase with increasing Fe 2 O 3 content. The dissolution rate (D R ), calculated from the weight…
The results of X-ray studies of the nine members (4 ÷ 12) of the 4-bromobenzylidene-4′-alkyloxyaniline homologous series (nBBAA) in smectic B (SmB) and smectic A (SmA) phases are presented. Interestingly, no SmC phase was identified. The thickness of smectic layers in the SmA and SmB phases was estimated showing unexp…
An attractive feature of the Galfenol alloy system is the ability to impart enough uniaxial anisotropy into the alloy such that no pre-load mechanism is required to attain saturation magnetostriction. Stress annealing is typically employed to generate this anisotropy. Recent published results indicate that magnetic fi…
Nanocrystalline cellulose solid films derived from spruce pulp exhibit iridescence when cast from chiral nematic aqueous phase suspensions of the nanocrystals. Iridescence is a color travel phenomenon that might have potential for overt encryption as an anti-counterfeiting measure. The iridescent phase also offers an…
The restructuring of epitaxial ultrathin BaTiO 3 films on a Pt(111) substrate upon high‐temperature treatment has been studied by scanning tunneling microscopy, low‐energy electron diffraction, and XPS. Upon annealing ultrathin BaTiO 3 films up to 4 monolayer equivalents in thickness at 1150 K in vacuum, BaTiO 3 forms…
Abstract Aqueous solutions of PVA containing the biocide AquaQure are electrospun into nanofibrous membranes with antimicrobial properties. AquaQure contains, amongst others, Cu 2+ and Zn 2+ ions. Fibre morphology is observed under a scanning electron microscope, and effects of instrument parameters and solution chara…
Abstract Halloysites (HNTs) core‐polypyrrole(PPy) shell composite particles were fabricated by in situ oxidative polymerization of the pyrrole monomer absorbed HNTs nanotubes, obtained by the dispersion of HNTs in acid aqueous solution of pyrrole with ultrasonic irradiation and magnetic stirring, by using ammonium per…
Abstract Composites of polypropylene (PP) and crystalline cellulose were prepared after modification of the host matrix by reactive extrusion grafting of maleic anhydride. Acid, alkali, and mechanical treatment of wood flour (WF) was conducted to obtain a suspension of micro‐ and nanocrystalline cellulose. Layered sil…
Cynandione A, an acetophenone from the roots of Cynanchum auriculatum and other species in the genus attenuates neurotoxicity of a variety of neurotoxic agents such as l-glutamate in vitro. In this study, we sought to further characterize the neuroprotective effects of cynandione A and other acetophenones from the roo…
Two mesogenic homologous series of H-shaped symmetrical dimers were synthesised and their thermotropic properties studied by differential scanning calorimetry and on a hot-stage of a polarising microscope. These compounds consisted of two mesogenic units of azoester interconnected through tetramethylene flexible space…
Pr 0,7 Ca 0,3 Mn 1−y Cr y O 3 compounds (with 0≤y≤0.20) have been prepared by means of the solid-state reaction, from stoichiometric powder mixtures of binary oxides, at high temperatures in ambient air. The samples were studied by X-ray powder diffraction analysis. The structural refinement using the Rietveld method…
Abstract In this study, conductive composites of methyl vinyl silicone rubber (MVQ) filled with nickel‐coated graphite (NCG) were prepared. The effects of the storage time, aging time, stretching, neutral‐salt spraying, and acid‐salt spraying on the electrical conductivity of NCG/MVQ were investigated. The results ind…
One and two dimensional grating structures with submicron period have a huge number of applications in optics and photonics. Such structures are conventionally fabricated using interference or e-beam lithography. However, both technologies have significant drawbacks. Interference lithography is limited to rather simpl…
The O–O and Al–O weighted partial structure factors were incorrectly labelled in both figures 4 and 5 of the original version of the paper; see the PDF for the correct figures.
The photocatalytic activity of gold deposited on Degussa P25 titanium dioxide (Au-DP25) in the photodegradation of methyl orange (MO) was investigated. The as-prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectroscopy (DRS) techn…
Low-frequency Raman-scattering spectra are presented for gold nanocrystals with diameters 3.5 and 13 nm. The frequencies of the Raman peaks but also their number are shown to vary with the nanocrystal size. These results are analyzed using both the continuous elastic medium approximation and an atomistic approach. We…
A pseudopotential method is utilized to study the critical stability of model anions formed by long-range quadrupolar molecular potentials. Results indicate that critical quadrupole moments of simple point-charge triads do not serve well as predictors of real quadrupole-bound anions of systems with negative moments.
A technique for the quantification of equilibrium grain boundary segregation by high resolution secondary ion mass spectroscopy (NanoSIMS) on simple metallographically polished surfaces has been demonstrated for the model system of sulphur segregation to nickel grain boundaries. Samples of nickel containing 5.4 wt ppm…
This paper presents a study on polycrystalline diamond (PCD) polished by dynamic friction polishing (DFP) with the aid of advanced dual beam FIB (focused ion beam) microscopy. After disclosing a variety of wear tracks by DFP using electron imaging in combination with the ion channelling effect, a dual beam FIB was suc…