Materials Literature
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Solidification of an undercooled Lennard-Jones system is considered by atomistic and mesoscale simulations. The influence of the parameters of a Nosé–Hoover thermostat on the temperature profile in the molecular dynamics box during the free solidification of the sample is analyzed. Direct comparison of the temperature…
Abstract The polyphosphates β‐Sr(PO 3 ) 2 and BaCa(PO 3 ) 4 were doped with Eu 2+ , BaCa(PO 3 ) 4 was structurally characterised for the first time. Both phosphors were analysed by fluorescence spectroscopy. β‐Sr(PO 3 ) 2 :Eu and BaCa(PO 3 ) 4 :Eu were found to emit blue light at 424 nm and 418 nm, respectively, with…
Abstract A low power atmospheric pressure helium plasma torch was used to modify the surface chemistry of poly( α ‐methylstyrene), polystyrene, poly(propylene) and polyethylene. Mass spectra of the positive ions present in the plasma during the treatment revealed dominant ions with structures that reflected the struct…
Abstract The effects of soft‐segment molecular weight and organic modification of montmorillonite (MMT) on thermal and mechanical properties of segmented polyurethane (PU) elastomers were investigated. The PU/MMT nanocomposites were prepared by in situ polymerization, and the compositions included soft segments with n…
Abstract The effects of adhesion promoter properties on the structure and mechanical behavior of nanoclay‐filled polyolefin nanocomposites are presented. Two different maleic anhydride‐modified polypropylenes having varying maleic anhydride content and molecular weight were used. The influence of these parameters on t…
The aqueous corrosion behavior of the GeSe 4 glass composition has been studied over time under various conditions (temperature and pH). The evolution of the surface topography by atomic force microscopy and properties such as surface hardness and reduced modulus, as well as the optical transmission in the 1–16 μm win…
Abstract We have developed procedures for the synthesis of push–pull azo‐chromophores containing the s ‐triazolo[3,4‐ b ]thiadiazole heterocycle compatible with the presence of electron‐acceptor groups (nitrophenyl group) as substituents on both the triazole and thiadiazole rings. The linear and non‐linear optical pro…
Removal by the light: The photochemical regulation of restriction endonucleases, which are important enzymes in molecular biology, has been investigated. Photolabile protecting groups have been installed on DNA substrates and have been demonstrated to inhibit restriction endonuclease activity until removed by UV light…
Bent multiwall carbon nanotubes (CNTs) were grown on silicon substrate by manipulating the direction of the electric field during the growth process in the plasma enhanced chemical vapour deposition system in the presence of hydrogen and acetylene gases. Different geometries of the as-grown nanostructures were employe…
Standing room only: Dense polymer brushes can be prepared by adsorbing a diblock copolymer comprising a neutral block and a polyelectrolyte block to an oppositely charged polyelectrolyte brush (see picture). The density of the resulting neutral brush is determined by charge compensation, leading to brush densities wel…
Small amounts of impurities are always present in the raw materials for the mass production of lead zirconate titanate (PZT) ceramics. In this work, the effects of these impurities on sintering kinetics were investigated. The sintering behavior of PZT ceramics was monitored in situ by a thermo‐optical measuring device…
Homoisocitrate dehydrogenase (HIcDH) catalyzes the Mg2+- and K+-dependent oxidative decarboxylation of homoisocitrate to alpha-ketoadipate using NAD as the oxidant. A recent consideration of the structures of enzymes in the same family as HIcDH, including isopropylmalate and isocitrate dehydrogenases, suggests all of…
γ-LiAlO 2 (100) and sapphire (101̅0) substrates have been employed to grow nonpolar (101̅0) Zn 1− x Mg x O films using metalorganic chemical vapor deposition. Zn 1− x Mg x O films with various Mg contents (0 ≤ x ≤ 0.113) are obtained by adjusting the partial pressure of the Mg metalorganic precursor in gas phase. Mg a…
The finite size effects in nanoribbon graphene field-effect transistors (FETs) make the energy distribution of the channel electrons very different from that when neglecting finite size effects. Such an effect is especially obvious when the width of the graphene ribbon is a few nanometers. Thus, it results in more hig…
The influence of surface roughness on emission site density (ESD) is investigated for nanotube film emitters. An empirical expression for film emitters, [Formula: see text], where B is the intercept in the modified Fowler-Nordheim (FN) plots, A(CNT) the emission area of one site, and C related to the work function, is…
We combine first-principles, statistical, and phenomenological methods to investigate the electronic and dielectric properties of NiO and clarify the nature of the gigantic dielectric response in codoped NiO. Unlike previous models which are dependent on grain-boundary effects, our model based on small polaron hopping…
Passive oxidation of single crystal silicon carbide (6H–SiC) resulted in the formation of a vitreous silica layer which crystallized gradually at temperatures near 1300°–1400°C. During this process, statistically distributed devitrification centers appeared and disk‐like aligned crystal plates (radialites) formed. The…
A novel, simple, and feasible route for synthesizing air‐stable, water‐soluble tantalum precursors has been developed using moisture‐insensitive Ta 2 O 5 as a starting source of the Ta element, based on the conventional basic flux method. Various analytical techniques have been used to characterize the formation mecha…
A hybrid polymer-nanocrystal (NC) light-emitting diode (LED) device with a single active layer structure is simply fabricated by a spin coating. From a high-resolution transmission electron microscopy (HRTEM) study, each PVK polymer particle is observed to be capped with TPBi molecules and CdSe/ZnS NCs are mainly dist…
We report that an achiral particle with anisotropic rigidity can migrate in the vorticity direction in shear flow. A minimal "tetrumbbell" model of such a particle is constructed from four beads and six springs to make a tetrahedral structure. A combination of two different spring constants corresponding to "hard" and…