Materials Literature
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Abstract Polylactide/organic montmorillonite (PLA/OMMT) nanocomposites were prepared by melt‐compounding technique. Dynamic and steady rheological properties, as well as dynamic mechanical and thermal stability of the nanocomposites were evaluated using various characterization tools. It was found that the rheological…
Emission and excitation spectra of CaF2, SrF2, BaF2doped with Nd3+, Sm3+, Ho3+, Er3+, Tm3+excited by vacuum ultraviolet photons or by x-rays were studied. Decay times of the Nd3+emission near 180 nm at 7 K were 17.7, 15.3, 12.3 ns in CaF2, SrF2, BaF2respectively. 4fn-1 5d1-4fnluminescence bands were found at 170-200 n…
Abstract Improvement in rubber–filler interaction is desirable for rubber technologists due to its influence on numerous properties of rubber compounds and vulcanizates. In practice, there are coupling agents commercially available for the improvement of silica–rubber interaction. Surprisingly, only a limited number o…
A direct study of the shape, size and connectivity of nonordered pores in carbon materials is particularly challenging. A new method that allows direct three-dimensional (3D) investigations of mesopores in monolithic carbon materials and quantitative characterization of their physical properties (surface area and pore…
The emerging field of nanotechnology is mostly focused on carbon and inorganic based nanomaterials, such as carbon nanotubes, graphene, transition metal nanotubes and nanowires (Iijima, 1991; Tenne et al., 1992; Endo et al., 1996; Dresselhaus et al., 2001). Systems containing aluminosilicates have been investigated as…
Undercover-Agens: Graphen wurde verwendet, um Reaktionen an Grenzflächen unter Graphenbedeckung zu visualisieren. Unter einer CO-Atmosphäre dringt CO in die Graphen/Pt(111)-Grenzschicht ein und reagiert dort mit O2, während interkaliertes CO von der Pt-Oberfläche desorbiert.
A unique approach has been developed to deposit ZnO with tunable morphology and physical properties by introducing methanol in an electrochemical process. As the methanol increases in the aqueous electrolyte, the growth mode of ZnO transforms from thin films to nanostructures, corresponding to a crystalline orientatio…
The creation of caged molecules involves the attachment of protecting groups to biologically active compounds such as ligands, substrates and drugs that can be removed under specific conditions. Photoremovable caging groups are the most common due to their ability to be removed with high spatial and temporal resolutio…
A quantitative method for analysis of fast Mn 2+ -centered Auger processes in Mn 2+ -doped semiconductors is introduced. Analytical expressions have been derived that describe the Coulomb (″direct″) and exchange (″sp–d″) contributions to Mn 2+ -electron Auger de-excitation rate constants. All of the quantities in thes…
Thermoresponsive polymer gels exhibit pronounced swelling and deswelling upon changes in temperature, rendering them attractive for various applications. This transition has been studied extensively, but only little is known about how it is affected by nano- and micrometer-scale inhomogeneities in the polymer gel netw…
Based on atomistic molecular dynamics (MD) simulations, the small angle neutron scattering (SANS) intensity behavior of a single generation-4 polyelectrolyte polyamidoamine starburst dendrimer is investigated at different levels of molecular protonation. The SANS form factor, P(Q), and Debye autocorrelation function,…
We report a computational study on the spontaneous self-assembly of spherical particles into two-dimensional crystals. The experimental observation of such structures stabilized by spherical objects appeared paradoxical so far. We implement patchy interactions with the patches point-symmetrically (icosahedral and cubi…
The Schiff bases, L 1 , L 2 , and L 3 , are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give comp…
An unusual designated-tailoring on zone-axis preferential growth of surfactant-free ZnO mesocrystals with different features (shapes and sizes) was successfully achieved via an additive-free complex-precursor solution method. The formation of ZnO mesocrystals here is essentially determined by the characteristic of [Zn…
Here, we report the discovery and characterization of biominerals in the acorn worms Saccoglossus bromophenolosus and Ptychodera flava galapagos (Phylum: Hemichordata). Using electron microscopy, X-ray microprobe analyses and confocal Raman spectroscopy, we show that hemichordate biominerals are small CaCO(3) aragonit…
Abstract This paper describes the production of conducting polypyrrole (PPy) thin films by plasma‐enhanced chemical vapor deposition (PECVD) and its posterior use for sensing applications of carbon dioxide (CO 2 ). Since PECVD yields the non‐conducting form of PPy, a doping process consisting of exposure to iodine vap…
The orientation preference of methyl-terminated thiophene oligomers inside an armchair nanotube was evaluated using density functional theory calculations with dispersion corrections (B97-D functional). According to the B97-D calculations, internal thiophene oligomers prefer to be located near the walls of the armchai…
BACKGROUND: Cellulose consisting of arrays of linear beta-1,4 linked glucans, is the most abundant carbon-containing polymer present in biomass. Recalcitrance of crystalline cellulose towards enzymatic degradation is widely reported and is the result of intra- and inter-molecular hydrogen bonds within and among the li…
We address the problem of a Coulomb impurity in graphene in the presence of a perpendicular uniform magnetic field. We show that the problem can be solved below the supercritical impurity magnitude within the WKB approximation. Without impurity the semiclassical energies correctly reproduce the Landau level spectrum.…
Nanotechnology can be used in engineering-desired textile attributes, such as fabric softness and durability in fibres, yarns and fabrics. Nanocoating the surface of socks is one approach to the production of highly active surfaces with UV blocking, antimicrobial and self-cleaning properties. Synthesis of silver nanop…