Materials Literature
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Ultraviolet-blue upconversion (UC) radiations of Ho3+ ions at 240, 290, 360, 385, 418, 445, 485 nm were observed in hexagonal NaYF4:Yb3+∕Ho3+ powders under diode laser excitation of 970 nm. UC mechanism analyses illustrate that successive energy transfers from Yb3+ to Ho3+ generate emissions at 240, 360, 385, and 418…
Abstract Aqueous reaction of (CH 3 ) 2 SnCl 2 with Na 9 [ A ‐α‐PW 9 O 34 ] in a 3:1 ratio with [C(NH 2 ) 3 ] + as structure‐directing agent resulted in three distinct assemblies of dimethyltin‐functionalized tungstophosphates depending on the pH: [{(CH 3 ) 2 Sn(H 2 O)}{(CH 3 ) 2 Sn}( A ‐α‐PW 9 O 34 )] 5– ( 1 ) at pH =…
High-density arrays of highly ordered ferritin nanocages are fabricated through the guided assembly of thiol-modified ferritin on prepatterned gold nanodots, which are prepared by block copolymer micelle lithography. One and only one ferritin nanocage is anchored to each gold nanodot, as confirmed by scanning electron…
Abstract Precipitated silica (SiO 2 ) is industrially produced by mixing a silicate solution with acid in a semi‐batch process. Polycondensation of monomeric silica leads to the formation of particles which aggregate and eventually form a particulate gel. However, this is instantly fragmented by the mechanical energy…
In this paper we aim at presenting a full-VB (valence-bond) analysis of the DFT broken symmetry (BS) exchange coupling constant J(BS). We extend Kahn and Briat's "two sites-two electrons" VB original formalism (Kahn, O.; Briat, B. J. Chem. Soc. Farady Trans. II, 1976, 72, 268) by taking into account the covalent-ionic…
The design and synthesis of novel three-dimensional (3-D) supramolecular dendrimers is described. The coordination-driven self-assembly of a 120 degrees diplatinum acceptor and tritopic pyridyl donors bearing [G-0]-[G-3] Fréchet-type dendrons results in a series of supramolecular dendrimers under mild conditions, poss…
Stabile micellare Strukturen entstehen bei der vorgestellten Selbstorganisation mit Cysteinresten an der Schnittstelle zwischen den Blöcken (siehe Bild). Die Selbstorganisation der erhaltenen Copolypeptide führt zu einer neuen Klasse von Protein-Nanopartikeln mit Anwendungspotenzial im Wirkstofftransport und in der Bi…
This paper reports on the first attempt to enclose diamond nanoparticles--produced by detonation--into a Kevlar matrix. A nanocomposite material (40 wt% diamond) was prepared by precipitation from an acidic solution of Kevlar containing dispersed nanodiamonds. In this material, the diamond nanoparticles (Ø = 4 nm) are…
Abstract Lagrangian variational approach is employed to derive the equations of equilibrium of strain‐gradient elasticity. For a periodic lamellar‐morphology strain‐gradient medium, we present an exact formula for the overall, system stiffness. We compare the formula with direct atomistic estimates of stiffness of bin…
A Ag(I) complex was prepared from azobenzenonaphthalenophane as a photoreactive multidentate ligand. The coordination of Ag(I) was reversibly controlled by photoisomerization of the azobenzene unit, and at the same time, Ag(I) accelerated the Z-E thermal isomerization of the azobenzene unit.
The effects of electron beam irradiation of (ethylene vinyl acetate) EVA containing 18% vinyl acetate was studied. The EVA sample was then irradiated by using 3 MeV electron beam machine at doses ranging from 120 to 360 kGy in air at room temperature and analyzed for mechanical, thermal and electrical properties. It w…
We present a dielectric continuum model approach for studying the electrical polarization properties of interface polarization coupled ${\text{BaTiO}}_{3}$, ${\text{BaTiO}}_{3}\text{-ZnO}$, and ${\text{ZnO-BaTiO}}_{3}\text{-ZnO}$ thin-film structures consisting of several hundred nanometer thick layers. Our model augm…
Hohle Cu2O-Nanostrukturen einheitlicher Größe (siehe SEM-und TEM-Bilder) wurden durch oxidatives Ätzen von gekappt-oktaedrischen Vorstufen erhalten. Ein besonderes Merkmal der Nanohohlkörper ist das Fehlen der sechs {100}-Flächen. Die Strukturen sind vielmehr aus acht hexagonalen {111}-Flächen konstruiert, von denen e…
The effect of different oxidation and reducing pretreatments on dendrimer-encapsulated platinum nanoparticles (Pt-DENs) dispersed on a high-surface-area sol-gel-made silica support was assessed by evaluating the capacity of the resulting catalysts to adsorb CO, NO, and acetylene using IR absorption spectroscopy. The u…
Abstract Acquiring materials that simultaneously meet two or more conflicting requirements is very difficult. For instance, a situation wherein the color chromaticity and photoluminescence (PL) intensity of phosphors conflict with one another is a frequent problem. Therefore, identification of a good phosphor that sim…
Core P(MAOETIB-GMA) microparticles of 40-200 microm were prepared by suspension copolymerization of the iodinated monomer 2-methacryloyloxyethyl (2,3,5-triiodobenzoate), MAOETIB, with a low concentration of the monomer glycidyl methacrylate, GMA, which formed hydrophilic surfaces on the particles. Magnetic gamma-Fe(2)…
Abstract The effect of high‐pressure processing (HPP) on the total migration into distilled water and olive oil and on the barrier properties of four complex packaging materials were evaluated. The films were polyethylene/ethylene‐vinyl‐alcohol/polyethylene (PE/EVOH/PE), metallized polyester/polyethylene, polyester/po…
Zigzag graphene nanoribbons can have magnetic ground states with ferromagnetic, antiferromagnetic, or canted configurations, depending on carrier density. We show that an electric field directed across the ribbon alters the magnetic state, favoring antiferromagnetic configurations. This property can be used to prepare…
A novel polar oxide of ZnSnO3 with LiNbO3-type structure has been investigated using first-principles density functional theory. The calculated pressure dependence of the phase stability in the ternary Zn2+Sn4+O2− system confirms the experimental results and detailed mechanism of the pressure-induced phase transitio…
Nanocrystalline Nd(2)Fe(17) powders have been obtained by means of high-energy ball milling from nearly single-phase bulk alloys produced by arc melting and high temperature homogenization annealing. The rhombohedral Th(2)Zn(17)-type crystal structure of the bulk alloy remains unaltered after the milling process, with…