Materials Literature
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Der Unterbau ist wichtig: Au- und Cu-Nanopartikel auf CeO2(111) haben eine höhere Katalyseaktivität in der Wassergas-Shift-Reaktion als entsprechende Nanopartikel auf ZnO(000) oder die Metalle selbst (das Diagramm zeigt die Ergebnisse in Abhängigkeit von der Bedeckung mit Au-Nanopartikeln). Diese Befunde illustrieren…
Frechet-type benzyl ether dendrons of second and third generations with a carboxyl group (G2, G3) at the apex site could attach to poly(4-vinylpyridine) (PVP), forming hydrogen-bonded dendronized polymers (HB denpols) in their common solvent, chloroform. The HB denpols show unique self-assembly behavior, forming vesic…
Abstract Novel polyesterurethane/poly(ethylene glycol) dimethacrylate (PEGDMA) interpenetrating networks (IPNs) with good shape‐memory properties were synthesized using solvent casting method. The star‐shaped oligo[( rac ‐lactide)‐ co ‐glycolide] was coupled with isophorone diisocyanate to form a polyesterurethane net…
On surfaces with asymmetric "sawtooth" features, liquid slugs or drops tend to move preferentially in one direction. In this theoretical study, the imbalance of capillary forces that leads to directionally biased wetting is examined. Capillary tubes with symmetric and asymmetric sawtooth features were used to estimate…
It is currently under debate whether diamondlike BC2N may be harder than cubic BN (c-BN). Using the bond counting rule, we have performed an unconstrained search and identified a series of short period (111) superlattices that have much lower total energy than previously proposed structures. By examining the ideal str…
Skutterudite CoSb 3 polycrystalline materials were prepared using a combined process of mechanical alloying (MA) and spark plasma sintering (SPS). The influence of SPS temperature on the thermoelectric properties was focused in this work with a special emphasis on the analysis of the size effects of grains. The averag…
Abstract Little information has been published concerning the interaction of gold with polymers. In the context of this lack of information, we decided to investigate the effect of Ar plasma treatment on the surface properties of poly(ethylene terephthalate) (PET) in order to examine its possible application for metal…
The lamellar orientation in supported, thin films of poly(styrene- b -butadiene) (P(S- b -B)) depends on block copolymer molar mass. We have studied films from nine block copolymer samples with molar masses between 13.9 and 183 kg/mol using grazing-incidence small-angle X-ray scattering (GISAXS) and have found that in…
Knowledge of the electronic structure of amorphous and liquid silica at high pressures is essential to understanding their complex properties ranging from silica melt in magma to silica glass in optics, electronics, and material science. Here we present oxygen near $K$-edge spectra of ${\mathrm{SiO}}_{2}$ glass to $51…
Three isostructural disklike heptanuclear FeIII compounds of the general formula [FeIII7(mu3-O)3(L)3(mu-O2CCMe3)6(eta1-O2CCMe3)3(H2O)3], where L represents a di- or triethanolamine moiety, display a three-blade propeller topology, with the central Fe atom representing the axle or axis of the propeller. This motif corr…
The stability of weak polyelectrolytes end grafted to a planar surface has been studied with a molecular theory. The effective quality of the solvent is found to depend on the interplay between polymer grafting density, acid-base equilibrium, and salt concentration. Our results reveal that increasing salt concentratio…
Benzoyl peroxide initiated in situ functionalization of single-walled carbon nanotubes (SWNT) represents a simple means of generating reactive sites on the surface of carbon nanotubes by exploiting free radical interactions with the surrounding polymer matrix. The resulting composite, when processed into fiber form, d…
The electrical conductivity, thermoelectric power, and metal−insulator−semiconductor diode properties of polyaniline prepared in ionic liquid (PANI) have been investigated. The electrical conductivity of the polyaniline increases exponentially with increasing temperature. The electrical conductivity value at 28 °C is…
The physical properties of polyaniline (PAn) powder, doped by nucleophilic doping of dimethyl sulfate (DMS), were characterized, as well as its electrochemical behaviors, to investigate the possibility of a power source device adopting the PAn-DMS electrodes. It is shown that the nucleophilic addition of DMS into PAn…
A large mesoporous γ-alumina was fabricated through a thermal process without postaddition of molecular or organic solvents at ambient pressure in an open container by using the dual functions of 1-hexadecyl-3-methylimidazolium chloride (C 16 MimCl) as room-temperature ionic liquids (RTILs), i.e., templating and cosol…
Density functional calculations are used to calculate the structural and electronic properties of $\mathrm{Ba}\mathrm{Re}{\mathrm{H}}_{9}$ and to analyze the bonding in this compound. The high coordination in $\mathrm{Ba}\mathrm{Re}{\mathrm{H}}_{9}$ is due to bonding between Re $5d$ states and states of $d$-like symme…
The effect of external pressure on the magnetic properties and magnetocaloric effect of polycrystalline compounds DyCo 2 and Er(Co 1− x Si x ) 2 ( x = 0,0.025 and 0.05) has been studied. The ordering temperatures of both the parent and the Si-substituted compounds are found to decrease with pressure. In all the compou…
Based on molecular dynamics simulations of a lithium metasilicate glass we study the potential of bond valence sum calculations to identify sites and diffusion pathways of mobile Li ions in a glassy silicate network. We find that the bond valence method is not well suitable to locate the sites, but allows one to estim…
A model of coherent tunneling, which combines multiorbital tight-binding approximation with Landauer-B\"uttiker formalism, is developed and applied to all-semiconductor heterostructures containing (Ga,Mn)As ferromagnetic layers. A comparison of theoretical predictions and experimental results on spin-dependent Zener t…
The polyol method was employed for the first time to synthesize cuprous oxide nanowires using only a precursor of Cu(II) acetate monohydrate and diethylene glycol (DEG). With careful control of the reaction temperature (190 °C), the precursor concentration (0.01−0.1 mol/L), and the reaction time (6 h), we prepared Cu…