Materials Literature
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The integration of multiple nano- particles (NPs) with different physical properties into a multifunctional hybrid NP is a challenge. Here, a new wet chemical synthesis is used to generate hybrid NPs by the heterogeneous growth of one NP onto another equivalent-sized NP (see Figure). The hybrid NPs consist of Ag-NPs a…
Ionizing radiation-induced degradation of poly(vinyl alcohol) (PVA) in aqueous solutions was investigated. Experimental results demonstrate that PVA degradation was initiated by attack of • OH and H •, followed by random chain scission and formation of ketones, enols, aldehydes, acids, etc. Complete mineralization of…
We study the dependence of the dynamics on the size of particle clusters that grow by stepwise aggregation in a reactive epoxy-amine mixture. The data reveal the cluster property involved in the glasslike arrest and its quantitative link with the structural relaxation time. We find that the number-average cluster size…
Conductivity behavior of the Bi12TiO20 single crystal was investigated by the electric modulus spectroscopy, which was carried out in the frequency range from 5 Hz to 13 MHz and at temperatures higher than 400 °C. The resistance curve exhibits a set of properties correlated to a negative temperature coefficient thermi…
The isolation, structural characterization, and electronic properties of two six-coordinated chloromanganese (III) complexes, [Mn(terpy)(Cl)3] (1) and [Mn(Phterpy)(Cl)3] (2), are reported (terpy = 2,2':6'2"-terpyridine, Phterpy = 4'-phenyl-2,2':6',2"-terpyridine). These complexes complement a series of mononuclear azi…
Vergoldete Nanofasern: Nanofasern aus Peptid-Amphiphilen mit Wasserstoffbrücken-Bindungsstellen an der Oberfläche dienten als Template für den Aufbau eindimensionaler Anordnungen aus lipophilen anorganischen Nanopartikeln in apolaren organischen Lösungsmitteln (siehe Bild).
A natural linker of approximately 20 residues connects the acyl carrier protein with the carboxy-terminal thioesterase domain of the animal fatty acid synthase. This study examines the effects of changes in the length and amino acid composition of this linker on catalytic activity, product composition, and segmental m…
Band discontinuities and band bending at the epitaxial SrTiO3∕GaAs(001) interface were investigated using x-ray and ultraviolet photoelectron spectroscopy. Results showed that the epitaxial SrTiO3∕GaAs(001) formed a type II heterojunction with conduction and valence band offsets being 0.6 and 2.5 eV, respectively, for…
A trisilanol polyhedral oligomeric silsesquioxane (POSS), trisilanolcyclohexyl-POSS (TCyP), has recently been reported to undergo a series of phase transitions from traditional Langmuir monolayers to unique rodlike hydrophobic aggregates in multilayer films that are different from "collapsed" morphologies seen in othe…
A mechanochemical intercalation approach which applies a simple mechanical milling to induce intercalation reaction was applied to introduce controlled amount of tetraethoxylsilane (TEOS) into surfactant-preexpanded graphite oxide, and the relationships between the intercalation structure, the porosities of the calcin…
Using a full potential linearized muffin-tin approach and the spin polarized density functional method, we studied the magnetism and the electronic structure for transition metal pnictides in the zinc blende (ZB) and the wurtzite (WZ) structures under volume expansion and compression. It was found that for many compou…
Closing individual, thin, multiwalled carbon nanotubes is performed in situ in a transmission electron microscope (see Figure). The closure of the initially open end of the nanotube results from the presence of a strong electric field and the accompanied electron emission. The closed-cap nanotubes exhibit high current…
The infrared low-temperature Ar-matrix spectra of 5-halouracils and unsubstituted uracil were measured and interpreted in terms of the spectra calculated at the DFT/B3PW91/6-311G level followed by a potential energy distribution (PED) analysis. For the PED analysis, the sets of halouracil mode definitions were constru…
Epitaxial layers of Ga 1− x Mn x N with concentrations of up to x = 0.015 have been grown on c-sapphire substrates by metalorganic chemical vapour deposition. No ferromagnetic second phases were detected via high-resolution x-ray diffraction. Crystalline quality and surface structure were measured by x-ray diffraction…
The crystal and the magnetic structures as well as magnetostriction of the Laves-phase compound $\mathrm{Nd}{\mathrm{Co}}_{2}$ are investigated by means of temperature-dependent high-resolution neutron-powder diffraction. The compound crystallizes in the cubic Laves phase $C15$ structure at high temperature, undergoes…
Cross sections at low energies for vibrationally elastic and inelastic scattering, as well as electron attachment to $\mathrm{S}{\mathrm{F}}_{6}$, have been calculated using a multichannel effective range theory (ERT) with complex boundary conditions. The most active vibrational modes, the totally symmetric mode ${\en…
We investigate the early stages of mass convection in a colloidal suspension at high solutal Rayleigh number ${\stackrel{^}{\mathrm{R}\mathrm{a}}}_{s}$. From the time evolution of shadowgraph images and by assuming a diffusive growth of the boundary layers we obtain an indirect measurement of the concentration boundar…
We report the first synthesis of titanium nitride (TiN) nanoparticles inside the nanoscale channels of mesoporous silica SBA-15. The TiN precursor, Ti(NMe(2))(4) in toluene, was incorporated into the methyl group-modified channels of the SBA-15 powder. The functionalization of pore surfaces with methyl groups generate…
Development of simple and reliable protocols for the synthesis of organically soluble catalytically active metal nanoparticles is an important aspect of research in nanomaterials. We demonstrate herein the formation of Pd nanoparticles by reduction of aqueous Pd(NO(3))(2) by photoexcited Keggin ions (phosphotungstate…
The complexation of Dawson-type polyoxometalates of [α-P 2 W 18 O 62 ] 6 -, [α 2 -P 2 W 17 V 1 O 62 ] 7 -, and [α-P 2 W 15 V 3 O 62 ] 9 - with the macrocation ([Cr 3 O(OOCH) 6 (H 2 O) 3 ] + ) forms ionic crystals of (NH 4 ) 4 [Cr 3 O(OOCH) 6 (H 2 O) 3 ] 2 [α-P 2 W 18 O 62 ]·15H 2 O ( 1a ), (NH 4 ) 5 [Cr 3 O(OOCH) 6 (H…