Materials Literature
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Zink macht einen Unterschied: Die neuen Komplexe [(3,5-Me2C5H3N)2Zn(ESiMe3)2] (1: E=Se, 2: E=Te, siehe Bild, Te rot, Zn blau, Si gelb, N grün) erwiesen sich als gute Reagentien für die Erzeugung von ternären MM′E-Materialien. Aus 2 wurde der ternäre ZnCdTe-Nanocluster [Zn2.6Cd7.4Te4(TePh)12(PnPr3)4] hergestellt. Seine…
Using density functional theory, we have theoretically studied sidewall functionalization of carbon nanotubes (CNT) with a nucleophilic organic carbene, dipyridyl imidazolidene (DPI). When compared to the dissociated system, formation of the adduct from defect-free (5,5) tube and the DPI is weakly exothermic. However,…
This investigation has been performed to test the feasibility of using K2YF5:Tb3+ crystals as thermoluminescence dosemeters (TLD). K2YF5 single crystals doped with 0.2, 10.0 and 50.0 at.% of trivalent optically active Tb3+ ions as well as K2TbF5 and undoped K2YF5 crystals have been synthesized under hydrothermal condi…
Micron-sized water droplets in a cryogenic flow tube were probed by IR spectroscopy. The analysis of the IR spectra suggests that there is a relative increase of about 30% in the fraction, f(L), of low density domains in water on cooling over the temperature range between 300 and 240 K. The results derived from the ex…
The Smoluchowski equation for irreversible aggregation in suspensions of equally charged particles is studied. Accumulation of charges during the aggregation process leads to a crossover from power-law to sublogarithmic cluster growth at a characteristic time and cluster size. For larger times the suspension is usuall…
Leuchtendes Beispiel: Die optischen Eigenschaften von lumineszierenden Nanokristallen (quantum dots, QDs) können meist nur genutzt werden, wenn ihre Oberfläche geeignet derivatisiert ist. Es wird eine einfache Methode vorgestellt, um einzelne QDs unter Erhaltung ihrer Lumineszenzeigenschaften gleichmäßig mit amorphem…
That zinc in feeling: The complexes [(3,5-Me2C5H3N)2Zn(ESiMe3)2] (E=Se, 1; E=Te, 2) are prepared and found to be good reagents for the generation of ternary MM′E materials. From 2 (see structure; Te red, Zn blue, Si yellow, N green), the ternary ZnCdTe nanocluster [Zn2.6Cd7.4Te4(TePh)12(PnPr3)4] (3) is prepared. The o…
Abstract Poly( O ‐anisidine) coating was successfully electrodeposited onto Al‐2024. Cyclic voltammetry and reflection absorption infrared spectroscopy (RAIR) analysis were carried out in order to fully understand the formation and structure of the resulting polymer coating. RAIR spectrum showed the characteristics pe…
We report a numerical study of saddles properties of the potential energy landscape for soft spheres with different softness, i.e., different power n of the interparticle repulsive potential. We find that saddle-based quantities rescale into master curves once energies and temperatures are scaled by mode-coupling temp…
Large scale molecular dynamics and grand canonical Monte Carlo simulation techniques are used to study the behavior of the interdiffusion of a solvent into an entangled polymer matrix as the state of the polymer changes from a melt to a glass. The weight gain by the polymer increases with time t as t(1/2) in agreement…
Platinum nanoparticles, nanorods, and nanonetworks were fabricated in mesoporous silica MCM-48. Investigations including transmission electron microscopy (TEM) with electron diffraction, powder X-ray diffraction (PXRD) with Rietveld analysis, and extended X-ray absorption fine structure analysis (EXAFS) suggest the cr…
We investigate the structure and elastic properties of the amorphous high-temperature ceramic $a$-${\mathrm{Si}}_{3}{\mathrm{B}}_{3}{\mathrm{N}}_{7}$. Several different structural models are generated and their properties such as the radial and angular distribution functions, the degree of local order, the density, th…
Acoustical measurements, electron spin resonance, and Raman spectroscopy have been employed to probe sulfur over the temperature range 80-180 degrees C, which includes the polymerization transition and the supercooled liquid state. Acoustical properties (sound velocity, absorption, and impedance) have been studied wit…
A series of mutants of chymotrypsin inhibitor 2 (CI2), at residues that interact with the inhibited enzyme subtilisin BPN', were studied to determine the relative importance of intermolecular contacts on either side of the scissile bond. Mutants were tested for inhibition of subtilisin, rates of hydrolysis by subtilis…
The linear and nonlinear optical properties of the 3-methyl-4-nitropyridine-1-oxyde (POM) crystal have been evaluated using semiempirical quantum chemistry techniques. The scheme includes (i) the evaluation of the polarizability and first hyperpolarizability of increasingly large one-dimensional, two-dimensional, and…
For insight into the structure and dynamics of phases emerging upon crossing the metastability/instability boundary we monitor with optical microscopy, in real time and in real space, the generation of a dense liquid phase in high-concentration solutions of the protein lysozyme after temperature quenches into thermody…
The temperature dependence of the thermal conductivity of porous, nanostructured alumina has been measured. It is shown that this dependence can be described with a single parameter, the value of which depends on the intergrain boundary structure and is independent of the grain size and porosity.
Using first principles calculations based on gradient corrected density functional theory we show that Mn atoms, which couple ferromagnetically in bulk Ga1-xMnxN, couple antiferromagnetically on its surface. This change in magnetic behavior is brought about by a contraction of the Mn-Mn and Mn-N bond lengths, which is…
Abstract This paper presents an innovative design of a tandem extrusion system for fine‐celled foaming of plastic/wood‐fiber composites using a physical blowing agent (PBA). The plastic/wood‐fiber composites utilize wood‐fibers (WF) as a reinforcing filler in the plastic matrix and are known to be advantageous over th…
The controlled nanocrystallization of as-milled glassy ${\mathrm{Pr}}_{40}{\mathrm{Fe}}_{30}{\mathrm{Co}}_{15}{\mathrm{Al}}_{10}{\mathrm{B}}_{5}$ leads to a Curie temperature of $625\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, a magnetic remanence ratio of 0.55, and a very high coercivity of $29\phantom{\rule{0.3em}{0ex}}\…