Materials Literature
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How fast does energy transfer along a conjugated polymer chain, and how fast between chains? A semiconducting polymer/mesoporous silica composite, which provides just enough space for one polymer chain per pore (see Figure), provides the answer through investigations of the polymer's luminescence anisotropy, with rema…
Two distinct channel systems are present in a polymer–inorganic nanocomposite, the structure of which is based on a bicontinuous plumber's nightmare (a regular array of completely interconnected tubes; see picture). Calcination at high temperatures leads to a metal oxide containing mesoporous silica-type material with…
We survey recent studies and present new data on the growth, interactions, structure and chemistry of gold deposited on TiO2(110) surfaces. The noble metal Au on TiO2(110) is a model system for weak interaction of a metal with an oxide substrate; it is also of interest because Au on TiO2 has unusually high activity as…
We study director structures of electrically-controlled cholesteric diffraction gratings (CDG's). The cholesteric liquid crystal (LC) is confined between two transparent non-patterned electrodes with either planar or homeotropic anchoring. In cells with planar alignment, the applied electric field causes reorientation…
A new plasma/catalyst continuously regenerative hybrid system (PCRHS) is introduced to reduce diesel particulate matter (DPM), NOx, CO, etc., contained in diesel exhaust gas. The catalyst temperature, plasma energy density, and exhaust gas characteristics were investigated with a passenger diesel car (2500cc) at the d…
To design nanocrystalline nanosystems, a theory for nanocrystals is needed which can be applied to nanocrystals with atomic-scale variations in composition, structure and shape. We present an empirical tight-binding theory for nanocrystal heteronanostructures. Electronic structure and optical absorption spectra are ob…
Several micro-techniques (confocal laser-Raman microprobe, optical absorption micro-spectroscopy, high-resolution transmission electron microscopy, electron microprobe analysis) were employed in the detailed characterization of radiohaloes in biotites from two Variscan rocks from Germany. The studied biotites are inte…
This paper is concerned with a phase-field model with temperature dependent constraint for the order parameter. In the kinetic equation of the order parameter, we take account of diffusion as well as the undercooled/superheated state which is modelled by means of a hysteresis input–output relation; the input is the te…
The influence of oxygen content on the magnetization and electrical resistivity of Ln0.5A0.5MnO3 (Ln=La, Pr, Nd; A=Ca, Ba) manganites with the perovskite structure is investigated. It is shown that the La0.5Ca0.5MnO3−γ compound undergoes a sequence of transitions from an antiferromagnetic (γ=0) to a spin-glass (γ=0.17…
A thermal gravimetric method was employed to explore the course of dehydration of Na2CO3 · 10 H2O, and Na3CO3 · H2O particles. Experimental data were amassed both in the temperature-increasing and constant temperature mode. Very small sample masses were used in an effort to eliminate an effect of heat and mass transfe…
Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy was used to study the pyrolysis of polyimide (Kapton®). The samples were prepared in a KBr matrix, which did not show pronounced interferences, such as increased emissivity, during the measurements. The pyrolysis of Kapton® reveals pronounced differen…
Abstract The contributions of the so‐called “interface effects” on the overall viscoelastic behavior of SBR reinforced by precipitated silica modified by model sizing agents are evaluated by using micromechanical models in a reverse mode. According to the nature of the coupling agent, two kinds of “interface effects”…
A layer of Y 2 O 3 –Al 2 O 3 , used as a sintering aid, was coated onto the surface of Si 3 N 4 particles by the precipitation of inorganic salts from a water‐based solution containing Al(NO 3 ) 3 , Y(NO 3 ) 3 , and urea. The electrokinetic and colloidal characteristics of the Si 3 N 4 powder were changed significantl…
Recently, the correlation between the 1100 cm −1 Raman band and the sp 3 fraction in amorphous or nanocrystalline carbon films was unambiguously demonstrated. From theoretical and experimental results on carbon-assembled materials, an explanation about the 1100 cm −1 Raman band origin is given. The difficulty to detec…
Abstract A rheooptical method proposed rapidly determines the aspect ratio and polydispersity of small axisymmetric, nonspherical particles. The time evolution of the average orientation angle of optically isotropic, nonabsorbing particles upon inception of a shear flow was monitored by a polarization modulation metho…
Diffuse scattering in titanite has been measured at three temperatures, 0.951 T c , 1.053 T c and 1.177 T c , using synchrotron radiation. T c = 487 K is the temperature of the antiferroelectric paraelectric phase transition. Charge-coupled device (CCD) intensity measurements were centred about the \bar{4}01 reciproca…
This study evaluates the effects of silicone softeners on the dimensional properties of wool fabric. Samples are treated with a simple pad-dry-cure process in an aqueous bath with aminofunctional and epoxyfunctional silicone softeners. The results indicate that dimensional stability and performance properties improve.…
AND APPLICATIONS.The self-assembly technique is a powerful tool to fabricate ultrathin films from organic compounds aiming at technological applications in molecular electronics.This relatively new approach allows molecularly flat films to be obtained on a simple and cheap fashion from various types of material, inclu…
Unsaturated polyesters, based on ω-unsaturated fatty acid esters from oleochemical resources and petrochemical diols, were synthesized via two different synthetic pathways. 9-decenoic and 10-undecenoic acid methyl ester I a, b were transesterified with petrochemical diols to produce the α,ω-alkylene di(un)decenoates I…
The effect of interfacial reactions between Al and SiC on the thermal conductivity of SiC‐particle‐dispersed Al‐matrix composites was investigated by X‐ray diffraction and transmission electron microscopy (TEM), and the thermal barrier conductance ( h c ) of the interface in the Al–SiC composites was quantified using…