Materials Literature
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In recent work, we found that the stability of the negative corona charge in radio frequency plasma treated polytetrafluoroethylene (PTFE) films (18 µm thickness) strongly depends on the plasma sources, the exposure time and the condition of the film in the plasma, i.e. the film orientation on the holder and whether t…
Abstract Hybrid materials were synthesized from epoxidized (68, 43, or 14%) styrene–butadiene rubber (SBR) and the hydrolysis product of tetraethoxysilane (TEOS) in situ under ultrasonic irradiation. The products were characterized with thermal analysis (differential scanning calorimetry and thermogravimetric analysis…
Micro/nanomechanical characterization of a decagonal single-grain quasicrystal, Al 74.7 Co 16.9 Ni 8.4 , has been carried out. Hardness and elastic modulus were measured by nanoindentation using a nanoindenter. Fracture toughness was measured by microindentation using a microindenter. It was found that the Al 74.7 Co…
Abstract Sweet potato pulp (SSP) obtained as a by‐product from starch extraction was blended with polycaprolactone (PCL) to prepare a biodegradable plastic material. In the blends, PCL was used as a reinforcing agent. The SPP/PCL blends were prepared by compression‐molding under high temperature and pressure, at diffe…
We report a study of residual stress in PbTiO 3 (PT) thin films prepared on Si substrates by a polymeric chemical method. The E(1TO) frequency was used to evaluate the residual stress through an empirical equation available for bulk PT. We find that the residual stress in PT films increases as the film thickness decre…
Gießformen für Cluster: Die nanoporösen Domänen eines gelartigen mikroporösen funktionalen Harzes werden als Template bei der Herstellung von Pd0-Nanoclustern verwendet, deren Größe durch die weiteste Masche bestimmt wird (siehe Bild). Die Nanoporosität des Harzes im geschwollenen Zustand wurde durch Ausschlusschromat…
Interfacial polycondensations of bisphenol A with triphosgene were conducted in the CH 2 Cl 2 /aqueous NaOH system. Four different catalysts were compared: triethylamine, triethylbenzylammonium chloride (TEBA-Cl), tetrabutylammonium hydrogen sulfate, and tetraphenylphosphonium chloride. Triethylamine yielded mixtures…
The lattice dynamics of zinc-blende (ZB) CuBr and CuI is studied as a function of pressure using density functional linear-response theory. A pressure-induced soft transverse acoustic (TA) phonon mode is identified for both compounds. Each compound shows a different pressure-induced phonon softening behavior. A TA pho…
The morphology of clusters formed by selective aggregation of binary colloids is studied in a two-dimensional Monte Carlo simulation for a large range of number fractions (200:1, 100:1, 10:1, 2:1). We find remarkable similarity in morphology to those observed in experiments, from the formation of closed "micelles" to…
Abstract First hyperpolarizabilities (β) of triazine derivatives were studied by the ab initio method (HF/6–31G). The β values of these molecules increase with a stronger donor and as the conjugation length increases, probably because the electronic charge becomes more delocalized and the HOMO–LUMO energy gap (Δ E ) a…
The processing–microstructure-property relations have been studied in order to understand the role of the addition of CeO2 (up to 0.9 mole%) in the ZnO–Bi2O3 based varistor recipe. The microstructural investigation suggests that CeO2 is segregated at the corners of the ZnO grains in addition to the existence of the Zn…
Praseodymium-doped ZrO 2 photoluminescent (PL) powders have been prepared by a co-precipitation process. Different doping concentrations in the start mixture and annealing temperatures for the precipitated were studied. It is observed that the crystalline structure and the crystallinity of the powders depend on the an…
Abstract Kovalent über organische Einheiten mit delokalisiertem π‐Elektronensystem verbundene Polyoxometallat(POM)‐Hybridmaterialien haben zunehmendes Interesse geweckt. Diese Hybride wurden traditionell durch das nicht kontrollierbare Verknüpfen von Clustern synthetisiert, das Ergebnis war jedoch nicht vorhersagbar.…
Bimetallic catalysts such as Fe/Ru and Fe/Pt in the size range of 0.5−3 nm are currently being considered for the efficient growth of single-walled carbon nanotubes (SWNTs) on flat surfaces. It has been shown possible, by using chemical reduction under microwave irradiation and poly( N -vinyl-2-pyrrolidone) (PVP) as a…
Layer-by-layer adsorption of polygenic polyelectrolytes is a promising method of treatment in which multilayers are formed on the inner arterial wall (see scheme). An advantage of this technique, which has already proved successful in animal models, is that it is very simple to apply, in contrast to in situ polymeriza…
Density functional computations (PBE and B3LYP) in conjunction with 3-21G and 6-31G basis sets are used to determine the energy of fluorine atom and CH(2) addition to the sidewall of (5,5) C(30+10)(n)()H(20) (n = 0, 1, 2.18) carbon nanotube slabs. A pronounced oscillation of the addition energy is found for fluorine a…
Abstract Ternary blends of isotactic polypropylene (PP), ethylene–octene copolymer (mPE), and high‐density polyethylene (HDPE) were prepared by melt mixing in a twin‐screw extruder with two different sequences of mixing: the simultaneous mixing of the three components (method I) and the premixing of mPE and HDPE follo…
Abstract Methyl methacrylate and ethylacrylate (MMA‐ co ‐EA) and methyl methacrylate and butylacrylate (MMA‐ co ‐BA) copolymeric processing aids were introduced into poly(vinyl chloride) (PVC)/33.3 wt % wood–sawdust composites containing 0.6 and 2.4 phr of calcium stearate lubricant. The properties of the composites w…
Overlayer thin films of vinylbipyridine (vbpy)-containing Ru and Zn complexes have been formed on top of ruthenium dye complexes adsorbed to TiO(2) by reductive electropolymerization. The goal was to create an efficient, water-stable photoelectrode or electrodes. An adsorbed-[Ru(vbpy)(2)(dcb)](PF(6))(2)/poly-[Ru(vbpy)…
The objective of this investigation is to understand the inception of ice surface corona streamers. A validated onset criterion that is useful for practical electrode geometries is presented. High-speed streak photography techniques were used to observe the streamers propagating over an ice surface. The effects of sev…