Materials Literature
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We report the epitaxial growth of CryGe1-y and CryMnxGe1-x-y(001) thin films on GaAs(001), describe the structural and transport properties, and compare the measured magnetic properties with those predicted by theory. The samples are strongly p-type, and hole densities increase with Cr concentration. The CryGe1-y syst…
We study the behavior of two particles moving in a bistable potential, colliding inelastically with each other and driven by a stochastic heat bath. The system has the tendency to clusterize, placing the particles in the same well at low drivings, and to fill all of the available space at high temperatures. We show th…
Chain-like macromolecules (polymers) show characteristic adsorption properties due to their flexibility and internal degrees of freedom, when attracted to surfaces and interfaces. In this review we discuss concepts and features that are relevant to the adsorption of neutral and charged polymers at equilibrium, includi…
Polypyrrole (PPy) nanotubes have been fabricated by reverse microemulsion polymerization in an apolar solvent, and factors affecting the formation of PPy nanotubes have also been investigated.
Indiscriminate adsorption of nanoparticles (NPs) significantly complicates the preparation of mesoscale NP patterns considered as enabling technology for many devices and processes. Instead of selected chemical functionalization of the substrate surface prior to the assembly of nanocolloids, the required optical prope…
Abstract Nanocomposites based on biodegradable polycaprolactone (PCL) and organically modified layered silicates (organoclay) were prepared by melt mixing. Their structures and properties were characterized by wide‐angle X‐ray diffraction, thermal analysis, and rheological measurements. The exfoliation of the organocl…
Dye molecules (anthracene derivatives) are observed to strongly adsorb to single-walled carbon nanotubes (SWNTs). The adsorption coverage of anthracene molecules on SWNTs varied with the aromatic ring substituents. The observed red shifts of emission peaks of the absorptive adduct appear to depend on the energy level…
In this review, the delicate interplay between stereochemical control, monitoring at the subnanometer level, and an understanding of crystal nucleation is probed. Control of crystal nucleation may be achieved employing tailor-made auxiliaries, which are either nucleation inhibitors or promoters. The process may be mon…
Molecular modeling has been performed on three cellulosic systems: the two native crystalline phases (Iα and Iβ) and an amorphous phase, constituted by four independent microstructures. The goal of the study is to describe different organizations of the material and to emphasize how crystalline and amorphous cellulose…
Abstract From large‐scale production, two monocrystalline silicon solar cells of different quality, i.e. I SC = 3.0 A (good cell) and I SC = 1.6 A (bad cell), have been studied by XPS combined with 4 keV Ar + depth profiling. Depth profiling was carried out through the anti‐reflection coating (TiO 2 ), the passivation…
Abstract This paper presents a study of Sb 2 O 3 subjected to oxygen plasma and to ion beam bombardment (Ar + and O 2 + ions of 4 keV) by x‐ray photoelectron and reflected electron energy‐loss spectroscopies. Changes in stoichiometry (i.e O/Sb ratio) and oxidation state of Sb have been detected and correlated with the…
Abstract Polymeric alloys of bisphenol A polycarbonate and a polyester‐type polyurethane were prepared over a complete composition range through melt mixing. The blends were characterized with optical and scanning electron microscopy, tensile testing, dynamic mechanical analysis, thermal analysis (differential scannin…
Abstract Plasticized poly(vinyl chloride) (PVC) used for biomedical disposable devices was studied in the non‐sterilized state after different exposure times to soft x‐ray irradiation in a commercial photoelectron spectrometer (Al Kα, 15 kV/300 W; Mg Kα, 12 kV/240 W) by XPS surface analysis. The detailed spectra of C…
The polycrystalline single-phase sample of La 4 Si 2 O 7 N 2 was prepared at 1773 and 1873 K by the gas-pressured sintering method. The structure refinement was carried out by the Rietveld method using time-of-flight neutron powder diffraction data measured at 297 K. La 4 Si 2 O 7 N 2 is isostructural with the Y 4 Al…
The reaction of phosphanyl-terminated carbosilane dendrimers containing only one phosphorus ligand per arm with [MCl(cod)]2 (M = Rh, Ir; cod = cycloocta-1,5-diene) resulted in the grafting of MCl(cod) moieties on the surface of the dendrimer. However, dendrimers displaying two phosphorus ligands per arm gave very unst…
Abstract For Abstract see ChemInform Abstract in Full Text.
Abstract For Abstract see ChemInform Abstract in Full Text.
A substrate-independent method is described for the synthesis of polymer brushes on solid surfaces. This entails pulsed plasma deposition of maleic anhydride to generate a free radical initiator containing thin film followed by styrene polymerization. Polystyrene layers of up to 150 nm thickness can be grown from thes…
It is shown that, during electron irradiation of a thin carbon film in the presence of gold nanoparticles, fullerene onion structures are produced at a much higher rate than in the case in which no nanoparticles are present. We conclude that steps on the gold nanoparticle act as catalytic sites to promote the rearrang…
Abstract The velocity of vulcameter torque change during the vulcanization of natural rubber consists of two increasing and decreasing stages. The vulcanization process in the stage of velocity increasing is not a simple reaction, and can be expressed in an equation of ln( M H − M t ) = ln A − K 1 ( t − t 0 ) α , whic…