Materials Literature
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The local structures of electrochemically deposited Cu on p-GaAs(100) of various coverages in 0.1 M H 2 SO 4 solution containing 0.1 mM CuSO 4 have been investigated by in situ surface-sensitive X-ray absorption fine structure (XAFS). The Cu K-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption…
ADVERTISEMENT RETURN TO ISSUEPREVResearch ArticleNEXTPreparation of Platinum Nanoparticles in Ethyl Acetate in the Presence of Poly(amidoamine) dendrimers with a Methyl Ester Terminal GroupKunio Esumi, Ryuhei Nakamura, Akihiro Suzuki, and Kanjiro TorigoeView Author Information Department of Applied Chemistry and Insti…
The surface properties of a polydisperse poly(vinycaprolactam) (48 kDa) have been studied at the air/water and hexane/water interfaces. Adsorption of the polymer at both interfaces shows substantial time-dependent surface tension lowering at remarkably low concentrations in the aqueous phase. This adsorption is increa…
A thin film of copper(I) oxide (thickness ∼9 Å), grown on a Cu(111) crystal, was used as a model photocatalyst for decomposition of D 2 O using ultraviolet light ( h ν = 1.55−6.21 eV). No evidence for water photosplitting was observed. The experimental uncertainties establish an upper limit of 2 × 10 -21 cm 2 for the…
The critical points of condensation in Coulomb systems are described here by a modified van der Waals equation of state taking into account a many-particle exchange interaction between virtual atoms with overlapping classically accessible spheres of valence electrons. A characteristic feature of the Coulomb critical p…
The deposition of a dye-doped mesostructured silica/block copolymer thin film on a mesoporous thin film, itself deposited on an optical fiber, represents a new way to laser materials. The microring laser implemented exhibits a low threshold (∼1.5 kW cm-2) and can be operated under ambient conditions for several tens o…
Solid solutions Ce 1 - x RE x O 2 - δ (RE = Eu, Tb) were prepared by a high-temperature and -pressure method. The products were characterized by X-ray diffraction (XRD), TG, electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and Mössbauer spectroscopy. XRD data analysis showed that all soli…
Self-complexation of triblock copolymers based on undeca- and heptadecathiophene cores attached to generation three Fréchet-type poly(benzyl ether) dendrons in solution at low temperature leads to the formation of relatively small but well-defined supramolecular assemblies. The formation of these aggregates is associa…
Metalladendrimers of generation 3 with either 24 terminal palladium or ruthenium diphosphine complexes or one ruthenium diphosphine complex located at the core have been found to be efficient, recoverable catalysts in three general organic reactions: Stille couplings, Knoevenagel condensations, and Michael additions.
Ultrathin, passivating films are attractive for protecting metal surfaces without completely masking substrate properties. Alternating polyelectrolyte deposition of layered poly(acrylic acid)/poly(allylamine hydrochloride) (PAA/PAH) films on Al produces ultrathin coatings that protect Al from Cl - -induced corrosion.…
We report the uniform planar anchoring of thermotropic liquid crystals on films of bovine serum albumin (BSA) covalently immobilized on the surface of glass microscope slides and mechanically rubbed using a cloth. The azimuthal orientations of the liquid crystals were measured to be parallel to the direction of rubbin…
The electrical properties of ferroelectric substances are investigated and related to the Curie-Weiss law. A cryogenic experiment suitable for students measures the electrical susceptibility of strontium titanate in the 90-300 K temperature range. By measuring the electrical susceptibility of a modified barium titanat…
A new class of low band gap thiophene polymers prepared from ( E )-α-cyanoethylene thiophene derivatives were electrochemically and physically evaluated as active electrode material for electrochemical supercapacitors. The corresponding polymers were prepared by electrochemical polymerization of these monomers from a…
With the rapid advances in the field of biotechnology during the last decade, many peptides and proteins have been produced and evaluated for therapy of various diseases, including cancer. However, rapid clearance and the possibility of immunogenicity after the in vivo administration of these biotechnology-driven prod…
This chapter gives a description of semiconductor surfaces, and the models used to explain them. Section 7.1 outlines ideas of bonding in elemental semiconductors, and these are used to discuss case studies of specific semiconductor surface reconstructions in section 7.2, building on the survey given in section 1.4. I…
For the first time giant free-standing monomolecular films of a functionalized poly(2-methyloxazoline)- block -poly(dimethylsiloxane)- block -poly(2-methyloxazoline), PMOXA−PDMS−PMOXA, triblock copolymer were prepared. Stable films with areas up to about 1 mm 2 and thickness of 10 nm were achieved. This triblock copol…
The relative configurational entropy per cell as a function of length scale is a sensitive detector of spatial self-similarity. For Sierpinski carpets the equally separated peaks of the above function appear at the length scales that depend on the kind of the carpet. These peaks point to the presence of self-similarit…
CdTe nanocrystals capped with 1-mercapto-2,3-propandiol, CdSe nanocrystals capped with sodium citrate, and core−shell CdSe/CdS nanocrystals capped with sodium citrate were synthesized in aqueous solutions, and their surface was modified by 3-mercaptopropyltrimethoxysilane (MPS) in water−ethanol mixtures. By addition o…
This book covers the experimental and theoretical understanding of surface and thin film processes. It presents a unique description of surface processes in adsorption and crystal growth, including bonding in metals and semiconductors. Emphasis is placed on the strong link between science and technology in the descrip…
Este trabajo está dedicado al proceso de aleación mecánica como método de obtención de polvos. En él se repasan los aspectos más importantes implicados en el proceso, los fundamentos, así como su aplicación particular a la obtención de polvos metálicos.