Materials Literature
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We examine whether single molecule sensitivity in surface-enhanced Raman scattering (SERS) can be explained in the framework of classical electromagnetic theory. The influence of colloid particle shape and size, composition (Ag or Au) and interparticle separation distance on the wavelength-dependent SERS enhancement f…
Inorganic Research Laboratory, Chemistry Department, Dr H. S. Gour University, Sagar-470 003, India <em>Manuscript eeceived 26 October 1999, revised 21 February, 2000, accepted 25 March 2000</em> Complexes of Co<sup>II</sup>, Ni<sup>II</sup> and Cu<sup>ll</sup> have been synthesized with the Schiff bases prepared by c…
Molecular-based magnet nickel−iron cyanide, K 0.8 Ni 1.1 [Fe(CN) 6 ]·4.5H 2 O, was prepared by coprecipitation. The powder X-ray diffraction indicates an fcc crystal structure with a unit cell constant of 10.4 Å. Its Curie temperature was determined to be 28 K from the Curie−Weiss law. The effects of heat treatment on…
Tris(9,10-phenanthrenedioxy)cyclotriphosphazene forms inclusion adducts with a wide range of organic small molecules. This novel host molecule crystallized with p -xylene to form a triclinic 1:1 inclusion adduct, space group P 1̄ (No. 2), having unit cell of dimensions a = 12.724(3) Å, b = 19.347(5) Å, c = 9.124(5) Å…
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…