Materials Literature
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Positively charged polydiallyldimethylammonium chloride, P, was found to bind strongly to the surface of anionic montmorrillonite, M, platelets in aqueous dispersions up to a saturation (estimated to correspond to the binding of five P to one 1.0 nm × 200 nm M platelet) beyond which reversible physisorption occurred.…
Very highly conductive Au films on glass substrates have been prepared by stepwise, layer-by-layer immobilization of 11-nm diameter colloidal Au particles and a short organic cross-linker. Particle coverage, optical spectra, nanometer-scale topography, and electrical resistance have been measured as a function of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDendrimers as Controlled Artificial Energy AntennaeArie Bar-Haim, Joseph Klafter, and Raoul KopelmanView Author Information School of Chemistry, Tel Aviv University Tel Aviv 69978, Israel Department of Chemistry, University of Michigan Ann Arbor, Michigan 48109-1055 Ci…
Polycrystalline samples of were oxidized in air in the 900 to 1400°C temperature range. The oxidation was parabolic with parabolic rate constants, k p , that increased from to as the temperature increased from 900 to 1400°C, respectively, which yielded an activation energy of 370 ± 20 kJ/mol. The scale that forms was…
The effect of oxygen on the potential of electrodes coated with a thin layer of various conducting polymers and immersed in aqueous neutral buffer solution has been studied. A theoretical equation describing the dependence of the potential on the concentration of oxygen has been derived and shown to be in conformity w…
Polyaniline thin films produced by the evaporative deposition of emeraldine on Cu(110) and on evaporated Au surfaces have been characterized using high-resolution electron energy loss spectroscopy (HREELS). Ultrathin films (less than 100 Å) doped with HCl exhibited plasma frequencies in the far-IR, suggesting a high d…
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To investigate the potential of gadolinium (Gd)-ethoxybenzyl (EOB)-diethylenetriamine-pentaacetic acid (DTPA) for evaluating liver function, chemically induced hepatitis animal models were studied. The rats in group 1 underwent intraperitoneal administration of 2.0 ml/kg and those in group 2 underwent intraperitoneal…
Measurements of the entropy change at the martensitic transition of two composition-related sets of Cu-Al-Mn shape-memory alloys are reported. It is found that most of the entropy change has a vibrational origin, and depends only on the particular close-packed structure of the low-temperature phase. Using data from th…
A novel water-soluble polyaniline has been synthesized by horseradish peroxidase catalyzed oxidative free-radical coupling of 2,5-diaminobenzenesulfonate. The polymerization reaction is rapid, and the average molecular weight of the resulting polymer is on the order of 18 000. Unlike the sulfonated polyanilines synthe…
The first example of spin crossover iron(II) complexes based on dihydrobis(1-pyrazolyl)borate are presented here. The complexes {Fe[H(2)B(Pz)(2)](2)(phen)} (phen = 1,10-phenanthroline), 1, and {Fe[H(2)B(Pz)(2)](2)(bipy)} (bipy = 2,2'-bipyridine), 2, have been synthesized and their structures determined by X-ray diffra…
An anharmonic correlated Einstein model is derived for local vibrational amplitudes in x-ray-absorption fine structure (XAFS) that takes into account all near neighbors of absorber and backscattering atoms. The model is based on quantum thermodynamic perturbation theory and includes anharmonic effects based on empiric…
Five surface-enhanced Raman scattering (SERS) substrates were quantitatively compared for ease of preparation, sensitivity, limit of detection (LOD), reproducibility, and stability. Specifically, vapor-deposited Ag films, electrochemically roughened Ag electrodes, nitric acid-etched Ag foil, Tollens-produced Ag films,…
RATIONALE AND OBJECTIVES: To evaluate the physical and pharmacological profiles of SH U555A, a suspension of magnetic iron oxide particles that is designed to enhance the visualization of liver tumors and metastases. MATERIAL AND METHODS: Chemical and physical methods were used to characterize the size and structure o…
This paper presents a review on Latosols (oxisols) genesis, classification and use in tropical Brazil.Chemical, physical and mineralogical aspects are throughly discussed, as well as their relationship withsoil use and management. Some problems of definition are considered for all types of Latosols recognizedin the Br…
Results of an investigation into the influence of hydrosol pH on the optical properties of gold colloidal particles capped with a novel aromatic bifunctional molecule, 4-carboxythiophenol (4-CTP), are presented. Changes in the optical properties of the carboxylic acid derivatized clusters have been interpreted as aris…
Compositional zoning in hundreds of almandine‐rich garnets in amphibolite by facies micaceous quartzites from the Picuris Range, north‐central New Mexico USA, indicates that although Mn, Mg and Fe achieve chemical equilibrium at hand‐sample scale during garnet growth, Ca does not. Instead, Ca concentrations at the sur…
Cancer chemotherapy is not always effective. Difficulties in drug delivery to the tumor, drug toxicity to normal tissues, and drug stability in the body contribute to this problem. Polymeric materials provide an alternate means for delivering chemotherapeutic agents. When anticancer drugs are encapsulated in polymers,…
The EXAFS Debye-Waller factor depends on the correlation of atomic motion and can yield original information on the vibrational dynamics of crystalline solids. In this paper an introductory treatment of thermal disorder in EXAFS, based on thc cumulant approach, is given. Thc general relation between mean-square relati…
We have studied transport properties (resistivity, Hall effect, thermopower, and thermal conductivity) of Bi 2 S 3 and two new ternary bismuth sulfides, KBi 6.33 S 10 and K 2 Bi 8 S 13, to explore their potential for thermoelectric applications. While both Bi 2 S 3 and K 2 Bi 8 S 13 display an essentially metallic con…