Materials Literature
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This work demonstrates a sustainability assessment of stabilisers for use in PVC pipes. The two key stabilisers selected compare calcium–zinc and so-called organically based stabiliser systems (OBS by Crompton). The methodology of the work is based on a robust set of sustainability principles known as The Natural Step…
Abstract A very efficient, simple synthesis of face‐to‐face porphyrin–corrole free‐bases bearing substituents at the meso positions of the corrole ring is reported. Starting from the (porphyrin–aldehyde)zinc species 1Zn , porphyrin–corrole free‐bases ( 3M , 3C ) are obtained in two steps, in fairly good yields (40–43…
Neste trabalho, foi analisado o efeito de um tratamento químico, ou seja, de acetilação de grupos, sobre a estrutura e a morfologia superficial de fibras de bucha (Luffa cylindrica) por meio de FTIR e microscopia eletrônica de varredura. Esse tratamento foi realizado tendo por objetivo aumentar a compatibilidade da bu…
In this study boron nitride‐containing composites (BNCC) with high strength, low Young's modulus and highly improved strain tolerance have been developed by reaction synthesis technology. The in situ formed BN particles with fine (nanosized) particle size were distributed homogeneously and isotropically in the matrixe…
Research Article| March 01, 2005 Growing Diamond Crystals by Chemical Vapor Deposition Russell J. Hemley; Russell J. Hemley Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, D.C. 20015, USA E-mail: r.hemley@gl.ciw.edu Search for other works by this author on: GSW Goo…
Composite materials are a class of materials used in many diverse applications. Very recently the attention has shifted to the development of green composites that are easily recycleable and in this case the use of biodegradable matrices and fibres appear to be highly attractive. In the present study a class of biodeg…
We have investigated the electronic structure of Au(tmdt) 2 (tmdt = trimethylenetetrathiafulvalenedithiolate), which is a single-component conductor showing a magnetic phase transition around 100 K, by ab initio plane-wave pseudopotential calculations. A single band crosses the Fermi level. This band and the next band…
Research Article| March 01, 2005 Meteoritic Nanodiamonds: Messengers from the Stars Gary R. Huss Gary R. Huss 1Hawai'i Institute of Geophysics and Planetology University of Hawai'i at Manoa, USA E-mail: ghuss@high.hawaii.edu Search for other works by this author on: GSW Google Scholar Elements (2005) 1 (2): 97–100. ht…
Abstract The binding of a series of phosphate anions to coordinatively unsaturated macrocyclic complexes of Yb, Tm, and Eu was studied by 1 H‐NMR, emission and circularly polarized luminescence (CPL) spectroscopy. Each ternary adduct was distinguished by its spectral profile. With O ‐phosphorylated amino acids and pep…
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Abstract Eu 3+ , Dy 3+ , and Yb 3+ complexes of the dota‐derived tetramide N , N′ , N″ , N′′′ ‐[1,4,7,10‐tetraazacyclododecane‐1,4,7,10‐tetrayltetrakis(1‐oxoethane‐2,1‐diyl)]tetrakis[glycine] (H 4 dotagl) are potential CEST contrast agents in MRI. In the [Ln(dotagl)] complexes, the Ln 3+ ion is in the cage formed by t…
The influence of rare earth (RE) additions on the microstructure and some properties of gold and gold alloys have been studied. RE additions can refine the grain size of gold alloys, but show a tendency to segregation, both dendritic segregation in cast alloys and grain boundary segregation in annealed alloys. For gol…
The present study explores the effects of exposure in a laboratory combustor on microstructural stability and property retention of an all‐oxide fiber‐reinforced ceramic composite. The material consists of a porous mullite–alumina matrix and Nextel 720 fibers in an eight‐harness satin weave. To assess the effects of m…
The reaction kinetics for the formation of CuInSe2 thin films from a stacked bilayer precursor consisting of InSe and CuSe was studied by means of in situ high-temperature x-ray diffraction. In particular, the isothermal phase evolution of the glass/InSe/CuSe precursor was observed at different temperatures. The pathw…
Experimental study of the hydrogen coverage of a nanoporous silicon-specific surface reveals a fractal nature of the surface of silicon nanocrystallites constituting the porous layer. A fractal model describing the nanocrystallite morphology is elaborated. The evolution of the nanocrystallites' fractal dimension $(2.1…
Summary Immersing commercial spent nuclear fuel (CSNF) in deionized water produced two corrosion products after a 2-year contact period. Suspensions of aggregates were observed to form at the air–water interface for each of five samples. These suspended aggregates were characterized by X-ray diffraction (XRD) to be me…
A new and simplified method of fabricating anodic aluminum oxide has been developed. This new method uses anodization but follows a route different from the commonly known 1- or 2-step anodization. General-purity (99.7%) commercial aluminum is used instead of the high-purity aluminum required in conventional anodizati…
Effects of Y 2 O 3 on the temperature stability of acceptor-doped BaTiO 3 dielectrics were studied. The sample doped with 1 mol% Y 2 O 3 exhibited the highest dielectric constant. A substantial reduction in grain size was observed in the specimen with 1 mol% Y 2 O 3 (∼0.6 µm), compared with the undoped specimen (∼1.5…
The synthesis of two galactose-terminated alkanethiols with the structural formula X-OC2H5NHCO(CH2)15SH (X = 2,3,4,6-tetra-O-methyl-beta-D-Gal or beta-D-Gal) is described. Single-component and mixed self-assembled monolayers (SAMs) of the methylated and nonmethylated compounds were prepared on gold and subsequently ch…
Abstract Polypyrrole films prepared from aromatic ester solutions of tetrabutylammonium tetrafluoroborate (TBABF4), tetrabutylammonium hexafluorophosphate (TBAPF6), tetrabutylammonium trifluoromethanesulfonate (TBACF3SO3), and tetrabutylammonium perchlorate (TBAClO4) exhibited large electrochemical strain (11.2–14.0%)…