Materials Literature
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Abstract The crystal structures of the mendipite series Pb 3 O 2 Cl 2 —Pb 3 O 2 Br 2 have been solved by direct methods. The structures are based upon [O 2 Pb 3 ] 2+ double chains of edge-sharing OPb 4 tetrahedra. There are three symmetrically independent Pb 2+ cations. The number of nonequivalent halogen sites is two…
Abstract. Ultra thin platinum films were grown by dc magnetron sputtering on thermally oxidized Si (100) substrates. The electrical resistance of the films was monitored in-situ during growth. The coalescence thickness was determined for various growth temperatures and found to increase from 1.3 nm for films grown at…
Quantification of quantum dots (QDs) is essential to the quality control of QD synthesis, development of QD-based LEDs and lasers, functionalizing of QDs with biomolecules, and engineering of QDs for biological applications. However, simple and accurate quantification of QD concentration in a variety of buffer solutio…
Abstract The JXA-8100 microanalyzer software provides precise electron-probe microanalysis of rock-forming minerals, with a relative deviation within 1.0–1.5%, if the matrix effect in the samples is predominantly determined by only one physical factor: either atomic number or absorption. If the matrix effect is of bin…
Catalysts for low temperature CO oxidation were prepared by decorating hydroxyapatite (HAp) ceramic foam scaffolds with highly dispersed gold nanocrystals using a deposition-precipitation (DP) process. Catalytic activity, microstructure and crystallinity were studied as a function of reagent pH (4–12) and aging time (…
Dye-sensitized solar cells (DSSCs) represent an exciting application of nanotechnology and offer an appealing alternative to conventional solar cells based on photovoltaic devices, with significantly reduced production and material costs. However, further improvements are required to enhance the commercial viability o…
T.M. Paull, P.B. Hamilton, K. Gajewski and M. LeBlanc. 2008. Numerical analysis of small Arctic diatoms (Bacillariophyceae) representing the Staurosira and Staurosirella species complexes. Phycologia 47: 213–224. DOI:10.2216/07-17.1Small benthic fragilarioid diatoms (Bacillariophyceae) are dominant taxa in circumpolar…
Here we report the two-step synthesis of high aspect-ratio gold nanorods via combining low pH growth and higher cetyltrimethylammonium bromide concentration. The approach is motivated by the "slow growth principle", which has been demonstrated recently as a effective protocol to prepare high aspect-ratio one-dimension…
In a recent series of papers, a general methodology has been developed for the synthesis of polymer@silica submicrometer particles, which is based on the entrapment of a hydrophobic organic polymer in a polycondensating tetraethoxysilane (TEOS) oil-in-water (O/W) emulsion. As this system could not handle hydrophilic p…
We investigate the origin of the surface conductivity of H-terminated diamond films immersed in aqueous electrolyte. We demonstrate that in contrast to the in air situation, charge transfer across the diamond interface does not govern the surface conductivity in aqueous electrolyte when a gate electrode controls the d…
Amidos de mandioca podem ser matérias-primas para a obtenção de filmes biodegradáveis, sendo que para a formação destes é necessária a elaboração de suspensões filmogênicas. Alguns processos de modificação do amido podem torná-lo miscível em água fria, e outros processos de modificação podem alterar as propriedades do…
The frequency response (10−1–10−7 Hz) of the ionic conductivity σ of R 1 − y M y F3 − y single crystals (R is a rare-earth element, and M stands for an alkaline-earth element and Cd) with a tysonite structure is studied over a wide temperature range (114–410 K), which includes (for the first time for these phases) the…
The affinity of microbial cells for hydrophobic interfaces is important because it directly affects the efficiency of various bioprocesses, including green biotechnologies. The toluene-degrading bacterium Acinetobacter sp. strain Tol 5 has filamentous appendages and a hydrophobic cell surface, shows high adhesiveness…
Raman spectroscopy is known to be an effective tool for characterization of graphene and graphene multilayers on the standard Si/SiO 2 (300 nm) substrates, which allows one to determine non-destructively the number of the graphene layers and assess their quality. The Raman phonon peaks undergo modification when graphe…
Highly microporous hybrid materials with embedded Ni or Pt nanoparticles were prepared by pyrolytic conversion of polysiloxane – metal salt precursors and characterised in terms of surface area, sorption behaviour of water and n-heptane, size and accessibility of metallic nanoparticles. Upon varying the amount of poly…
Duplex stainless steels present simultaneously very diversified technical challenges and very attractive in service properties along with excellent cost/properties ratios particularly in very critical markets: oil and gas, chemical industry, pulp and paper industry, water systems, desalination plants, pollution contro…
A new foaming process has been developed for epoxy resins. Uncured epoxy tablets are fabricated by pressing commercial powders in a steel mold at room temperature and used as foam precursors. The tablets foam when heated in a muffle at high temperature. No blowing agent was added because the foaming mechanism depends…
Polyols with the hydroxyl value OHV from 290 to 318 mg KOH/g are synthesized from rapeseed, sunflower seed, flaxseed, or coconut oils by the way of their: (1) transesterification with triethanolamine or (2) amidization with diethanolamine. The influence of water as the blowing agent on the storage stability of the pol…
ADVERTISEMENT RETURN TO ISSUEPREVNoteOne-Pot Synthesis of Hyperbranched Polyethylenes Tethered with Polymerizable Methacryloyl Groups via Selective Ethylene Copolymerization with Heterobifunctional Comonomers by Chain Walking Pd−Diimine CatalysisJianli Wang, Kejian Zhang, and Zhibin YeView Author Information School of…
As a promising, environmentally friendly alternative for the toxic and carcinogenic chromate conversion surface finishing, zeolite coatings on various metal alloys have shown excellent corrosion resistance, strong adhesion to substrates, and extraordinary thermal and mechanical properties. This review summarizes recen…