Materials Literature
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Crystals of acentric α-resorcinol (space group Pna 2 1, point group mm 2), grown from the vapor phase, present a wide range of morphological forms. Increase in supersaturation (σ) yields, successively, prismatic (σ ∼ 0.001), columnar (σ ∼ 0.003), needlelike (σ ∼ 0.005), and, finally, hexagonal platelike (σ > 0.007) mo…
In this paper, the calibration and workability of magnetoelastic (ME or EM) stress sensors for large steel cables used in Qiangjiang 4th bridge in China are discussed. As an engineering application of magnetoelasticity, EM sensors make non-contact stress monitoring possible for steel hangers and post-tensioned cables…
The paper reports on the preparation, characterization, and dispersion of cadmium sulfide (CdS) nanowires using ordered mesoporous silica, SBA-15, as a template. A homogeneous and stable dispersion of hierarchically ordered CdS nanowires in water solubilized with sodium dodecyl sulfate (SDS) has been obtained. Direct…
Aluminas having hierarchical bimodal pore structures with regular arrayed macropores interconnected with mesopores were synthesized in a cone/plate apparatus that provided well-defined hydrodynamic conditions. A parametric synthesis study was performed to better understand the synthesis conditions required to form the…
Molecularly flat and extremely long bundle-like assemblies were prepared from cadmium hydroxide nanostrands and polysulfonated dyes. The dye molecules were regularly aligned along with the nanostrands, as confirmed by electron microscopies and UV-vis absorption spectroscopy. Strong electrostatic interaction between th…
This paper presents preliminary results from study of a magnetostrictive energy harvesting transducer. The magnetostrictive samples studied in the device were 1/4" diameter and 2" long cylindrical rods of commercially available Terfenol-D and research-grade specimens of a new ductile Iron-Gallium alloy known as Galfen…
A convenient route for the synthesis of high-quality overcoated II-VI quantum dots (QDs) is reported in this paper. Simple salts, such as Cd(Ac)2 and Zn(Ac)2 were used to replace organometallics, whose disadvantage is obvious. Size-tunable core/shell structured QDs (CdSe/ZnS, CdSe/CdS, etc.) were synthesized. They wer…
Stress corrosion cracking (SCC) initiation tests were conducted on Alloy 600 and Alloy 600 weld metal (EN82H) at elevated temperatures (315°C to 360°C). Tests were conducted with insitu monitored smooth tensile specimens under a constant load in both hydrogen dearated and aerated environments. The use of uniaxial tens…
The effect of postmodification of polyelectrolyte multilayer microcapsules by exposure to organic solvent/water mixtures on their permeability, morphology, and mechanical properties is investigated. We study microcapsules with ultrathin shells composed of alternating polystyrene sulfonate and polyallylamine hydrochlor…
Pb ( Zr x Ti 1 − x ) O 3 (PZT) thin films were coated on Pt/Ti/SiO2/Si substrates by a sol-gel method and then crystallized by 28 GHz microwave irradiation. The elevated temperature generated by microwave irradiation to obtain the perovskite phase is only 480 °C, which is significantly lower than that of conventional…
We describe a novel technique of using fluorescent silica nanoparticles (FSNPs) to detect over-expressed folate receptors, as typical for certain malignancies (metastatic adenocarcinoma, pituitary adenoma and others). Using Stöber's method with some modification, 135 nm size FSNPs were synthesized by a hydrolysis and…
Abstract Reaction of a Mg-Al carbonate layered double hydroxide (LDH) with boric acid leads to a borate-pillared LDH with the stoichiometry [Mg 0.65 Al 0.35 (OH) 2 ][B 3 O 5 ] 0.35 .0.65H 2 O and an interlayer spacing of 1.07 nm. Infrared and 11 B magic angle spinning nuclear magnetic resonance data are consistent wit…
We report results on the desorption of OH- induced by 0-19 eV electrons incident on self-assembled monolayer films made of single and double DNA strands of different orientations with respect to a gold substrate. Such measurements make it possible to deduce the mechanism and site of OH- formation within a biomolecule…
Polypropylene/silica (PP/Silica) composites were prepared by two steps: tetraethyl orthosilicate (TEOS) was first impregnated into PP matrix using supercritical carbon dioxide (SC CO 2 ) as a swelling agent and carrier followed by hydrolysis/condensation reaction of TEOS confined in polymer network. The effects of soa…
Abstract The accuracy of quantitative XPS analysis can be improved using predetermined transmission functions. Two different calibration methods are used for estimating the transmission function T ( E ) of a photoelectron spectrometer, applying a survey spectra approach (SSA) and a quantified peak‐area approach (QPA)…
Single-step synthesis of well-crystallized and pure barium titanate nanoparticles in supercritical fluids, Reverón, Helen, Aymonier, Cyril, Loppinet-Serani, Anne, Elissalde, Catherine, Maglione, Mario, Cansell, François
Austenitic stainless steels are the most favoured construction materials for various components required in chemical, petrochemical, fertiliser and nuclear industries. However, these steels are prone to sensitisation. In the sensitised condition, the steels are quite susceptible to intergranular corrosion and intergra…
The synthesis of ZnO nano-needles using unbalanced magnetron sputtering is reported. A multilayer structure comprised of ZnO(50 nm)/Zn(20 nm)/ZnO(2 µm) was grown on a stainless steel substrate without substrate heating. The growth of ZnO nano-needles was observed on the surface of the multilayer structure after post-a…
Abstract Transmission electron microscopy (TEM) has been used to demonstrate the biological formation of a hollow spherical halloysite-like mineral in freshwater systems. The interaction between clays and microbes was investigated in microbial films from laboratory cultures derived from natural sediments. Optical and…
V(2)O(5) x nH(2)O xerogel films with n = 1.6, 0.6, and 0.3 have been prepared from the sol-gel route by reacting V(2)O(5) with H(2)O(2) followed by drying under ambient conditions and thermal annealing at 110 and 250 degrees C, respectively. After dehydration, V(2)O(5) crystallizes at 300-330 degrees C, as revealed by…