Materials Literature
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The rustling sounds of seven samples are recorded in order to determine the sound characteristics of polyester warp knitted fabrics according to construction type. Physical sound parameters (LPT, ΔL, Δf, ARC) and Zwicker's psychoacoustic parameters of loudness ( z), sharpness ( z), roughness ( z ), and fluctuation str…
Samples of quartz annealed at high temperatures are known to exhibit thermoluminescence (TL) properties which depend on the rate of cooling of the samples to room temperature. Powder samples of Arkansas quartz were annealed in air at temperatures between 500 and 900 °C and were cooled to room temperature at different…
A full-scale crash test of a prototype composite helicopter was performed at the Impact Dynamics Research Facility at NASA Langley Research Center in 1999 to obtain data for validation of a finite element crash simulation. The helicopter was the flight test article built by Sikorsky Aircraft during the Advanced Compos…
This paper describes the first reported occurrence of berlinite (AlPO 4 ) formed entirely under sedimentary conditions. Berlinite appears as grayish or colorless fine crystals in vacuoles and along cracks in heavily compacted, phosphate-rich sediments within the Cioclovina Cave in Romania. The X-ray powder diffraction…
David C Joy; Introduction to the Scanning Electron Microscope, Microscopy and Microanalysis, Volume 9, Issue S02, 1 August 2003, Pages 1556–1557, https://doi.or
Abstract Vermiculites and phlogopites can be exfoliated by chemical and thermal treatment methods to obtain chemically inert, adsorbent, fire-resistant, low-density materials with excellent thermal and acoustic insulation properties. The water content of the clay generally determines the extent of exfoliation and the…
In this paper, carbon-14 inventory of Wolsong Nuclear Power Plant (NPP) which has CANDU type reactors was estimated for 1984–2002. The carbon-14 inventory can be estimated based on a simple relation: [carbon-14 inventory]=[carbon-14 production]—[carbon-14 emission]. The second term can be calculated whereas the third…
Ultradisperse detonation diamond (UDD), a nanodiamond having particle size around 4 nm has been treated with ozone in an aqueous slurry. The reaction kinetics appeared to be relatively slow and long ozonation times were needed in order to functionalize the surface of a special nanodiamond sample with a very low degree…
ZnO films have been prepared on (0001) sapphire substrates by the sol-gel method from a 2-methoxyethanol solution of zinc acetate dihydrate stabilized by monoethanolamine. The structural properties of the films have been characterized by X-ray diffraction, compared with the films on silica glass substrates. The crysta…
Abstract Blends of copolymers of ethylene/hexene (9 CH 3 /1 000 C) and ethylene/butene (77 CH 3 /1 000 C) synthesized with metallocene catalysts were prepared by co‐precipitation from solution. A phase diagram for this blend had been obtained in a preceding work, where the blends were found to be miscible in the melt…
Boron nitride (BN) nanotubes having only tens of nanometers in diameter and open tip-ends were uniformly filled with a MgO 2 -based material. The crystal structures and chemical compositions of the tubes and filling media were analyzed using high-resolution and energy-filtered electron microscopy, electron diffraction…
Abstract Based on previous work a number of optimum extruded blends with high contents of a high barrier ethylene‐vinyl alcohol copolymer were selected and characterized in terms of phase morphology, water sorption and barrier properties. Blend components were an ethylene vinyl‐alcohol copolymer (EVOH with 32 mol% eth…
Cavitation, induced by ultrasound at low frequencies, is an effective means for the disintegration of bacterial cells. Two effects can be observed: at low ultrasound doses bacteria flocs can be declumped by mechanical shear stresses, and at increased doses ultrasound cavitation has an impact on the cell walls such tha…
Molecular orbital calculations for an ErO6 cluster predicted a stable C4v pseudo-octahedron with an Er displacement of ∼0.1 Å from the center of the octahedron with an Er–O bond length of 2.27 Å. In this particular configuration, the hybridization balance of O 2p–Er 6s with O 2p–Er 5d minimizes electron transfer from…
Dendrimers are multibranched compounds exhibiting a well-defined chemical structure with the possibility of encapsulating metal ions or organic molecules in their internal dynamic cavities. When the hosting dendrimer and/or the guest are luminescent, quenching/sensitization processes may occur that can be exploited fo…
Abstract Microstructural changes induced by the microbial reduction of Fe(III) in nontronite by Shewanella oneidensis were studied using environmental cell (EC)-transmission electron microscopy (TEM), conventional TEM, and X-ray powder diffraction (XRD). Direct observations of clays by EC-TEM in their hydrated state a…
Antiferroelectric Pb(Nb,Zr,Sn,Ti)O3 (PNZST) thin films were deposited via a sol–gel process on LaNiO3-buffered Pt/Ti/SiO2/Si substrates. The highly (100)-oriented LaNiO3 buffer layer facilitated the formation of high-quality PNZST films with a strong (100) preferred orientation. These films showed improved electric fa…
Various methods of synthesis of phosphorus dendrimers are presented, in particular a fast method which allows creating each generation in only one step, while multiplying by 5 the number of end-groups. These methods of synthesis can easily be modified to place selectively on the surface, inside, within the branches or…
We have evaluated the surface energy and characterized the wettability of cluster-assembled carbon films deposited on polyethylene, Si and Al substrates by a sessile-drop method using water and glycerol. The effective surface energy of nanostructured carbon is of the order of 30 mJ/m 2 as calculated using the Fowkes a…
Xanthates, thiocarbamates and trithiocarbonates are highly useful compounds in surface and colloid science and in the context of nanotechnology of particles, self-assembly and surfaces. Similar to thiols they have a strong affinity to metal and metal ion-containing surfaces and particles. However they are relatively r…