Materials Literature
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We have developed a high-throughput x-ray characterization system, which can rapidly screen structure, composition and x-ray scintillation of combinatorial materials libraries using energy-dispersive x-ray diffraction, x-ray fluorescence, and x-ray photoluminescence. This system consists of an x-ray source, a polycapi…
By means of first-principles calculations we show that hydrogenated silicon nanowires in the ⟨001⟩ orientation can have a direct band gap with appreciable oscillator strength of the first direct transition if their surface is characterized by dimers displaying the SiH species. The breaking of some dimers (the SiH2 spe…
Abstract The microbiologically influenced corrosion (MIC) is a very dangerous process, which affects the oil industry. The activity and microorganisms' growth at the pipelines steel cause surface modifications, which can induce a more complex corrosion process. The biocide evaluation for the MIC decrease has been norm…
Quasi‐1‐D (one‐dimensional) tungsten disulfide (WS2) nanocrystal was synthesized through a two‐step hydrothermal process. Energy dispersive spectroscopy (EDS) identified that the chemical composition of the final product was WS2. The produced nanocrystal was further characterized with X‐ray diffraction (XRD), transmis…
The effect of lanthanum substitution on the structural, dielectric and piezoelectric properties of lead calcium titanate (PCT) ceramics is studied. Samples with compositional formula Pb0.76− x La x Ca0.24Ti0.98Mn0.02O3 (PLCT) (x = 0–0.08, in steps of 0.02) were prepared by the conventional dry ceramic technique. Phase…
Lead zirconate titanate (PZT) thin films were grown on a Si substrate with an epitaxial relationship by introducing yttria-stabilized zirconia (YSZ), CeO 2 , and (La,Sr)CoO 3 (LSCO) buffer layers. The buffer layers, which facilitated the growth of the epitaxial PZT thin film and controlled the residual stress, were de…
Using the state-of-the-art screened Korringa-Kohn-Rostoker Green function method we study the electronic and magnetic properties of NiMnSb and similar Heusler alloys. We show that all these compounds are half-metals, e.g. the minority-spin band is semiconducting and the Fermi level falls within this gap resulting in 1…
In the present paper, it is proposed that a sudden appearance of a burst Acoustic Emission (AE) signal under an applied dc field, during temperature decrease cycle indicates the structural phase transition (PT) from cubic to tetragonal in soft PZT ceramics (PZT-5A, 5J & 5H). In general, the PT temperature determined b…
In this study, in order to develop low-temperature-sintering ceramics for a multilayer piezoelectric actuator, Pb(Mg 1/2 W 1/2 )O 3 -Pb(Ni 1/3 Nb 2/3 )O 3 -Pb(Zr,Ti)O 3 (PMW-PNN-PZT) ceramics were fabricated using Li 2 CO 3 and CaCO 3 as sintering aids and their dielectric and piezoelectric properties were investigate…
The development of strengthened high carat Au alloys for jewellery applications is an interesting but challenging task, with significant potential for further development of new age-hardenable alloys. The paper first presents an overview on the possibilities and limitations to harden 22ct Au by conventional means, i.e…
Complete phase segregation may occur on a 10cm scale even in the absence of buoyancy due to unidirectional, large-scale rapid bulk flow. Using a hexadecane-acetone nearly density-matched liquid mixture in a 20-cm-long condenser tube with a 1cm diameter, we observed the rapid axial migration of the acetone-rich drops t…
Molecular dynamics simulation has been used to study the equilibrium properties of a generic coarse-grained polymer melt with associating terminal groups, confined in a narrow slit by two atomically smooth walls. Simulations were carried out as a function of wall separation and attracting strength as well as polymer e…
2,7-Bis[2-(6,7,9,10,12,13,15,16-octahydro-5,8,11,14,17-pentaoxabenzocyclopentadecen-2-yl)vinyl]-benzo[1,2-d;3,4-d']bisthiazole, 2, with crown ether styryl moieties substituted on a heterocyclic core, was synthesized and its complex forming ability with several metal cations was evaluated in acetonitrile by absorption…
Blood compatibility was evaluated by short-term in vitro blood perfusion on candidate vascular scaffold surfaces of a biodegradable, porous polylactide scaffold and a chemically surface-modified expanded polytetrafluoroethylene (ePTFE) over a clinical ePTFE, by measuring blood cell adhesion either directly or after ad…
In this paper, we report the study of a new series of symmetric chiral liquid crystalline siloxane dimers, their related monomers, and two of those monomers with heptamethyltrisiloxane attached. All the dimers coupled with a trisiloxane show the SmCA phase, which in several cases has a large tilt angle greater than 40…
Abstract Polyurethanes are one kind of relic protection materials commonly used. During artificial photo‐ageing, three polyurethanes, HDI‐based polyurethane, MDI‐based polyurethane and TDI‐based polyurethane, have been considered to undergo UV radiation. Photochemical degradation of the polyurethanes has been monitore…
No studies have been conducted to evaluate the potassium (K) quantity‐intensity (Q/I) relationships that exist in eastern South Dakota soils and how that may affect K fertility interpretations. The objectives of this study were to i) evaluate the K status of smectite‐dominant soils through quantity‐intensity relations…
The transition frequencies of multibubble systems in a sound field are reexamined to confirm their existence and further clarify their physical properties. We have recently suggested that a gas bubble interacting with a neighboring bubble in a sound field has up to three transition frequencies which invert the pulsati…
The structural and dielectric properties of Bi 2 Ti 2 O 7 –Zn 2 Nb 2 O 7 solid-solution thin films were investigated using (Bi 2- x Zn x )(Nb x Ti 2- x )O 7 (BZNT, 0.05≤ x ≤1.0) pyrochlore thin films prepared on platinized Si substrates by metalorganic decomposition (MOD) process. Thermal analysis and X-ray diffractio…
The synthesis and physical properties of bent‐shaped molecules with ester linkages and methoxy substitution on a non‐central ring are presented. Terminal chains of most mesogens contain a group with double bond, which promotes polymerization. In all the compounds studied a B2 phase just below the isotropic phase has b…