Materials Literature
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Dimensional stability and structural reliability are major concerns for thermoplastics due to their nature of high mobility of polymer chains. Here the authors report the creep experiments on polypropylene filled with 1vol% TiO2 nanoparticles with diameter of 21 or 300nm at different load levels and temperatures, whic…
The second paper in a set of reviews of radiation effects on thermal properties of polymers is devoted to polytetrafluoroethylene (PTFE). The specificity of the radiation physics and chemistry of this material is relatively well investigated and it is widely used in different applications under radiation impact. Degra…
Spectroscopic and electronic field-effect transistor measurements reveal complimentary information about molecular interactions with single-walled carbon nanotubes (SWNTs). Here we demonstrate how these two complimentary techniques can be combined to further understand electronic modifications of the SWNTs. The compli…
Zwei Wege, ein Ziel: Harte Röntgenstrahlen können bei tiefer Temperatur lichtschaltbare molekulare Spinübergangsverbindungen in metastabile High-Spin-Zustände anregen (siehe Bild). Diese haben ähnliche spektroskopische Eigenschaften wie die bekannten LIESST-Zustände, und die Bildungs- und Zerfallsreaktionen deuten auf…
Abstract In this article, the effect of ultrasonic oscillation on the dispersed morphology of attapulgite in polypropylene (PP) and crystallizing kinetics of PP/attapulgite composites prepared through extrusion in the presence and the absence of ultrasonic oscillation were studied. X‐ray diffraction analysis results s…
Compositionally graded ferroelectrics produce internal potentials that manifest themselves as asymmetric hysteresis in polarization versus applied field plots. The direction and magnitude of the built-in fields depend on the sense of the chemical gradient in unclamped graded ferroelectrics. A thermodynamic model was e…
High-yield uniform β-Ga2O3 nanowire films with mesh structure on GaP substrate have been synthesized via heat treating porous GaP preevaporated Au under low vacuum. The single-crystalline β-Ga2O3 nanowires have uniform diameters of about 100nm and a preferential [001] growth direction along the axis. The as-prepared β…
The production yields of H(D) atoms in the reactions of N(2)(A (3)Sigma(u) (+)) with C(2)H(2), C(2)H(4), and their deuterated variants were determined. N(2)(A (3)Sigma(u) (+)) was produced by excitation transfer between Xe(6s[32](1)) and ground-state N(2) followed by collisional relaxation. Xe(6s[32](1)) was produced…
Shaping up: Unusual bowl-, trough-, and ring-shaped structures result from the temperature-induced self-assembly of nanoparticles (see picture for bowl). The obtained ZnO bowls and rings also serve as a template to make metal or metal oxide replicas. The tiny bowls are envisaged not only to hold fluids of ultralow vol…
Low temperature photoluminescence (PL) measurements were carried out to investigate optical transition characteristics of ZnO nanowires, Ni nanodot, and NiO coated ZnO nanowires (NWs). PL emission spectra show emission peaks of distinctive bound exciton to neutral donor (DX0) and to acceptor (AX0) transition. The auth…
X-ray photoelectron spectroscopy (XPS) measurement of the ratio of poly(3,4-ethylenedioxythiophene) (PEDT) to polystyrenesulfonate (PSS) reveals accumulation of PEDT+ at the interface between the PEDT:PSSH hole-injection layer and the organic semiconductor during diode operation. This ionic drift of PEDT+ occurs even…
Ti—6Al—4V matrix composites enhanced by alumina tubes filled with boron carbide, alumina rods, and alumina plate is termed high gradient composite because of the big density differences among Ti—6Al—4V, alumina, and boron carbide materials. This high gradient composite has been developed for a theoretical study to hel…
( Co x Al 1 − x ) 2 O 3 − v oxide magnetic semiconductor films were synthesized by introducing an impurity band in the insulating Al2O3 band gap, and the corresponding granular films were obtained by annealing. For both kinds of films, their electrical transport properties are well described by spin dependent variable…
A new aromatic diamine monomer containing both pyridine and fluorine, 2,6-bis(4-amino-2-trifluoromethylphenoxy-4 ' -benzoyl)pyridine (BAFP), was successively synthesized by the nucleophilic substitution reaction of 2,6-bis(4,4 ' -dihydroxybenzoyl)pyridine with 2-chloro-5-nitro-trifluoromethylbenzene in the presence of…
The new arsenates KFe 3 (AsO 4 ) 2 (HAsO 4 ) 2 ( C 2/ c ; Z = 4; a = 18.975(4), b = 6.5850(13), c = 10.955(2) A, β = 100.42(3)°, V = 1346.3(5) A 3 ) and K(H 2 O) M 3+ (H 1.5 AsO 4 ) 2 (H 2 AsO 4 ) ( P 2/ n ; Z = 2; a = 4.700(1), 4.641(1), 4.798(10); b = 8.712(2), 8.696(2), 8.832(2); c = 13.828(3), 13.772(3), 13.971(3)…
The polyimides containing the hydroxy group were synthesized from 3,3 ' -dihydroxybenzidine (I) and previously prepared tetracarboxylic dianhydrides, 3,3 ''' ,4,4 ''' - p-quaterphenyltetracarboxylic dianhydride (IId), 3,3 '''' ,4,4 '''' - p-quinquephenyltetracarboxylic dianhydride (IIe) and 3,3 ''''' ,4,4 ''''' - p-se…
The infrared (IR) transmitting nanocrystallized chalcogenide glass only containing α-CdGa2S4 IR nonlinear optical crystallites, which were confirmed by x-ray diffraction and Raman scattering measurements, was fabricated through the controllable nucleation and crystallization of the glass with the composition 82GeS2∙18…
A rare mineral schafarzikite, an oxide of Fe 2+ and Sb 3+ , was found after more than 80 years at the type locality near Pernek (Male Karpaty Mountains, Slovak Republic). Crystals, druses, and crusts of schafarzikite occur on fractures in quartz-carbonate-stibnite hydrothermal ores. The Sb mineralization is bound to b…
Avian eggshell is a relatively simple model of biomineralization processes. This biomaterial consists mainly of a mineral part made of columnar calcite crystals and a pervading organic matrix. The organization of eggshell microstructure is determined by genetic, physiological and external factors. Eggshell microstruct…
Abstract In this study, we investigated the melting and crystallization behavior of polyhedral oligomeric silsesquioxane (POSS)‐capped poly(ε‐caprolactone) PCL with various lengths of PCL chains by means of X‐ray diffraction and differential scanning calorimetry. This organic–inorganic macromolecule possesses a tadpol…