Materials Literature
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Thermal transport across nanosized constrictions is calculated considering wave effects. It is shown that Rayleigh-type phonon diffraction reduces thermal transport across nanosized constrictions at low temperatures. We show that for aT∕vDebye<0.01×10−9Ks, where a is the radius of the constriction, T the temper…
Nanocomposites with multi-walled carbon nanotubes (MWNT) and polystyrene (PS) were synthesized via an in-situ bulk sonochemical polymerization under the application of ultrasonication to open pi-bonds in the MWNT, thus enhancing the PS polymerization. Sonication of vinyl monomers such as styrene leads to radical initi…
The present article describes the modeling and simulation of the dynamics of the electrospinning process coupled with the spatio-temporal evolution of fiber morphology driven by concentration sweeps. The electrospinning process has been modeled based on an array of beads connected by Maxwell’s elements in a cylindrica…
Buried carbon steel fuel transmission pipelines, protected by external coatings and cathodic protection, are known to experience transgranular stress corrosion cracking TGSCC). Failure analysis of failed pipelines and laboratory tests have indicated that hydrogen plays an important role in the overall failure mechanis…
Optical properties in the vacuum ultraviolet (VUV) region of cerium and terbium activated Y3Al5O12 powders obtained by the sol-gel process were investigated at room and low temperatures. Both Tb3+ and Ce3+ doped samples exhibited a broad absorption band within the conventional Xe-Ne plasma emission range (140–190 nm).…
Nephrogenic systemic fibrosis (NSF) is a disease recently described in patients with kidney failure. It is characterized by scleroderma-like thickening of the skin, subcutaneous edema and ensuing joint contractures leading to profound disability. Furthermore, involvement of internal organs has been described. Whereas…
Acceptor-doped ferroelectrics generally show a pronounced aging effect. However, the KF-flux-grown BaTiO3 single crystals, which are known to contain acceptor impurities K+, show no aging effect. This exception poses a potential challenge to the current understanding of ferroelectric aging and may provide a clue for r…
To analyze the effect of the support crystallite size on the activity of gold catalysts for CO oxidation, gold was supported on rutile with crystallite sizes between 10 and 76 nm. The catalysts were characterized by X-ray powder diffraction, refinement of the crystalline structures, transmission electron microscopy, a…
We developed and tested a parallel plate shear cell that can be mounted on top of an inverted microscope to perform confocal real-space measurements on complex fluids under shear. To follow structural changes in time, a plane of zero velocity is created by letting the plates move in opposite directions. The location o…
In this paper, we analyze the influence of Al doping on microstructure and light emission efficiency of ZnO nanoparticles obtained by the hydrothermal method and after vapor condensation method, where vaporization of the precursor powders was caused by high solar energy and subsequent deposition. We report an increase…
Diamond thin films with a broad range of microstructures from a ultrananocrystalline diamond (UNCD) form developed at Argonne National Laboratory to a microcrystalline diamond (MCD) form have been grown with different hydrogen percentages in the Ar∕CH4 gas mixture used in the microwave plasma enhanced chemical vapor d…
Without any additional donor dopants, BaTiO 3 –(Bi 1/2 Na 1/2 )TiO 3 (BT–BNT) positive temperature coefficient of resistivity (PTCR) ceramics were successfully prepared by a wet-chemistry route. With 2 mol % BNT addition, the obtained BT–BNT ceramics had semiconductivity and exhibited a PTCR behavior at about 155 °C.…
A Ru 2 5+ compound having two crystallographically independent molecules that differ only in that one molecule has an additional hydrogen bond shows Ru−Ru distances that vary by ca. 0.07 Å at 30 K; as the temperature is raised, one molecule displays a spin transition but the other one remains in the same spin state, a…
Nephrogenic systemic fibrosis (NSF), also known as nephrogenic fibrosing dermopathy (NFD), occurs in renal failure patients after gadolinium contrast exposure. The fibrosis of the dermis and subcutaneous septae accompanies fibrosis of other organs, including the heart, liver, lungs, and muscle. The fibrotic skin demon…
The results of x-ray structural studies of the [N(C2H5)4]2CdBr4 crystal at low temperatures are presented. The unit cell parameters and the thermal expansion coefficients along the main crystallographic directions are measured at temperatures in the range from 90 to 320 K. The integrated intensities of the diffraction…
Surface morphology and crystallinity of YVO 4 : Sm 3+ thin films have an influence on the photoluminescence characteristics. The YVO 4 : Sm 3+ films have been deposited on Al 2 O 3 (0001) substrates using pulsed laser deposition method. The films were grown at the various substrate temperatures changing from 500 to 70…
In the present paper there are presented results concerning comparative corrosion resistance of some austenitic stainless steels, with or without silicon content. The silicon content is varying in the range of 1-5 %, in a matrix of alloyed austenite, containing 20% Cr and 15-18%Ni and with very low carbon contents (lo…
Abstract The effects of 3‐dodecylsulfanyl‐propionic acid 3‐(3‐dodecylsulfanyl‐propionyloxy)‐2,2‐bis‐(3‐dodecylsulfanyl‐propionyl‐oxymethyl)‐propyl ester (SO), 3,9‐bis‐octadecyloxy‐2,4,8,10‐tetraoxa‐3,9‐diphospha‐spiro[5,5]undecane (POf), and 3,9‐bis‐(2,6‐di‐tert‐butyl‐4‐methyl‐phenoxy)‐2,4,8,10‐tetraoxa‐3,9‐diphospha‐…
The magnetic properties of nonoriented electrical steels are influenced by grain size and texture of final products. The key technology in the commercial production of nonoriented electrical steels is to grow grains with {hk0}<001> texture up to the optimum size in the final annealing process. The problems relat…
Adsorption potential distributions (APDs) were calculated from nitrogen adsorption isotherms for macroporous silicas, and for disordered and ordered mesoporous silicas without and with organic groups attached to the surface. It was shown that the APDs for porous silicas and organosilicas differ significantly from thos…