Materials Literature
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A thermodynamics based analysis of measured material behavior in (110) orientated (PMN-32%PT) and (PZN-4.5%PT) crystals under combined stress, electric field and temperature loading leads to a determination of the relative energy levels of phases. The approach is to perform path integrals to determine external work do…
Abstract The interactions of two different porphyrins, without axial ligands—5,10,15,20‐tetrakis(1‐methylpyridinium‐4‐yl)porphyrin‐Cu(II) tetrachloride (Cu(II)TMPyP) and with bulky meso substituents—5,10,15,20‐tetrakis( N , N , N ‐trimethylanilinium‐4‐yl)porphyrin tetrachloride (TMAP), with (dG‐dC) 10 and (dA‐dT) 10 w…
The principle of a Weissenberg camera is applied to surface crystallographic analysis by reflection high-energy electron diffraction. By removing inelastic electrons and measuring hundreds of patterns as a function of sample rotation angle phi, kinematical analysis can be performed over a large volume of reciprocal sp…
We present a methodology for modeling atomically layered nanoporous carbonaceous solids. Our method models carbon atoms interacting on sets of analytically defined surfaces, in conjunction with reverse Monte Carlo techniques (RMC). Our approach allows the construction of large, physically realistic nanoporous models o…
A lithium gadolinium phosphate crystal, LiGd5P2O13, has been synthesized by a high temperature solution reaction and solved by single-crystal X-ray diffraction data. The structure is monoclinic, space group C2/m, with unit cell parameters a = 18.645(3), b = 5.6257(5), c = 12.014(2) A, beta = 117.55(6)degrees, V = 1117…
We examine the morphological structures of asymmetric poly(ethylene oxide)-b-poly(1,1'-dihydroperflurooctyl methacrylate) (PEO-b-PFOMA) thin films upon annealing in a compressible fluid, supercritical CO2 (Sc-CO2). The strong affinity between PFOMA and CO2 is found to induce phase segregation when annealing PEO-b-PFOM…
Binary polyimide (PI) blends with hexafluoroisopropylidene (-C(CF3)2-) group were prepared using three poly(amic acid) solutions derived from 4,4′‐hexafluoroisopropylidene diphthalic anhydride (6FDA), 4,4′‐oxydianiline (ODA), p‐phenylenediamine (PDA), and pyromellitic dianhydride (PMDA). Films of both blends: PI6FDA‐O…
Abstract To diversify edible‐oil polymer composite, polymeric linoleic acid (PLina) peroxide was obtained by the auto‐oxidation of linoleic acid in a simple way for use as a macroinitiator in free radical polymerization of vinyl monomers. Peroxidation, epoxidation, and/or perepoxidation reactions of linoleic acid unde…
The potential of cast magnesium alloys for being used as structural materials in lightweight applications is assessed. The ability of the alloys for mechanical performance is evaluated and compared against the ability of widely used structural aircraft cast aluminum alloys. The specific quality index QDS, devised for…
We report studies of the modification of the band structure of single-walled carbon nanotubes through encapsulation of the inorganic material manganese ditelluride $(\mathrm{Mn}{\mathrm{Te}}_{2})$. Using photoluminescence excitation mapping we show that this leads to a global reduction of their first and second band g…
We report quantitative experimental study correlating the structure and mechanical properties of fibers made from single-walled carbon nanotubes (SWNTs) and polyvinyl alcohol (PVA). A post-synthesis solvent drawing treatment is used to vary nanotube alignment, whose detailed understanding is a prerequisite for fiber d…
Technetium, found in some nuclear wastes (such as those generated from spent fuel reprocessing), is of particular concern with regard to long-term waste storage because of its long half-life (2.13 x 10(5) years) and high mobility in the environment. One method of stabilization of such waste is through vitrification to…
Bound to be selective: A new method of enzymatically controlled nanoparticle assembly has been developed by using a restriction enzyme that recognizes an asymmetric DNA site (see schematic representation). The site-selective binding of gold nanoparticles to each other and to surfaces has been demonstrated in proof-of-…
Water-based, biodegradable polyelectrolyte complex dispersions (PECs) prepared by mixing oppositely charged polyions are advantageous drug delivery systems due to constituent biocompatibility and nanoparticulate architectures. Reaction phase environmental parameters dictate PEC physicochemical properties, and specific…
The supramolecular self-assembly within a liquid crystalline block copolymer thin film with mesogenic semifluorinated alkyl side groups was studied using both grazing incidence X-ray diffraction and small angle scattering. Previous studies employing near-edge X-ray absorption fine structure spectroscopy indicated that…
Properties of a new type of pyroelectric ceramic structure containing a layer of known porosity laminated between two dense layers, to form a functionally gradient material (FGM), are reported. The combination of theoretical models for pyroelectric, dielectric, and thermal properties gave a model for the pyroelectric…
Room-temperature ultraviolet emission of Tm(3+) ions at 298 ((1)I(6)-->(3)H(6)), 364 ((1)D(2)-->(3)H(6)), and 391 nm ((1)I(6)-->(3)H(5)) was obtained in Y(2)O(3):Yb(3+)-Tm(3+) by continuous-wave diode laser excitation of 980 nm. Power dependence analysis demonstrates that five- and six-photon upconversion processes po…
The reaction of Me 3 Ga with an excess of 4-methylbenzyl alcohol (4-MeC 6 H 4 CH 2 OH) in toluene, under reflux conditions, resulted in the formation of the sesquialkoxide [Ga{MeGa(OCH 2 C 6 H 4 Me-4) 3 } 3 ] ( 1 ). In contrast, reaction of Me 3 In with excess of 4-methylbenzyl alcohol (4-MeC 6 H 4 CH 2 OH) under the…
The aim of the article is the modeling of the rearrangement process between martensite variants in order to use magnetic shape memory alloys (MSMs) as actuators. In the framework of the thermodynamics of irreversible processes, an efficient choice of the internal variables to take into account the magnetic and mechani…
Silicon carbide (SiC) ceramic coating was developed from precursor polymer blend of polycarbosilane and polyvinylsilane on porous alumina substrate by radiation curing. The polymers were crosslinked with oxygen present in the atmosphere during irradiation and pyrolyzed at 850°C in order to convert the polymer into SiC…