Materials Literature
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A thermally stimulated structural transformation of the Si-O phase in the SiO x layers, which leads to the formation of Si nanoinclusions, was investigated using gravimetry, infrared spectroscopy, multiple-angle ellipsometry, and atomic-force microscopy. It is demonstrated that vacuum heat treatment leads to an increa…
Oxygen permeabilities (OP) of CO(2)-casein (CO(2)CN), calcium caseinate (CaCN), and acylated casein (AcCN) films were determined as functions of % relative humidity (% RH), temperature, and plasticizer type. Tensile properties and water vapor permeabilities (WVP) were also measured. Plasticizers were glycerol (GLY) or…
The interaction between hydrogen and α-Ca3N2 has been investigated by temperature programmed adsorption–desorption and pressure–composition (P–C) isotherms and also by X-ray powder diffraction. We find that hydrogen adsorption by Ca3N2 begins at temperatures around 300 °C. Approximately 3.5 H atoms can be adsorbed by…
Anthracene anions bound to a liquid-liquid interface and charged by photochemically reduced Keggin ions when exposed to aqueous chloroaurate ions result in the formation of high concentration of thin, gold nanosheets at the interface.
The melting and freezing plateaus of four metal carbide‐carbon (MC‐C) eutectics, B4C‐C, δ(Mo carbide)‐C, TiC‐C and ZrC‐C eutectics were investigated by radiation thermometry for the first time. The observed melting temperatures were 2386 °C, 2583 °C, 2761 °C and 2883 °C, respectively. The plateau shapes of δ(Mo carbid…
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The lustrin superfamily represents a unique group of biomineralization proteins localized between layered aragonite mineral plates (i.e., nacre layers) in mollusk shell. These proteins not only exhibit elastomeric behavior within the mineralized matrix, but also adhesion to the aragonite-containing composite layer. On…
A theoretical model is suggested which describes the transformations of grain-boundary dislocation walls and their influence on diffusion processes in nanocrystalline materials fabricated under highly non-equilibrium conditions. It is shown that the decay of boundary dislocation walls of finite extent, occurring via t…
Chloride stress corrosion cracking (SCC) of Type 304 and 304L austenitic stainless steels (SS) was studied by a constant load method in air at a temperature of 353K with relative humidity (RH) of 35%. Chlorides simulating sea salt particles were put on the gage section of the SS as droplets of synthetic sea water. The…
A subphthalocyanine (SubPc) dimer linked by racemic 1,1'-binaphth-2,2'-dioxy (BINOL), 1, has been synthesized and characterized by 1- and 2-D 1H NMR, high resolution mass spectrometry (FAB), X-ray crystallography and electronic absorption spectroscopy. Additionally, the dimer derived from optically-active (R)-(+)-BINO…
A series of five new hexaalkylthiohexaazatriphenylenes 2a-e has been synthesized. Their thermotropic behaviour has been investigated and compared with the corresponding series of hexaalkylthiotriphenylenes 1a-e and hexaalkylthiohexaazatrinaphthylenes 3a-e . Unexpectedly, hexaalkylthiohexaazatriphenylenes 2a-e , hexaal…
A polycatenar mesogen consisting of a stiff, four ring aromatic core with three long alkoxy chains and a bulky, perfluorinated substituent has been synthesized and the phase behavior investigated. Due to strong incompatibility among the constitutional moieties, the material can be expected to self-organize into nano-s…
A recently developed discrete dislocation dynamics (DD) model for crystalline materials coupled with finite elements (FE) analysis is reviewed. The three-dimensional continuum-based FE formulation for elastoviscoplasticity incorporates the DD simulation, replacing the usual plasticity constitutive relationships, leadi…
Three-dimensional porous scaffolds made from blend polyesters of polyhydroxyalkanoates (PHA) were evaluated with respect to their effects on collagen II production. Semi-quantitative reverse transcriptase polymerase chain reaction (RT-PCR) was used to assay collagen II mRNA for evaluation of the ability for the blend…
Chitosan is functionalized with phthalic anhydride at the amino group and poly(ethylene glycol) methyl ether at the hydroxyl group via homogeneous reaction. The product regenerated forms particles in either aqueous solution or organic solvents. The particles are spheres with the size of few micrometers as observed fro…
X-ray absorption near edge spectroscopy (XANES), Brunauer-Emmett-Teller surface area, Fourier transform infrared (FTIR), and thermogravimetric analysis were used to characterize two xerogels of V 2 O 5 prepared using the vanadate hydrolysis ( i.e. , the v V 2 O 5 material) or the vanadyl tris(isopropoxide) hydrolysi…
The relation between grain boundary microstructure and oxidation-induced intergranular embrittlement has been investigated in rapidly solidified and subsequently annealed Ni–39 mass%Fe thin ribbons with different grain boundary microstructures. These thin ribbons were heated in air under different tensile stresses to…
The nature of the counter-anion determines the water exchange rate for a series of cationic gadolinium complexes in aqueous solution, as a consequence of the ordering effect that the anion imposes on the structure of the second hydration sphere.
In a fluorous biphasic catalytic system for Baeyer–Villiger oxidation of cyclic ketones, it was shown that Sn[N(SO2C8F17)2]4 catalyst can give an excellent yield and selectivity with the green, safe and cheap 35% aqueous hydrogen peroxide as the oxidant. Furthermore, it was also found that the catalyst can be complete…
In order to control the reactivity of the inorganic precursor and the hybrid formation, the evaporation induced self-assembly procedure (EISA) has been applied to direct alkyl amines into zirconia hybrid composites. It is demonstrated that, with controlled water amounts, a mesostructured wormhole-like high-surface-are…