Materials Literature
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A mesoporous form of titanium phosphate has been prepared by reaction between phosphoric acid solution and either titanium propoxide or titanium chloride in the presence of trimethylammonium surfactants. The surfactant can be almost completely removed by extraction using acidified ethanol. The surface area of the extr…
Soil properties indicative of shrink–swell potential were studied for 12 soils encompassing several parent materials in Virginia. Soils are rated from moderate to very high shrink–swell potential. The mineralogy classes, soil series, and (parent materials) examined include: smectitic—Iredell (hornblende gneiss), Jackl…
Poly(aniline), electrochemically deposited on an electrode surface in the presence of poly(acrylic acid), forms a film which remains protonated, and conducting, at pH 7. The resulting modified electrode is an electrocatalytic surface for NADH oxidation at +0.05 V vs. SCE in 0.1 M citrate–phosphate buffer at pH 7. The…
Polycrystalline LiAlH4 transforms into polycrystalline Li3AlH6 and Al during short time (5 min) ball-milling with 3 mol% TiCl4 at room temperature; solid-state rearrangement of tetrahedral [AlH4]− into octahedral [AlH6]3− at ambient conditions was previously unknown; this transformation does not occur during ball-mill…
A novel approach described earlier for improving polymer substratum biocompatibility(1) is further elucidated. Polysulfone (PSf) spin-coating films were modified by covalent end-on grafting of hydrophilic and sterically demanding photo-reactive poly(ethylene glycol) (PEG) conjugates (ABMPEG; 10 kDa). The degree of gra…
Silica having a regular mesoporous structure induced by micelle templating (MTS) was functionalised with n-propyltrimethoxysilane under anhydrous conditions. Support modification was characterised by various methods (X-ray diffraction, FTIR spectroscopy, thermogravimetry, nitrogen adsorption volumetry, microcalorimetr…
The thermal expansion behavior and mechanism of A‐site‐deficient lanthanum manganite perovskites, La 1 − x MnO 3 ( 0 < x ≤ 0.1 ) , and alkaline earth metal (AE)‐doped lanthanum manganite perovskites, La 1 − x AE x MnO 3 ( AE = Ca and Sr , 0 ≤ x ≤ 0.4 ) , under oxidizing atmospheres have been investigated. The average…
Partially derivatized cellulose esters were prepared from dissolving-grade wood pulp fibers by reaction with a mixed p-toluene sulfonic/hexanoic anhydride system in a nonswelling (cyclohexane-based) reaction medium. The partially derivatized pulp fibers, which failed to undergo a significant change in shape or appeara…
Current efforts of new stent technology have been aimed largely at the improvement of intravascular stent biocompatibility. Among the chemical characteristics of metallic stents, surface oxide corrosion properties are paramount. Using our unique technique, the currently marketed 316 L stainless steel and nitinol stent…
Investigations of impurity centers, electrical resistivity and microstructure of BaTiO3 ceramics doped with rare-earth ions Y, La, Nd, Sm, Dy and Lu at concentrations x = 0.001–0.005 were carried out. Electron paramagnetic resonance, X-ray diffraction and electron microscopy were used for measurements. The most intens…
The potential‐dependent breakdown of the native oxide film (∼20 Å thick) on titanium has been investigated in aqueous solutions and in solutions that contain a mixture of and anions that inhibit oxide breakdown ( i.e. , , , , , and . The oxide film is unstable in neutral pH solutions containing only , resulting in the…
Magnesium-lithium single crystals were stretched in the [11\bar20] direction to investigate the deformation behavior by non-basal slip. {11\bar22}〈\bar1\bar123〉 second order pyramidal slip is activated in magnesium −3.5 at%, −7.5 at% and −10.6 at% lithium alloy single crystals, and its yield stress shows anomalous tem…
The skin acts as a barrier to exogenous substances, pathogens, and trauma. Skin defects caused by burns, venous ulcer, diabetic ulcer, or acute injury occasionally induce life-threatening situations. Tissue engineering provides an alternative for autologous or allogeneic tissue transplantation, which is required becau…
Experimental and theoretical studies of basic forms of polyaniline are presented. Experimental spectra of emeraldine, leucoemeraldine and pernigraniline and their oligomer model compounds (diphenylamine, phenyl-end-capped dimer, phenyl-end-capped tetramer, phenyl-end-capped hexamer, imine form of phenyl-end-capped dim…
A breakthrough has been made for magnets to be used at high temperatures. A new class of Sm(Co/sub w/Fe/sub v/Cu/sub x/Zr/sub y/)/sub z/ type magnets with linear demagnetization curves up to 550/spl deg/C has been developed. A new symbol, T/sub M/, is introduced, which is defined as the maximum temperature at which th…
Although medical applications for shape memory alloys (SMA) now dominate in today’s market, there are many applications in the industrial sector which have reached large volume production that far surpass the material usage in the medical fields. In the early growth of shape memory alloy technology the most important…
Step-wise adsorption of polyelectrolytes is used for the fabrication of micro- and nanocapsules with determined size, capsule wall composition and thickness. The capsule walls made of polyelectrolyte multilayers exclude high molecular weight compounds. Assembling of lipid layers onto these polyelectrolyte capsules pre…
The purposes of this project were to prepare amorphous carbamazepine by dehydration of crystalline carbamazepine dihydrate, and to study the kinetics of crystallization of the prepared amorphous phase. Amorphous carbamazepine was formed and characterized in situ in the sample chamber of a differential scanning calorim…
New N-methylimidazole-functionalized gold clusters 2 catalyze, in 6∶4 methanol–water solution, the cleavage of 2,4-dinitrophenyl acetate with more than an order of magnitude rate acceleration with respect to acetyl-N-methylhistamine 3; comparison with dodecanoyl-N-methylhistamine 4 comicellized with Brij 35 reveals th…
Gram-scale quantities of microcrystalline powdered CeO2–ZrO2 solid solutions can be produced continuously in a near-critical water flow reactor at ca. 300 °C and 25 MPa; rapid hydrothermal co-precipitation leads to nano-particulate Ce1−xZrxO2 (x = 0 to 1), the composition of which is merely determined by the initial c…