Materials Literature
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The tetrameric titanium alkoxide (MeC(CH2-μ3-O)(CH2-μ-O)2)2Ti4(O-i-Pr)10 (1) catalyzes the ring-opening polymerization (ROP) of lactide (LA) in toluene solution at various polymerization temperatures, and its bulk ROP at 130°C. Compound 1 facilitated reasonably controlled polymerization characteristics via a coordinat…
Literature data for the electrical resistivity of austenitic and ferritic steels are analyzed in a model that takes into account their composition and microstructure. The resistivity in these systems is so high that one must allow for its saturation. That effect is described with the shunt-resistor model, and saturati…
Nanocrystalline silver particles were prepared via a supercritical fluid processing technique RESOLV (Rapid Expansion of a Supercritical Solution into a Liquid SOLVent) coupled with chemical reduction. The preparation involved the rapid expansion of a supercritical ammonia solution of silver nitrate into an ambient so…
A range of mesogenic molecules varying in both bend angle and strength of lateral dipole were synthesized, and their phase behavior was characterized by polarizing microscopy, thermal analysis, X-ray diffraction, and electrooptical measurements. We find the general destabilization of the liquid crystallinity caused by…
The optical absorption spectra of Ag 0, Ag 2 +, transient oligomers, and stable clusters were studied in deaerated methanol by pulse and γ-radiolysis methods and compared with data obtained from studies using other solvents. From the decay of e - solv at 620 nm, the formation rate constant of Ag 0 was determined to be…
The crystallization kinetics and mechanism of a precursor glass of lithium aluminosilicate (LAS)‐based commercial low‐expansion glass‐ceramics were investigated using a dilatometer. The isothermal crystallization behavior of β‐quartz solid solution (ss) was found to obey the Avrami equation. Nonisothermal crystallizat…
Abstract The ability of charge compensation methods to control surface potential is examined for two types of non‐homogenous samples: a small conducting dot on an insulating substrate and an insulating thin film on a conductive substrate. Results demonstrate that two newer types of charge compensation systems have imp…
The objective of this work was to verify if reflected energy of soils can characterize and discriminate them. A spectroradiometer (Spectral reflectance between: 400-2,500 nm) was utilized in laboratory. The soils evaluated are located in Bauru region, SP, Brazil, and are classified as Typic Argiudoll (TR), Typic Eutro…
Abstract Oriented, amorphous poly( D , L ‐lactide) was obtained by drawing injection moulded specimens at temperatures below the glass transition temperature of the polymer and by a non‐conventional injection moulding process in which the melt is cooled under oscillating shear conditions (SCORIM). In both cases effect…
Abstract The three-dimensional coordination polymers, [{Ru2(piv)4}3(H2O)M(CN)6] [M=Fe (1) and Co (2), Hpiv = pivalic acid], have been synthesized and characterized by X-ray crystallography, electronic spectroscopy and magnetic susceptibility measurement.
The effects of finite number of periods (FNP) and finite incident beams on the diffraction efficiencies of holographic gratings are investigated by the finite-difference frequency-domain (FDFD) method. Gratings comprising 20, 15, 10, 5, and 3 periods illuminated by TE and TM incident light with various beam sizes are…
Abstract An efficient civil infrastructure system is essential to every country's productivity, security, and quality of life. Basic research and development in smart structures and designer materials have shown great potential for enhancing the functionality, serviceability, and increased lifespan of civil infrastruc…
Abstract Solution‐grown lamellar single crystals of poly(ϵ‐caprolactone) (PCL) were prepared from a dilute solution of n ‐hexanol by the isothermal crystallization condition or the self‐seeding method. Hexagonal‐shaped lamellar crystals with and without spiral growth were obtained, and the crystals produced well‐resol…
HPr kinase/phosphorylase (HprK/P) controls the phosphorylation state of the phosphocarrier protein HPr and regulates the utilization of carbon sources by Gram-positive bacteria. It catalyzes both the ATP-dependent phosphorylation of Ser-46 of HPr and its dephosphorylation by phosphorolysis. The latter reaction uses in…
Ferroelectric thin films such as barium strontium titanate (BST) and lead zirconate titanate (PZT) are potential materials for high-density dynamic/ferroelectric random-access memory applications. However, the properties of BST and PZT thin films are observed to be significantly inferior to their bulk counterparts. In…
Nanostructured Si thin films, also referred as polymorphous, were grown by plasma-enhanced chemical vapor deposition. The term “polymorphous” is used to define silicon material that consists of a two-phase mixture of amorphous and ordered Si. The plasma conditions were set to obtain Si thin films from the simultaneous…
The synthesis of nanosized powders with targeted properties and their assembly is of considerable importance to the microelectronics industry because of the pervasive drive to miniaturize components. In the current work, synthesis of nanosized silver (Ag) metal platelets was studied. The platelets were synthesized in…
Cadmium sulfide nanoparticles were formed within both modified mesoporous aluminosilicate MCM-41 and siliceous SBA-15. Syntheses involved the formation of a monolayer of silylation reagent, (3-mercaptopropyl)trimethoxysilane, on the surfaces of both MCM-41 and SBA-15, which served to preposition the sulfide source wit…
Abstract The sonochemical reduction of gold(III) [tetrachloroaurate(III)] was carried out under various irradiation conditions in an aqueous solution containing only a small amount of 1-propanol. Identical starting materials and the same initial concentrations were used in each preparation. The rates of gold(III) redu…
Poly(vinyl alcohol) (PVA) and poly(methyl methacrylate) (PMMA) were assembled from NaCl-containing aqueous and organic solutions, respectively, by their stepwise physical adsorption onto a quartz crystal microbalance (QCM) substrate, which enabled the quantitative analysis of the assembly process. The layer-by-layer (…