Materials Literature
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A signal loss is generally reported in electron probe microanalysis (EPMA) of porous, highly divided materials like heterogeneous catalysts. The hypothesis generally proposed to explain this signal loss refers to porosity, roughness, energy losses at interfaces, or charging effects. In this work we investigate by Mont…
A re-investigation of the chemical constituents of the stem bark of Symplocos racemosa Roxb. led to the isolation of four new glycosides, symplocomoside (1), symponoside (2), symplososide (3) and symploveroside (4). Benzoylsalireposide (5) and salireposide (6) were re-isolated from this plant. The structures of the ne…
As predicted at the B3LYP/LANL2MB level of theory, the adsorption of tetraaza[14]annulene ligands (simple analogues of porphyrins and phthalocyanines) on single-walled carbon nanotubes is insignificantly influenced by the presence of aliphatic (methyl) or/and aromatic (benzo) substituents on the macrocyclic molecules.…
The mechanism, microstructure and mechanical properties of transient liquid phase (TLP) bonded magnesium alloy (Mg – 3Al – 1Zn) joints using copper interlayers in an argon atmosphere have been investigated. The formation process of the TLP joint comprises a number of stages: plastic deformation and solid state diffusi…
The goal of this article is first to review the charging effects occurring when an insulating material is subjected to electron irradiation in a scanning electron microscope (SEM) and next their consequences from both scanning electron microscopy and electron probe microanalysis (EPMA) points of view. When bare insula…
Inactivation of Escherichia coli O157:H7 suspended in salt solutions (Na(2)PO(4), NaCl, NaNO(3), NH(4)Cl, CaCl(2), and AlCl(3)) at concentrations ranging from 0 to 5% (w/v) by high-intensity ultrasound at two different temperature conditions (ice water bath, 40 degrees C water bath) and three ultrasonic intensity leve…
Two new phloroglucinol glycosides, lysidisides A and B, and two new flavanol ramifycations, lysidicichin and mopanolside, together with (+)-mopanol, polydatin and E -resveratrol 3- O - β - D -xylopyranoside were isolated from the EtOAc extract of the roots of Lysidice rhodostega . The structures of the new compounds w…
Abstract Initial stages of the gel-to-kaolinite transformation were studied using HRTEM. Spherical aggregates of kaolinite crystals were produced during the synthesis of kaolinite by hydrothermal treatment of Si-Al amorphous gels. Prior to sphere formation, gels transform into pseudospherical domains that have a Si/Al…
CaTi 0.8 Fe 0.2 O 3–δ ceramics with grain sizes that varied from 2 to 10 μm were obtained and studied using SEM, TEM, Mössbauer spectroscopy, impedance spectroscopy, and electrochemical oxygen permeability measurements. Smaller grains developed a core–shell microstructure that consisted of a pure CaTiO 3 core and an i…
The initiation and propagation of adiabatic shear bands (ASBs) in functionally graded materials (FGMs) deformed at high strain rates in plane-strain tension have been studied. An ASB is a narrow region, usually a few micrometers wide, of intense plastic deformation that forms after softening of the material due to its…
The recently developed Hartree analysis for compressible diblock copolymers has been performed to study the thermodynamic origin of an immiscibility loop and its unprecedented pressure dependence observed in a diblock copolymer from polystyrene and poly( n -pentyl methacrylate). Certain specific interactions (SI) were…
This article revises, analyses, completes and summarizes the crystalline structure of all the Y2Si2O7 and Y2SiO5 polymorphs by combination of diffraction and crystallographic data with spectroscopic MAS-NMR data published up to now.
A new amine-modified hypercrosslinked polymeric resin, AH-6, for the removal of phenolic compounds from their aqueous solutions was prepared by introducing dimethylamine groups onto the matrix of the conventional hypercrosslinked polymeric adsorbent NDA100. The adsorption of four phenolic compounds, i.e. phenol, p-cre…
Core−shell colloids, particles covered with polyelectrolyte (PE) multilayer films and lipid bilayer membranes, were prepared through self-assembly processes. The PE multilayer films were fabricated by the layer-by-layer (LbL) assembly of poly(diallyldimethylammonium chloride) (PDDA) and poly(sodium 4-styrenesulfonate)…
n -Propylsulfonic acid-functionalized porous and nonporous silica materials are evaluated in the ring-opening polymerization of ε-caprolactone. All catalysts allow for the controlled polymerization of the monomer, producing polymers with controlled molecular weights and narrow polydispersities. Polymerization rates ar…
Ferroelectric Ba(Sn x Ti 1− x )O 3 (BTS) thin films were deposited using a sol–gel process on LaNiO 3 ‐coated silicon substrates. The films showed a (100) preferred orientation depending on composition. The grain size decreased and the microstructure became denser with increasing tin content. The decreasing grain size…
On the basis of hydrogen bonding, poly(vinylpyrrolidone) and poly(methacrylic acid) were layer-by-layer deposited on the surface of the AgCl microcrystals or SiO 2 colloidal particles in aqueous solution to construct core−shell structure particles. When the AgCl and SiO 2 cores were removed, the porous and nonporous n…
Molecular biology and genomic sciences are revealing the early biological signatures for many diseases. In response, the Molecular Imaging community is rapidly developing contrast agents to visualize the nascent pathological changes and to concomitantly deliver treatment directly to the site of disease. The evaluation…
The thermodynamic functions free energy, enthalpy, and entropy of solution, were evaluated from the solubility data of acetanilide, acetaminophen, and phenacetin, determined at several temperatures in water, octanol, isopropyl myristate, and chloroform. These three organic solvents mutually saturated with water, and f…
An economic method is presented to grow undoped/doped tungsten oxide nanowires with high purity and erect orientation, simply by heating a tungsten filament in a vacuum chamber with some room air leakage. Tungsten oxide nanowires were studied using scanning electron microscopy (SEM), energy dispersion x-ray spectrosco…