Materials Literature
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At present about 40% of the drugs being in the development pipelines are poorly soluble, even up to 60% of compounds coming directly from synthesis are poorly soluble [1]. Poor solubility is in most cases associated with poor bioavailability. According to the Noyes-Whitney law the dissolution velocity dc/dt depends on…
An Eulerian/Lagrangian computational procedure was developed for the prediction of cavitation inception by event rate. The carrier-phase flow field was computed using an Eulerian Reynolds-averaged Navier-Stokes (RANS) solver. The Lagrangian analysis was one-way coupled to the RANS solution, since at inception, the con…
The origin of oriented recrystallization behavior of vacuum carbon evaporated preoriented polymer thin films was studied by means of transmission electron microscopy and electron diffraction with elaborately designed experimental setups. Through the recrystallization of HDPE in the iPP/HDPE-C sandwich layers with its…
Tb2O3 nanotubes were fabricated by calcination of the precursor Tb(OH)3 nanotubes prepared by a template-assisted hydrothermal route. The oxide nanotubes have outer diameters ranging from 80 to 100 nm, wall thickness of about 30 nm, and lengths up to several micrometers. The optical absorption spectrum shifted to high…
Copolymers of poly[N,N′-(1,4-phenylene)-3,3′4,4′-benzophenonetetra-carboxylic amic acid] (PAmA) with grafted poly(methylmethacrylate) (PMMA) and poly(acryamide) (PAAM) side chains (PMMA-g-PAmA and PAAM-g-PAmA, respectively) were synthesized by thermally-induced graft copolymerization of methylmethacrylate (MMA) and ac…
Two polymorphic cyano-bridged Au(I)-Ni(II) bimetallic complexes of formulas [Ni(en)2Au(CN)2][Au(CN)2] (1) and [Ni(en)2[Au(CN)2]2] (2) have been prepared from the 1:2 reaction between [Au(CN)2]- and either [Ni(en)2Cl2]Cl or [Ni(en)3]Cl2.2H2O, respectively. The structure of 1 consists of polymeric cationic chains of alt…
Com o objetivo de avaliar a relação da composição mineralógica e química do solo com a estabilidade de agregados do tamanho de silte, foram realizados estudos utilizando-se amostras de horizontes A e B de diversos solos da Região Sudeste do Brasil. Amostras de TFSA foram dispersas a 12.000 rpm por 20 minutos e a fraçã…
A method to produce a substrate suitable for surface-enhanced Raman study on the pure massive Rh electrode was developed. The surface-enhanced Raman scattering (SERS) active Rh electrode with good stability, reversibility, and ease of preparation can be obtained by the control-current electrochemical roughening method…
We couple a morphological study of a mixture of diblock copolymers and rod-like, solid nanoparticles with a micromechanical simulation to determine how the spatial distribution and aspect ratio of the particles affects the mechanical behavior of the composite. The morphological studies are conducted through the SCF/DF…
A new triterpenoid, 2beta,3beta,19alpha,24-tetrahydroxy-23-norurs-12-en-28-oic acid (4), together with three known triterpenoids 3-oxo-19alpha,23,24-trihydroxyurs-12-en-28-oic acid (1), 2alpha,3beta,19alpha,23-tetrahydroxyurs-12-en-28-oic acid (2), 2alpha,3alpha,19alpha,23-tetrahydroxyurs-12-en-28-oic acid (3), was is…
Reduction of silver nitrate in polyol/toluene biphasic medium containing dodecanethiol led to organised silver nanowires, results of an interaction between silver nanoparticles and the layered phase AgSC12H25.
A conductive transparent electrode is used to observe and quantify the nucleation-growth process of scale deposition. The CaCO 3 deposition is accelerated by increasing the interfacial pH induced by an electrochemical reaction on the electrode surface. Three measurements were simultaneously obtained with respect to ti…
A new electric double layer capacitor (EDLC) was constructed by using polymer hydrogel electrolyte prepared from cross-linked potassium poly(acrylate) and a KOH aqueous solution. The electrochemical characteristics of the EDLC cell were investigated by cyclic voltammetry and charge/discharge cycle testing compared wit…
Macroporous gold spheres with a diameter of ∼9 µm have been formed by a facile method, employing porous organic bead templates and preformed gold nanoparticles.
Nickel stearate was used as a chemical template and metal source for the easy-and-fast preparation of Ni/Al2O3 catalyst with a mesoporous structure. Ni-Nx and Ni-Hx were prepared using an NH4OH-treated precipitate and a HCl-treated solution as the chemical template, respectively, and these materials show only the effe…
Abstract Bi 8 (SeO 3 ) 9 Br 6 wurde auf der Basis thermodynamischer Berechnungen aus BiOBr und SeO 2 über eine Autotransportreaktion im Temperaturgradienten von 670 nach 660 K synthetisiert. Kristalle von CsSm 21 (SeO 3 ) 24 Br 16 entstanden aus der Umsetzung äquimolarer Gemenge von SmOBr und SeO 2 im CsBr‐Flux bei 10…
Vanadium oxide ( VO x ) nanotubes, with embedded Na + , K + , or Ca 2 + -ions, were synthesized and investigated structurally and electrochemically in a Li-battery context. The nanotubes consist of scroll-like layers of vanadium oxide separated by structure-directing primary amines or metal cations. X-ray diffract…
The corrosion behavior of heat resistant ferritic steels for boiler tubes in a steam/air dual environment simulating the non heated areas at 600°C has been investigated. Corrosion rates of the ferritic steels on the air sides under a condition of steam/air dual environments were increased more significantly than those…
Recent developments ofpolymer nanocomposites were reviewed in terms Offobrlcotlon, mechonlcal ond barrier properties, thermal stobiiity, flame retardoncy and otherfundionol properties. PolymerlC/oy nonocomposltes can befabricated through In situ polymerlsatlon, solution blending, and melt compounding. The high asped r…
The effect of the simultaneous partial substitution of Co2+ for Fe3+ and of La3+ for Sr2+ ion in Sr ferrite on the magnetic properties of anisotropic Sr ferrite magnets was investigated. It was found that the coercive force iHc of Sr ferrite magnets is increased without significant decrease in residual flux density Br…