Materials Literature
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Esta pesquisa foi desenvolvida com o objetivo de avaliar a viabilidade de utilização da madeira de Eucalyptus maculata, E. grandis e E. tereticornis, na forma de resíduos de processamento em serrarias, para produção de painéis de madeira aglomerada. Foram produzidos 24 painéis, para um total de oito tratamentos defini…
Biologically Active Polymers Polymeric Matrices Liposomes Interactions between Polymeric Drug Delivery Systems and Biological Systems: Barriers and Opportunities PGG-Glucans: A Novel Class of Macrophage-Activating Immunomodulators A New *b-Glucan-Based Macrophage-Targeted Adjuvant Fluorescent Labeling of Heparins and…
Chlorins provide the basis for plant photosynthesis, but synthetic model systems have generally\nemployed porphyrins as surrogates due to the unavailability of suitable chlorin building blocks.\nWe have adapted a route pioneered by Battersby to gain access to chlorins that bear two meso\nsubstituents, a geminal dimeth…
The synthesis, X-ray structure, and NMR ( 1 H, 13 C, 17 O) and magnetic characterization of the complexes [Co(CO) 2 (tmpo)] ( 1 ) and [Co 4 O(OOCNC 9 H 18 ) 6 ] ( 2 ) are reported. Reaction of Co 2 (CO) 8 in the presence of a 4-fold excess of tmpo yields in a few minutes the blue carbamato complex 2 in >80% yield. The…
Chronoamperometry has been undertaken at insonated electrodes of both micro and macro dimensions, for a range of simple, well-defined redox couples in water (298 K), DMF (298 and 218 K), and ammonia (218 K) as solvents. These are analyzed to assess the relative contributions of acoustic streaming and cavitational acti…
An efficient and versatile synthesis of a series of polymerizable amphiphilic mesogens that affords control over tail length and position of the polymerizable group is described. The synthesis employs a novel and facile method of preparing styrene ethers. The monomers are sodium salts of styrene ether-modified fatty a…
Two novel blue luminescent bridging ligands N,N,N',N'-tetra(2-pyridyl)-1,4-phenylenediamine (tppd) and N,N,N',N'-tetra(2-pyridyl)-1,1-biphenyl-4,4'-diamine (tpbpd) have been synthesized. Several novel lanthanide complexes containing 2,2',2"-tripyridylamine (2,2',2"-tpa), 2,2',3"-tpa, tppd, or tpbpd ligands have been s…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnolization and Aldol Reactions of Ketone with a La3+-Immobilized Organic Solid in Water. A Microporous Enolase MimicTakehisa Dewa, Toshiyuki Saiki, and Yasuhiro AoyamaView Author Information CREST, Japan Science and Technology Corporation (JST) and Institute for Funda…
The Class I and III polyhydroxybutyrate (PHB) synthases from Ralstonia eutropha and Chromatium vinosum, respectively, catalyze the polymerization of beta-hydroxybutyryl-coenzyme A (HBCoA) to generate PHB. These synthases have different molecular weights, subunit composition, and kinetic properties. Recent studies with…
Oxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of ${\mathrm{La}}_{0.75}{\mathrm{Ca}}_{0.25}{\mathrm{MnO}}_{3}$ and ${\mathrm{Nd}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}.$ We found that the residual resistivity ${\ensuremath{\rho}}_{o}$ increases by about…
ADVERTISEMENT RETURN TO ISSUEPREVNoteMolecular Weight Dependence of Alternate Adsorption through Charge-Transfer InteractionYuzuru Shimazaki, Ryo Nakamura, Shinzaburo Ito, and Masahide YamamotoView Author Information Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo, Kyoto 606-85…
The effects of Cr substitution on Mn sites in the colossal magnetoresistance (CMR) compound ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ have been studied by preparing the series ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{3} (x<~0.3).$ A c…
Electronic transport in gold−dithiol nanoparticle films was studied using conductivity, photoconductivity, and photoelectrochemical means. The films were characterized by SEM and optical spectroscopy. GC/MS was used for the analysis of the pyrolysis products during heat treatment. Films were assembled on glass substra…
The behaviour of the Random Anisotropy Ising model at T=0 under local relaxation dynamics is studied. The model includes a dominant ferromagnetic interaction and assumes an infinite anisotropy at each site along local anisotropy axes which are randomly aligned. Two different random distributions of anisotropy axes hav…
We report a detailed experimental and theoretical investigation of the effect of residual strain and strain relaxation, which manifests itself at the ${\mathrm{S}\mathrm{i}/\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$ interfaces in commercial silicon-on-insulator (SOI) wafers. SOI material is made of a single-crystal silicon…
The ability to create thin films of highly oriented anisotropic nanoparticles of transition metal oxides onto polycrystalline and single-crystalline substrates is demonstrated by the fabrication of large three-dimensional arrays of perpendicularly oriented nanorods of crystalline iron(III) oxides onto tin oxide and sa…
A new application of MCM-41 mesoporous materials has been developed. Two kinds of surfactants, C16TAB and C12TAB, have been employed to get different pore sizes. The samples were disk-shaped conformed before and after charging with ibuprofen, an anti-inflammatory drug. In all the cases the weight percent ratio of drug…
Earthmoving, mining, and minerals processing each involve frequent, and often severe, mechanical interactions between metals, and between metals and abrasive nonmetallic and metallic materials (i.e., mineral bearing ores). The abrasive nature of ores causes significant wear to extracting, handling, and processing equi…
A thorough understanding and analysis of geometry and topology of three-dimensional fiber networks from high resolution images is an important and challenging task due to the enormous complexity and randomness of the structure. In this paper we propose a technique that is aimed at structural analysis of fiber mats, bo…
Earthmoving, mining, and minerals processing each involve frequent, and often severe, mechanical interactions between metals, and between metals and abrasive nonmetallic and metallic materials (i.e., mineral bearing ores). The abrasive nature of ores causes significant wear to extracting, handling, and processing equi…