Materials Literature
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The paper presents a comparative study in which different kinetic models were applied to describe the reaction kinetics of a mixture of sugar cane straw with 20 and 30% of clay, burned at 800 and 1000°C (SCSCA), and hydrated lime [calcium hydroxide (CH)]. Classical models, such as the Jander, Jander Modified and Zurav…
Poly(epsilon-caprolactone) (PCL) fibers produced by wet spinning from solutions in acetone under lowshear (gravity-flow) conditions resulted in fiber strength of 8 MPa and stiffness of 0.08 Gpa. Cold drawing to an extension of 500% resulted in an increase in fiber strength to 43 MPa and stiffness to 0.3 GPa. The growt…
A novel sol-gel-derived preceramic polymer, namely poly(organosilyl)carbodiimide, was synthesized for fabrication of thermally stable amorphous Si-C-N membranes. The gelation process as well as the viscosity of the poly(organosilyl)carbodiimide was adjusted for spin coating by reacting a mixture of alkyl and dialkyl c…
Abstract—Electromagnetic Scattering problem by multiple metama-terial cylinders are studied. A formulation for coating conducting cylin-ders by metamaterial is presented. The formulation is based on the ex-pansion of electromagnetic fields by Bessel functions in local cylindrical coordinates and then transformation fr…
Polymeric conjugates based on N-(2-hydroxypropyl)methacrylamide (HPMA) have been tested as potential carrier for anticancer drug - doxorubicin (Dox). Two types of conjugates were synthesized: (a) conjugates containing Dox bound through an amidic bond to an oligopeptidic side-chain (usually GFLG) and (b) hydrolytically…
Observation of the synergic gelation effect (SGE) in two-component gels is reported. An equimolar mixture of (S,S)-bis(LeuOH) oxalamide [(S,S)-1] and (S,S)-bis(leucinol) oxalamide [(S,S)-2] is able to gel up to 7 times larger a volume of p-xylene than an equal mass of each component and up to 5 times larger a volume t…
Fluorescence intensity from single walled carbon nanotubes in aqueous sodium dodecylsulfate solution is shown to be strongly temperature dependent in the range 5-60 degrees C. Emission peaks corresponding to particular nanotube species which have been quenched due to oxidation by aerated water show sharp transitions a…
To ensure the high quality of ultra-precision products such as semiconductors and optical microscopes, high-tech equipment used to make these products requires a normal working environment with extremely limited vibration. Some of high-tech industry centres are also located in seismic zones: the safety of high-tech eq…
This study examined the effect of addition on grain-boundary conductivity in -doped containing as an impurity. The addition of increased the grain-boundary conductivity times without affecting the grain-interior conductivity significantly. was incorporated into the lattice completely, which means that a scavenging rea…
The reaction of the pentadentate Schiff-base ligand 1,3-bis(salicylideneamino)-2-propanol (salproH3) with [Mn3O(O2CR)6(py)3] (R = Me, Et, But) gives the corresponding tetranuclear manganese product [Mn4O2O2CR)5(salpro)] (4Mn(III)). The syntheses, structure and magnetochemical characterization of these complexes are re…
A tripodal amido ligand with a central non-chelating phosphorus donor allows for the facile assembly of a pentane soluble organometallic copper cluster with a central copper atom surrounded by a nonplanar chain of eight copper atoms and two terminal amido-copper bonds.
A novel synergist immobilization photo-graft polymerization method has been developed to functionalize polymer materials in polar organic solutions. This two-step method, based on the immobilization of tertiary amine groups as synergists for the photoinitiator benzophenone (BP), had been evaluated for commercial hydro…
Recently we have developed the stereo-array isotope labeling (SAIL) technique to overcome the conventional molecular size limitation in NMR protein structure determination by employing complete stereo- and regiospecific patterns of stable isotopes. SAIL sharpens signals and simplifies spectra without the loss of requi…
We have synthesized poly(3-hexylthiophene) (P3HT) from initiator monolayers covalently bound to TiO2 nanotubes fabricated inside nanoscale porous aluminum oxide templates. Much larger density of P3HT is achieved than by infiltration of the pores with P3HT synthesized outside the template. In addition, much lower photo…
Three-dimensional (3D) morphology of a polymer/clay nanocomposite, an organophilic montmorillonite (MMT) dispersed in poly(ethylene-co-vinylacetate) (EVA), was examined by transmission electron microtomography (TEMT). Using this technique, individual clay layers dispersed in the EVA matrix were clearly visualized. A v…
The electronic structure of CaCu3Mn4O12 and LaCu3Mn4O12 was investigated using a full-potential linearized augmented plane wave method within the Generalized Gradient Approximation (GGA). The ferrimagnetic and ferromagnetic states in these two compounds were investigated and the calculated spin magnetic moments were f…
A series of meso-to-meso ethynyl-bridged multiporphyrin arrays have been synthesized using Sonogoshira palladium-catalyzed cross-coupling reactions involving the appropriate ethynylporphyrin and iodoporphyrin precursors. The absorption spectra of these multiporphyrins show splitting of the Soret bands and significant…
We describe the operation of a light-emitting device in which silicon nanocrystals are electrically pumped via the field-effect electroluminescence (EL) mechanism. In contrast to the simultaneous bipolar carrier injection used in conventional p-n junction light-emitting diodes, this device employs sequential unipolar…
A compartmentalized {4 x[2 x 2]} Mn(II)16 antiferromagnetically coupled square grid results from the self-assembly reaction of a tetratopic pyridazine bis(hydrazone) ligand and Mn(II).
This paper focuses on the effects of the interface between epoxy resin and nano- or micro-scale silica filler. Experiments were carried out on epoxy resin containing nano- or micro-scale silica fillers (nano-composite or micro-composite) to investigate the effects of the epoxy/filler interface on the properties of wat…