Materials Literature
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Silicon (Si) quantum dot (QD) superlattice structures are promising candidates for all-Silicon tandem solar cells. An original top-down process involving a bio-template etching mask and damage-free neutral beam etching has been developed in order to fabricate a sub-10-nm highly ordered and dense two-dimensional (2D) a…
In this paper, a problem of the stress-strain diagram approximation at elastic and plastic deformation is considered and the interrelation of conditional and true diagrams for hardened and non-hardened metals is established.
High intensity focused ultrasound (HIFU) has been used in clinical treatment for a variety of diseases, and achieved good results. Former related researches are mostly focused on either consecutive HIFU or HIFU with a low duty cycle, which is similar to the damage caused by consecutive HIFU mainly through thermal effe…
Different mesoporous titanias synthesized by hydrolysis and polycondensation reactions of tetrabutyl titanate with various hydrolysis ratios (H2O/Ti by mole) were employed as supports for zirconocene/MAO catalysts in ethylene/1-olefin copolymerization. The pure anatase phase of titania was detected by X-ray diffractio…
A utilização de madeiras para fins estruturais sofre o efeito tanto do teor de umidade quanto da massa específica. Num mesmo lote de madeira há peças com diferentes teores de umidade e massas específicas. Para o seu uso estrutural com segurança, é necessário estimar a resistência e a rigidez considerando essa variação…
The present study is aimed at improving the dissolution of poorly soluble drug, rofecoxib, using solid dispersion technique. The solid dispersions were prepared in different proportions using hydrophilic carriers like mannitol, and urea. The dissolution rate studies were performed in both simulated gastric fluid and s…
[ES] Los líquidos iónicos son alternativas razonables a los electrolitos utilizados en dispositivos de almacenamiento de energía, como las baterías de litio, pues ofrecen importantes ventajas en materia de seguridad. Esto se debe a las favorables propiedades de muchos de ellos, principalmente no-inflamabilidad y no-vo…
In this study, we demonstrate the use of discrete dipole approximation (DDA) approach to estimate the influenced of low order surface vacancies on the localized surface plasmon resonance that is in the range of di-to squarevacancy. Gold rectangular nanoprism was chosen as a model for the simulation due to its recent u…
The slurry polymerization of ethylene was studied by employing a (TiCl4/Mg(OEt)2/TEA) catalyst system in hexane. The effects of triethylaluminum concentration and temperature on polymer yield and polymer viscosity average molecular weight, Mv, were investigated. The maximum polymer yield was obtained at an Al/Ti molar…
Paper/plastic/aluminum (PPA) multilayer composite is one of the most favorable packaging material for milk and yoghourt because of its excellent material properties, especially the unbreakability, machinability and barrier properties towards moisture, oxygen and light. Ecological demands on littering and on carbon foo…
Unique mixed PtPd shelled PtPdCu alloy nanoparticle nanotubes (ANNTs) are synthesized by galvanic displacement with partial sacrificial copper nanowire templates, following electrochemical leaching of non-noble metal Cu in acidic electrolyte, as reported by Shu-Hong Yu and co-workers on page 1182. These core/shell cat…
Conformational changes of proteins and their affinity noncovalent interactions with other molecules play a key role in facilitating and regulating biological functions of living systems. Protein dy...
Optical trapping and manipulation of metallic nanoparticles are experimentally demonstrated using two types of cylindrical vector beams, radially and azimuthally polarized beams. The transverse optical trapping stiffness of gold nanoparticles is measured. The radially polarized beam exhibits a higher trapping efficien…
Low-molecular-weight butadiene and styrene polymers with narrow molecular-weight distribution were prepared by the mechanism of living polymerization with front initiation. Introduction of deactivating nitrogen-containing agents (α-pyrrolidone, N-methylpyrrolildone, caprolactam, urea) into living polymer chains allows…
WO3 nanocrystals have been successfully synthesized via an ion induced auxiliary hydrothermal method. The experiment products were characterized by powder X-ray diffraction (XRD) and the Photocatalytic oxidation performance of products were characterized by using the photocatalytic oxidation of methyl orange under the…
According to the interaction between lamellar inclusion and interphase, forth-phase model is suggested to determine the micro-stress-field distribution of three-phase cell in eutectic composite ceramic. On the basis of the volumetric average strain, the effective compliance tensor increment of eutectic composite ceram…
Nanotechnology is emerging as a key, transformative technology of the 21st Century. With its great uncertainty, nanotechnology indicates potentially high risk. Drawing on the idea of “governance”, which stresses the participation of all stakeholders, this paper depicts the current nanotechnology development in mainlan…
Piezoelectric lead zirconate titanate (PZT) thick films were prepared on flat and curved substrates by electrophoretic deposition (EPD) process. PZT and PbO particles were dispersed in ethanol to obtain a stable suspension and deposited on flat alumina at constant current density of 1.56 mA/cm2for 90 seconds and on cu…
Nowadays, polyimides, polestherimides and polyamide-imides are widely used in electrical machines winding insulation. However, the manufacturing process of these classical enameled wires is expensive and very polluting. The polymerization of the insulating layers (20 passes) is obtained by the combined action of heat…
A piezoelectric plate with a damper and a matching layer is considered. Water was chosen as an acoustic load. On the basis of the use of the apparatus of circuits-analogues of piezoelectric transducers (PETs), the relationships were obtained that determine the frequency dependences of the modulus and phase of the inpu…