Materials Literature
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We demonstrate the image conversion from mid-IR to near-IR (NIR) exploiting high-contrast optical switching in vanadium oxide thin-film layers. The intensity distribution of a mid-IR beam is converted to NIR wavelengths exploiting the strong reflectivity changes induced by optical pumping in the mid-IR. We show an exp…
BACKGROUND: Emulsified perfluorocarbons (PFCs) are preferentially phagocytized by monocytes/macrophages and are readily detected by (19)F MRI. This study tests the hypothesis that (19)F MRI can be used to quantitate pulmonary inflammation by tracking of infiltrating PFC-loaded monocytes. METHODS AND RESULTS: Pneumonia…
The isolation of cellulose from different lignocellulosic biomass sources such as corn cob, banana plant, cotton stalk, and cotton gin waste, was studied using a steam explosion technology as a pre-treatment process for different times followed by alkaline peroxide bleaching. The agricultural residues were steam-explo…
Abstract Iron‐based core‐shell nanoparticles can present interesting catalytic properties for the growth of carbon nanostructures. We report the synthesis of various carbon nanostructures using activated chemical vapour deposition methods. These structures were analysed by Scanning Electon Microscopy (SEM) and Raman s…
Based on the analysis of rectangular periodic structures, the resonance frequency band is found to be shifted and broadened from low frequency to high frequency by adjustment of the corresponding structure size. Computer simulation shows that a miniature split-ring resonator can enhance and broaden resonance frequency…
In this work, we introduce the on-substrate preparation and characterization of ultra highly densely packed sub-micrometer carbon of perfect sphericity and well-connecting to each other forming chainlike compounds. These carbon sub-microsphere (CSMS) chains are highly pure with no catalyst remaining encapsulated withi…
Abstract The kinetics of the photodissolution of Ag into glassy As2S3 films and its dependence on temperature have been studied by monitoring the changes that occur both in their transmission spectra and transmission of weakly absorbed broadband light. It was shown that besides of a low induction period, the photodiss…
We propose a novel parametric approach which aims at the synthesis of anisotropic solid textures from the analysis of a single 2D exemplar. This approach is an extension of the pyramidal scheme of Portilla and Simoncelli. It proceeds in three main steps: first, a 2D analysis of the example is performed which produces…
No dominio das construcoes sustentaveis, a madeira laminada colada (MLC) ocupa um lugar proeminente, sobretudo pela possibilidade de emprego de madeiras provenientes de florestas plantadas. Como consequencia da pequena tradicao no seu uso, do elevado custo dos adesivos e do reduzido numero de empresas envolvidas em su…
Purpose The purpose of this paper is to study the inhibitory activity of benzene‐1,2,4,5‐tetracarboxylic dianhydride (PMDH) on aluminium corrosion in hydrochloric acid 1 M HCl. Design/methodology/approach The inhibitive effect of PMDH towards the corrosion of aluminium in 1 M HCl solution is studied by means of electr…
A gene encoding an L-lysine dehydrogenase was identified in the hyperthermophilic archaeon Pyrococcus horikoshii. The gene was overexpressed in Escherichia coli, and its product was purified and characterized. The expressed enzyme is the most thermostable L-lysine dehydrogenase yet described, with a half-life of 180 m…
The selective reflection band structure of a mixture composed of azo-nematics and cholesteric liquid crystal (azo-based CLC) is investigated as an effective single optical medium. Berreman's 4×4 matrix method is adopted to analyze the photoisomerization-induced changes in the azo-based CLC by identifying the effective…
Long molecular ligands or "tethers" play an important role in the self-assembly of many nanoscale systems. These tethers, whose only interaction may be a hard-core repulsion, contribute significantly to the free energy of the system because of their large conformational entropy. Here, we investigate how simple approxi…
Published diffusion prediction models for the diffusion of additives in food packaging simplify reality by having a small number of parameters only. Therefore, extrapolation of such models to barrier polymers, larger ranges of temperature and/or additive molecular weight (M(W)) is questionable. Extra data is still req…
Single crystals of syndiotactic poly(propene- co -1-butene) with 1-butene as the rich component have been obtained through ultrathin film growth from the melts. The morphological and structural studies on these single crystals have disclosed the influence of propene units on the crystallization behavior of syndiotacti…
Interface reactions in composite systems often determine their overall properties, since product phases usually formed at interfaces during composite fabrication processing make up a large portion of the composites. Since most composite materials represent a ternary or higher order materials system, many studies have…
Abstract This work presents the results of investigations of the electromagnetic shielding efficiency of composite materials (CMs) based on epoxy resin and thermoexfoliated graphite (TEG). The measurements were performed in the wide region of electromagnetic radiation (EMR) frequency from 25.5 to 77.5 GHz. It was show…
Internal dynamics of dansylated poly(propyleneamine) dendrimers (POPAM, G1-G4) in solution and excitation energy transfer from dansyls to eosin in POPAM-eosin complexes have been studied by time-resolved fluorescence spectroscopy and molecular dynamics (MD) simulations. Combining the results from fluorescence anisotro…
We present coarse-grained molecular dynamics simulations of poly(ethylene-alt-propylene) (PEP) melts, ranging in chain length from about N(e) (the entanglement length) to N=6N(e). The coarse-grained parameters, potential of mean force and bare friction, were determined from fully atomistic molecular dynamics simulatio…
We report that a simple fabrication of a superhydrophobic nanosurface consisted of a grass-like silica thin film on the inner wall of a glass tube and its feature in water motion and water movement. The glass tube with a superhydrophobic inner wall can make the water flow with friction-drag reduction and completely pr…