Materials Literature
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Abstract Aiming to improve the homogeneity of films based on chitosan to be applied as edible coating, we carried out some chemical modifications in the polymeric structure by reductive alkylation and quaternization reactions. The resulting derivatives had different hydrophilic behaviours and cast films were character…
The origin of the unique geometry for nitric oxide (NO) adsorption on Pd(111) and Pt(111) surfaces as well as the effect of temperature were studied by density functional theory calculations and ab initio molecular dynamics at finite temperature. We found that at low coverage, the adsorption geometry is determined by…
We study nonlinear, two-dimensional convection in a mushy layer during solidification of a binary mixture. We consider a particular limit in which the onset of oscillatory convection just precedes the onset of steady overturning convection, at a prescribed aspect ratio of convection patterns. This asymptotic limit all…
The treatment of HfCl(4) with NaL(OEt) (L(OEt)(-) = [(eta(5)-C(5)H(5))Co{P(O)(OEt)(2)}(3)](-)) in nitric acid afforded L(OEt)Hf(NO(3))(3) (1). Hydrolysis of 1 in acetone/water (4:1, v/v) yielded the hydroxy-bridged dimer [(L(OEt))(2)Hf(2)(H(2)O)(4)(mu-OH)(2)][NO(3)](4) (2). The treatment of (NH(4))(2)[Ce(NO(3))(6)] wi…
We have designed new double stimuli-responsive polyelectrolyte microcapsules to be useable under physiological conditions to handle biomacromolecules while avoiding the risk of denaturation. They are made of poly(4-vinylpyridine hydrochloride) (PVP) and poly(sodium styrene sulfonate) (PSS). The microcontainers are sen…
Results are presented for the electron current in gold chiral nanotubes (AuNTs). Starting from the band structure of (4,3) and (5,3) AuNTs, we find that the magnitude of the chiral currents are greater than those found in carbon nanotubes. We also calculate the associated magnetic flux inside the tubes and find this t…
Wurtzite-type ZnS : Mn 2+ nanowires were prepared by a hydrothermal method at 180 °C without any surface-active agent. The structure and morphology of the samples were characterized by x-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, Fourier transform infrared spec…
We have quantitatively analyzed the confocal spectra of colloidal quantum dots (QDs) in rat endothelial progenitor cells (EPCs) by using Leica TCS SP5 Confocal Microscopy System. Comparison of the confocal spectra of QDs located inside and outside EPCs revealed that the interaction between the QDs and EPCs effectively…
Abstract Morphological, mechanical, and rheological properties of poly(butylene terephthalate) (PBT)/glass fiber (GF) composites and their fiber lengths after extrusion were studied, along with the molecular weight of PBT and the sizing effect of the fiber. From the molecular weight effect of PBT on mechanical propert…
Multifunctional nanocarriers for amino functional targets with a high density of accessible binding sites are obtained in a single polymerization step by grafting from copolymerization of an active ester monomer from superparamagnetic cores. As a result of the brush-like structure of the highly dispersed shell, the na…
Electrospun syndiotactic polystyrene (sPS) fibers with a diameter of 150−400 nm were successfully prepared via high-temperature electrospinning of solutions with different concentrations in an o -dichlorobenzene solvent. From the polarized FTIR spectra, the sPS chains in the as-spun fibers were amorphous and exhibited…
We present first-principles calculations of x-ray absorption spectra of graphene and hexagonal BN monolayer on the Ni(111) substrate. Including dynamical core-hole screening effects according to the theory of Mahan--Nozi\`eres--de Dominics (MND) results in an overall good agreement with previously published experiment…
An axially symmetric twisted nematic liquid crystal (ASTNLC) device, based on axially symmetric photoalignment, was demonstrated. Such an ASTNLC device can convert axial (azimuthal) to azimuthal (axial) polarization. The optical properties of the ASTNLC device are analyzed and found to agree with simulation results. T…
Water-based ferrofluids (magnetic fluids) with double-layer steric stabilization by short monocarboxylic acids (lauric and myristic acids) are considered to be a potential source of magnetic nanoparticles in brain cancer (glioblastoma) treatment. Structure characterization in the absence of an external magnetic field…
We report on the solubility of hen lysozyme (HEWL) in aqueous ethylammonium nitrate (EAN) as a function of water content. We find the solubility behavior to be complex, exhibiting both a maximum (400 mg/mL) at very high EAN content) and a minimum at intermediate EAN content. We exploit this solubility profile in a nov…
Silver nanoparticles were synthesized and stabilized by a simple, environment-friendly method in a liposomes structure. Liposomes were prepared by facing lecithin to the aqueous-phase solutions while stirring vigorously. The ratio of lecithin concentration to silver nitrate (K(Lec/Ag) = [Lecithin]/[AgNO(3)]) is the in…
We study a model of phase segregation of the Allen–Cahn type, consisting in a system of two differential equations, one partial and the other ordinary, respectively interpreted as balances of microforces and microenergy; the two unknowns are the order parameter entering the standard A–C equation and the chemical poten…
Abstract Rheological properties of fiber/polymer suspensions and dynamic mechanical analysis (DMA) of paper sheets containing the same polymers were measured. Correlations between viscoelastic properties of suspensions and strength of paper sheet are presented. Rheological properties of suspensions of microfibrillar c…
The cubic phase of boron nitride (c-BN) is an extremely promising multifunctional material. However, to exploit all possible applications, large area chemical vapor deposition (CVD) of c-BN films is required. For a successful CVD growth of high-quality c-BN films one must obtain a deeper understanding about the struct…
The electrical resistance of mats of single-wall carbon nanotubes (SWNTs) is measured as a function of mat temperature under various helium pressures, in vacuum and in atmospheric air. The objective of this paper is to study the thermal stability of SWNTs produced in a helium arc discharge in the experimental conditio…