Materials Literature
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Entropy of polymer brushes composed of monodisperse flexible polymer chains regularly grafted on a flat substrate plane with an equal “ spacing ” is numerically studied in the good solvent limit. We consider systems of not only a free polymer brush but also a compressed polymer brush and two polymer brushes facing eac…
Abstract The effects of pretreatment and modified atmosphere packaging (MAP) on the quality of fresh‐cut pineapples stored at 4°C were evaluated for 7 days. The pretreatment was conducted by immersing the pineapple slices in a solution containing 0.25% ascorbic acid and 10% sucrose for 2min. MAP contained 4% oxygen, 1…
Sorption of organic contaminants by soils is a determinant controlling their transport and fate in the environment. The influence of ionic strength on nitroaromatic compound sorption by K+- and Ca2+ -saturated smectite was examined. Sorption of 1,3-dinitrobenzene by K-smectite increased as KCl ionic strength increased…
Principal component analysis was applied to XRD data from a series of Mg(OH)2 samples prepared under different hydrothermal conditions from bischofite (MgCl2.6H2O) and carnallite (KCl.MgCl2.6H2O), owing to differences in full width at half-maximum (fwhm) as well as in the intensity ratio I001/I101 of the respective di…
Nitrous oxide reductase (N2OR) from Achromobacter cycloclastes (Ac) can be reductively activated with reduced methyl viologen over a broad range of pH. Activated Ac N2OR displays a complex activity profile as a function of the pH at which catalytic turnover is measured. Spectroscopic and steady-state kinetics data sug…
Light influence: The Co crystal-field parameter was used as a probe of the photoinduced metastable state of a RbCoFe Prussian blue analogue. From the light-induced change in this parameter, a scheme of the photoinduced structural rearrangement is proposed in which cooperative interactions within the three-dimensional…
Abstract The direct polymerization of deprotonated acidic monomers in aqueous solutions was achieved via surface‐confined atom transfer radical polymerization (SC‐ATRP) to produce surface‐tethered polyelectrolyte brushes. Layers of poly(itaconic acid), poly(methacrylic acid), and sodium poly(styrene sulfonate) were gr…
For the first time, nanocrystalline Eu 2 O 3 thin films, exhibiting ∼50% of porous volume, highly accessible mesoporosity, pore diameter of about 10 nm, and thermal stability up to 830 °C, were prepared using the evaporation-induced self-assembly (EISA) process from europium (III) chloride and specific polyethylene ox…
The buckling behavior of single-walled carbon nanotubes under combined axial compression and torsion is investigated by using molecular dynamics simulations, to evaluate interactive buckling loads, and to assess the effect of temperature changes on bucking and postbuckling responses. Simulation results show that both…
A multiple-frequency (9.4-325 GHz) and variable-temperature (276-320 K) electron paramagnetic resonance (EPR) study on low molecular weight gadolinium(III) complexes for potential use as magnetic resonance imaging (MRI) contrast agents has been performed. Peak-to-peak linewidths Delta Hpp and central magnetic fields h…
Graphite nanofibers (GNFs) were doped with platinum in an attempt to activate the materials for moderate temperature hydrogen adsorption. Characterization of the 1% Pt/GNF sample indicates well-dispersed, metallic platinum particles ranging from 2 to 5 nm in diameter. At 27 °C and 20 bar, the hydrogen uptake of 1% Pt/…
In this paper, a method to prepare anodic porous niobium oxide with a thickness of more than half a micrometre is described in terms of delaying the chemical dissolution of the formed oxide in fluorinated electrolytes either by controlling the anodization temperature or by making a protective oxide. It was revealed th…
YVO4 nanocrystals doped with 10.0 mol% Eu3+ have been synthesized from an aqueous solution of (Y,Eu)(NO3)3 and NH4VO3 with or without ultrasonic irradiation. The ultrasonic irradiation has a strong effect on the morphology of the YVO4:Eu particles. The spindle-like particles with an equatorial diameter of 90–150 nm an…
This paper reports on the temperature-induced transport of thermosensitive polymer brush-grafted silica nanoparticles between aqueous and organic phases. Poly(methoxytri(ethylene glycol) methacrylate), a thermosensitive water-soluble polymer with a cloud point of approximately 48 degrees C in H2O, was grown on silica…
A theoretical investigation is conducted for the first time to explore the deliquescence of particles deposited on a substrate. The formulation incorporates the Kelvin effect with the assumption that the dry and wet particles are both spherical caps in shape. Unlike the deposited particles larger than 500 nm, the deli…
The transport properties of two methyl ketones, 2-heptanone and 2-nonanone, through a paper coated with a wheat gluten (WG) solution were studied as a function of aroma compound concentration differential and relative humidity. Whatever the conditions, coating improved the aroma barrier properties of the paper. Wherea…
Sorption/desorption of phenanthrene in two soil samples and carbonaceous materials was found to yield co-incident equilibrium isotherms and no significant hysteresis was observed. Additionally, release of native phenanthrene was investigated. Equilibrium sorption and desorption isotherms were determined using pulveriz…
We precisely cut single-walled carbon nanotubes (SWNTs) to create short nanotubes with controlled length and open ends using an ultra-microtome and magnetically aligned SWNT membranes. At −60 °C, multiple layers of SWNT membranes were stacked and frozen together, and then cut at lengths of 50 and 200 nm, respectively.…
Abstract This work presents (in a wider perspective), some of our recent developments in the mathematical modeling and control of bulk polymerization for the production of HIPS. The recent model by Casís assumes the polymerization to be heterogeneous, and it calculates (in two phases) the global molecular structure of…
Nanoindentation measurements of electrophoretically deposited films of colloidal CdSe nanocrystals, capped by organic ligands, show the films have an elastic stiffness modulus of approximately 10 GPa and exhibit viscoplasticity. This mechanical response suggests polymeric features that are attributable to the ligands.…