Materials Literature
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Abstract Hierarchical ceramics with porosities defined at multiple length scales are of particular interest as catalyst support materials. In fixed‐bed reactors, catalytically active particles or porous pellets are packed in the reactor. A combination of high specific surface area, accessibility to the active sites an…
We study the anisotropic properties of multilayer fishnet optical metamaterials and describe topological transitions between the elliptic and hyperbolic dispersion regimes. In contrast to other hyperbolic media, multilayer fishnet metamaterials may have negative components not only in the effective permittivity tensor…
A new dual ester-urethane melt condensation methodology for biological monomers-amino acids was developed to synthesize new classes of thermoplastic polymers under eco-friendly and solvent-free polymerization approach. Naturally abundant L-amino acids were converted into dual functional ester-urethane monomers by tail…
The objective of the materials analysis particle probe (MAPP) in NSTX is to enable prompt and direct analysis of plasma-facing components exposed to plasma discharges. MAPP allows multiple samples to be introduced to the level of the plasma-facing surface without breaking vacuum and analyzed using X-ray photoelectron…
By characterizing the dynamics of idealized lattice models with a tunable kinetic constraint, we explore the different ways in which dynamical facilitation manifests itself within the local dynamics of glassy materials. Dynamical facilitation is characterized both by a mobility transfer function, the propensity for hi…
The cross-linking and foaming processes of ethylene vinyl acetate (EVA) copolymer with different concentrations of polyethylene (PE), cross-linking agent (α-α′-bis( tert -butylperoxy)- m / p -diisopropylbenzene), and azodicarbonamide (as foaming agent and using additionally ZnO as accelerating agent) have been studied…
Atomic force microscopy (AFM) was used to characterize the surface damage (nanoindentations) effect on the chemical durability of glass surfaces (silica and soda-lime silicate glasses, WG). In basic solutions, an enhanced dissolution rate is reported and quantified at indentation sites (+10.5 nm/h and +52 nm/h for sil…
A reversible locking mechanism is established for the generation of anisotropic nanostructures by a magnetic field pulse in liquid matrices by balancing the thermal energy, short-range attractive and long-range repulsive forces, and dipole-dipole interactions using a specially tailored polymer shell of nanoparticles.…
Three generations of pyrenyl bis-MPA dendrimers with two different end-groups, acetonide (pyr(Gn)) or alcohol (pyr(Gn-OH)) (n = 1-3), were synthesized, and the pyrenyl group of the dendritic molecules was encapsulated in the arene ruthenium metallacages, [Ru(6)(p-cymene)(6)(OO∩OO)(3)(tpt)(2)](6+) (OO∩OO = 5,8-dioxydo-…
Diarylethenes were attached to the 5-position of 2'-deoxyuridine in order to yield three different photochromic nucleosides. All nucleosides were characterized with respect to their absorption and photochromic properties. Based on these results, the most promising photochromic DNA base modification was incorporated in…
Room-temperature precipitation from aqueous solutions yields the hitherto unknown metastable stoichiometric iron selenide (ms-FeSe) with tetragonal anti-PbO type structure. Samples with improved crystallinity are obtained by diffusion-controlled precipitation or hydrothermal recrystallization. The relations of ms-FeSe…
High-purity hydrogen generated by the hydrolysis of sodium borohydride can be used as proton exchange membrane fuel cells (PEMFCs) for portable device applications. Because of its advantages in high storage capacity, controllable reaction, and mild condition, hydrogen generation by catalytic hydrolysis of a chemical h…
Using ab initio molecular dynamics simulations and nudged elastic band calculations we examine the finite temperature stability, transition pathways, and migration mechanisms of large oxygen clusters in UO(2+x). Here we specifically consider the recently proposed split quad-interstitial and cuboctahedral oxygen cluste…
Abstract Recent work has established that marine teleost (bony) fish represent a prolific source of mud grade, mainly high‐Mg calcite, carbonate sediment by means of primary precipitation within the intestine. Previously documented crystalline products display a diverse array of morphologies, many unique in shallow tr…
New biocompatible, pH-responsive, and fully fibrous hydrogels have been prepared based on amyloid fibrils hybridized and gelled by functionalized multiwalled carbon nanotubes (MWNTs) far below the gelling concentration of amyloid fibrils. Sulfonic functional groups were introduced on the surfaces of MWNTs either by a…
Three carbazole chromophores featuring dicyano, cyano, ethyl acetate and dimethyl acetate groups as an acceptor moiety with a <TEX>${\pi}$</TEX>-conjugated spacer and <TEX>$N$</TEX>-methyl dibenzo[<TEX>$b$</TEX>]pyrole as donor were synthesized by Knovenagel condensation and characterized by IR, <TEX>$^1HNMR$</TEX>, <…
We present a study on connectivity percolation in suspensions of hard platelets by means of Monte Carlo simulation. We interpret our results using a contact-volume argument based on an effective single-particle cell model. It is commonly assumed that the percolation threshold of anisotropic objects scales as their inv…
With a rational design of the supra-amphiphiles, we have successfully demonstrated that not only the dimension of the self-assembled nanostructures, but also the packing fashion of the functional naphthalene diimide (a typical n-type chromophore), can be tuned in a noncovalent way in aqueous solution. Naphthalene diim…
We demonstrate the strong dependency of the isotropic-nematic (I-N) transition of discotic suspensions on the aspect ratio (\ensuremath{\xi} $=$ thickness/diameter) via control of the sizes of pristine ZrP crystals and subsequent exfoliation to monolayers. The size fractionation of the I-N transition facilitates the a…
The grain size (GS) effect on the electric field dependence of the dielectric constant in ferroelectric nanoceramics was studied using a detailed model and the predicted behavior compared to experimental data obtained for BaTiO${}_{3}$. In the finest ceramics the permittivity reduces below 1000 and a tendency to linea…