Materials Literature
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Abstract A series of random copolyamic acid were synthesized from various ratios of two diamines 4, 4′‐oxydianiline (ODA) and 2‐(4‐aminophenyl)‐5‐aminobenzimidazole (PABZ) by polycondensation with pyromellitic dianhydride (PMDA) in N ‐methyl‐2‐pyrrolidone (NMP). Their inherent viscosities were in the range of 1.89–2.9…
The phase separation of diblock copolymers containing some energetically neutral/biased nanoparticles is studied by means of large-scale dissipative particle dynamics (DPD) simulations. The effects of the volume fraction of nanoparticles, the size of nanoparticles, and the interaction strength between nanoparticles an…
The mechanical properties of short uniaxially-oriented intimately-mixed kapok/glass fabric-reinforced polyester hybrid composites were investigated with reference to the fabric content, keeping the volume ratios of kapok to glass at 1:0, 3:1, 1:1, 1:3, and 0:1. The 9 vol% of fabric for kapok/glass was optimized. Hybri…
Synchrotron x-ray diffraction and diamond-anvil cell techniques were used to characterize pressure induced structural modifications in gallium oxide. Gallium oxide was studied on compression up to $70\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$ and on the following decompression. The effect of the pressure-transmitting me…
Abstract In this article, simple viscoelastic and empirical models are presented to predict and analyze the flexural creep behavior of all‐poly(propylene) (all‐PP) composites. Results of the successful application of these models to the actual creep behavior of unidirectional (UD) and cross‐ply (CP) all‐PP composites…
A simple apparatus for achieving beam sizes in the range 5-10 μm on a synchrotron beamline was implemented in combination with a small 125 x 25 μm focus. The resulting beam had sufficient flux for crystallographic data collection from samples smaller than 10 x 10 x 10 μm. Sample data were collected representing three…
Abstract Chitosan, as a novel bioadditive antioxidant for commodity polymer, is proposed. Chitosan is successfully conjugated with deoxycholic acid and gallic acid (chitosan‐DC‐GA) via a simple reaction using the 1‐ethyl‐3‐(3′‐dimethylaminopropyl) carbodiimide/ N ‐hydroxysuccinimide conjugating agent at room temperatu…
The use of an approximate reference state wave function mid R:Phi(r) in electronic many-body methods can break the spin symmetry of Born-Oppenheimer spin-independent Hamiltonians. This can result in significant errors, especially when bonds are stretched or broken. A simple spin-projection method is introduced for aux…
This work reports the results of an extensive search for ferromagnetism in SnO2 doped with a wide range of transition metal cations (M=V, Cr, Mn, Fe, Co, and Ni). By varying the dopant concentration in the 0–12% range, signatures of ferromagnetic behavior in varying degrees were observed with most dopants. The room te…
By calculating free energies, several published interatomic interaction potentials for iron are investigated with respect to the stability of the low-temperature bcc phase and the high-temperature fcc phase. These are empirical many-body potentials for use in atomistic simulation. We find that in all of these potentia…
All wired up! High-quality colloidal PbS and CdS nanowires were grown from Bi nanoparticles by the solution–liquid–solid (SLS) mechanism. The single-source-precursor strategy could provide a general approach for the synthesis of colloidal semiconductor nanowires.
Based on the successful use of silk scaffolds in bone tissue engineering, we examined their utility for mineralized dental tissue engineering. Four types of hexafluoroisopropanol (HFIP) silk scaffolds-(250 and 550 microm diameter pores, with or without arginine-glycine-aspartic acid (RGD) peptide) were seeded with cul…
This article summarizes the general structural features and important properties of quasicrystals, a relatively new class of materials belonging to solid-state substances. Quasicrystals, which have a long-range quasiperiodic order but no three-dimensional translational periodicity, are structurally different from both…
Contrary to interstitial metal hydrides, where the thermodynamic stability of the metal hydride can be tuned by substitutions on the metal lattice, few examples of such substitutions have been reported for complex hydrides. The present paper shows a new and alternative approach to affect the stability of complex hydri…
The enormous species diversity of diatoms correlates with the remarkable range of cell sizes in this group. Nuclear DNA content relates fundamentally to cell volume in other eukaryotic cells. The relationship of cell volume to G1 DNA content was determined among selected members of the genus Thalassiosira, one of the…
The synthesis and structural study of the stoichiometric perovskite La 0.5 Ba 0.5 CoO 3 have allowed three forms to be isolated. Besides the disordered La 0.5 Ba 0.5 CoO 3 and the perfectly ordered layered LaBaCo 2 O 6, a third form called nanoscale-ordered LaBaCo 2 O 6 is obtained. As evidenced by transmission electr…
Abstract Poly(vinylidene fluoride) (PVDF) was electrospun into ultrafine fibrous membranes from its solutions in a mixture of N , N ‐dimethylformamide and acetone (9:1, v/v). The electrospun membranes were subsequently treated by continuous hot‐press at elevated temperatures up to 155°C. Changes of morphology, crystal…
The nucleation and growth of three-dimensional superlattices of gold nanoparticles has been followed directly in situ by means of small angle x-ray scattering. These assemblies spontaneously form in a dilute solution providing the particles are large enough to generate a van der Waals driven attraction sufficient to c…
The impact of microbial activity on biofilm calcification in aquatic environments is still a matter of debate, especially in settings where ambient water has high CaCO3 mineral supersaturation. In this study, biofilms of two CO2-degassing karst-water creeks in Germany, which attain high calcite supersaturation during…
We present the ReaxFF reactive force field developed to provide a first-principles-based description of oxygen ion transport through yttria-stabilized zirconia (YSZ) solid oxide fuel cell (SOFC) membranes. All parameters for ReaxFF were optimized to reproduce quantum mechanical (QM) calculations on relevant condensed…