Materials Literature
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Abstract A radiofrequency air plasma has been used to incorporate new functionalities at the surface of cycloolefin polymers (Zeonex® and Topas®), polymethyl methacrylate (PMMA), styrene–acrylonitrile copolymer (SAN), and polystyrene (PS). The main goals with the plasma treatment of the different plastics were to hydr…
The diesel particulate filters (DPFs) technology has impressively advanced especially during the last years, driven by the interest in the reduction of automobile particulate emissions. This paper is concerned with the effect of NO 2 as an active oxidation agent in the regeneration process of the soot accumulated in t…
A quarter of a century ago, Chemical Communications published a seminal paper called “Synthesis of Electrically Conducting Organic Polymers: Halogen Derivatives of Polyacetylene, (CH)x”. A new field of chemistry was born.
We demonstrate bulk synthesis of highly crystalline beta-gallium oxide tubes, nanowires, and nanopaintbrushes using molten gallium and microwave plasma containing a mixture of monatomic oxygen and hydrogen. Gallium oxide nanowires were 20-100 nm thick and tens to hundreds of micrometers long. Transmission electron mic…
A purification algorithm for expanding the single-particle density matrix in terms of the Hamiltonian operator is proposed. The scheme works with a predefined occupation and requires less than half the number of matrix-matrix multiplications compared to existing methods at low (<10%) and high (>90%) occupancy. The exp…
We study the properties of a polycarbonate melt near a nickel surface as a model system for the interaction of polymers with metal surfaces by employing a multiscale modeling approach. For bulk properties, a suitably coarse-grained bead-spring model is simulated by molecular dynamics methods with model parameters dire…
Time-resolved synchrotron small-angle X-ray scattering (SAXS) studies were performed to investigate the unseeded formation and growth of colloidal calcium carbonate particles. Equimolar aqueous solutions of CaCl 2 ·2H 2 O and Na 2 CO 3 were rapidly mixed in a stopped-flow apparatus, and SAXS data were recorded using a…
We have studied the coefficient of restitution, $η$, in normal collisions of a non-rotating sphere on a massive plate for a range of material parameters, impact velocity and sphere size. The measured coefficient of restitution does not monotonically vary with velocity. This effect is due to dynamics that occur during…
This paper presents a nonlinear, robust control algorithm for accurate positioning of a single degree of freedom rotary manipulator actuated by Shape Memory Alloy (SMA). A model for an SMA actuated manipulator is presented. The model includes nonlinear dynamics of the manipulator, a constitutive model of Shape Memory…
The miscibility and phase behavior of two stereoisomer forms of poly(lactide) (PLA: poly (L-lactide) (PLLA) and poly(DL-lactide) (PDLLA)) blends with poly(epsilon-caprolactone)-b-poly(ethylene glycol) (PCL-b-PEG) and PCL-b-monomethoxy-PEG (PCL-b-MPEG) block copolymers have been investigated by differential scanning ca…
Pure hexagonal-phased Y 1 - x BO 3:Eu x ( x = 0−0.30) nanocrystals with different particle sizes were prepared by a facile sol−gel pyrolysis process, and their photoluminescence spectra evidently showed a size-dependent characteristic because the ratio of the red emission transition ( 5 D 0 → 7 F 2 ) to the orange emi…
We treat homogeneous electric fields within density functional calculations with periodic boundary conditions. A nonlocal energy functional depending on the applied field is used within an ab initio molecular dynamics scheme. The reliability of the method is demonstrated in the case of bulk MgO for the Born effective…
Abstract The aim of this investigation was to evaluate the possibility of mechanically recycling blends of ABS with minor amounts of semicrystalline engineering plastics, such as polyamide, poly(ethylene terephthalate), and poly(butylene terephthalate). Compatibilizers and a core–shell impact modifier were incorporate…
The quenching of photoluminescence (PL) intensity due to exposure to laser radiation (0.25 W cm −2 ) and complete recovery is observed for porous silicon nanoparticles (PSNs) embedded in an optically transparent ultraviolet cured polymer. Under identical laser exposures, the PL intensity of PSNs embedded in transparen…
The physical properties of plasma-deposited hydrogenated amorphous-carbon films (a-C:H) are investigated and correlations to the competing intrinsic and extrinsic stress fields are established. The (a-C:H) films are grown on single-crystal 〈100〉 silicon substrates in a plasma reactor using acetylene as a precursor. Al…
Abstract New conjugated copolymers containing alternating N ‐hexyl‐3,8‐iminodibenzyl and divinylbenzene chromophores {poly( N ‐hexyl‐3,8‐iminodibenzyl‐1,2‐ethenylene‐2,5‐dihexyloxy‐1,4‐phenylene‐1,2‐ethenylene) ( P1 ) and poly[ N ‐hexyl‐3,8‐iminodibenzyl‐2,5‐bis(hexyloxy)cyanoterephthalidene] ( P2 )} were synthesized…
Amine addition to cis -aconityl anhydride has been used to prepare monomers needed to make water-soluble polymers that are being developed for biomedical applications. Unfortunately competitive decarboxylation, double bond isomerization, and hydrolysis reactions of cis -aconityl anhydride have been observed during mon…
The spectral variation of the effective dielectric constant in porous silicon thin films is modeled using effective medium theories. The pores in the material are supposed to be spheroid prolate inclusions in a homogeneous matrix. We employ modified Maxwell–Garnett and Bruggeman expressions obtained from previous work…
Solid oxide fuel cells comprised of an anode made from sintered and reduced mesoporous-NiO-YSZ are shown to provide stable current and power densities at the operating temperature of 800 degrees C and show better performance than cells with anode cermets made from mechanical mixtures of NiO and YSZ, attributable to th…
The functional form of the time decay of the remanent polarization under high-electrical drives, known as fatigue, has been derived for relaxor piezoelectric materials based on the hierarchical relaxation process, typical of disordered systems such as random-field and glassy states and is given in terms of normalized…