Materials Literature
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In this study, the compaction and sintering behavior of fine alumina powders of different particle sizes and the effect of matrix particle size on biaxial strength and fracture toughness of infused matrices were investigated. Three different alumina powders, In-Ceram alumina, A16SG, and RC172 were selected, representi…
The physics of optical pumping of semiconductor electrons in ferromagnet/semiconductor hybrids is discussed. Optically oriented semiconductor electrons detect the magnetic state of a ferromagnetic film. In turn, the ferromagnetism of the hybrid can be controlled optically with the help of a semiconductor. Spin–spin in…
Abstract In this work, three coupling agents presenting different grafting contents and molecular weights were used to prepare linear low density polyethylene (LLDPE)/linear low density polyethylene grafted with maleic anhydride (LLDPE‐ g ‐MAH)/montmorillonite nanocomposites with various morphologies. The clay dispers…
A computational study of the growth of two-dimensional nematic spherulites in an isotropic phase was performed using a Landau-de Gennes-type quadrupolar tensor order parameter model for the first-order isotropic/nematic transition of 5CB (pentylcyanobiphenyl). An energy balance, taking anisotropy into account, was der…
Abstract The Pressure‐Volume‐Temperature ( PVT ) dependencies of polystyrene‐based clay‐containing nanocomposites (CPNC) were determined in the glassy and molten state. The PVT data in the melt were fitted to the Simha‐Somcynsky (S‐S) lattice‐hole equation‐of‐state (eos), yielding the free volume quantity, h = h ( T ,…
In this article, we review the recent advances in the field of block copolymer membranes. We discuss the similarities and differences between natural membranes and their polymeric counterparts, pointing out the advantages of the latter in applications for biosciences and biomaterials. Membrane properties are discussed…
Tissue engineering of small diameter (<5 mm) blood vessels is a promising approach to develop viable alternatives for autologous vascular grafts. Development of a functional, adherent, shear resisting endothelial cell (EC) layer is one of the major issues limiting the successful application of these tissue engineered…
A series of pyrene based dyad systems together with their dicobalt hexacarbonyl complexes (1b-6b) were synthesized. The pyrene-thiophene dyads are luminescent in room temperature solution with luminescence lifetimes on the nanosecond time scale. At room temperature the dyad emission is quenched by coordination to a Co…
Evidence is presented that vacancy-hole or vacancy-tube (similar to vacancy loops in crystalline materials) migration constitutes an important self-diffusion mechanism in multiwall carbon nanotubes (MWCNTs) when they were irradiated by an electron beam at about $2000\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$…
The metastable binary intermetallic compound Cd4Sb3 was obtained as polycrystalline ingot by quenching stoichiometric Cd-Sb melts and as mm-sized crystals by employing Bi or Sn fluxes. The compound crystallizes in the monoclinic space group Pn with a = 11.4975(5) A, b = 26.126(1) A, c = 26.122(1) A, beta = 100.77(1) d…
The supercurrent in a Josephson junction composed of the zigzag edged graphene nanoribbon (ZGNR) lying between two superconducting leads [superconductor-graphene-superconductor (SGS) junction] has been studied by the Green's function method. It is found that a small transverse electric field applied on the ZGNR can re…
Eine hohe Aktivität ist die Folge der plötzlichen Bildung von fehlgeordnetem oxidiertem Platin über einem Platinkatalysator auf einem Aluminiumoxidträger (siehe Bild). Für diese hohe Aktivität sind eine hohe Temperatur und eine niedrige Kohlenmonoxidkonzentration notwendig.
This report focuses on the effects of different Br2 doping levels on the radial breathing modes of "double-wall carbon nanotube (DWNT) buckypaper". The resonance Raman profile of the Br2 bands are shown for different DWNT configurations with different Br2 doping levels. Near the maximum intensity of the resonance Rama…
Changes in absorption spectra during doping of oligopyrroles were investigated with time-dependent density functional theory on optimized structures of neutral, singly, and doubly charged pyrrole oligomers with up to 24 rings. In the absence of counterions, defects are delocalized. Counterions induce localization. For…
The biocompatibility of cuprammonium rayon (Cu), cellulose acetate, polysulfone (Ps) and polyacrylonitrile hollow-fiber dialyzers and a polycarbonate-polyether flat plate dialyzer has been investigated. The Cu dialyzer resulted in more complement activation and a greater degree of leukopenia than the others, while the…
The organofunctional silicon hydride halides R(CH 3 )SiHCl were prepared in high yields from CH 3 SiHCl 2, employing CH 3 SiH 2 Cl as an intermediate. CH 3 SiHCl 2 was converted to CH 3 SiH 2 Cl by chloride−hydride redistribution in 41% yield (based on Si−H). The chloride substituent in CH 3 SiH 2 Cl reacted selective…
Abstract We have investigated the molecular dynamics of poly(ethylene glycol‐ co ‐cycloxeane‐1,4‐dimethanol terephthalate) (PETG) nanocomposites based on a organically modified layered silicate. Intercalated nanocomposites were prepared by melt compounding technique as evidenced from the X‐ray diffraction and transmis…
Abstract Novel, fluorinated copolymers with different architectures bearing sulfopropyl groups were synthesized in a three‐step procedure. The first step involved atom transfer radical polymerization (ATRP) of aromatic fluorinated monomers followed by two modification reactions performed on the polymer chain: demethyl…
Out-of-equilibrium photoinduced switching from the low-spin to the high-spin state has been investigated on the iron(II) complex $[{\text{Fe}}^{(\text{II})}(\text{DPEA}){(\text{NCS})}_{2}]$ by both optical reflectivity and magnetic measurements under continuous light irradiation at low temperature. The photoinduced HS…
A single crystal of the relaxor ${\text{PbMg}}_{1/3}{\text{Nb}}_{2/3}{\text{O}}_{3}$ is studied by hyper-Raman scattering. The relative scattering intensities obtained for the band near $250\text{ }{\text{cm}}^{\ensuremath{-}1}$ in various polarization geometries are fully compatible with hyper-Raman spectroscopy tens…