Materials Literature
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Abstract This work investigates the effects of photodegradation on the environmental stress cracking resistance of polycarbonate (PC). Injection molded samples were exposed to the ultraviolet (UV) light for various times in the laboratory prior to solvent contact. The bars were then stressed with two different loads i…
Abstract Styrene‐butadiene rubber (SBR) and nitrile‐butadiene rubber (NBR) blends are immiscible. Fillers can be used as compatibilizers. The SBR + NBR blends reinforced with a mesoporous silica and a precipitated silica are characterized by studying their miscibility by the determination of rubber bound, their change…
Abstract This work describes the preparation of polymers potentiodynamically formed on surface of graphite electrode by anodic oxidation of 2, 3, or 4‐aminophenol monomers, as well as incorporation and detection of purine and pyrimidine bases on these modified electrodes. The electrochemical behavior of the formed fil…
The oscillatory characteristics and the instability of double- and triple-walled carbon nanotube-based oscillators containing a vacancy or a Stone–Wales (SW) defect were investigated by molecular dynamics simulations. It was found that the existence of these defects markedly affects the oscillation period and amplitud…
Abstract The energies of the Raman G‐band transitions in both metallic and semiconducting CNTs are renormalized by the electron‐phonon interaction, leading to energy shifts in Raman spectra of gated CNT devices. In addition in metallic CNTs, the linewidth decreases sharply upon electrostatic doping because the Γ‐point…
Abstract Ultrafast intraband carrier relaxation in carbon nanotubes can be described by Carbon Nanotube Bloch Equations (CNBE) treating the Coulomb interaction beyond the Hartree‐Fock level to include carrier‐carrier scattering. We obtain equations of motion for carrier densities and two‐particle carrier correlations…
Abstract We present a novel dry and room‐temperature method for the deposition of random carbon nanotube networks (CNTNs) onto various substrates. This method is based on natural charging of carbon nanotube (CNT) bundles in the gas‐phase and their efficient deposition directly downstream of the synthesis reactor by me…
Abstract Exfoliated polystyrene nanocomposites have been synthesized by in situ bulk multistep polymerization of polystyrene (PS) in the presence of the filler. The filler was layered double hydroxide (LDH)–tetracalcium aluminate hydrate, modified by the intercalation of benzoate anions (Ca 4 Al 2 (OH) 12 (C 6 H 5 COO…
Abstract Polar meso ‐tetraarylporphyrins 2 – 4 were synthesized from tetrakis‐4‐hydroxyphenylporphyrin 1 as the central building block by consecutive base‐induced reactions with glycidol. The decorating units form a polar hydrogen‐bonded shell around the sensitizer core which is proposed as the binding site for polar…
Heterostructures composed of perovskite overlayers on anatase TiO2 films were fabricated on LaAlO3 substrates. By depositing LaTiO3 and LaAlO3 thin films on the insulating anatase TiO2 films, metallic conduction was induced in the anatase layer with the increasing thickness of the perovskite overlayer. This perovskite…
Abstract In this work we have measured the G′ Raman band of bilayer graphene using several laser lines. We show that from the analysis of the experimental data in the framework of the double resonance Raman model we can derive the Slonczewski‐Weiss‐McClure band parameters of bilayer graphene. We analyze the behavior o…
Abstract Polyurethane (PU) and poly(vinyl acetate) (PVAc) are partially miscible polymers. The aim of this study was to investigate the influence of untreated and surface pretreated calcium carbonate (CaCO 3 ) on the interphase properties of PU/PVAc polymer blends with possible compatibilization effects when the condi…
The unoccupied conduction band and the occupied valence band of $\ensuremath{\alpha}$- and $\ensuremath{\beta}$-brass (Cu-Zn) have been studied by inverse photoemission and photoemission spectroscopy. The experimental spectra have been interpreted with the help of calculations based on full potential linearized augmen…
It is shown by extending the Landau theory of freezing that a tendency to form multicontinuous complex structures is possessed by simple systems consisting of rigid rodlike particles. The excellent stability of the Gyroid phase, which is most widely observed in nature, is naturally explained. An exotic structure found…
Through the thermochemical control of a liquid droplet on a solid substrate, we investigated the motion of the droplet and the underlying mechanism. Depending on the contact angle of the running droplet on the substrate with a chemical gradient coating, we observed two different behaviors for the droplet under local l…
Abstract Electrically conducting composites based on polyaniline‐H 2 SO 4 /polycardanol were prepared with a mechanical mixing method. The influence of the composition on the electrical performance of the composites was evaluated. Materials were characterized by Fourier Transform Infrared Analysis and Near Infrared An…
Abstract The residence time of coordinated water ( τ M ), a parameter of paramount importance for relaxivity, is compared in a series of Gd–DTPA derivatives carrying different global charges. The importance of the charge in the first coordination sphere of the metal and in its vicinity is reported. Neutral bisester an…
Neutron diffraction with copper isotope substitution was used to study the structure of glassy ${\text{Cu}}_{5}{\text{As}}_{46.25}{\text{Se}}_{48.75}$, which lies at $x=0.0513$ on the ${({\text{Cu}}_{2}\text{Se})}_{x}{(\text{AsSe})}_{1\ensuremath{-}x}$ pseudobinary tie line. The results are consistent with fourfold co…
Abstract The aggregation of polyhedral oligomeric silsesquioxane (POSS) in copolymers was studied by incorporation of POSS into fluorinated copolymers, namely poly(octafluoropentyl acrylate) elastomers. The aggregation of POSS in copolymers affords unique materials. Studies of these novel polymers show POSS aggregates…
Abstract Perfect single crystals of cadmium oxalate trihydrate have been grown using the slow and controlled reaction between Cd +2 and (C 2 O 4 ) ‐2 ions in agar‐agar gel, resulting in the formation of insoluble product Cd(COO) 2 .3H 2 O. The optimum growth parameters have been determined. The variation of magnetic m…