Materials Literature
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Abstract Polymer/carbon nanotube nanocomposites were fabricated with end‐functionalized polymers as dispersants. End‐functionalized polymers having amine or carboxylic acid were noncovalently grafted to multiwalled nanotubes (MWNTs). The functional groups of the polymers interacted with the defect sites of purified MW…
We report the epitaxial growth and magnetic properties of MnTiO3 thin films with an ilmenite structure. Although the lattice mismatch with sapphire substrates was as large as 8.0%, highly crystalline films with atomically flat surfaces were grown by using pulsed laser deposition. X-ray diffraction and transmission ele…
Abstract In this study, the solubility and precipitation properties of medical‐grade stereocopolymers were investigated. The solubility of the polymers was tested with eight different organic solvents and four nonsolvents. The solubility of poly( L,D ‐lactide) stereocopolymers was highly dependent on the L / D ratio o…
In contrast to the most commonly studied nanocrystals of II-VI materials, resonant Raman spectra of colloidal III-V quantum dots (QDs) show two almost equally intense peaks centered approximately at the longitudinal and transverse optical (TO) bulk phonon frequencies. The ``anomalous'' spectra of III-V QDs are explain…
The protection performance of a thick polyurethane coating was studied by using an electrochemical impedance spectroscopy in 3% NaCl solution. Electrolytic penetration through the coating changes the dynamic characteristics of the conduction and resistance of the coating film of the protected system over time. Equival…
Abstract This article describes an in situ bulk polymerization process of styrene in the presence of silica nanoparticles. In this peroxide bulk polymerization process, two polystyrene fractions are formed: A polystyrene (PS) fraction attached to the particle's surface, which cannot be detached by hot xylene extractio…
Abstract The electrochemical preparation of polyaniline/polypyrrole (PANI/PPy) conducting polymer composite film on Tin oxide glass electrode from an aqueous solution containing a pyrrole monomer, p ‐toluenesulphonate electrolyte on to a polyaniline polymer doped with sulfuric acid, and sodium perchlorate is reported.…
(1− x )Ba 0.6 Sr 0.4 TiO 3 – x MgAl 2 O 4 ceramics with x =10, 20, 30, and 40 wt% prepared by the mixed‐oxide route at 1500°C display two crystalline phases, a cubic perovskite structure Ba 0.6 Sr 0.4 TiO 3 (BST) and a face‐centered‐cubic spinel structure MgAl 2 O 4 (MA). A significant agglomeration of BST grains is o…
A systematic study of current path in spark plasma sintering was conducted to determine its effect on the sintering of an insulating material. The current, voltage, temperature, and densification characteristics of Al 2 O 3 held under constant pressure in a graphite die were determined. A comparison was made between s…
Abstract A poly( L ‐lactic acid) (PLLA)/poly( D ‐lactic acid) (PDLA) stereocomplex was prepared from an equimolar mixture of commercial‐grade PLLA and PDLA by melt processing for the first time. Crosslinked samples were obtained by the radiation‐induced crosslinking of the poly(lactic acid) (PLA) stereocomplex mixed w…
Abstract Polyamides (PAs) and polyimides (PIs) containing two silarylene units were synthesized and characterized by their spectroscopic properties. Bis(4‐aminophenyl)methylphenylsilane was employed as a unique diamine, whereas acid dichloride and dianhydride monomers contained combinations of methyl and phenyl groups…
Abstract New biobased, eco‐friendly nanocomposites were prepared from maleated polycaprolactone/soy protein isolate blend (50/50 wt/wt) with organo‐modified clay by melt compounding. The XRD, TEM, tensile, DMTA, and rheological properties of the nanocomposites were investigated. X‐ray diffraction and transmission elec…
Photodiodes with a p-ZnO/oxide/n-Si substrate structure were fabricated. The N-In codoped p-type ZnO films were deposited by ultrasonic spray pyrolysis on a (111)-oriented silicon substrate with a thin oxide layer. A photocurrent of ~ 4.99 × 10-5 A was measured at a reverse bias of 1 V, and a photocurrent to dark curr…
We predict here from first-principle calculations that finite-length (n,0) single walled carbon nanotubes (SWCNTs) with H-termination at the open ends displaying antiferromagnetic coupling when n is greater than 6. An opposite local gating effect of the spin states, i.e., half metallicity, is found under the influence…
Abstract The comparative studies for the effect of vinyl‐modified silica (VMS) and raw silica (RS) particles on the cell structure, insulation (dielectric and thermal transport) properties, and thermal stability of thermoplastic PMMA‐silica nanocomposite (PSN) foams are described. The VMS particles were synthesized by…
At low energy, the band structure of graphene can be approximated by two degenerate valleys $(K,{K}^{\ensuremath{'}})$ about which the electronic spectra of the valence and conduction bands have linear dispersion relations. An electronic state in this band spectrum is a linear superposition of states from the $A$ and…
To study ferroelectric size effects in heteroepitaxial SrRuO3∕BaTiO3∕SrRuO3 capacitors, ultrathin BaTiO3 layers were deposited in wedge form across SrTiO3 substrates. The wedgelike films were fabricated by using either an off-center substrate-target geometry or via a moveable shutter during high-pressure sputter depos…
Abstract The carbon nanotubes (CNTs) contents, ultrahigh‐molecular‐weight polyethylene (UHMWPE) concentrations and temperatures of UHMWPE, and CNTs added gel solutions exhibited significant influence on their rheological and spinning properties and the drawability of the corresponding UHMWPE/CNTs as‐prepared fibers. T…
We have investigated density, thermal expansion, and surface tension of Si, Ge, and Si–Ge alloys in the melt and undercooled state under microgravity conditions. The experiments were conducted in the TEMPUS facility on board a Zero-G aircraft. The density of the liquid alloys as a function of composition show a nonide…
This pilot study examines noninvasive MR monitoring of tissue‐engineered vascular grafts (TEVGs) in vivo using cells labeled with iron oxide nanoparticles. Human aortic smooth muscle cells (hASMCs) were labeled with ultrasmall superparamagnetic iron oxide (USPIO) nanoparticles. The labeled hASMCs, along with human aor…