Materials Literature
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Abstract The bulk morphology of poly(1,4‐butadiene)– block –polystyrene– block –poly (ethylene oxide) (PB‐ b ‐PS‐ b ‐PEO) and polyethylene– block –polystyrene– block –poly (ethylene oxide) (PE‐ b ‐PS‐ b ‐PEO) triblock terpolymers is analyzed under a thermal protocol. This allows the investigation of the morphology dur…
Abstract Isothermal crystallization of poly(butylene terephthalate) (PBT) blended with oligomeric poly(ε‐caprolactone) (PCL) is investigated by polarized optical microscopy and differential scanning calorimetry at various temperatures ( T c ). The growth rate of PBT spherulites is found to depend on time ( t ), as the…
Abstract Poly( p ‐dioxanone) with an inherent viscosity of over 1 dL/g has been synthesized using the cyclic tin alkoxide 1‐di‐ n ‐butyl‐1‐stanna‐2,5‐dioxacyclopentane as initiator. Poly( p ‐dioxanone) was synthesized in bulk and the results have been compared with polymerizations using tin (II) 2‐ethylhexanoate (Sn(O…
We demonstrate a time-of-flight electron energy analyzer that operates at an 80MHz repetition rate. The analyzer yields an energy resolution of 40meV for 3eV electrons. The energy resolution limit is dominated by the detector time (or temporal) resolution. With a currently available detector with a temporal resolution…
Abstract Well‐defined polyurethane–polydimethylsiloxane particles of tunable diameter in the range of 0.5–20 μm were synthesized in “one‐shot” by step‐growth polymerization using supercritical carbon dioxide (scCO 2 ) as a dispersant medium. Polymerizations were carried out at 60 °C and above 25 MPa, after the solubil…
Abstract Four novel A‐B condensation monomers containing an amine and a carboxylic acid function are described, along with their polymerization to give main chain aromatic poly(amide urea)s. The monomers, and the polymer structural unit, are N , N ′‐diphenylurea derivatives. When comparing wholly aromatic polyamides,…
The phase transition was electrically investigated in (100)-oriented BaTiO3 thin and thick films deposited on Si substrate using double alkoxide solutions. Changes of the dielectric constant as a function of temperature in the range of −200–200°C indicate that the transition from paraelectric to ferroelectric phase ta…
We calculated the energy variation due to the emergence of a new domain in barium titanate single crystal using equivalent inclusion method, and energy minimizing domain morphology and orientations have been identified. It is found that the energy difference between the charged and uncharged domain walls is relatively…
This study focuses on the fabrication of two nanodevice prototypes which utilized vertical and horizontal carbon nanotubes used the focused ion beam to localize the catalysts, followed by plasma-enhanced chemical vapor deposition. First, metal-gated carbon nanotube field emitter arrays were fabricated on multilayer su…
We report magnetic circular dichroism measurements on thin GaMnAs films with low Mn concentration, which reveal that exchange-induced spin splitting of the band edges occurs only in samples that show ferromagnetic order, and is not observed in paramagnetic samples. These results lead to the conclusion that Mn ions in…
X-ray porosimetry is used to characterize the porosity, the average film density, and the density of the wall material between the pores in ultralow-k films as a function of film thickness. These measurements are performed on films that have been plasma treated as well as plasma etched and an ashed to evaluate how the…
Abstract A supramolecular material containing quadruple hydrogen bonding sites was prepared by reacting the amines of methyl isocytosine and the epoxy groups of poly (ethylene glycol diglycidyl ether). This supramolecular polymer was complexed with metal salt, that is potassium iodide, to produce polymer electrolytes,…
The propagation of heat pulses in zigzag and armchair double wall nanotubes (DWNTs) has been investigated using molecular dynamics simulations. It is found that the leading heat wave packets in zigzag $(9,0)∕(18,0)$ and armchair $(5,5)∕(10,10)$ DWNTs move with the speed of longitudinal acoustic (LA) phonon modes. The…
In situ solid-state H1 NMR spectroscopy was employed to investigate the local chemical environments and dynamic details of protons in ZnO nanorods. The mean correlation time for the 4.8ppm resonance was found to be ∼2.1×10−10s at 500K and the activation energy for proton hopping was ∼0.15eV. Both the small activation…
Single-crystal rods of the α-phase of potassium nitrate were grown with [010] uniform crystallographic orientation inside a matrix of aluminum oxide nanopores. The pores were prepared by anodization of polished aluminum substrates. The potassium nitrate single crystals were grown inside the pores from a supersaturated…
Abstract A new synthetic approach to prepare Ag nanoparticles protected side‐chain liquid crystalline (LC) azobenzene polymers was reported. It is based on the reduction of silver ions in presence of a LC polymer polymerized by RAFT. The formation of Ag colloidal nanoparticles was confirmed by TEM and UV analysis. At…
A silicon (Si) nanowire grid ultraviolet (UV) transmission polarizer has been fabricated, and its performance was measured over the visible to deep UV range. A cylinder-forming polystyrene-b-poly(hexylmethacrylate) diblock copolymer was coated onto an amorphous Si layer supported on a fused silica substrate, then shea…
Dense hexagonal TmMnO3 ceramics were synthesized by solid-state reaction technique combined with high-pressure treatment which significantly increased the density of ceramic samples. The crystal structure of the hexagonal TmMnO3 oxide was refined by using Rietveld analysis based on powder x-ray diffraction experiment.…
The adhesion force between blood-compatible polymer (poly(2-methoxyethyl acrylate: PMEA) and proteins (fibrinogen and bovine serum albumin (BSA)) were measured by atomic force microscopy. The PMEA surface showed almost no adhesion to native protein molecules, whereas non-blood-compatible poly(n-butyl acrylate): PBA st…
Abstract This review presents firstly the synthesis of various dendritic hyperbranched polymers with well‐defined structures by generation‐based growth methodologies using living/controlled polymerization. Secondly, the synthesis of dendritic hyperbranched poly(methyl methacrylate)s (PMMAs) and their functionalized bl…