Materials Literature
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Novel gold nanodogbones (GDBs) are successfully fabricated using a simple seeded mediated growth (SMG) method. The shapes of GDBs depend on the amount of added vitamin C solvent. The amount of vitamin C solvent was varied from 10 to 40 µl to investigate the influence of vitamin C solvent on the GDBs. It is found that…
Carbon nanotubes are assembled into dense, vertically aligned arrays on substrates by using capillary forces. Modulating the interactions between the nanotubes and the underlying substrate provides control over the assembly of the nanotube array; capillary forces can either cause bending (left) or translation (right)…
The importance of polymer composites among industrial materials is due to their improved mechanical properties. In recent researches, mechanical and physical properties have been improved by way of making composites with fiber reinforcement. Silk and cotton fibers used in the textile industry have good physical and me…
Abstract With anodic aluminum oxide (AAO) membranes as wetting templates, nanotubes of the cylinder‐forming polystyrene‐ block ‐poly(ethylene oxide) (PS‐ b ‐PEO) copolymer were generated. The PS‐ b ‐PEO solution was introduced into the cylindrical nanopores of an AAO membrane by capillary force and polymeric nanotubes…
Abstract In this study, homogenous dense chitosan membranes were prepared by solution‐casting procedure. Then the membranes were ionically crosslinked by sulfuric acid. The surfaces of chitosan membranes before and after crosslinking were characterized by using FTIR‐ATR, X‐ray photoelectron spectroscopy (XPS), and ato…
The colloidal probe technique (CPT) is used to measure distance-dependent interaction forces between polyelectrolyte layers physisorbed from $1\phantom{\rule{0.3em}{0ex}}\mathrm{M}$ $\mathrm{NaCl}$ solution in salt solutions between $0.1\phantom{\rule{0.3em}{0ex}}\mathrm{mM}$ and $1\phantom{\rule{0.3em}{0ex}}\mathrm{M…
We report reliable ab initio finite field (hyper)polarizability values at Hartree-Fock and second order Moller-Plesset perturbation theory (MP2) levels of theory for different geometrical configurations of small gallium arsenide clusters Ga(n)As(n) with n=2-5. We relied on all-electron basis sets and pseudopotentials…
The transmission of light through a thin Ag film with a periodic subwavelength hole array can be influenced by the presence of the externally applied magnetic field H. Using a three-dimensional finite element method, we show that the spectral locations of the transmission peak resonances can be shifted by varying the…
Lead zirconate titanate (Pb(1.1)(Zr(0.52)Ti(0.48))O(3)) thin films of thickness 260 nm on Pt/Ti/SiO(2)/Si substrates were densified by 2.45 GHz microwave annealing. The PZT thin films were annealed at various annealing temperatures from 400 to 700 °C for 30 min. X-ray diffraction showed that the pyrochlore phase was t…
For spin-polarized electrons in the energy range of $8--21\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ incident off-normally on a W(110) surface, we have measured the energy distribution of secondary electrons using a time-of-flight technique and a position-sensitive detector. Selecting the elastically scattered electrons…
Abstract Micron size particles of poly(ether ether ketone) (PEEK) were prepared by self‐made pan‐type milling equipment operated at ambient temperature. The changes of particle morphology, crystalline properties, thermal behavior, and viscosity‐average molecular mass during milling were studied by SEM, WAXD, DSC, TGA,…
Low-plasma and high-temperature chemical vapor deposition of Si-rich SiO(x) for concurrently enhancing the carrier tunneling and light emission efficiency is investigated. The O/Si composition ratio of the SiO(x) film significantly decreases from 2 to 1.2 as the substrate temperature increases from 200 to 400 °C, corr…
Abstract This study describes the preparation of nanocomposites fabricated from monodispersed iron oxide (Fe 3 O 4 ) and polypyrrole (PPy) by in situ chemical oxidative polymerization. The monodispersed 4 nm Fe 3 O 4 nanoparticles which served as cores were synthesized using the thermal decomposition of a mixture of I…
A strain of Escherichia coli was metabolically engineered to produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) of specified composition between 5% and 18% HV. A gene encoding propionyl-CoA synthetase (prpE from S. enterica) was placed under the control of the IPTG-inducible tac promoter (P(taclacUV5)) while…
The location of the hole and acid proton in neutral nonprotonated and protonated mixed (phthalocyaninato)(porphyrinato) yttrium double-decker complexes, respectively, is studied on the basis of density functional theory (DFT) calculations on the molecular structures, molecular orbitals, atomic charges, and electronic…
For [111] poled barium titanate (BaTiO3) single crystals, piezoelectric properties increased with decreasing domain sizes. To explain the phenomenon, the multidomain crystals were regarded as composite of (a) a distorted 90° domain wall region with ultrahigh piezoelectric property and (b) a normal tetragonal domain re…
The ac conductivity of a new class of disordered solids, i.e. mechanochemically synthesized amorphous fast ion conducting Ag2S–Sb2S3 materials, has been investigated in the audio frequency range (10–107 Hz) down to cryogenic temperatures (∼10 K). The conductivity spectra exhibit the usual signature of a disordered sys…
In this paper we report the observation of enhanced field emission properties from thiolated multi-wall carbon nanotubes (MWCNTs) produced by a simple and effective two-step chemical surface modification technique. This technique implements carboxylation and thiolation on the MWCNTs synthesized by microwave plasma che…
Abstract Electrically conducting elastomer fibers based on natural rubber (NR) and up to 10% w/w polyaniline (PANI) in its emeraldine base (EB) form were fabricated by a wet spinning process. The resulting fibers at various PANI contents were doped by immersion in aqueous HCl solution, which converted the PANI to the…
Abstract An experimental technique, crystallization analysis fractionation (Crystaf), is used to analyze compositional uniformity of ethylene/α‐olefin copolymers and isotactic polypropylene. A computerized method for quantifying Crystaf data is developed based on resolution of Crystaf curves into their elemental compo…