Materials Literature
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Abstract A facile synthesis route is described for the preparation of a gold–polyaniline nanocomposite material. The gold nanoparticles were highly dispersed and stabilized throughout the polyaniline fibers that formed a metal–polymer composite material. We measured the temperature‐dependent electrical conductivity of…
Abstract 3,4‐Dihydrocoumarin (DHCM) is an aromatic six‐membered lactone, which does not undergo anionic homopolymerization. However, it does undergo copolymerization with an epoxide. The striking feature of this copolymerization is its 1:1 alternating nature, which allows for the formation of polyesters. In this mini‐…
We report the fabrication of a hybrid all semiconductor core/shell nanotetrapod structure consisting of crystalline ZnS:Mn core and amorphous Si shell for the first time. The nanostructures were produced via a catalyst-free rapid thermal evaporation technique. Core/shell nanotetrapods were formed in two steps: (i) for…
For the first time, single-walled carbon nanotubes were dispersed with titanate nanotubes using bio-polymers. Direct injection (wet spinning) of the stable suspension of H2Ti3O7 and SWNTs into coagulation baths produced fibers. The mechanical and electrical properties along with surface morphology and electrochemistry…
Integrated Environmental Assessment and ManagementVolume 5, Issue 4 p. 720-722 Departments Silver nanoparticle toxicity and biocides: Need for chemical speciation Jim Kramer, Corresponding Author Jim Kramer [email protected] McMaster University, Hamilton, ON, CanadaMcMaster University, Hamilton, ON, CanadaSearch for m…
Under the generalized coherent-potential approximation, we established a "quasimode" theory to study the effective-medium properties of electromagnetic metamaterials. With this theory, we calculate the self-energy, density of states (DOS), and mean-free paths for optical modes traveling inside a metamaterial, and then…
Abstract Extended defects acting as non‐radiative recombination center or those acting as radiative one were, respectively, studied by transmission electron microscopy under the illumination of a monochromatic light or cathodoluminescence spectroscopy combined with light illumination. By means of this method, defect l…
Abstract The purpose of this study was to manufacture urea‐formaldehyde‐based particleboard from hazelnut shell and eliminate its disadvantages such as flammability, water absorption, swelling thickness by using fly ash and phenol‐formaldehyde. Synthesized urea‐formaldehyde and grained hazelnut shells were blended at…
We are showing that a 20nm lithography resolution is theoretically feasible at a 193nm illumination wavelength if employing aluminum (Al) superlens structure with index matching layer. It is illustrated that transmissivity of evanescent waves for certain wavevector bands can be enhanced by an index matching layer. It…
Abstract CaCu 3 Ti 4 O 12 –polyethersulfone (CCTO–PES) composites with various CCTO volume fractions up to 0.5 were prepared. Relatively high dielectric constant ( ε = 32.7) and low loss (tan δ = 0.063) of the composites with CCTO volume fraction at 0.5 were observed. Various theoretical models were employed to predic…
We describe a method to measure the viscosity of polystyrene liquid films with thicknesses ∼5 and ∼80 nm spin-cast on oxide-coated silicon. In this method, temporal evolution of the film surface is monitored and modeled according to the dynamics of the surface capillary waves. Viscosities obtained from the ∼80 nm film…
The liquid phase of the AgInSbTe phase change material Ag3.5In3.8Sb75.0Te17.7 has been studied using molecular dynamics/density functional simulations. The calculated structure factor and total pair distribution function agree very well with high-energy x-ray diffraction measurements. We find that: (a) there are signs…
n -ZnO thin films were deposited electrochemically onto the p-GaN/Al2O3 substrate in order to form hetero p-n junction. X-ray diffraction measurement has been showed clearly (0002) c-axis orientation of grown ZnO thin film. Absorption measurements were carried out before and after growth process indicating both sharp…
Abstract La 2− x Bi x Mo 2 O y ( x = 0, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08, 0.1, 0.16, 0.24, 0.3) ceramic samples have been characterized by X‐ray diffraction, differential scanning calorimetry (DSC) and conductivity measurements in order to assess the dynamics of the transitions between the low‐temperature ( α ), hig…
Abstract The paper provides the properties of single crystalline 4H‐SiC under helium implantation at temperatures of implantation up to 750 °C and fluences in the range 5 × 10 15 –1 × 10 17 cm −2 . The microstructure evolution was studied by transmission electron microscopy cross‐section and X‐ray diffraction experime…
${\text{BiFe}}_{0.7}{\text{Mn}}_{0.3}{\text{O}}_{3+\ensuremath{\delta}}$ with space group $R3c$ is reported to go through two phase transformations, first to the orthorhombic paraelectric phase $(Pbnm)$ and finally to cubic perovskite structure with space group $Pm\overline{3}m$. A discontinuity in volume and enthalpy…
This work reports experimental evidence for a redshift in the main peak in the valence electron energy loss spectrum of nanoporous MgO. An interpretation is given based on effective-medium response theory. We find that the main peak energy depends on the density of nanopores within the illuminated area. As a result, b…
We study the influence of mutual interaction on the conformation of flexible poly(propyleneamine) dendrimers of fourth generation in concentrated solution. Mixtures of dendrimers with protonated and deuterated end groups are investigated by small-angle neutron scattering up to volume fractions of 0.23. This value is i…
A detailed single-crystal X-ray study of conformationally flexible sulfonimide-based dendritic molecules with systematically varied molecular architectures was undertaken. Thirteen crystal structures reported in this work include 9 structures of the second-generation dendritic sulfonimides decorated with different ary…
Probing with a tip of scanning tunneling microscopy (STM) of metallic single-walled carbon nanotubes (SWCNT) was found to induce defects in the tubes. The primary defect formation by probing was enhanced with a rate proportional to tunnel-injected electron current above a sample-bias threshold of around +4 V. Scanning…