Materials Literature
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We study the failure properties of fiber bundles with a finite lower cutoff of the strength disorder varying the range of interaction between the limiting cases of completely global and completely local load sharing. Computer simulations revealed that at any range of load redistribution there exists a critical cutoff…
The effect of ultrasonic treatments of different intensity and duration on the integrity and permeability of polyelectrolyte capsules was investigated both in poly(allylamine)/poly(styrene sulfonate) and Fe(3)O(4)/poly(allylamine)/poly(styrene sulfonate) polyelectrolyte capsules. Ultrasonic treatment of polyelectrolyt…
The latent heat $(L)$ associated with the orbital order-disorder transition at ${T}_{JT}$ is found to depend significantly on the average particle size $(d)$ of $\mathrm{La}\mathrm{Mn}{\mathrm{O}}_{3}$. It rises slowly with the decrease in $d$ down to $\ensuremath{\sim}100\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ and th…
We introduce a novel and versatile approach for preparing self-assembled nanoporous multilayered films with tunable optical properties. Protonated polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and anionic polystyrene-block-poly(acrylic acid) (PS-b-PAA) block copolymer micelles (BCM) were used as building blocks…
Based on a numerical ab initio study, we discuss a structure model for a broad boron sheet, which is the analog of a single graphite sheet, and the precursor of boron nanotubes. The sheet has linear chains of $sp$ hybridized $\ensuremath{\sigma}$ bonds lying only along its armchair direction, a high stiffness, and ani…
In this work, a template-free synthetic approach for generating single-crystalline hollow nanostructures has been described. Using the small optical band-gap cuprous oxide Cu(2)O as a model case, we demonstrate that, instead of normally known spherical aggregates, primary nanocrystalline particles can first self-aggre…
'Scanning Transmission Electron Microscopy' published in 'Handbook of Microscopy for Nanotechnology'
The Harshaw Model 6600 Plus is a reader with a capacity for 200 TLD cards or 800 extremity cards. The new unit integrates more functionality, and significantly automates the QC and calibration process compared to the Model 6600. The Model 6600 Plus was tested against the IEC 61066 (1991-2012) procedures using Harshaw…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Molecular dynamics simulations of grain boundary (GB) migration of a bcc metal, tungsten, have been carried out. The GB is of asymmetrical ⟨ 110⟩ tilt type. Detailed examinations of atomic processes in the migration, show that the GB migration consists mainly of GB dislocation glides. Furthermore, each motion of a GB…
Based on a concept of molecular-level strain energy concentration and a kinetic fracture model, the time-dependent fracture behavior of three different types of single-walled carbon nanotubes (zigzag, armchair, chiral) with or without Stone-Wales (SW) defects were studied. It is found that the SW defects have influenc…
Diffraction of TM-polarized Gaussian beams by N equally spaced slits (finite grating) in a planar perfectly conducting thick screen is treated. We extend to the TM polarization case the results of a previous paper where the TE polarization was considered. The far-field diffraction patterns, the transmission coefficien…
We report a chemical route to synthesize oriented arrays of conducting polyaniline (PANI) nanotubes (60–150 nm in diameter and a few micrometres in length) by hydrogen-bonding directionality in the presence of a crown ether derivative (CE-SO 3 K) and ammonium persulfate (APS) in HCl solution. The morphology of the ori…
'High-Resolution Scanning Electron Microscopy' published in 'Handbook of Microscopy for Nanotechnology'
Synthetic monoclinic orpiment was recrystallized by annealing the glass at 523 K for 1 year. The apparent heat of fusion of orpiment at T fus = 601 K (onset) was found to depend linearly on the ratio V / m ( V = inner volume of the sample pan, m = in-pan sample mass) because of partial sublimation. This gives Δ fus H…
Power law resistivity behavior in 2D superconductors across the magnetic field-tuned superconductor-insulator transition, G. Sambandamurthy, A. Johansson, E. Peled, D. Shahar, P. G. Björnsson, K. A. Moler
Chemical solution deposition (CD) of PbSe takes place either by the cluster mechanism (nanocrystalline films) or by the ion-by-ion mechanism (films comprised of larger crystals). In this work we present a real time diagnostic method for determining the active deposition mechanism in CD of PbSe films using laser scatte…
Using computer simulations, we establish an approach for creating defect-free, periodically ordered polymeric materials. The system involves ABC ternary mixtures where the A and B components undergo a reversible photochemical reaction. In addition, all three components are mutually immiscible and undergo phase separat…
The optical properties of indium nitride nanorods grown by chemical-beam epitaxy are investigated by photoluminescence (PL) and Raman spectroscopy. The PL peaks show a blue shift from 0.69 to 0.79 eV, which is associated with a decrease in the size of the nanorods from 40 to 5 nm. Judging from the Raman spectra and tr…
Abstract A toughened, semiconductive polyaniline/polyurethane (PANI/PU)‐epoxy nanocomposite was prepared using a conductive polymer, PANI, and a PU prepolymer‐modified diglycidyl ether of bisphenol A (DGEBA) epoxy. The formation of a nanostructure was confirmed by Fourier transform infrared spectroscopy and SEM. The m…