Materials Literature
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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…
The classic theory of Cabrera and Vermilyea (C-V) postulates that inhibition of crystallization by impurities is the result of pinning of step motion. Although generally accepted, the predictions of the C-V model have not been previously linked to studies of impurity adsorption in macroscopic crystallization systems.…
We have developed a spherical aberration corrected transmission electron microscopy ( C s -corrected TEM) technique that allows us to obtain clearer images in real space than ever before. We applied this technique to titanium oxide, in which light elements such as oxygen are difficult to observe using TEM because of i…
Abstract The effect of CdCl 2 , NiCl 2 and SnCl 2 on the morphology and on the structure of hot‐dip galvanized coatings was examined with optical microscopy, scanning electron microscopy and X‐ray diffraction, when these salts are added in the preflux bath. From this investigation it turned out, that the morphology of…
ErAl 3 (BO 3 ) 4 crystals were successfully grown by the slow-cooling method in a K 2 Mo 3 O 10 flux. The formation of ErAl 3 (BO 3 ) 4 crystals was greatly dependent on the solute concentration of starting mixtures, and mixtures containing a solute of 32−41 mol % produced ErAl 3 (BO 3 ) 4 crystals. The obtained ErAl…
Abstract A new route has been developed for preparing polyaniline (PANI) layered double hydroxide (LDH) nanocomposites through in situ chemical oxidative polymerization of metanilic anions ( m ‐NH 2 C 6 H 4 SO 3 – ) intercalated in NiAl LDHs under a nitrogen atmosphere by using pre‐intercalated nitrate as an oxidizing…
Abstract Metal (Cd 2+ and Cu 2+ ) substituted single crystals of Bis(thiourea) zinc chloride (BTZC) are grown by slow solvent evaporation technique, with the vision to improve the physicochemical properties of the sample. Single crystal XRD studies of both pure and doped samples are carried out and the results are com…
In this paper, we discuss the scattering behavior of two-dimensional hexagonal liquid crystals with micellar cylinders as a building unit. We treat the hexagonal phase as an accumulation of ordered domains of finite size that typically consists of one hundred parallel cylinders whose axes are perpendicular to the latt…
Thalassiosira species are common components of marine planktonic communities worldwide and are used intensively as model experimental organisms. However, data on life cycles and sexuality within the genus are fragmentary. A clone of the cosmopolitan marine diatom Thalassiosira punctigera Cleve emend. Hasle was isolate…
The mechanical properties of TiO 2 -derived nanoribbons were investigated by using a three-point bending method. Thin nanoribbons (cross-section dimension ∼30 nm) have an average Young's modulus of 260 ± 55 GPa. For thicker nanoribbons, which are composed of several thinner nanostrips, the bending modulus rapidly decr…
To evaluate the lubrication compatibility of SiC‐reinforced Ti 3 SiC 2 ‐based composites, i.e., a Ti 3 SiC 2 /SiC composite, with water and alcohol, sliding experiments were conducted under dry condition and lubricated with water and C 2 H 5 OH. The friction and wear of the Ti 3 SiC 2 /SiC composite decreased in the o…