Materials Literature
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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…
A fluorinated multiwalled carbon nanotube (FMWNT) was prepared by reaction of 3-perfluorooctylpropylamine with carboxylic acid groups on the oxidized carbon nanotube surface. The modification was confirmed by TGA, TEM, and solubility tests in a perfluorodecalin solvent. Nanocomposite fibers based on FMWNT and a fluoro…
Higher electrical resistivity is observed in metals when dimensions approach the mean free path of the electrons. The effects of electron scattering at surfaces and at grain boundaries are then becoming substantial. This issue has been extensively studied on thin films but rarely on wires, where both small dimensions…
We synthesized CdSe/CdS/ZnS core/multi-shell nanocrystals through a single coating step by using different growth rates of CdS and ZnS crystalline layers on CdSe cores. The resulting nanocrystals exhibited a controlled redshift from the initial photoluminescent (PL) emission of CdSe cores with much improved quantum yi…
The structural features and thermal conductivity of silicon nanoparticles of diameter 2–12 nm are studied in a series of molecular dynamics simulations based on the Stilling–Weber (SW) potential model. The results show that the cohesive energy of the particles increases monotonically with an increasing particle size a…