Materials Literature
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Abstract A large variety of functional groups (i.e. carboxyl, carbonyl, aldehyde, alcohol) – representing the different oxidation states of carbon – can be produced by oxidative treatment of single walled carbon nanotubes (SWCNTs), depending on duration and temperature of the process. For subsequent functionalization…
Recent research has shown that a phase transformation of diamond to a different form of carbon is involved when diamonds are polished in the traditional fashion. The question as to how this phase transformation is activated and maintained to produce high wear rates is of great technological interest since it may radic…
Abstract Summary: The phase relaxation behavior of chitosan and its blends with glycerol has been studied by dynamic mechanical thermal analysis (DMTA) and differential scanning calorimetry (DSC) techniques. The analysis of DMTA spectra of chitosan leads to recognition of two molecular relaxations in chitosan and its…
Carbon nanotubes will only have a significant impact when they can be produced with uniform properties.
Aqueous solutions of poly(ethylene glycol) (PEG) of mean molecular mass of 600 g/mol (PEG600) are investigated by Brillouin scattering technique. At high PEG content, a relaxation phenomenon is observed, which is related to a local rearrangement of the polymer structure where the interaction, via hydrogen bonding, wit…
Ba 4 YMn 3 O 11.5, a 12R hexagonal perovskite that consists of face-sharing Mn 3 O 12 trimers isolated by single YO 6 octahedral layers, is presented. The presence of locally 5- and 6-coordinated Y 3+ and Mn 4+ cations is observed in this structure. A high dielectric permittivity (ε r ≈ 1 × 10 4 ), which is almost fre…
The purpose of this paper was to compare physical properties of conventional particleboard bonded with amounts of UF and PMDI resin and to examine the effect of mat moisture content (MC), wax content and platen temperature on their bonding efficiency, as determined by internal bond strength. It was found that PMDI not…
Abstract The massless Dirac particle moving at the speed of light has been a fascinating subject in relativistic quantum physics. Nanoscale graphitic materials, such as carbon nanotubes and graphene, now provide us with an opportunity to investigate such exotic effects in low‐energy condensed matter systems. The uniqu…
In aqueous suspension, the affinity of many pesticides for smectites is influenced by the clay properties such as surface area, surface charge density and location, exchangeable cations, and hydration status of exchangeable cations in clay interlayers. The amount and the type of salts present in the aqueous phase infl…
The internal nanostructure resulting from microphase separation in triblock copolymer films of polyparamethylstyrene-block-polystyrene-block-polyparamethylstyrene, P(pMS-b-Sd8-b-pMS), has been investigated with grazing incidence small angle neutron scattering (GISANS). X-ray reflectivity, grazing incidence small-angle…
[reaction: see text] Aryl coumaryl ethylenes undergo oxidative photocyclization readily to yield helical pyrone-annulated condensed aromatics. The pyrones are conveniently converted to the corresponding photochromic diphenylpyrans/chromenes. Both pyrones and chromenes exhibit helicity-dependent fluorescence efficiency…
This paper concerns the electrochemical growth of compound semiconductor thin film superlattice structures using electrochemical atomic layer deposition (ALD). Electrochemical ALD is the electrochemical analogue of atomic layer epitaxy (ALE) and ALD, methods based on nanofilm formation an atomic layer at a time, using…
Supramolecular fillers were incorporated in a poly(ε-caprolactone)-based polyurea in a modular approach via a “perfect-fit” principle. DSC and AFM studies both support the same model in which the bis(ureido)butylene-based filler molecules are incorporated into the bis(ureido)butylene hard segment domains of the polyme…
A simple sensor platform consisting of an interdigitated electrode (IDE) pattern has been fabricated for sensing gas and organic vapors. Purified single-walled carbon nanotubes (SWNTs) in the form of a network laid on the IDE by solution casting serve as the sensor material. The electrical conductivity of the SWNT net…
The aim of the experiment was to determine the influence of colloidal silver nanoparticles on the development of chicken embryos, particularly on the bursa of Fabricius. Silver nanoparticles (10 ppm) were injected into fertilized chicken eggs on days 5, 11 and 17. Ag nanoparticles did not influence embryo development…
Hot-wall epitaxy and molecular-beam epitaxy have been employed for growing quaterthiophene thin films on the (010) cleavage face of potassium hydrogen phthalate, and the results are compared in terms of film properties and growth mode. Even if there is no geometrical match between substrate and overlayer lattices, the…
Identifying how enzymes stabilize high-energy species along the reaction pathway is central to explaining their enormous rate acceleration. beta-Phosphoglucomutase catalyses the isomerization of beta-glucose-1-phosphate to beta-glucose-6-phosphate and appeared to be unique in its ability to stabilize a high-energy pen…
The properties of a carbon nanotube are dependent on its atomic structure. The atomic structure of a carbon nanotube can be defined by specifying its chiral indices, ( u , v ), that specify its perimeter vector (chiral vector), with which the diameter and helicity are also determined. The fine electron beam available…
Reported is the capacitive behavior of homogeneous and well-defined surfaces of pristine carbon nanofibers (CNFs) and surface-modified CNFs. The capacitances of the well-defined CNFs were measured with cyclic voltammetry to correlate the surface structure with capacitance. Among the studied pristine CNFs, the edge sur…
We use a model material of polystyrene blended with surface-modified cadmium selenide nanoparticles to investigate the interaction between polymer molecules and nanoparticles during the process of crazing. We demonstrate that nanoparticles undergo three stages of rearrangement during craze formation and propagation in…