Materials Literature
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In this communication, a new method for the deaggregation of detonation nanodiamond (ND) and some preliminary results using this method are presented. ND is firstly graphitized in nitrogen at 1000°C and then oxidized by air at 450°C to remove the surface graphite layer formed. The sample after such treatment was suspe…
Microbeads that are both paramagnetic and fluorescently labeled are commercially available in colors spanning the visible spectrum. Although these commercial beads can be bright, polydispersity in both size and fluorescent intensity limit their use in quantitative assays. Very recently, more monodisperse beads have be…
Hexagonal mesoporous silica materials (PHTS) are synthesized with a high TEOS/EO 20 PO 70 EO 20 ratio containing microporous nanocapsules or plugs inside the mesoporous channels. This PHTS material exhibits a tunable amount of open and plugged pores, has a high micropore volume (up to 0.24 mL/g), and is more stable th…
In recent years, there has been increasing recognition that a number of synthetic polymers which have excellent biodegradability and biocompatibility are materials of pharmaceutical importance in the area of drug delivery technology. The aim of this review is to take a closer look at a few synthetic polymer-based drug…
Hybrid yarns have reinforcing and matrix-forming filaments combined together in order to reduce the problems associated with high melt viscosity of thermoplastic matrices. Among hybrid yarns, commingled and air-textured yarns, which are produced with air jets have demonstrated high flexibility and good mixing of const…
We report the infrared-to-visible upconversion luminescence of Er3+-doped lead–niobium–germanate glasses (GeO2–PbO–Nb2O5) with different Er2O3 concentrations (0.5, 1, 2, and 3 wt.%) under continuous-wave and pulsed-laser excitation in the near-infrared region inside the 4I9/2 level. Intense green emission due to the (…
The effects of iron content on the microstructure and crevice corrosion of Grade-2 titanium (Ti-2) were studied using a galvanic coupling technique combined with optical microscopy and secondary ion mass spectrometry (SIMS) imaging. This study reveals that iron content has a significant effect on the microstructure an…
Poly(ethylene glycol) (PEG) films were covalently coupled to silicon surfaces using a solution phase and a vapor phase technique. These methods are targeted for creating nonfouling PEG films on silicon bio-microsystems. We used X-ray photoelectron spectroscopy (XPS) to better understand and analyze PEG functionalized…
The role of gravity in the phase behaviour of mixtures of hard colloidal plates without and with non-adsorbing ideal polymer is explored theoretically. By analyzing the (macroscopic) osmotic equilibrium conditions, we show that sedimentation of the colloidal platelets is significant on a height range of even a centime…
The use of novel nanostructured materials for optical applications continues to be an important issue for the creation of new devices. New materials including metal nanoparticles have played an important role for applications in photonics, biology, as well as medicine. This review primarily concerns the use of one par…
To make full use of the strength of carbon nanotubes in a composite, it is important to have a high-stress transfer at the matrix−nanotube interface via strong chemical bonding. This paper investigates the possible polyethylene−nanotube bonding with the aid of a quantum mechanics analysis. The polyethylene chains were…
Human estrogenic 17beta-hydroxysteroid dehydrogenase (17beta-HSD1), a member of the short chain dehydrogenase/reductase (SDR) family, is responsible for the biosynthesis of all active estrogens. The crystal structures of two C19-steroid ternary complexes (17beta-HSD1-androstanedione-NADP and 17beta-HSD1-androstenedion…
Abstract An ellipsometric study was carried out in order to investigate the photoinduced change of the refractive index (Δ n ) of a series of diarylethenes across the entire spectral range 260–1700 nm. This technique allowed examination of the influence of the resonance conditions on the refractive index. Changing the…
The effects of total ionising radiation dose upon commercial off-the-shelf semiconductors fitted to satellites operating in low Earth orbit (LEO) conditions was evaluated. The evaluation was performed for the Korea Institute of Technology SATellite-1, (KITSAT-1) which was equipped with commercial solid state component…
The formation of reaction zone morphologies periodic in time and space can be considered as a manifestation of the Kirkendall effect accompanying interdiffusion in the solid state. In a diffusion-controlled interaction, the Kirkendall marker plane can bifurcate, which is attributed to diverging vacancy fluxes in the r…
A new family of glasses based on Bi2O3 was found in the systems xZnO · (0.30 − x)M2O · 0.70Bi2O3 (M = Li, Na) in the range 0.00 ≤ x ≤ 0.20 containing 2.0 mol% of V2O5. Density, molar volume, optical band gap and dc conductivity of these glasses have been investigated. The position of the absorption edge and hence the…
Mixed-layer illite/smectite (I/S) clays were analyzed from 22 deep exploration wells from the Jeanne d'Arc Basin on the Grand Banks offshore Newfoundland, the host of large commercial hydrocarbon accumulations discovered in the last two and a half decades. The fine fraction of the clays (<0.1 µm) consists mainly of…
Abstract In this paper, synthesis and characteristic of arylamine‐type molecules, particularly triphenylamine are discussed. An overview of the physical properties and chemical characteristics of these types of molecules is provided. Different synthesis methods and mechanisms involved for the production of these molec…
This paper summarizes the results of systematic studies of field electron emission from detonation nanodiamond coatings corresponding to nanodiamond powders of different modifications. The role of the chemical composition of the surface of detonation nanodiamond particles in field emission mechanisms is discussed. Fie…
The short-range order and electron structure of amorphous silicon nitride SiNx (x<4/3) have been studied by a combination of methods including high-resolution X-ray photoelectron spectroscopy. Neither random bonding nor random mixture models can adequately describe the structure of this compound. An intermediate model…