Materials Literature
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Three new diatoms from North American rivers are described: Staurosira reimeri, Staurosirella elegantula and Staurosirella magna. The features of these diatoms are distinctive, and although they are reported here for the first time, misidentifications and lumping with other taxa in the past are likely. The finding of…
Recent studies show that carbon nanotubes (CNTs) can be used as temperature sensors, and offer great opportunities towards extreme miniaturization, high sensitivity, low power consumption, and rapid response. Previous CNT based temperature sensors are fabricated by either dielectrophoresis or piece-wise alignment of r…
In this paper, we investigate the upper limit performance of bilayer graphene (BLG) and graphene nanoribbon (GNR) field-effect transistors (FETs) based on a first-principles approach. We have found that GNR-FETs with ribbon widths of about 3–4 nm exhibit better device performance than n-channel Si metal–oxide–semicond…
The paper presents the results of a study of the formation and decay of lattice defects in wide band-gap optical crystals of LiB 3 O 5 (LBO), Li 2 B 4 O 7 (LTB) and Li 6 Gd(BO 3 ) 3 (LGBO) with a sublattice of mobile lithium cations. By means of thermoluminescence techniques, and luminescent and absorption optical spe…
Poly(vinyl alcohol) (PVA) is a polyhydroxyl polymer with many excellent properties and wide uses. However, its applications are based on and limited in wet process due to its very close melting point and decomposition temperature. In this paper, based on the thermal processing technology of PVA developed in the State…
The dehydration-rehydration process in gmelinite-Na |Na 7.27 K 0.28 Ca 0.15 (H 2 O) 21.85 |[Al 7.71 Si 17.24 O 48 ]- GME, a natural zeolite that can be described as a parallel stacking of double six rings of tetrahedra in the AABB sequence, was studied by X-ray diffraction data. Its space group is P6 3 /mmc with a = 1…
Abstract The EPR spectra of new paramagnetic copper(II) complexes generated by the photolysis of [(RH)4N+]2[CuIICl4]2– were identified,and a quantitative study of the dynamics of photochemical product formation and interconversions at 77–110 K was carried out.
Electronic structure methods were used to calculate the gas and aqueous phase reaction energies for reductive dechlorination (i.e., hydrogenolysis), reductive β-elimination, dehydrochlorination, and nucleophilic substitution by OH− of 1,2,3-trichloropropane. The thermochemical properties ΔH(f)°(298.15 K), S°(298.15 K,…
This paper reports on the results of the investigation of the relation between the magnetic microstructure and ferromagnetic resonance (FMR) in ferromagnetic metal-insulator composites by using granular alloys (Co41Fe39B20) x (SiO2)1 − x and Co x (SiO2)1 − x as an example. A comparative analysis of the properties of F…
Diffraction from 1D multilayer gratings having arbitrary border profiles including edges is considered for small wavelength-to-period (λ/d) ratios, the most difficult case for any rigorous numerical method. The boundary integral equation theory is so flexible that we can indicate a few areas where it can be modified.…
Polymer nanocomposite materials have attracted increasing attention because of their unique optical properties. Of practical interest is the controllable increase in the refractive index (RI) values of the polymer nanocomposite materials by using nanoparticle inclusions with high refractive index values. This paper pr…
Correlations between the stability of blue phases and the physical parameters of liquid-crystal hosts are reported in this study. Experimental results show that liquid-crystal blue phases are more thermostabilized when the dielectric anisotropy is reduced or the elastic constants increased. These correlations can be e…
Shishes are fibrillar crystallites that can be created by deforming a polymer melt. The formation of shishes takes place when flow is strong enough to stretch molecules. In the early stages, bundles of stretched molecules with pre-crystalline order form metastable precursors whose stability depends on their size and,…
The delivery of drugs to the CNS is hampered by the existence of the blood-brain barrier (BBB). Nowadays, medicinal chemists follow defined rules for the development of drugs able to cross the BBB. At the same time, the parameters needed in order to gain valuable estimates of brain drug delivery are well defined. Desp…
Abstract An analytical distribution function characterising the grain sizes of polycrystalline microstructures is presented. Contrary to standard mathematical probability functions that are still often used for description of experimentally obtained size distributions, this one is based on a statistical mean-field the…
The influence of fire retardants on compressive strength and fire behaviour of rigid polyurethane foams was studied. The flame retardants studied included ammonium polyphosphate, melamine cyanurate, aluminum trihydrate, borax, and expanded graphite. The Limited Oxygen Index (LOI) showed that ammonium polyphosphate was…
In the present work, we report the performance of grapheme-based gas sensors. Monolayer quality graphene was synthesized using thermal chemical vapor deposition. Graphene was characterized using Raman spectroscopy and Transmission electron microscopy. In addition, Hall Effect experiments were conducted to study the el…
10.2217/nnm.10.112
The thermolysis of urea-water solution and its product, HNCO hydrolysis is investigated in a dual-reactor system. For the thermal decomposition below about 1073 K, the main products are ammonia (NH 3 ) and isocyanic acid (HNCO) whereas at higher temperatures the oxidation processes take effect and the products include…
Different phases of boron nitride (BN) nano-structures are synthesized from an hBN ceramic target immersed in acetone, by ablation with a high power pulsed Nd: YAG laser. Transmission electron microscopy (TEM) and electron diffraction (ED) are used to identify the morphology and structure of the prepared colloidal sus…