Materials Literature
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At room temperature the optical transport and magnetotransport properties of homo-epitaxial MPCVD diamond layers with boron contents in the 2 × 1020 to 2 × 1021 cm−3 range are expected to be governed by the characteristics of the boron impurity band. A comparison of room temperature infrared transmittance reflectance…
Surfaces with two‐dimensional nanoring or nanoporous arrays and nanopatterned SAMs have been fabricated via the “colloidal crystal‐assisted capillary nanofabrication” (CCACN) method. The Figure shows the two‐dimensional poly(vinyl alcohol) (PVA) nanoring arrays generated using a delicate template and the controllable…
Six benzimidazole derivatives were investigated as corrosion inhibitors on mild steel in 1 M hydrochloric acid (HCl) using gravimetric and polarization techniques. Inhibitor efficiency was found to depend on concentration and on the structure of the molecules. The results were interpreted by means of an adsorption mod…
The activity of chitosan and oligo-chitosan on several plant insects and pathogens were studied. Chitosan was active against lepidopterous and homopterous insects; the mortality was 80%. The insecticidal activity of chitosan to Plutella xylostella L. was higher than that to Spodoptera exigua Hübner. The mortality of s…
Proteins found in mineralized tissues act as nature's crystal engineers, where they play a key role in promoting or inhibiting the growth of minerals such as hydroxyapatite (bones/teeth) and calcium oxalate (kidney stones). Despite their importance in hard-tissue formation and remodeling, and in pathological processes…
Abstract A highly stable new electrochromic polymer, poly(1,4‐bis(2‐(3′,4′‐ethylenedioxy)thienyl)‐2‐methoxy‐5‐2″‐ethylhexyloxybenzene) (P(BEDOT‐MEHB)) was synthesized and its electrochemical and electrochromic properties are reported. P(BEDOT‐MEHB) showed a very well defined electrochemistry with a relatively low oxid…
Abstract Thermosensitive hollow capsules were successfully fabricated by the layer‐by‐layer deposition onto colloid particles of oppositely charged diblock copolymers each containing a poly( N ‐isoproprylacrylamide) (PNIPAM) block and by the subsequent decomposition of the core. The multilayer growth was characterized…
Outside mesoporous, inside macroporous. Mesoporous titania samples with an internal macroporous structure (see Figure) are reported to have been synthesized by a one‐step templating process. The materials have a thick shell and a sponge‐like macrostructured core with a uniform pore gradient. The synthesis conditions,…
Abstract Several substituted phenanthrolines (L = pyrazino[2,3‐ f ][1,10]phenanthroline (PyPhen), 2‐methylpyrazino[2,3‐ f ][1,10]phenanthroline (MPP), dipyrido[3,2‐ a :2′,3′ ‐c ]phenazine (DPPz), 11‐methyldipyrido[3,2‐ a :2′,3′‐ c ]phenazine (MDPz), 11,12‐dimethyldipyrido[3,2‐ a :2′,3′‐ c ]phenazine (DDPz), and benzo[…
Lead magnesium niobate-lead titanate 0.67Pb (Mg(1/3)Nb(2/3))O3-0.33PbTiO3 (PMN-0.33PT, abbreviated as PMN-PT) single crystals were used to fabricate PMN-PT/epoxy 1-3 composites with different volume fractions of PMN-PT ranging from 0.4 to 0.8. The electromechanical properties of the 1-3 composites were determined by t…
The seven conserved enzymatic domains required for tryptophan (Trp) biosynthesis are encoded in seven genetic regions that are organized differently (whole-pathway operons, multiple partial-pathway operons, and dispersed genes) in prokaryotes. A comparative bioinformatics evaluation of the conservation and organizatio…
The migration of different cell types, such as leucocytes and tumour cells, involves cellular strategies to overcome the physical resistance of three-dimensional tissue networks, including proteolytic degradation of extracellular matrix (ECM) components. High-resolution live-cell imaging techniques have recently provi…
Intertidal sediments are important areas that separate the land from the sea and form natural coastal defenses. They are known as highly productive ecosystems, fueling the coastal food web. It is also conceived that microphytobenthos contribute to the stability of intertidal sediments by increasing the erosion thresho…
An Al-7.6 at.% Mg alloy was ball milled in liquid N2 for 8 h and its microstructures were investigated using transmission electron microscopy. Electron diffraction confirmed that the resulting powder is a supersaturated Al-Mg solid solution with an fcc structure. Three typical nanostructures with different grain-size…
President Bush, during his State of the Union Address this year, pronounced a $1.2 billion jump-start to the hydrogen economy. The move would represent not only freedom from US-dependence on foreign oil, which is a national security issue, but also a necessary and gargantuan step toward improving the environment by re…
A special room‐temperature ionic liquid , 1‐hexadecyl‐3‐methyl‐imidazolium chloride, is used as a template to prepare monolithic super‐microporous silica with lamellar order (monolith in Figure) via a nanocasting technique. The silica walls of the synthesized product are arranged parallel to each other, displaying a r…
Abstract The focus of this research was to investigate the effect of thermal degradation upon the mechanical properties of a natural rubber compound. We examined both the quasi-static and dynamic mechanical properties of a natural rubber vulcanizate which had been subjected to isothermal, anaerobic aging. The thermal…
We performed a series of dynamic hysteresis measurements on Finemet films with composition Fe/sub 73.5/Cu/sub 1/Nb/sub 3/Si/sub 13.5/B/sub 9/, using both the longitudinal magneto-optical Kerr effect (MOKE) and the inductive fluxometric method. The MOKE dynamic hysteresis loops show a more marked variability with the f…
We found that the grain size of V2O5 thin films produced by pulsed laser ablation strongly influences their optical characteristics. The decrease in the optical band gap associated with a change in spectral transmittance of the pulsed laser deposited V2O5 films are mainly due to structure evolution from amorphous to c…
ABSTRACT: Internal and sensory quality of eggs coated with chitosan was evaluated during a 5‐wk storage at 25 °C. Three chitosans with high (HMw, 1100 KDa), medium (MMw, 746 KDa), and low (LMw, 470 KDa) molecular weight were used to prepare coating solutions. Coating with LMw chitosan was more effective in preventing…