Materials Literature
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Abstract Unvulcanized and vulcanized SBR samples with styrene content of 18 and 23.5% were used to investigate the effect of ultrasound treatment on their structural characteristics. Gel fraction and crosslink density of gel are measured. Molecular weight and molecular weight distribution of sol are studied to determi…
The copolymerization of N-Methylpyrrole (N-MPy) and N-ethylcarbazole (ECz) by chemical and electrochemical methods is investigated in detail. Random copolymers of poly[N-Methylpyrrole-N-ethylcarbazole], P[N-MPy-co-ECz], were synthesized in the presence of ceric ammonium nitrate (CAN) in acetonitrile. Electrocopolymeri…
Elastic deformations of homeotropic nematic liquid crystal layers subjected to a d.c. electric field were studied numerically in order to find the dependence of threshold voltage on the properties of such a system. A nematic material characterized by a negative sum of flexoelectric coefficients and by a small negative…
We present accurate calculations and tabulations of the volume and midplane-averaged complex ac susceptibilities of nonmagnetic conducting cylinders with aspect ratio ranging from 0.1 to 10 as functions of a dimensionless frequency. We discuss their features in terms of eddy-current demagnetizing effect. We explain th…
Abstract Cupric acetate dissolved in methanol was applied, for the first time, to the synthesizing of Y‐junction carbon nanotubes (CNTs). This was done by catalytic CVD of the methanol solution at 1000–1200 °C. Based on the bamboo structure, which was observed for the first time within Y‐junction CNTs, it is suggested…
Uma alumina de elevada pureza dopada com MgO foi sinterizada entre 1300 e 1700 °C para preparação de corpos com diferentes porosidades. Foram determinadas a resistência à flexão em quatro pontos, a tenacidade à fratura pelo método SEVNB, a dureza Vickers, as velocidades sônicas (longitudinal e transversal) e as consta…
A series of water-soluble tri-anionic and -cationic substituted phthalocyanines has been synthesized via iodinated boron subphthalocyanines. The latter were opened with differently substituted diiminoisoindolines via the Kobayashi ring expansion reaction followed by metal insertion to exclusively yield the asymmetrica…
Abstract A biodegradable, immiscible poly(butylenes adipate‐ co ‐butylenes terephthalate) [P(BA‐ co ‐BT)]/poly(ethylene oxide) (PEO) polymer blend film with compositional gradient in the film‐thickness direction has been successfully prepared in the presence of a low‐molecular‐weight compound 4,4′‐thiodiphenal (TDP),…
Some properties of the remarkable Ti3SiC2 based ceramic synthesised by hot pressing of elemental Ti, Si, and C powders have been investigated. Its flexural strength by using three point bending tests and fracture toughness by using single edge notched beam tests were measured at room temperature to be in the range 310…
Research Article| September 01, 2005 Valve development in the diatom family Asterolampraceae H. L Smith 1872 Mary Ann Tiffany; Mary Ann Tiffany 1Center for Inland Waters and Department of Biology, San Diego State University, San Diego CA 92182-4614, USA Search for other works by this author on: GSW Google Scholar Davi…
A series of cyclosiloxane‐based cholesteric liquid crystalline (LC) polymers were synthesized from a cholesteric LC monomer cholest‐5‐en‐3‐yl(3β) 4‐(2‐propenyloxy)benzoate and a nematic LC monomer butyl 4‐[4‐(2‐propenyloxy)benzoxy]benzoate. All the polymers exhibit thermotropic LC properties and show cholesteric phase…
Electron-paramagnetic-resonance (EPR) and photoluminescence (PL) studies on magnesium gallate (MgGa2O4) phosphor activated with divalent manganese have been carried out. The EPR spectrum exhibits a six-line hyperfine structure centered at g=1.995, which is a characteristic of a Mn2+ ion with a nuclear spin I=5∕2. The…
Four organic inhibitors namely 2-amino-1,3,4-thiadiazole (AT), 5-methyl-2-amino-l,3,4-thiadiazole (MAT), 5-ethyl-2-amino-1,3,4-thiadiazole (EAT) and 5-propyl-2-amino-1,3,4-thiadiazole (PAT) were synthesized and their influence on the inhibition of corrosion of mild steel (MS) in hydrochloric acid was investigated by w…
Three-dimensional (3D) microscopy is a new and rapidly expanding area. A DualBeam system, with both a focused ion beam (FIB) column and an electron column, is a powerful instrument for imaging and sectioning microstructures to generate a full 3D sample reconstruction. When an electron backscatter diffraction (EBSD) sy…
Structural and dielectric properties of epitaxial SrTiO3 (STO) thin films on LaAlO3 substrates fabricated by a two-step growth technique using pulsed laser deposition were investigated by in situ and ex situ observations in terms of strain relaxation from the lattice mismatch between the film and the substrate. In a f…
Abstract The use of polymeric materials for the administration of pharmaceuticals, and as biomedical devices has increased dramatically. This review focuses on synthetic biodegradable polymers of current interest for medical use, based on ester and anhydride bonds. Special attention is given to factors affecting biode…
O/W emulsions with liquid crystals are complex systems for the delivery of actives into the skin surface since they modulate the release rate in the structure, and they increase the stability and solubility of slightly soluble substances in oil or aqueous phase and support moisturing by decreasing the transepidermal w…
The dependences of electrical properties on (111) and (100) orientations were investigated for (Ba 0.5 Sr 0.5 )TiO 3 films with in-plane random (one-axis-oriented films) and aligned orientations (epitaxial films) prepared by RF magnetron sputtering. Epitaxial films with (100) and (111) orientations were grown on (100)…
Formate dehydrogenase (FDG) from methylotrophic bacteria Pseudomonas sp. 101 catalyzes the reaction of oxidation of the formate ion to carbon dioxide, which is accompanied by the reduction of nicotinamid adenine dinucleotide (NAD + ). The structures of the apo and holo (enzyme-NAD-azide triple complex) forms of the en…
To create a functionalizable and photopatternable biodegradable polyester, 2-hydroylethyl methacrylate (HEMA) grafted poly(ε-caprolactone- co -RS-β-malic acid) (PCLMAc) was synthesized. The ring-opening random copolymerization of ε-caprolactone (CL) and RS-β-benzyl malolactonate (MA) using stannous octoate catalyst wa…