Materials Literature
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The graft copolymerization of styrene and acrylonitrile onto natural rubber was prepared by emulsion polymerization using potassium persulfate as an initiator. The effects of initiator concentration, reaction temperature, and pressure on monomer conversion and the grafting properties of natural rubber are investigated…
Soils contaminated with lead pose significant risk to human as well as terrestrial and aquatic ecosystems. Theoretical phase relationships and field observations suggest that the interaction of lead and phosphorus to form pyromorphites Pb5(PO4 )3 X (X= OH-, Br-, Cl-, or F-) is an important buffer mechanism controlling…
Porous silica-pillared montmorillonites were prepared by simultaneous intercalation of dodecylamine-TEOS [tetraethylorthosilicate, Si(OC2H5)4] into the H-montmorillonite and intragallery amine-catalyzed hydrolysis of TEOS. Mixtures of the H-montmorillonite, dodecylamine and TEOS at molar ratios of 1 : 2 : 15-30 and 1…
The calcification potential, biostability, and immunogenic response of materials intended for long-term in vivo use, such as in heart-valve bioprostheses, are essential components of device performance. Here we explore these properties in photooxidized porcine heart valves. To study immunological sensitization, we inj…
Steric protection of a trisilanol silsesquioxane (also referred to as a silasesquioxane) by one TBDMS group (SiMe2But) generated a new siloxanolate ligand, (c-C5H9)7Si7O9(OH)2(OTBDMS) 1, that allows only restricted access to a co-ordinated metal. Lithiation afforded the stable complex (c-C5H9)7Si7O9(OLi)2(OTBDMS), whi…
The development of efficient photo-induced DNA cleavage agents has been of particular interest for biomedical applications such as cancer photodynamic therapy (PDT). Toward this objective, we synthesized a series of cationic bis-porphyrins with various lengths of diamino alkyl linkage, N,N'-bis[4-[10,15,20-tris(1-meth…
A novel donor-type metal–dithiolene complex, Ni(edo)2 [edo = 5,6-dihydro-1,4-dioxine-2,3-dithiolate], and its mixed-ligand derivatives were synthesized and characterized. Their improved solubility and donor abilities have been confirmed. They provide various types of radical cation salts which exhibit novel donor arra…
We report an experimental study of the shape of large liquid drops spreading on surfaces with patterns of wettability. The patterns are sets of disks of a material less wettable than the rest of the plane substrate. When few defects are present, or when the average distance between defects is large compared to the cap…
Thermal properties and flammability behavior of two grades of fire retardant polypropylene and nylon 66, and their base resins were determined. A nylon 6 base polymer and a nano-composite based on that polymer were also analyzed. Thermal gravimetric analysis showed more complex degradation patterns for the fire retard…
Immobilization of the anticoagulative or antithrombogenic biomolecule has been considered as one of the important methods to improve the blood compatibility of artificial biomaterials. In this study, a novel immobilization reaction scheme was utilized to incorporate the human thrombomodulin, an endothelial cell associ…
This research investigated the structural changes that occur on different polyethylene polymer systems as a result of a novel pulverization process called solid-state shear pulverization (S3P). High-density polyethylene, low-density polyethylene, and two forms of linear low-density polyethylene were run through a pulv…
The photophysical properties and isomerization of 3,3′-diethylthiacarbocyanine (DTC) were studied in isooctane/sodium bis(2-ethylhexyl)sulfosuccinate (AOT)/water reverse micelles and in aqueous solutions containing sodium dodecylsulfate (SDS), cetyltrimethylammonium bromide (CTAB) and chloride (CTAC) and Triton X-100…
In this study, in order to obtain the high deformability of magnesium alloy sheets, effects of the combination of rolling and heat treatments on mechanical properties and crystallographic textures in AZ31 magnesium alloy sheets were examined. The main results were as follows, (1) At all rolling conditions, the best me…
The properties of high-quality CdO films formed by low-pressure chemical vapor deposition are reported for the first time. The relationships between deposition parameters, thin-film formation, and material properties are investigated. CdO films are formed between 100 and 450°C, using a dimethylcadmium precursor and ox…
The characteristics of high temperature deformation in Mg–Y alloys were investigated and compared with those of pure Mg. The effect of Y on slip and twinning deformations was also discussed in respect to the lattice parameter with temperature. Pure Mg displays a gradual decrease in proof stress with increasing tempera…
Short sisal fiber-reinforced styrene butadiene rubber (SBR) composites were prepared and characterized by the restricted solvent swelling technique. The solvent swelling characteristics of SBR composites containing untreated and bonding agent-added mixes were investigated in a series of aromatic solvents, such as benz…
The transport properties of d-limonene through ethylene vinyl alcohol copolymers (EVOH) and nylon 6,6 films as functions of relative humidity (RH) and temperature were studied. Permeation properties of these polymers were strongly influenced by temperature and RH. Compared to the EVOH films, the nylon 6,6 film had muc…
The relevance of exothermic melting according to the Tammann loop-shape crystal phase boundary (A. L. Greer, Nature, 2000, 404, 134) is examined. It is proposed that combined effects of the crystal space group, free volume, anharmonicity, and configurational entropy may lead to volume and entropy decrease on melting.…
Corynebacterium glutamicum 3-deoxy-D-arabino-heptulosonate-7-phosphate (DAHP) synthase is sensitive to feedback inhibition by tyrosine. One feedback-insensitive mutant was obtained by in vitro chemical mutagenesis and the mutation was identified as a C-->G mutation at nucleotide 560 causing a Ser(187) to Cys(187) subs…
Mixed oxide materials belonging to the perovskite family (ABO3, LaCoO3) have come under intense scrutiny for their possible applications in different scientific and technological fields, such as heterogeneous catalysis, oxygen sensors, solid oxide fuel cells and magnetic media. The growing interest in such mixed oxide…