Materials Literature
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Novel polymer biomaterials, which can be used in contact with blood, are prepared with strong inspiration from the surface structure of biomembrane. That is, the polymers with a phospholipid polar group in the side chain, 2-methacrylooyloxyethyl phosphorylcholine (MPC) polymers were synthesized. The MPC polymers can i…
The interlaminar stresses are confined to a region near the free edge. Therefore, the laminate stacking sequence and the free edge finishing are some of the factors that affect the strength of the laminate and limit its life. The use of molded edges eliminates the need for trimming and machining the laminates edges th…
Two types of duplex stainless steels were deformed by torsion at a temperature range of 900 to 1200 °C and strain rate of 1.0 s-1 and their final microstructures were observed. The austenite volume fraction of steel A (26.5Cr - 4.9Ni - 1.6Mo) is approximately 25% at room temperature, after conventional annealing, whil…
Gallium solubility in the Bi12TiO20 (BTO) matrix was investigated by solid state reaction synthesis and Bi12Ti(1-x)Ga xO20 (BTGaO) single crystals were grown by Top Seeded Solution Growth (TSSG). We determined that it is possible to obtain a continuous solid solution from (x)Bi12TiO20: (1-x)Bi12[Ga0.7Bi0.3]O20 and tha…
Evaluations of the fracture toughness in metal matrix composites (Duralcan reinforced with 15% of Al(2)0(3) and SiC) are presented in this work. The application of Elastic Plastic Fracture Mechanics is discussed and the obtained values are compared with the ones obtained by means of Linear Elastic Fracture Mechanics.…
Tetrathiafulvalene (TTF) and 7,7,8,8-tetracyano-p-quinodimethane (TCNQ) are included in the pores of the zeolite Y framework structure (NaY), each species individually and both together as charge-transfer complexes by absorption from the liquid phase. The positions of these guest molecules are determined by powder dif…
The K and L2,3 absorption edges and core-level binding-energy shifts for pure Co, Cu and Pt and Co–Pt and Cu–Pt alloys are measured to investigate changes in electronic structures of these alloys. Enhancements and depletion of the white lines in the alloys as compared to pure elements were correlated with changes in t…
Seven dental ceramic compositions, including zirconia, glass-infused alumina, polycrystalline alumina, porcelain and three different machinable glass ceramics (MGC's) were tested for edge flaking. The chosen load range encompassed the forces typically associated with machining operations for these materials. The resul…
The effects of laundering and laundering temperatures on surface properties and dimensional stability are investigated for plain flat knit silk, cotton, and polyester fabrics with varying cover factors. The fabrics are subjected to relaxation processes and an extended series of wash and tumble-dry cycles in laundering…
Cyclic deformation experiments by the Mughrabi–Ackermann technique (predeformation with plastic shear-strain amplitude εpl0⁄2=1×10−3 at 530 K till saturation) have been performed on a molybdenum single crystal of ultra-high purity (residual resistivity ratio RRR0≈4×105; angle χ=29° between the plane of maximum resolve…
Mechanical activation, without any additional heat treatment, is used to trigger the formation of a perovskite BaTiO 3 phase in an oxide matrix that consists of BaO and TiO 2 in a nitrogen atmosphere. The resulting BaTiO 3 powder exhibits a well‐established nanocrystalline structure, as indicated by phase analysis usi…
The effect of Zr content on the microstructure and magnetic properties of Sm(CobalFe0.1Cu0.088Zrx)8.5 magnets with x varying from 0 to 0.1 was systematically studied using magnetic, x-ray diffraction, and transmission electron microscopy measurements. The results have revealed that addition of Zr greatly affects the m…
Abstract Dendrimers are macromolecular, nanoscale objects that are widely recognized as precise, mathematically defined, covalent core-shell assemblies. As such, they are composed of quantized numbers of atoms, monomers, and terminal functional groups relative to the respective shell levels (generations) surrounding t…
Electrochemical properties of polypyrrole films grown in acetonitrile solutions at gold electrodes modified with thiolated β‐cyclodextrin (β-CD) self‐assembled monolayers (SAMs) have been investigated using cyclic voltammetry, electrochemical impedance spectroscopic measurements, and scanning electron microscopy. The…
Oil palm empty fruit bunch–polypropylene (EFB-PP) composites have been produced using a twin-screw extruder as the compounding equipment. Two levels of EFB were employed, 40 % and 60 % of the total weight of the sample. Three types of coupling agent, maleic anhydride-modified polypropylene (commercial name Epolene E-4…
The reaction of organolithium reagents with 5,15-disubstituted porphyrins, followed by hydrolysis of the intermediate anion to give a porphodimethene and oxidation with DDQ allows the facile preparation of 5,10,15-tri- and 5,10,15,20-tetrasubstituted porphyrins with mixed meso substituent types. Easily available 5,15-…
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Fibrous collagen networks are the major elements that provide mechanical integrity to tissues; they are composed of fiber forming collagens in combination with proteoglycans and elastic fibers. Using uniaxial incremental tensile stress–strain tests we have studied the viscoelastic mechanical properties of self-assembl…
Abstract It has been found that the bimetallic nanoclusters often have so-called core/shell structure if they are prepared by alcohol-reduction of two kinds of noble metal ions in the presence of a water-soluble polymer like poly(N-vinyl-2-pyrolidone)(PVP), and that the core/ shell structured bimetallic nanoclusters h…
C-S-H samples were precipitated from aqueous solution containing Ca(NO 3 ) 2 and Na 2 SiO 3 with an initial Ca/Si molar ratio of 1·3, when the pH value in the solution was varied by adding HNO 3 or NaOH. A pH > 10·9 was required to obtain quasi-crystalline C-S-H, and the CaO/SiO 2 ratio of the precipitate was incre…