Materials Literature
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Thermally stable mesoporous silica molecular sieves with wormhole framework structures, previously obtainable only from silicon alkoxides, have been prepared from low cost soluble silicate precursors in the presence of non-ionic surfactants as structure directors.
Anomalously high coercive field magnets with large remanence magnetizations have been prepared from electron-transfer salts of tetracyanoethylene and MnII(porphyrin). These magnets exhibit metamagnetic-like behavior at low temperature but, anomalously, show hysteresis with a large remanent magnetization. Metamagnets t…
The sintering characteristics and the reaction of additives with BaTiO 3 (BT) were examined for two materials having Nb‐rich composition (Comp.N) and Co‐rich composition (Comp.C) to elucidate the relation between the stability of the core–shell microstructure and the Nb/Co ratio in the BT–Nb 2 O 5 –Co 3 O 4 system. TE…
Nitinol is a very attractive material for manufacturing minimally-invasive therapy devices and tools because of its unique superelasticity and shape-memory properties. While several studies have shown it to possess good biocompatibility, its high nickel content and possible dissolution during corrosion still remain a…
Heterometallic compounds comprising copper(II) and rare-earth cations with carboxylate groups of the 2,2′-oxydiacetato as the connecting ligands, have been investigated. Five isostructural polymers [{Cu3Ln2(oda)6(H2O)6}·12H2O]n (Ln = Y (1), Gd (2), Eu (3), Nd (4) and Pr (5)) have been obtained and their structures det…
A series of lactic/glycolic acid polymers with various molar ratios of lactic to glycolic acid and various molecular weights were synthesized using the ring-opening polymerization method. The polymerization conditions for the lactic/glycolic acid polymer synthesis were as follows: 150 degrees C, 700 microm Hg, 3 h, 0.…
Nonisothermal melt and cold crystallization kinetics of poly(aryl ether ketone ether ketone ketone) (PEKEKK) were investigated by differential scanning calorimetry (DSC). The Avrami equation modified by Jeziorny could only describe the primary stage of nonisothermal crystallization kinetics of PEKEKK. Also, the Ozawa…
A 54-ferrocene dendrimer is synthesized by a convergent route and can be used to modify a Pt electrode in CH2Cl2; it can be reversibly oxidized in DMF in a single 54-electron wave (and with NO+).
The use of polypeptide models has proved to be a valuable tool to obtain accurate information on the collagen triple helix. Here we report the high resolution crystal structure of a collagen-like polypeptide with repeating sequence Pro-Hyp-Gly. The structure has been refined to an R(factor) of 0.137 and an R(free) of…
In high‐temperature solid oxide fuel cells where natural gas is used as a fuel, high‐carbon‐activity environments can be encountered in the anode compartment. Under these conditions, nickel could corrode by a process known as metal dusting. In the present study, metal dusting corrosion of pure nickel is simulated in h…
Composites of polypyrrole (PPy) with electrical and ferromagnetic behaviors were synthesized by a chemical method in the presence of p-dodecylbenzene sulfonic acid sodium salt (NaDS) as a surfactant and dopant. The magnetic properties of the resulting composites showed ferromagnetic behavior, such as high saturated ma…
Cellulose is a native polymer, the most abundant on Earth, with an extended structure involving β-1,4-glucosidic linkages between the anhydroglucose repeating units. This is explained by the presence of three hydroxyl groups with different polarities, secondary OH at the C-2, secondary OH at the C-3 and primary OH at…
Almost from the dawn of the nuclear age, mankind has had to face the problem of immobilising highly radioactive nuclear waste. Borosilicate glasses have shown that they have a unique blend of processing and product characteristics which make them nearly ideal for this application. In the United States the Defense Wast…
As the surface properties of polymeric biomaterials play an important role in the performance of biomedical devices, highly hydrophilic, ultrathin coatings were applied onto hydrophobic, perfluorinated and organosilicon polymers by the covalent immobilization of polysaccharides using a reductive amination reaction. Ga…
Chromated‐epoxy primers are often used for corrosion control of iron and aluminum structural alloys. However, due to environmental concerns and adverse health effects surrounding such use of chromates, there is an intensive effort to find suitable replacements for chromate‐based coatings. This effort is hampered by la…
The trend in both military and commercial markets for greater affordability has prompted the electromechanical designer toward higher speed and higher operating temperature devices. New magnetic materials are essential for the success of many of these power generation, distribution, and utilization systems. This manus…
Abstract A new concept has been developed in order to achieve a new generation of smart materials, namely purpose-built materials, modeled and designed to match the physical and structural requirements of their applications. A model based on the thermodynamic monitoring of the nucleation, growth, and aging process of…
A one-dimensional chain [MnII2(L)2(H2O)][MoIV(CN)8]·5H2O 2 (L = 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo[12.3.1]octadeca-1(18),2,12,14,16-pentaene, macrocyclic ligand) has been prepared from the reaction of K4[MoIV(CN)8]·2H2O 1 with the complex [MnIIL(H2O)2]Cl2·4H2O and its structure and photomagnetic properties have…
Blends of styrene–butadiene rubber (SBR) and natural rubber (NR) were prepared and their morphology, transport behavior, and dynamic mechanical and mechanical properties were studied. The transport behavior of SBR/NR blends was examined in an atmosphere of n-alkanes in the temperature range of 25–60°C. Transport param…
A mesoporous form of titanium phosphate has been prepared by reaction between phosphoric acid solution and either titanium propoxide or titanium chloride in the presence of trimethylammonium surfactants. The surfactant can be almost completely removed by extraction using acidified ethanol. The surface area of the extr…