Materials Literature
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Titanium alloy (Ti-6Al-4V) and cast cobalt-chromium-molybdenum alloy (CoCr) have a long history of successful clinical use. However, a higher strength material would be useful to manufacture certain implants, such as smaller hip-stems, with more extensive porous-coating to facilitate improved fixation. A new grade [hi…
Abstract During the fall and winter of 1995, ninety-two samples were collected from twenty-three sampling stations in the Matanza-Riachuelo river basin. Epipelic diatoms and physico-chemical parameters were studied to establish water quality. Ecological methodologies (species richness, diversity and saprobity indices…
Nanoparticles, one of the colloidal drug delivery systems, hold great promise for reaching the goal of controlled drug delivery as well as site specific delivery. This review presents various methods of preparation, characterization, stability, drug release and applications of nanoparticles. If appropriately investiga…
2‐Dioctylamino‐1,3,5‐triazine‐4.6‐dithiol (DO) was found to electrochemically polymerize on AZ91 (magnesium alloy) plates. This method of plating metals is called "polymer plating." An aqueous solution was selected for the polymer plating of triazine dithiols on magnesium alloy plates as an effective electrolytic solu…
The crystal structure of a covalently cross-linked Lactobacillus casei thymidylate synthase has been determined at 2.8 A resolution. The sites for mutation to achieve the bis-disulfide linked dimer were identified using the disulfide modeling program MODIP. The mutant so obtained was found to be remarkably thermostabl…
A neutron diffraction study of the crystalline structure and magnetic state of LaMnO 3+ δ samples with different deviations from oxygen stoichiometry has been made at 4.2 K. It is shown that annealing at reduced oxygen pressure is accompanied by transformation of the magnetic structure from ferromagnetic, with magneti…
Lead zirconate titanate thin films with a seed layer were successfully deposited on platinized silicon substrates by a modified sol-gel processing using a new zirconium source. The seed layer between the platinum bottom electrode and the PZT films could promote formation of perovskite phase and enhance the crystallini…
The tetradentate bis(dithiolate) ligands 1,4-bis[(2,3-disulfanylbenzamido)methyl]benzene H4L1 and 1,7-bis(2,3-disulfanylbenzamido)heptane H4L2 were prepared and converted into the dinuclear titanocene complexes [(TiCp2)2(L1)] 1 and [(TiCp2)2(L2)] 2, respectively. A ligand transfer reaction of 1 and 2 with [NR4]2[CoCl4…
From a simple calculation considering no thermodynamic requirement of maintaining uniform density, we estimated the effects of spatial confinement on the dielectric relaxation of model block copolymer chains having type-A dipoles. The results were utilized to discuss the relative importancc of these requirement and co…
Langmuir–Blodgett films have been fabricated from a regioregular poly(thiophene) derivative by the vertical dipping method while still maintaining the high self-organization associated with the regioregularity of the polymer.
Strong metal-ceramic bonds require thermodynamic adhesion with the formation of new phases at the interface when the system is reactive, or without the formation of new phases when the system is non-reactive. The copper-alumina system can be reactive or non-reactive depending on the oxygen content in the atmosphere an…
The first example of an enzyme catalysed modification of the backbone of a synthetic polymer is described. An immobilised lipase from Candida antarctica (Novozym 435) catalyses the selective epoxidation of polybutadiene in organic solvents in the presence of hydrogen peroxide and catalytic quantities of acetic acid. T…
The corrosion rate of gas condensate pipelines can be substantially reduced by increasing the pH artificially. The technique is called pH stabilization and has been used with success in gas condensate pipelines. The reduction is based on the precipitation of protective corrosion products on the steel surface. When cor…
The recent attempt to account for the existence of several magnetic phases in insulating perovskite manganites in terms of the interplay between the orbital and spin orders produced by the localized e g and t 2g electrons is extended to the metallic state which is obtained on doping. It is shown that the activation en…
The effect of adding silica to rubber compound on its adhesion to brass-plated steel cord was investigated. Silica reduced the curing rate and enhanced the physical properties of the rubber compound, especially after thermal aging, when 20 phr of silica was added. The pull-out force increased considerably with silica…
The question on the dominant driving mechanism (displacive or order-disorder) at each structural phase transition of KNbO3 is investigated by means of molecular dynamics simulations. To this purpose, we first develop a shell model by determining its potential parameters in order to reproduce the ferroelectric instabil…
A model of relaxation in supercooled and entangled polymer liquids is developed starting from an integral equation describing relaxation in liquids near thermal equilibrium and probabilistic modelling of the dynamic heterogeneity presumed to occur in these complex fluids. The treatment of stress relaxation considers t…
Abstract The crystal structures of synthetic KSb 5 S 8 and (Tl 0.598 , K 0.402 )Sb 5 S 8 were determined from single crystal X-ray diffraction data: space group Pn , Z = 4, a = 8.1374(5) Å, b = 19.5013(5) Å, c = 9.0620(6) Å, β = 91.932(5)° ( R = 4.11% for 5073 reflections), and a = 8.1148(9) Å, b = 19.425(3) Å, c = 9.…
Article Influence of Ti Substitution on the 29Si NMR Spectra of Silicalite. A Computational Study was published on January 1, 1999 in the journal Zeitschrift für Physikalische Chemie (volume 209, issue 1).
Among many attractive effects on physicochemical processes; one of the most promising applications of power ultrasound concerns crystallization. This paper is a review of the previous work on sonocrystallization. Ultrasound has been used in crystallization to initiate primary nucleation by narrowing the metastable zon…