Materials Literature
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Abstract The strong influence of relatively small amounts of filler particles, such as carbon black, on the mechanical properties of elastomers has been well known for decades and has significantly contributed to increased use of elastomeric materials in many commercial applications. Even though the use of fillers is…
Rietveld refinements using 12 sets of X-ray diffraction powder data from milligram samples of human dental enamel provide detailed information about the structure and composition of enamel apatite. The principal difference in atomic parameters between enamel apatite and Holly Springs hydroxylapatite is in O2, which is…
Many of the MR examinations performed in the world each year are accompanied by administration of one of these frequently used intravenous contrast agents: Magnevist, Omniscan, and ProHance. Accordingly, MR practitioners must understand the basic pharmacokinetics, side effects, and the potential for adverse events for…
Growth in polypropylene usage as a cost effective replacement of engineering polymers polypropylene - structure, properties, applications chemical coupling agents for filled and GR-PP composites stabilization of flame retarded polypropylene effects of processing and microstructuring in recycled polypropylene and its b…
Three different water−alcohol cosolvent systems were used to assemble mesoporous molecular sieve silicas with wormhole framework structures (previously denoted HMS silicas) from an electrically neutral amine surfactant (S°) and a silicon alkoxide precursor (I°). The fundamental particle size and associated textural (i…
We present a model which accounts for the dramatic evolution in the microstructure of electroplated copper thin films near room temperature. Microstructure evolution occurs during a transient period of hours following deposition, and includes an increase in grain size, changes in preferred crystallographic texture, an…
Piezoelectric properties of barium titanate single crystals were investigated at room temperature as a function of crystallographic orientation. When a unipolar electric field was applied along [001], its strain vs electric-field curve showed a large hysteresis, and finally barium titanate crystal became to single-dom…
A disadvantage of organic nonlinear optical (NLO) materials is often their low physico-chemical stability. One approach to overcoming this is demonstrated by β-BNPT-DTO, synthesized by the authors and shown in the Figure, in which S…S intermolecular interactions confer stability. The main emphasis of this article, how…
A polyamidoamine (PAMAM®) dendrimer generation 3.5 with a sodium carboxylate surface was conjugated to cisplatin giving a dendrimer-platinate (dendrimer-Pt; 20–25 wt% platinum) which was highly water soluble and released platinum slowly in vitro. In vivo the dendrimer-Pt and cisplatin were equi-active i.p. against i.p…
The capability of sodium hydride as a reducing agent in oxide deintercalation reactions is explored. The Ni(III) perovskite LaNiO 3 can be reduced topotactically to LaNiO 2, isostructural with the “infinite layer” cuprates, using solid sodium hydride in a sealed evacuated tube at 190 ≤ T /°C ≤ 210, and a similar infin…
A polyamidoamine (PAMAM) dendrimer generation 3.5 with a sodium carboxylate surface was conjugated to cisplatin giving a dendrimer-platinate (dendrimer-Pt; 20-25 wt% platinum) which was highly water soluble and released platinum slowly in vitro. In vivo the dendrimer-Pt and cisplatin were equi-active i.p. against i.p.…
Using extensive molecular dynamics simulations of an equilibrium, glass-forming Lennard-Jones mixture, we characterize in detail the local atomic motions. We show that spatial correlations exist among particles undergoing extremely large ("mobile") or extremely small ("immobile") displacements over a suitably chosen t…
Fundamental notions concerning absolute structure and absolute configuration, and their determination from single-crystal diffraction measurements, are presented and reviewed. A glossary of terms with definitions useful in this field is provided. For absolute structure and its determination, the separate but interacti…
The structural, dielectric and piezoelectric properties of [Bi 0.5 (Na 1- X K X ) 0.5 ]TiO 3 ceramics were studied for the compositional range, X =0–1.0. The samples were prepared by a conventional sintering technique. From X-ray diffraction results, it was found that the morphotropic phase boundary (MPB) between (Bi…
We have studied the work function and density of states (DOS) of multiwall carbon nanotubes (MWNTs) using ultraviolet photoelectron spectroscopy (UPS). Raw MWNTs were purified by successive sonication, centrifugation, sedimentation, and filtration processes with the aid of a nonionic surfactant. The purified MWNTs sho…
The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium…
Measurements were made of the Kerr constants of several mineral and silicone oils. The results indicate that these oils can be used to improve the sensitivity of measurements of the quadratic electro-optical effect in crystals. The possibility of using the electro-optical Kerr response of oils to determine experimenta…
Aqueous D 2 O solutions of lithium (0.5, 1, and 3 M) and sodium (1 and 3 M) perchlorate have been studied by FT-IR spectroscopy in their glassy states at 80 K, and their IR spectra compared with those of 1.0 M D 2 O solutions recorded from 300 to 235 K. Evidence for strongly increasing contact-ion pairing in going fro…
The three-dimensional silver-selenoarsenate RbAg2As3Se6 is a kinetic product in the methanolothermal reaction between RbCl, AgBF4 and Li3AsSe3. It contains [As3Se6]3- rings, connected by formal “Ag22+“ dumb-bell units to form a three-dimensional framework structure [Ag2As3Se6]-. The ability of the Ag22+ units to adapt…
The published data are surveyed and a comparative crystal-chemical analysis is presented for the structures of compounds containing mercury in low oxidation states as cluster Hgn groups with covalent Hg–Hg bonds. The geometry of compounds with Hg–Hg and Hg–X bonds (X = O, S, Se, N or Hal) is analysed and the types of…