Materials Literature
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Multilamellar liposomes consisting of dipalmitoyl phosphatidylcholine (DPPC) and dicetyl phosphate (DCP) in a molar ratio of 8:2 (DPPC:DCP = 8:2) were coated with three different types of polymers: chitosan, polyvinyl alcohol having a long alkyl chain, and poly(acrylic acid) bearing cholesterols. The existence of poly…
Sommaire : 1.Fibrous reinforcements for composite materials. 2.Matrices. 3.Fabrication of polymer composites. 4.Mechanical properties of composites - micromechanics. 5.Mechanical properties - macromechanics. 6.Environmental aspects
This paper discusses the results of a basic study for the development of 500 kV XLPE power cables. The authors have established that the factors that decide the performance of today's XLPE cables are impurities in the insulator and protrusions on the semiconductive layer, and that the insulation performance of XLPE po…
Sn3S7·(NMe4)2·H2O has been shown to consist of the framework of composition [Sn3S7]2– with the two exchangeable [NMe4]+ ions occupying cavities in the structure; these molecules can be exchanged with a variety of alkali, alkali earth and transition metal cations.
In order to obtain the diffusion coefficient of hydrogen in iron free from trapping by dislocations and impurities, electrochemical permeation measurements have been done using high purity iron (99.99 mass% Fe), pure iron (99.99 mass% Fe, high substitutional and low interstitial impurity contents), pure iron (99.94 ma…
The sol-gel process opens the possibility of combining inorganic and organic units on a molecular or nanosized level. The flexible chemical approach of tailoring inorganic structures as well as organic polymeric structures in combination with the new concept of incorporation of nanoscaled metal oxide particles opens t…
The mechanical alloying (MA) process was developed in the mid-1960s and has evolved to commercial status with the production of oxide dispersion strengthened INCONEL® and INCOLOY® 1 MA alloys. These Ni- and Fe-based alloys possess exceptional high temperature strength, high temperature stability, and hot corrosion res…
The number and strength of the acid centres of tungstic heteropolyacids have been determined by absorption calorimetry of ammonia. The initial heats are in the order H3PW12O40>H4SiW12O40>H6P2W21O71(H2O)3>H6P2W18O62, varying from 200 to 155kJ mol–1. An increase in the number of protons in Keggin heteropolyanions decrea…
In-reactor and long-term autoclave corrosion data have been obtained on ZIRLO and three variants of Zircaloy-4: conventional (1.5% tin), low-tin, and beta-treated. In-reactor data from demonstration assemblies irradiated in the Virginia Power Company's North Anna Unit 1 reactor demonstrate the superiority of ZIRLO and…
Open lamellar systems such as layered double hydroxides (LDHs) can be used to generate new intercalation compounds. We report the synthesis of nanocomposite materials consisting of organopolymer molecules encapsulated between ultra-thin mixed-metal hydroxide sheets which are propped apart by spacers [terephthalate or…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of hard-segment flexibility on phase separation of segmented polyurethanesYingjie Li, Wanxuan Kang, James O. Stoffer, and Benjamin ChuCite this: Macromolecules 1994, 27, 2, 612–614Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Pu…
We have measured simultaneously both the normal forces F⊥(D) and the shear forces F∥(D) that act between compressed polymer-bearing mica surfaces, a distance D apart, as they slide past each other. We find that for surface-attached polystyrene (PS) brushes in the good solvent toluene the shear forces are extremely wea…
We have determined the segregation of diblock copolymers of deuterated polystyrene (dPS) and poly(2-vinylpyridine) (PVP) to a planar interface between the homopolymers using forward recoil spectrometry. The segregation isotherms, namely the interfacial excess versus its volume fraction in the homopolymer phase far fro…
Raman spectra have been obtained from a series of Pt/Al2O3 catalysts containing from 0 to 20% CeO2, and a Pt/CeO2 catalyst, prepared by sol–gel processing. Spectra were recorded following calcination of the catalyst precursors at various temperatures up to 600 °C and compared with thermogravimetric data. The results c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrafted polymer brushes: a constant surface pressure molecular dynamics simulationGary S. GrestCite this: Macromolecules 1994, 27, 2, 418–426Publication Date (Print):January 1, 1994Publication History Published online1 May 2002Published inissue 1 January 1994https://pubs.acs…
The chemical sol-gel route is used to prepare undoped and substituted barium and strontium ferrites. Beside standard crystallographic and magnetic measurements, ferromagnetic resonance experiments are used to analyze the formation of the hexaferrite phase and to determine the anisotropy field strength. Specific satura…
Although vibronic Jahn-Teller interactions almost always cause both 4- and 6-coordinate copper(II) complexes to distort significantly away from regular tetrahedral and octahedral geometries, rather different factors influence the size and nature of the distortions. In the former case, the active mode is a bending vibr…
The synthesis of layered lithium aluminium hydrotalcite-like materials is described along with different anion exchange procedures for the preparation of materials intercalated with chloride, nitrate and vanadate. The products have been characterised using elemental chemical analysis, powder X-ray diffraction, Fourier…
Three spiro[indoline-naphthoxazines] and a spiro[indoline-phenanthroxazine], which exhibit photochromic and thermochromic properties, have been investigated. Solvent and structure effects on the absorption spectra of the merocyanines produced under UV irradiation and kinetic parameters for the ring-closure and ring-op…
Metallic materials are used extensively as orthopedic implants, dental materials, sensing elements of bioelectrodes, and other applications. The electrochemical behavior of these biomaterials is of interest for a variety of reasons. The corrosion resistance of an implant material influences its functional performance…