Materials Literature
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Concepts of the synthesis of shell topological compounds, which consist of a guest molecule (or molecules) trapped by a host molecule with a spacial, egg shell-like structure are discussed. Generally, both constructing the shell molecule in the presence of a guest molecule and constructing the guest molecule in the pr…
The adhesion and locomotion of mouse peripheral lymph node lymphocytes on 2-D protein- coated substrata and in 3-D matrices were compared. Lymphocytes did not adhere to, or migrate on, 2-D substrata suck as serum- or fibronectin-coated glass. They did attach to and migrate in hydrated 3-D collagen lattices. When the c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloid porphyrins and phthalocyaninesPhillip Sayer, Martin Gouterman, and Charles R. ConnellCite this: Acc. Chem. Res. 1982, 15, 3, 73–79Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 March 1982https://pubs.acs.org/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallinity in perfluorosulfonic acid ionomers and related polymersHoward W. Starkweather Jr.Cite this: Macromolecules 1982, 15, 2, 320–323Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 March 1982https://pubs.acs.org…
Abstract Based on a few characteristics of the pure rubber and plastic components, rubber-plastic combinations can be selected, with a high probability of success, to give thermoplastic vulcanizates (by dynamic vulcanization) of good mechanical integrity and elastic recovery. The characteristics used in the selection…
Summary Translocated (oxalate‐soluble) Al and Fe are present predominantly in inorganic forms in the B 2 horizons of the five pcdzol profiles examined: A1 as imogolite and proto‐imogolite allophanes, and Fe as a separate oxide phase. Below the top few cm of the B 2 horizon, over 75 per cent of the extractable (acid‐pl…
The structure of 52/48 mol % copolymer of vinylidene fluoride and trifluoroethylene has been investigated at various temperatures by X-ray diffraction. Melt-solidified samples consist of a mixture of two disordered crystalline phases, one trans-planar, the other 3/1-helical. Samples may be transformed to either phase…
The principal sources of fracture in ceramic polycrystals have been identified; they include surface cracks produced during surface finishing and voids, inclusions, or large grains generated during processing. The dominance of a specific fracture source depends on the microstructure, test temperature, and stress distr…
This paper presents the structural, electrical, and optical properties of F- and (Sb+F)-doped tin oxide films prepared by spray pyrolysis technique. Resistivity as low as 5.5×10−4 Ω cm with high optical transmission (≳80%) and high infrared reflection (∼90%) have been obtained in F-doped tin oxide films. The figure of…
Abstract A description is given of an analytical temperature‐rising elution fractionation (TREF) system for the purpose of determining short‐chain branching (SCB) or copolymer distributions in poly‐ethylenes and ethylene copolymers. The system achieves fractionation on the basis of crystallizability and is shown to be…
The effect of added Al, as an acceptor impurity, on the equilibrium electrical conductivity of large‐grained, polycrystalline BaTiO 3 , is consistent with a previously proposed defect model which involves only doubly ionized oxygen vacancies, electrons, holes, and acceptor impurities. The behavior is an extension of t…
The space group and atom configuration of monoclinic Na2Ti9O19 have been studied by combining 1 MeV high-resolution electron microscope imaging with the convergent-beam electron diffraction (CBED) technique. The crystal has monoclinic symmetry with lattice parameters a = 12.2, b= 3.78, c = 15.6 Å and β= 105°. The spac…
Analyzed is a systematic fault, in the carrying out of tests, which permits the establishment of the possible causes which originate the alteration of stones in artistic monuments. As a result, a collection of methods is proposed, adopted by the ASTM standards and recommended by the RILEM, which permit the functioning…
The petrographic parameters and the physical properties controlling the alteration of the monumental stones of the Cathedral of Oviedo (Spain) are analized in this first paper. A special emphasis is placed on the characterization of the porosity, on account of the role this plays in the development of the forms and ph…
This paper deals with the behaviour during about one year, of cast-iron and galvanized cast-iron tubes used for water pipes in building instalations, either as such or previously wrapped up in newspaper —according to some local practices—, from the viewpoint of their corrosion in contact with cement mortars and concre…
With reference to some comments recently made by the well known and informed author A. VIRELLA BLODA in a wide and detailed report on the Congress referred to, published in the Technical Review CEMENTO-HORMIGON, concerning the Round Table of Theme IV: POZZOLANAS AND FLY-ASHES and particularly to a paper presented unde…
In this work, the first of another new series, a study is made on the influence brought by adding different quantities of a groundgranulate slag to a high initial resistance industrial portland cement (cement 1 < > P-550-ARI) in its chemical-strength behaviour against the action of a gypsum saturated solution, determi…
Evans (1971) has reported that voids produced by irradiation could form into three-dimensional arrays. Since then void lattices have been observed in a number of metals, for example, Mo, W, Nb, Ta, Al and Ni. In all these metals the pattern of ordering shows many similarities. A number of theories have been proposed t…