Materials Literature
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Abstract In Chapter 2, Dr Rietveld has provided an account of the inception and early development of his method and of the growth of its acceptance from being initially ignored to the very widespread and vigorous use in many fields that it now enjoys. In this chapter, we provide a general introductory account of what…
The lamellar phase of two binary systems, AOT/water and DDAB/water, is studied by X-ray or neutron scattering techniques, along dilution lines. We observe on both systems a large wave vector diffuse scattering with the following features : i) its shape is independent of dilution ; ii) its intensity scales linearly wit…
Abstract With the object to synthesize polyesters by enzymatic catalysis in organic media, two directions have been investigated: (1) the condensation polymerization of linear ω‐hydroxyesters and (2) the ring‐opening polymerization of lactones. The commercially‐available crude porcine pancreatic lipase (PPL), suspende…
Glasses along four compositional tie lines, I: xAl(PO 3 ) 3 ’(1 – x)NaPO 3 , II: xAlPO 4 ′(1 – x)NaPO 3 , III: xAl 2 O 3 ′(1 – x)NaPO 3 , and IV: xNaAlO 2 ,(1 – x)NaPO 3 , have been prepared and a number of their properties evaluated. In general, Al 2 O 3 additions increase the glass transition temperature, decrease t…
We present a theoretical analysis of the formation of a dendritic array in a directional-solidification experiment. Our calculation contains three sequential ingredients: acceleration of an initially flat interface and the concomitant buildup of a solutal boundary layer in front of it; onset of a morphological instabi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, spectroscopic and magnetic properties of rare earth metal(III) derivatives with the 2-formyl-4-methyl-6-(N-(2-pyridylethyl)formimidoyl)phenol ligandMarius Andruh, Evangelos Bakalbassis, Olivier Kahn, Jean Christian Trombe, and Pierre PorcherCite this: Inorg. Chem.…
We have used 27 Al and 31 P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy and X‐ray photoelectron spectroscopy (XPS) to describe quantitatively the relationships between the composition, structure, and properties of glasses in the Na 2 O.Al 2 O 3 .P 2 O 5 (NAP) system. In general, the glass pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilsesquioxane-siloxane copolymers from polyhedral silsesquioxanesJoseph D. Lichtenhan, Ngo Q. Vu, Jason A. Carter, Jeffrey W. Gilman, and Frank J. FeherCite this: Macromolecules 1993, 26, 8, 2141–2142Publication Date (Print):April 1, 1993Publication History Published online…
Abstract Empirical relationships between clay mineral transformations and temperature provide a basis for the use of clay minerals as geothermometers. Clay-mineral geothermometry has been applied mainly to diagenetic, hydrothermal, and contact- and burial-metamorphic settings to better understand the thermal histories…
Abstract The smectite-to-illite conversion during shale diagenesis has recently been used to constrain the estimate of a basin's thermal history. We have systematically investigated the kinetics for the conversion of a Na-saturated montmorillonite (SWy-1) to a mixed-layer smectite/illite as a function of KCl concentra…
Abstract Along with polyisoprenoids, polypeptides, polysaccharides, and polynucleotides, Nature contains a further group of biopolymers, the poly(hydroxyalkanoates). The commonest member of this group, poly[( R )‐3‐hydroxybutyrate] P(3‐HB), had been identified by Lemoigne as early as the 1920s, as a storage substance…
The physical basis of computationally tractable models of crystalline plasticity is reviewed. A statistical mechanical model of dislocation motion through forest dislocations is formulated. Following Franciosi and co-workers (1980-88) the strength of the short-range obstacles introduced by the forest dislocations is a…
Abstract Chlorite minerals, found in a great variety of rocks and geological environments, display a wide range of chemical compositions and a variety of polytypes, which reflect the physicochemical conditions under which they formed. Of particular importance for studies dealing with ore deposit genesis, metamorphism,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicelles based on AB block copolymers of poly(ethylene oxide) and poly(.beta.-benzyl L-aspartate)G. Kwon, M. Naito, M. Yokoyama, T. Okano, Y. Sakurai, and K. KataokaCite this: Langmuir 1993, 9, 4, 945–949Publication Date (Print):April 1, 1993Publication History Published onl…
A quantitative model which describes the aging of the material properties in acceptor doped ferroelectric ceramics as a result of the reorientation of defects in time is proposed. By this reorientation the domain walls are clamped by a time dependent force leading to the observed decrease of the material properties du…
We used electron-energy-loss spectrometry to measure the intensities of the white lines found at the onsets of the ${\mathit{L}}_{2}$ and ${\mathit{L}}_{3}$ absorption edges for most of the 3d and 4d transition metals. The intensities of the white lines, normalized to the trailing background, decreased nearly linearly…
A number of the d10 and s2 metal clusters are brightly luminescent, some with strongly medium dependent and temperature dependent spectral profiles. Such emissions are often from excited states assigned as having a mixed d-s/XMCT character, the key feature being enhanced electronic population in metal-metal bonding or…
The photochemical and thermal cis to trans isomerization of aromatic azo groups covalently bonded within polymers and its practical consequences as well as some other recent applications are reviewed. The kinetics and mechanism of the isomerization of azo polymers are briefly presented and then several recent developm…
Silver behenate, a possible low-angle diffraction standard, was characterized using the powder diffraction technique. Diffraction patterns obtained with 1.54 Å synchrotron and Cu Kα radiations showed thirteen regularly spaced (00l) peaks in the range 1.5–20.0°2θ. With the National Institute of Standards and Technology…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of uniform size colloidsEgon MatijevicCite this: Chem. Mater. 1993, 5, 4, 412–426Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi/10.1021/cm00028a004https://d…