Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We revisit the problem of semiflexible chain condensation by neutral depleting agents (e.g., colloidal spheres or flexible polymers) by using a simple formalism that allows us to address its main features without specifying the kind of depleting agents. Correlations between depleting agents are shown to produce a resw…
The structures, magnetism, and electronic transport properties of (La 1+ x Sr 1 - x )CoRuO 6 (−0.50 ≤ x ≤ 0.25) double perovskites have been investigated. All samples are found to crystallize with the monoclinic P 2 1 / n superstructure. An increase of antisite disorder with | x | is found to be controlled by a reduct…
We have designed a new type of fluorescent nanosensors through the preparation of organic luminescent nanocrystals grown in sol−gel films prepared by spin-coating. These nanosensors exhibit low cost preparation and easy nanocrystal functionalizations with the possibility to involve typical molecular probes while the s…
Abstract The formation and characterization of some interpolyelectrolyte complex (IPEC) nanoparticles based on poly(sodium 2‐acrylamido‐2‐methylpropanesulfonate) (NaPAMPS), as a function of the polycation structure, polyanion molar mass, and polyion concentration, were followed in this work. Poly(diallyldimethylammoni…
Abstract The crosslinking reaction of low‐density polyethylene with vinyl triethoxysilane was studied in great detail. The effects of a wide range of concentrations (0–27.33 phr silane and 0–1.25 phr benzoyl peroxide) on the mechanical properties, hot‐set testing, gel contents, and burning behaviors of the resulting c…
A new technique to produce very small magnetic nanoparticles of maghemite (γ-Fe 2 O 3 ) is presented. The particles form and precipitate in the presence of the oligosaccharide γ-cyclodextrin and in the final product remain entrapped in tiny pseudo-single crystals of the organic host. Evidence of nanosized particles em…
Enhancing strength and toughness synergistically via graphene-induced twinning in nanocrystalline nickel,
We show that for Fe-based alloys the spontaneous volume magnetostriction can be calculated from first principles in good agreement with experiment. Our results are obtained by modeling the paramagnetic state above the magnetic ordering temperature as a state with disordered local moments. Investigating bcc Fe-Co and f…
Je kleiner, je besser: Die Abscheidung von Gold auf nanokristallinen Cerdioxid-Partikeln – statt auf einem regulären Cerdioxid-Träger – erhöht die Aktivität des resultierenden Katalysators in der selektiven Oxidation von CO zu CO2 selbst in Gegenwart von H2 (siehe Bild) um zwei Größenordnungen.
The crystal structure of bis(cyclopentylammonium)tetrabromocuprate(II) has been determined at room temperature and at -70 degrees C. The room temperature structure is orthorhombic, space group Pn2(1)a, with a = 12.092(6) A, b = 8.134(4) A, and c = 18.698(10) A. The low temperature structure is also orthorhombic, space…
Baeyer-Villiger oxidation of racemic bicyclic cyclobutanones with Zr[bis(salicylidene)ethylenediaminato] (salen) complex 1 as catalyst in the presence of a urea-hydrogen peroxide adduct was found to proceed enantiospecifically. The enantiotopos selection in the oxidation was governed primarily by the Zr(salen) catalys…
A pseudomorphous and topotactic solid-state transformation of Ta2O5 by reaction with NH3 at 850 °C is used to produce TaON as well as Ta3N5 powders consisting of porous single-crystalline particles. The pore diameter is 10−20 nm.
We recently discovered that wheat gluten could be formed into a tough, plasticlike substance when thiol-terminated, star-branched molecules are incorporated directly into the protein structure. This discovery offers the exciting possibility of developing biodegradable high-performance engineering plastics and composit…
Abstract Composites made of feather fiber (Ff), kraft pulp fiber (Pf), polypropylene (PP), and maleic anhydride modified polypropylene (MaPP) were tested in tension and three‐point bend tests. Composite panels were compression molded from multiple plies of nonwoven, fabric‐like prepreg manufactured with wetlay paperma…
UNLABELLED: To facilitate the building of triple-helical polypeptide structures, we provide an interactive, platform-independent Tcl/Tk script. User specified amino acid sequences are parsed to obtain localized melting temperature estimates corresponding to helical propensity. These propensities may be graphically exa…
With a unique combination of strength and toughness among materials, spider silk is the model for engineering materials. This paper presents the stress-strain behavior of Nephila clavipes spider silk under tension, transverse compression, and torsional deformation obtained by a battery of micro testing equipment. The…
The reaction of [Mn(3)O(O(2)CMe)(6)(py)(3)](ClO(4)) (1; 3Mn(III)) with [Mn(10)O(4)(OH)(2)(O(2)CMe)(8)(hmp)(8)](ClO(4))(4) (2; 10Mn(III)) in MeCN affords the new mixed-valent complex [Mn(21)O(14)(OH)(2)(O(2)CMe)(16)(hmp)(8)(pic)(2)(py)(H(2)O)](ClO(4))(4) (3; 3Mn(II)-18Mn(III); hmp(-) is the anion of 2-(hydroxymethyl)py…
Mode-coupling theory (MCT) predicts the arrest of colloids in terms of their volume fraction, and the range and depth of the interparticle attraction. We discuss how the effective values of these parameters evolve under cluster aggregation. We argue that weak gelation in colloids can be idealized as a two-stage ergodi…
Abstract Green composites composed of regenerated cellulose (lyocell) fabric and biodegradable polyesters [poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvarelate) (PHBV), poly(butylene succinate) (PBS), and poly(lactic acid) (PLA)] were prepared by compression‐molding method. The tensile moduli and strength of all the biodegra…
Abstract The properties of two polyethylenes [a high‐density polyethylene (HDPE) and a low‐density polyethylene (LDPE)] were studied after several extrusion cycles. To reduce the degradation effects during the reprocessing, a mixture of two stabilizers was added to the formulations. The predominant degradation mechani…