Materials Literature
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Abstract In this work, the white‐silica‐filled vulcanizates of brombutyl rubber (BIIR)/cis 1,4 polybutadiene rubbers (BR) with hydrogenated aromatic hydrocarbon (C5) petroleum resins were prepared by compression molding, and the effects of C5 petroleum resin content on the damping behaviors and mechanical properties o…
The ceramic precursor for HfB 2 / HfC / SiC / C was prepared via solution‐based processing of polyhafnoxanesal, linear phenolic resin, boric acid and poly[(methylsilylene)acetylene)]. The obtained precursor could be cured at 250°C and subsequently heat treated at relative lower temperature (1500°C) to form HfB 2 / HfC…
Behaviors of rat aortic smooth muscle (A7r5) and human osteosarcoma (U2OS) cells on photo-cross-linked polyelectrolyte multilayers (PEMUs) with uniform, or gradients of, moduli were investigated. The PEMUs were built layer-by-layer with the polycation poly(allylamine hydrochloride) (PAH) and a polyanion poly(acrylic a…
Electrochemical devices using as substrates copier grade transparency sheets are developed by using ion conducting Nafion:polypyrrole mixtures, deposited between gold bottom electrodes and upper electrodes based on Multi Walled Carbon Nanotubes (MWCNTs). The electrical properties of the Nafion:polypyrrole blends and o…
The unexpected role of nucleophilic assistance of solvents and intermediates generated in situ in catalyzing NH2BH2 oligomerization is revealed in a computational study. The rate-determining free-energy barrier E(A) that is due to solvent participation for conversion of NH2BH2 to cyclotriborazane (NH2BH2)3 is only 12.…
Bulk ceramic 72.5 mol%( Bi 0.5 Na 0.5 ) TiO 3 –22.5 mol%( Bi 0.5 K 0.5 ) TiO 3 –5 mol% Bi ( Mg 0.5 Ti 0.5 ) O 3 ( BNT – BKT – BM gT) has previously been reported to show a large high‐field piezoelectric coefficient ( d 33 * = 570 pm/V). In this work, the same composition was synthesized in thin film embodiments on pla…
Nanokristallklar: Optisch-magnetische (OM) difunktionelle NaGdF4:Nd3+,Yb3+,Er3-Nanokristalle, die lumineszierende Er3+-Ionen und koordinierende magnetische Gd3+-Ionen enthalten, wurden synthetisiert. Die Lumineszenz der Nanokristalle konnte über ein angelegtes Magnetfeld eingestellt werden (siehe Bild) – sowohl bei Ra…
The mechanical properties of single crystals are of interest as they represent the behavior of the basic building blocks. Using the density functional theory based ab initio technique we have devised an approach to analyze the behavior of single crystal so their mechanical properties can be studied beyond linear elast…
ABSTRACT The ring‐opening polymerization (ROP) of cyclic esters, such as ε‐caprolactone, 1,5‐dioxepan‐2‐one, and racemic lactide using the combination of 3‐phenyl‐1‐propanol as the initiator and triflimide (HNTf 2 ) as the catalyst at room temperature with the [monomer] 0 /[initiator] 0 ratio of 50/1 was investigated.…
Abstract The development of self‐healing materials, based on polymer blends, is an important issue either from a scientific or a technological point of view. The application of such materials can be remarkably extended if healing effects can be maintained even in polymers that are modified in order to tune their physi…
In this work, we explore the magnetocaloric and magnetic properties of isoelectronic manganites R0.6Sr0.4MnO3 (R = La, Pr, Nd, and Sm). Upon substitution of La3+ by smaller rare-earth ions, the average ionic radius 〈rA〉 of the A-site (A = (R, Sr)) elements systematically decreases. It is found that, with decreasing 〈r…
We have recently shown that thermolysine, a protease enzyme obtained from Bacillus thermoproteolyticus rokko , can be used to trigger the gelation of FEFK (F, phenylalanine; E, glutamic acid; K, lysine) tetrapeptides through reverse hydrolysis and formation of longer peptide sequences, mainly octapeptides, that self-a…
Eine Frage der Dotierung: Graphen-Nanobänder (GNRs) wurden auf einer Oberfläche in einer Bottom-up-Synthese hergestellt und selektiv an den Ecken durch Einführen von Stickstoffatomen in den Vorstufen dotiert. Während die Bandlückengröße von 2.8 eV durch die N-Substitution beinahe unverändert bleibt, wird eine lineare…
A new type of fluorescent polymeric micelles is developed by self-assembly from a series of amphiphilic block copolymers, poly(ethylene glycol)-b-poly[styrene-co-(2-(1,2,3,4,5-pentaphenyl-1H-silol-1-yloxy)ethyl methacrylate)] [PEG-b-P(S-co-PPSEMA)]. Their capability of loading doxorubicin (DOX) is investigated by moni…
Ferrous flatland: Two flattened FeIIO4 units that share an edge are found in the title compound (see structure). They are spanned by tripodal silanolate ligands, which form in situ from a trisilanol if iron ions are available for complexation. The compound approaches the situation in the natural iron silicate gillespi…
We developed a new Li 2 O – Al 2 O 3 – SiO 2 ( LAS ) ultra‐low expansion glass‐ceramic by nonisothermal sintering with concurrent crystallization. The optimum sintering conditions were 30°C/min with a maximum temperature of 1000°C. The best sintered material reached 98% of the theoretical density of the parent glass a…
A central issue in the study of polymer physics is to understand the relation between the geometrical properties of macromolecules and various dynamics, most of which are encoded in the Laplacian spectra of a related graph describing the macrostructural structure. In this paper, we introduce a family of treelike polym…
Mixing a bis-hydrophilic, cationic miktoarm star polymer with a linear polyanion leads to the formation of unilamellar polymersomes, which consist of an interpolyelectrolyte complex (IPEC) wall sandwiched between poly(ethylene oxide) brushes. The experimental finding of this rare IPEC morphology is rationalized theore…
Polyamidoamine (PAMAM) dendrimers have been widely explored as carriers of therapeutics and imaging agents. However, amine-terminated PAMAM dendrimers are rarely utilized in systemic applications due to their cytotoxicity and risk of opsonization, caused by their cationic charges. Such undesirable effects may be mitig…
A matter of phis: The size of macromolecules is determined by the "universal calibration" based on the Flory-Fox equation (see scheme). The effect of the segmental density of real branched systems on this equation is investigated. To study this effect, accurately prepared polymers with discrete molecular properties we…