Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteArchitectural Disparity Effects in the Morphology of Dendrimer−Linear Coil Diblock CopolymersDarrin J. Pochan, Lisa Pakstis, Elbert Huang, Craig Hawker, Robert Vestberg, and John PopleView Author Information Materials Science and Engineering and Delaware Biotechnology Institute, Un…
A new hydrocarbon/perfluorocarbon phase-switching strategy based on coordination of pyridyl-tagged molecules to a highly fluorinated dicopper-carboxylate complex possessing two accessible axial coordination sites is described. When a chloroform solution of the tetrapyridyl-substituted porphyrin 3 (0.1 mM, 2 mL) is lay…
Fracture resistance in biomineralized structures has been linked to the presence of proteins, some of which possess sequences that are associated with elastic behavior. One such protein superfamily, the Pro,Gly-rich sea urchin intracrystalline spicule matrix proteins, form protein-protein supramolecular assemblies tha…
By the first-principles calculations both for electronic structures and effective exchange constants, we investigate the stability of ferromagnetism of zinc-blende (ZB) type CrAs, and further examine a possibility of ferromagnetism of ZB type Mn M ( M =Si, Ge and Sn). ZB type CrAs, a half-metallic ferromagnet reported…
Rate constants of oxidation of thioanisole, PhSMe, by H 2 O 2 mediated by tetraperoxomolybdate dianion, Mo(O 2 ) 4 2-, are almost unaffected by addition of hexan-1-ol or octan-1-ol to micellized cetylpyridinium chloride, CPyCl, although these hydrophobic alcohols should perturb the micellar interfacial region. The equ…
We have introduced a nonswitching layer model to explain voltage shift phenomena of hysteresis loops in a heteroepitaxial barium titanate thin film capacitor. A nonswitching layer, which has irreversible spontaneous polarization, was assumed to be present between the ferroelectric layer and the bottom electrode layer.…
Abstract Seven possible regioselectively methylated cellulose acetates (RS‐MCAs)—2,3,6‐tri‐ O ‐methyl cellulose acetate, 3,6‐di‐ O ‐methyl cellulose acetate, 2,6‐di‐ O ‐methyl cellulose acetate, 2,3‐di‐ O ‐methyl cellulose acetate, 6‐ O ‐methyl cellulose acetate, 3‐ O ‐methyl cellulose acetate, and 2‐ O ‐methyl cellul…
New organometallic−organic hybrid materials are reported and their properties evaluated. The hybrid was formed by polymerizing methyl methacrylate with 0.3 mol% of a methacrylate-substituted oxotitanium cluster [Ti 6 O 4 (OEt) 8 (OMc) 8 ]. In this hybrid, the cluster core was functionalized by the organic ligands, and…
Monolithic silica columns with defined mesopore and a tunable macropore structure were fabricated by the gel-casting of ordered mesoporous silica precursors.
Abstract The polycondensation of decafluorobenzophenone with hexafluorobisphenol A was modified by the addition of a molecular sieve dehydrating apparatus to the refluxing reaction system. This modification promoted the polymerization and enabled the reactions to be conducted in milder conditions and completed in a sh…
Abstract A novel dianhydride monomer, 3,6‐di[3′,5′‐bis(trifluoromethyl)phenyl]pyromellitic dianhydride (12FPMDA), was synthesized via a three‐step process: (1) the preparation of 3,5‐bis(trifluoromethyl)benzene boronic acid (6FBB) and 3,6‐dibromo‐1,2,4,5‐tetramethylbenzene (2B4MB) via Grignard and bromination reaction…
The X-ray diffuse scattering intensities were measured at room temperature for the Pt rich Pt–15.0 at.% Cr single crystal quenched from 800°C three-dimensionally. The atomic short-range order (ASRO) intensity component from the total diffuse ones was separated with the use of Borie–Sparks method [Acta Cryst. A 27 (197…
Samarium films capped with a thin palladium overlayer undergo a metal to semiconductor transition during in-situ hydrogen loading ( P H2 =1.01 × 10 5 Pa) at room temperature. The transition is accompanied by a change in optical appearance, i.e. metallic gray samarium films change to golden greenish transparent samariu…
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1. Introduction Gels from natural polymers have received increasing attention over the past years. They display novel physicochemical properties, particularly in aqueous systems, lending themselves valuable for a plethora of advanced applications, particularly in foods, cosmetics, medicine and biotechnology. However,…
Various oligo- and poly(ethylene glycol)s were transformed into tin-containing macrocycles by “polycondensation” with dibutyltin dimethoxide. These cyclic oligo- and poly(ethylene glycol)s were heated with a spirocycle derived from phthaloyl chloride and 1,2-dimercaptoethane. This spirocycle inserts into the Sn−O bond…
The work function of the amorphous phase of hydrogenated carbon nitride ( a -CN x :H) was calculated using Fowler–Nordheim field emission. First, metal films were deposited on conductive ZnO:Al whiskers to determine the geometric field enhancement factor at the tip of the field emitter. The radius of curvature at the…
The binding of NO to the trinuclear cluster [Ru3O(CH3CO2)6(py)2]+ (py = pyridine) leads to a stable, diamagnetic [Ru3O(CH3CO2)6(py)2(NO)]+ complex, displaying extended electronic interactions which arise from the coupling of the unpaired π* electron of NO and the unpaired electron in the π-orbitals of the Ru3O unit. T…
The structure of the iodo-substituted tetrathiafulvalene derivative EDT-TTF-I is described, with neutral molecules associated into inversion-centred dyads; no short intermolecular I···I contacts are observed. Electrocrystallisation of EDT-TTF-I (1) or EDT-TTF-I2 (2) in the presence of [nBu4N][Ni(mnt)2] afforded 2:1 sa…
Efforts to synthesize extremely large rectangle-shaped porphyrin systems have yielded an unusual and unexpected collapsed structure that brings the porphyrin walls into van der Waals contact. The bent geometry of the nominally rigid ethynylpyridyl porphyrin ligand edges, mandated by the collapse of the rectangle, impa…