Materials Literature
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The triple-helix structure of grafted collagen is reinforced with bimetallic Al2O3–ZrO2 nanoparticles (see figure), thereby significantly improving the mechanical and thermal stability of the polymer matrix. The stability of this hybrid nanocomposite is thought to derive from the chemical bonding between the surface o…
To improve the physico‐mechanical and chemical resistance properties, lower the curing temperature of annona squamosa and pongamia glabra seeds oils based polyesteramides [ASPEA, PGPEA], as well as to convert the non‐edible seed oils into value added products, their respective alumina‐incorporated polyesteramides resi…
We investigate the effects of erbium doping on SnO(2) nanoclustering in Sn-doped silica. Vibrational spectroscopy data from Raman and infrared absorption measurements show nanostructuring effects on the SnO(2) nanophase. Ultraviolet absorption spectra evidence a gap shift ascribable to size-dependent quantum confineme…
We report absorption spectra for Ag(7), Ag(9), and Ag(11) in an argon matrix grown at a temperature of 28 K and compare them with previous spectra of the same species measured in matrices of argon grown at lower temperatures as well as in neon matrices. We discuss the discrepancies in the light of the matrix crystalli…
The anionic conjugated polymer poly{1,4-phenylene[9,9-bis(4-phenoxybutylsulfonate)]fluorene-2,7-diyl} (PFP-SO 3 - ) can form a complex with cationic quencher 4-(trimethylammonium)-2,2,6,6-tetramethylpiperidine-1-oxyl iodide (CAT1) through electrostatic interactions. The fluorescence of PFP-SO 3 - is efficiently quench…
The binary nitride ${\mathrm{Cu}}_{3}\mathrm{N}$ is a semiconductor with a rather open, cubic crystal structure built up from rigid, perpendicular Cu-N-Cu covalent bonds. It has been reported experimentally that the voids in this structure can be filled with Pd atoms and that one ends up with $\mathrm{Pd}{\mathrm{Cu}}…
Based on gradient-corrected density-functional theory and genetic global optimization approach that directly searches for the configuration of greatest stability, we are able to find particularly stable structures for binary gallium arsenide clusters. We report a formation of fullerenelike ${\mathrm{Ga}}_{n}{\mathrm{A…
Abstract In this work dynamic and steady‐state CH 4 partial oxidation tests, performed in an insulated lab‐scale reactor over a Rh‐based catalyst supported onto Al 2 O 3 spheres, are presented and discussed. To gain insight in the complex observed phenomena a previously developed 1D heterogeneous mathematical model of…
We investigated the nanoscale tribological properties of a decagonal quasicrystal using a combination of atomic force microscopy and scanning tunneling microscopy in ultrahigh vacuum. This combination permitted a variety of in situ measurements, including atomic-scale structure, friction and adhesion force, tip-sample…
The synthesis of a series of soluble poly(2,7-phenanthrylene)s and poly(3,6-phenanthrylene)s is presented. Depending on the nature of the repeat units they constitute analogues of poly( p -phenylene) (PPP) and poly( p -phenylenevinylene) (PPV) and thus should give rise to different modes of extended π -conjugation. In…
We studied the electrochemical and spectroscopic properties of a series of extended silole-based chromophores to understand the effect of structure on behavior. By changing the substituents attached to the chromophore, we observed large variations in luminescence quantum efficiency (ca. 0-0.6), lambdamax for absorbanc…
Abstract The chemical structure of a water‐soluble polysaccharide, coded as TM3b, extracted from sclerotia of Pleurotus tuber‐rigium was analyzed to be a hyperbranched β‐ D ‐glucan with β‐(1→6), β‐(1→4), and β‐(1→3)–linked residues, with degree of branching (DB) of 57.6%. The results from size‐exclusion chromatography…
Paramagnetic lanthanide(III) complexes that contain hyperfine-shifted exchangeable protons offer considerable advantages over diamagnetic molecules as chemical exchange saturation transfer (CEST) agents for MRI. As part of a program to investigate avenues to improve the sensitivity of such agents, the CEST characteris…
An apparently first-order polyamorphic transition has been observed with increasing pressure at ambient temperature in a molecular glass of composition Ge(2.5)As(51.25)S(46.25) Raman spectroscopic measurements on pressure-quenched samples and in situ x-ray diffraction measurements indicate that this transition corresp…
The difference in the morphology and crystallization aspects of hydrogen-bond-mediated self-assembling systems with single and double hydrogen-bonding motifs is studied here with carbamates as an example. These carbamates have alkyl side chains of various lengths, from C(4) to C(18). The biscarbamates with double hydr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSensory Polymers for Electron-Rich Analytes of Biological InterestYoungmi Kim and Timothy M. SwagerView Author Information Department of Chemistry and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Ca…
The carbon contents in carburized steels were investigated by electron probe microanalysis (EPMA) for a range of carbon levels in the solid solution less than 1 wt%. This article describes the difficulties encountered with the classic analytical procedure using the k ratio of X-ray intensities and the phi(rhoz) model.…
Numerical self-consistent-field theory calculations by Tyler and Morse [Phys. Rev. Lett. 94, 208302 (2005)] predict a stable orthorhombic network phase with space group in very weakly segregated diblock copolymer melts. Here, we examine the predicted stability of this phase within a simple Landau theory of weakly orde…
Abstract Summary: The oligomeric A 2 plus monomeric B 3 synthetic methodology provided highly branched, poly(ether urethane)s based on TMP (B 3 ) and isocyanate endcapped polyethers. 13 C NMR spectroscopic assignments for the branched polyurethanes were verified using model urethane‐containing compounds based on TMP a…
Abstract Summary: The unique crystallization behavior of a poly[(butylene succinate)‐ co ‐adipate] (PBSA) nanocomposite is addressed. Nanocomposites have been prepared by melt blending PBSA and organically modified synthetic fluorine mica (OSFM) in a batch mixer. The structure of the nanocomposite is studied by using…