Materials Literature
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3,5-Bis(4-fluorobenzoyl)phenol was polycondensed under various reaction conditions. Low molecular weights were obtained ( M n < 8000 Da), and MALDI−TOF mass spectrometry indicated that the chain growth was limited by cyclization. In the best mass spectra the cyclic, hyperbranched poly(ether ketone)s were detectable up…
Ab initio calculations have been performed to study the electronic band structure and ferromagnetic properties of the organic radical $p\ensuremath{-}\mathrm{NPNN}.$ The density of states, the total energy, and the spin magnetic moment were calculated. The calculations revealed that the $\ensuremath{\delta}$ phase of…
The diffusion of different deuterium-labeled (OD) low-molecular-weight alcohols and D 2 O in Nylon 11 has been investigated by monitoring the NH/ND exchange in the polymer by Fourier transform near-infrared (FTNIR) spectroscopy. The results demonstrate that the diffusion process of the different penetrants is strongly…
The total vapor pressures of the erbium trihalides ErCl 3, ErBr 3, and ErI 3 were measured by the torsion method, and their temperature dependences can be expressed by the following equations over the given temperature ranges: ErCl 3 (s), log( p /kPa) = 12.04 ± 0.15 − (15159 ± 200)(K/ T ) from (880 to 1040) K; ErBr 3…
Ring-opening polymerization (ROP) of 2,2,4,4,6,6-hexamethyl-8,8-divinylcyclotetrasiloxane ( I ) initiated by both 1- tert -butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2λ 5,4λ 5 -catenadi(phosphazene) (C 22 H 63 N 13 P 4, P 4 - t -Bu superbase) and trifluoromethanesulfonic acid (CF…
20 nm diameter Fe–Co nanowire arrays with different composition were fabricated by electrodeposition. A nanoporous anodized aluminium oxide film was used as the substrate. The microstructure and magnetic properties were studied by x-ray fluorescence, transmission electron microscopy, x-ray diffraction and vibrating sa…
Structures and phase transition in the layered perovskite La0.6Sr0.1TiO3: a new orthorhombic structure solved from high-resolution diffraction in combination with group theoretical analysis, Christopher J Howard, Zhaoming Zhang
A chimie douce route based on successive redox and exchange reactions has allowed us to prepare new hybrid organic-inorganic materials, composed of polyacrylate macromolecules intercalated into layered double hydroxides (LDHs), deriving from Ni(OH)(2). Monomer intercalation and in situ polymerization mechanisms have a…
Combinatorial screening of materials formulations followed by the scale-up of combinatorial leads has been applied for the development of high-performance coating materials for automotive applications. We replaced labor-intensive coating formulation, testing, and measurement with a "combinatorial factory" that include…
The hydrolysis of terminal (t)butyl-ester groups provides the novel nonadentate podand tris[2-[N-methylcarbamoyl-(6-carboxypyridine-2)-ethyl]amine] (L13) which exists as a mixture of slowly interconverting conformers in solution. At pH = 8.0 in water, its deprotonated form [L13 - 3H](3-) reacts with Ln(ClO(4))(3) to g…
Uniform finite facets are frequently observed at grain boundaries (GBs) and are usually attributed to equilibrium stabilization by GB stress. We report calculations for an aluminum twin GB using density functional theory, the embedded-atom method, and continuum elasticity theory. These methods show that GB stress is m…
In this work, Mn-doped PbSe nanocrystals (NCs) have been, for the first time, prepared through a high-temperature organic solution approach. To ensure that all the Mn2+ ions are indeed incorporated into the NCs and not only physically presented at the surface, Mn-Se prebonded precursor was selected, and a ligand-excha…
A model system involving a synthetic polyamide fiber and a water-soluble polymer for the selective nucleation of polymorphs of calcium carbonate crystals under specific experimental conditions is described. The functional groups at the surface of both commercially available and chemically modified polyamide fibers ind…
A novel pathway to hierarchically porous silica monoliths with macropores in the range of 200−800 nm and periodically arranged mesopores with a repeating unit distance of 11 nm is presented by an ethylene glycol-modified silane as inorganic precursor in the presence of an amphiphilic block copolymer as a structure-dir…
We have designed and synthesized a water-soluble, sulfonated version of an azobenzene-based thiol-reactive cross-linker that can be introduced into peptides and proteins and act as a conformational photoswitch. The sulfonated compound is shown to effect a similar degree of conformational control on a model peptide hel…
A new straightforward method of synthesis of dendrimers, using two branched monomers (CA(2) and DB(2)), is described. Each generation is obtained in a single quantitative step, with only N(2) or H(2)O as byproducts; generation 4 is obtained in only four steps. The end groups are alternatively phosphines and hydrazines…
Using the two-dimensional (2D) refocused CP-INADEQUATE spectra of natural abundance Cladophora and tunicate celluloses, we determined the 13 C homonuclear through-bond correlations of cellulose I α and I β, respectively. Two sets of the 13 C− 13 C connectivities from C1 through C6 were observed in the 2D INADEQUATE sp…
We demonstrate a new procedure to synthesize covalently linked hyperbranched polyglycidol brushes on Si/SiO 2 surfaces via anionic ring-opening multibranching polymerization of glycidol at 110 °C. Optimization of the polymerization experiments by exploiting reinitiation cycles produced polyglycidol brushes with ellips…
We report on the effect of mutual polyelectrolyte charge and secondary interactions on the formation of polyelectrolyte multilayer films of a lowly charged copolymer of acrylamide and [3-(2-methylpropionamido)propyl]trimethylammonium chloride, AM-MAPTAC 10 (10 mol % of cationic monomers), and poly(acrylic acid) (PAA).…
Highly uniform, smooth, and conformal coatings of tungsten nitride were synthesized by atomic layer deposition (ALD) from vapors of a novel precursor, bis( tert- butylimido)-bis(dimethylamido)tungsten, ( t BuN) 2 (Me 2 N) 2 W, and ammonia at low substrate temperatures (250−350 °C). This tungsten precursor is a low-vis…