Materials Literature
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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…
In the present contribution, we demonstrated that surface-enhanced resonance Raman scattering spectra from single green fluorescent proteins (GFPs) were obtained. The most important findings are the direct detection of the conversion between a deprotonated and a protonated form of the chromophore at the single-molecul…
In this paper various predictions for the scaling exponents of the Nonlocal Kardar-Parisi-Zhang (NKPZ) equation are discussed. I use the Self-Consistent Expansion (SCE), and obtain results that are quite different from result obtained in the past, using Dynamic Renormalization Group analysis (DRG), a Scaling Approach…
The polycondensation of isophorone diisocyanate (IPDI) with dodecanediol has been performed in aqueous miniemulsion in order to obtain hydrophobic polyurethane dispersions. The influence of several factors, such as temperature, surfactant, and catalyst, on the molecular weight has been studied in detail. It has been f…
We report a first-principles study of a class of $({\mathrm{BiScO}}_{3}{)}_{1\ensuremath{-}x}\ensuremath{-}({\mathrm{PbTiO}}_{3}{)}_{x}$ (BS-PT) alloys recently proposed by Eitel et al. as promising materials for piezoelectric actuator applications. We show that (i) BS-PT displays very large structural distortions and…
We address the microscopic origin of the current-induced forces by analyzing results of first principles density functional calculations of atomic gold wires connected to two gold electrodes with different electrochemical potentials. We find that current induced forces are closely related to the chemical bonding, and…
The effect of edge and corner diffusions on the morphology and on the density of islands nucleated irreversibly on a flat substrate surface is studied. Without edge and corner diffusion, islands are fractal. As an edge diffusion constant $D_e$ increases, islands tend to take a cross shape with four needles in the $< 1…
Recent works aiming at understanding magnetotransport phenomena in ferromagnetic III-V and II-VI semiconductors are described. Theory of the anomalous Hall effect in p-type magnetic semiconductors is discussed, and the relative role of side-jump and skew-scattering mechanisms assessed for (Ga,Mn)As and (Zn,Mn)Te. It i…