Materials Literature
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Brought to light: The light sensitivity of photolabile protecting groups of the nitrophenylpropoxycarbonyl (NPPOC) type was enhanced by up to a factor of 25. This was achieved by covalently linking the protecting group to a sensitizer with a much better absorptivity and the ability to transfer its electronic excitatio…
Silica-coated silver nanowires can be chemically treated to produce a "peapod" architecture in which silver peas are embedded in silica pods. The silver "pea" dimension and interparticle spacings are controllable down to approximately 50 nm. This architecture is potentially useful for chemical sensing, plasmonic, or c…
Quasielastic neutron scattering combined with deuteration labeling has allowed us to follow selectively the dynamics of the hydrogens of poly(ethylene oxide) (PEO, T g ≈ 220 K) in a blend with poly(vinyl acetate) (PVAc, T g = 315 K) (20% PEO/80% PVAc in weight, = 280 K). Temperatures between −10 K and + 120 K have bee…
The tetrabutylammonium salt of 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS) is soluble in dichloromethane, and the general properties of this compound have been investigated as function of various added acids HX (X = Cl, Br, I, CF(3)COO, CF(3)SO(3), TFPB) through UV-vis absorption spectroscopy, steady state…
We have investigated the high-pressure and high-temperature behavior of $\mathrm{Ge}{\mathrm{O}}_{2}$ with the help of extensive molecular dynamics simulations. Our calculations show that $\ensuremath{\alpha}\text{\ensuremath{-}}\mathrm{Ge}{\mathrm{O}}_{2}$ transforms reversibly to a denser and higher-coordinated (Ge-…
The addition of carbenes CX(2) (X=H, Cl) to single-walled carbon nanotubes (SWNTs) was investigated by density functional theory and finite, hydrogen-terminated nanotube clusters or periodic boundary conditions in conjunction with basis sets of up to polarized triple-zeta quality. For armchair [(3,3) to (12,12)] and z…
Abstract Nanocrystals and their ordered arrays hold many important applications in fields such as catalysis, surface‐enhanced Raman spectroscopy based sensors, memory storage, and electronic and optical nanodevices. Herein, a simple and general method to synthesize ordered, three‐dimensional, transparent gold nanocrys…
Tensile and impact properties of compression molded unsaturated polyester/jute composites were investigated as a function of fiber content and orientation. Both unidirectional fiber composites with 0-50% weight fiber content and a randomly distributed short-fiber composite with 30% w/w were manufactured. The unidirect…
Spontaneous assembly of long chains of nanoparticles (NPs) has been experimentally observed for many different materials including nanocolloids of semiconductors, metal oxides, and metals. While the origin of dipole moment in various colloids can be different, a universal explanation of chain assembly can be provided…
The compounding of recycled polypropylene (RPP) and wood saw dust (WSD) are carried out using five different filler loadings (0, 10, 20, 30, 40, and 50%) with three WSD filler sizes (100, 212, and 300 mm). The composites are mixed and extruded using Haake Rheodrive 500 twin screw extruder. The mechanical and water abs…
Most metallopolymers based on kinetically labile transitionmetal complexes are polyelectrolytes and dissolve in polar, coordinating solvents only. In these solutions, solvent molecules can displace the metallopolymers' original ligands and thus cause decomposition. Consequently, such systems are very difficult to char…
Polysorbate 80 (Tween 80) has been widely used as an emulsifier with excellent effects in nanoparticles technology for biomedical applications. This work was thus triggered to synthesize poly(lactide)/Tween 80 copolymers with various copolymer blend ratio, which were synthesized by ring-opening polymerization and char…
The adsorption of Pt(n)() (n = 1-3) clusters on the defect-free anatase TiO(2)(101) surface has been studied using total energy pseudopotential calculations based on density functional theory. The defect-free anatase TiO(2)(101) surface has a stepped structure with a step width of two O-Ti bond distances in the (100)…
The self-organization of carbon atoms close to a nickel surface, which is a process involved in the catalytic growth of carbon nanotubes, is analyzed using grand canonical Monte Carlo simulations based on a specifically designed tight-binding interaction model. This model accounts for the competition between very diff…
Drei ist noch überschaubar: Ein modularer Ansatz führte zu der elektroaktiven molekularen Verbindung 1, die aus klar abgegrenzten Elektronentransport-, Lochtransport- und Emissionseinheiten aufgebaut ist (siehe Strukturformel). Das trifunktionelle Molekül könnte sich zur Dotierung in organischen Leuchtdioden eignen, z…
Three's not a crowd: A modular approach was used to prepare 1, an electroactive molecular material that integrates distinct electron-transporting, hole-transporting, and emissive units (see picture). The trifunctional molecule holds promise for use as a dopant in organic light-emitting diodes. Moreover, the units can…
Nylon-11 was crystallized into different crystalline phases by appropriate methods. The change in the structure during heating was monitored in situ by wide-angle X-ray scattering (WAXS). The α phase obtained by precipitating nylon-11 in 1,4-butanediol started transforming into the pseudohexagonal phase on heating, bu…
Abstract Starch‐polyvinyl alcohol (PVA) blends in 2:8 wt % were prepared with various plasticizers such as polyethylene glycol (PEG‐200, PEG‐400) and glycerol. The crosslinking of starch‐PVA blends by epichlorohydrin was carried out in the presence of a plasticizer in situ. The obtained films were analyzed by Fourier…
The near-infrared (NIR) luminescent lanthanide ions, such as Er(III), Nd(III), and Yb(III), have been paid much attention for the potential use in the optical communications or laser systems. For the first time, the NIR-luminescent Ln(dbm)(3)phen complexes have been covalently bonded to the ordered mesoporous material…
We address the role of the nature of material disorder in determining the roughness of cracks which grow by damage nucleation and coalescence ahead of the crack tip. We highlight the role of quenched and annealed disorders in relation to the length scales $d$ and $ξ_c$ associated with the disorder and the damage nucle…