Materials Literature
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The first facile syntheses of free-base di- and tetrabenzoporphycenes and their metal complexes are reported, based on retro-Diels-Alder reactions of the corresponding bicyclo[2.2.2]octadiene-fused porphycenes, prepared by McMurray coupling of alpha,alpha'-diformyldipyrrole. The photophysical and electrochemical prope…
Pressure-induced structural transformations of the ammonia borane complex (NH 3 ·BH 3 ) were investigated in diamond anvil cells by Raman spectroscopy and synchrotron IR spectroscopy up to 14 GPa at room temperature. Starting with a disordered tetragonal structure, NH 3 ·BH 3 is found to undergo several transformation…
The temperature dependence of the Stokes first-order optical phonon frequency has been measured for individual silicon nanowires with diameters between 33 to 180 nm in the temperature range of 20 to $300\text{ }\ifmmode^\circ\else\textdegree\fi{}\text{C}$. The nanowires were synthesized via both the vapor-liquid-solid…
Abstract In this work, poly(acrylonitrile‐butadiene‐styrene) (ABS) was subjected to five subsequent extrusion cycles and the effect of prolonged exposure to heat and shear stresses on its structural and performance properties was investigated. More specifically, the resulting chemical changes were studied by attenuate…
The magnetic characteristics of nanocrystalline ${\text{BiFeO}}_{3}$ with average crystallite sizes of $\ensuremath{\sim}50$ and $\ensuremath{\sim}100\text{ }\text{nm}$ are evaluated by studying the temperature and field dependence of magnetization at low temperatures. Different properties such as magnetization, coerc…
Electrons in isolated graphene layers are a two-dimensional gas of massless Dirac Fermions. In realistic devices, however, the electronic properties are modified by elastic deformations, interlayer coupling and substrate interaction. Here, we unravel the electronic structure of noninteracting, doped graphene layers by…
Abstract Novel aerogels (or aerocellulose) based on all‐cellulose composites were prepared by partially dissolving microcrystalline cellulose (MCC) in an 8 wt % LiCl/DMAc solution. During this process, large MCC crystals and fiber fragments were progressively split into thinner crystals and cellulose fibrils. The exte…
Abstract The aim of this work was to explore the feasibility of preparing thermoplastic films from commercial zein by film blowing technology. Zein, a cereal protein extracted from maize, was plasticized directly in the extruder, without the time‐consuming and expensive solubilization step, usually utilized in literat…
RBa(Co,M) 4 O 7 (R = Y, Ca, In and M = Zn, Fe, Al) oxides with a hexagonal structure and corner-shared (Co,M)O 4 tetrahedra have been synthesized and investigated as cathode materials for solid oxide fuel cells (SOFC). Among the various compositions investigated, YBaCo 4− x Zn x O 7 (1 ≤ x ≤ 2) shows long-term stabili…
A combined theory−experiment analysis of adsorbing polymer mediated structural reorganization of silica nanoparticles in equilibrated and miscible poly(ethylene oxide) (PEO) and polytetrahydrofuran (PTHF) nanocomposites is presented. Quantitative comparison of microscopic liquid state theory calculations with small-an…
Coherent lattice vibrations are excited and probed with pulses of 10 fs duration in LaMnO(3). The measured frequencies correspond to those of Jahn-Teller stretching and of out-of phase rotations of the oxygen octahedra. Surprisingly, the amplitude and damping rate of both modes exhibit a sharp discontinuity at the Née…
Physically cross-linked, fibrillar hydrogel networks are formed by the self-assembly of β-hairpin peptide molecules with varying degrees of strand asymmetry. The peptide registry in the self-assembled state can be used as a design element to generate fibrils with twisting, nontwisting, or laminated morphology. The mas…
Herein, we report the ambient synthesis of CdSe nanoparticles of widely tunable particle size by a solution route. The proposed protocol uses hydrazine hydrate to form an air-stable complex of selenium. These nanoparticles are characterized by X-ray diffraction, FTIR, optical absorption, photoluminescence, and transmi…
The reaction between N-methydiethanolamine (mdeaH(2)), benzoic acid, FeCl(3), and DyCl(3) yields a decanuclear coordination cluster, [Dy(3)Fe(7)(mu(4)-O)(2)(mu(3)-OH)(2)(mdea)(7)(mu-benzoate)(4)(N(3))(6)] x 2 H(2)O x 7 CH(3)OH (1) whose single crystal structure exhibits three and seven crystallographically distinct Dy…
Abstract Mechanofluorochromism is found for a series of benzofuro[2,3‐ c ]oxazolo[4,5‐ a ]carbazole‐type fluorophores ( 1a – 1d ) having cyano groups as acceptor: grinding of 1a – 1d induces a fluorescent color change with an enhanced quantum yield, and the fluorescent color is recovered by heating or exposure to solv…
Abstract Thin functional films were deposited on aluminum with an atmospheric pressure plasma jet using hexamethyldisiloxane (HMDSO) as precursor. A high dynamic deposition rate on the order of 450 nm · m · min −1 was achieved. Composition and structure of the thin films show a strong dependence on the downstream loca…
A variety of uniform lanthanide orthoborates LnBO 3 (Ln = Gd, Nd, Sm, Eu, Tb, and Dy) microplates have been successfully prepared by a general and facile conversion method. One-dimensional (1D) lanthanide hydroxides were first prepared through a simple hydrothermal process. Subsequently, uniform LnBO 3 microplates wer…
Abstract Certain organic compounds possess the ability to change color under the influence of light, called photochromism. This change is due to ultrafast chemical transition from open to closed ring isomers (photocyclization), which can be used for optical data storage and photoswitching applications. These applicati…
Gold (Au) nanoshells were grown on silica nanoparticles with differing average diameters, ranging from 30 to 120 nm. Au nanoshells were also formed on silica spheres encapsulating 5 nm diameter magnetic iron oxide nanocrystals. The optical absorbance spectra of these Au nanoshells are reported. The plasmon resonance w…
Abstract Resins containing plant oil‐based cross‐linkers were studied with two reactive diluents: a styrene and an acrylated fatty acid methyl ester‐based (AFAME) monomer. Acrylated epoxidized soybean oil and maleinated castor oil monoglyceride were bio‐based cross‐linkers used. The viscosity and mechanical properties…