Materials Literature
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Two series of novel aromatic polyamides containing pendent dimethyltriphenylamine moieties were prepared based on N, N -bis(4-aminophenyl)- N ′, N ′-di(4-methylphenyl)-1,4-phenylenediamine ( 4 ) and N,N -bis(4-carboxyphenyl)- N ′,N ′-di(4-methylphenyl)-1,4-phenylenediamine ( 4′ ). These compounds with similar structur…
The ability of surface-enhanced Raman spectroscopy (SERS) to measure 5-fluorouracil (5-FU) in saliva is presented. The approach is based on the capacity of Raman spectroscopy to provide a unique spectral signature for virtually every chemical, and the ability of SERS to provide microg/mL sensitivity. A simple sampling…
Abstract Organic–inorganic nanocomposite hybrids of styrene butadiene rubber were prepared with various nanofillers like modified and unmodified montmorillonite, sepiolite (SP), hectorite, carbon nanofiber (F), and expanded graphite. Comparison of the nanocomposites against the gum on the basis of mechanical propertie…
A highly porous NiO/polyaniline (PANI) composite film was prepared on ITO glass by combining the chemical bath deposition and electro-polymerization methods, successively. The porous NiO film acts as a template for the preferential growth of PANI along NiO flakes, and the NiO/PANI composite film has an intercrossing n…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTEffects of Global Seawater Chemistry on Biomineralization: Past, Present, and FutureSteven M. Stanley*View Author Information Department of Geology & Geophysics, University of Hawaii, 701 POST Building, 1680 East-West Road, Honolulu, Hawaii 96822* Phone: (443) 600-2435. Fax:…
Helically twisted fibers can be produced by electrospinning liquid-crystalline cellulose solutions. Fiber topographies are studied by atomic force microscopy, scanning electron microscopy (see figure) and polarized optical microscopy. The fibers have a nearly universal pitch-to-diameter ratio and comprise both right-…
Polyaniline (PANI) nanotubes were chemically synthesized from different aqueous buffer solutions: citric acid/phosphate (pH 3 and pH 4 as prepared) and HCl/phthalate (pH 3), beginning with 0.2 M aniline (its presence raises the pH) in the presence of the amino acid alanine and using ammonium persulfate (APS) as the ox…
Beyond-diffraction-limit optical imaging of cells will reveal biological mechanisms, cellular structures, and physiological processes in nanometer scale. Harnessing the photoswitching properties of spiropyran fluorophores, we achieved nanoresolution fluorescence imaging using photoactuated unimolecular logical switchi…
ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTComputational Techniques at the Organic−Inorganic Interface in BiomineralizationJohn H. Harding*, Dorothy M. Duffy, Maria L. Sushko, P. Mark Rodger, David Quigley, and James A. ElliottView Author Information Department of Engineering Materials, University of Sheffield, Sheffi…
Using a precision drop-casting method, a bioinspired hydrogel-capped hair sensory system was created, which enhanced the performance of flow detection by about two orders of magnitude and endowed the sensors with threshold sensitivities that rival those of fish.
In this work, the influence of the temperature (60, 80, and 110 °C) in the production of Raney Ni catalysts was addressed. The catalysts were obtained by alkaline leaching of a Ni−Al alloy, and both the Ni−Al alloy and the leaching process that was evaluated were provided by an industrial partner. The physical−chemica…
We report on our preliminary results in the realization and characterization of a porous silicon (PSi) resonant mirror (RM) for optical biosensing. We have numerically and experimentally studied the coupling between the electromagnetic field, totally reflected at the base of a high refractive index prism, and the opti…
Abstract An internal mixer was used to prepare polycarbonate (PC)‐based nanocomposites containing carbon fibers, carbon nanofibers (CNF), and mixtures of the two fillers. The influence of the filler volume fraction, the relative amounts of the two fillers, and the filler orientation relative to the direction of heat f…
The coordination chemistry of new fluorinated dialkoxy-diimino ligands onto Al(III) centers has been studied. Diimino-diols (CF 3 ) 2 C(OH)CR 1 2 C(R 2 )═N−R 3 −N═C(R 2 )CR 1 2 C(OH)(CF 3 ) 2 ( {ON Et NO}H 2, R 1 = H, R 2 = Me, R 3 = C 2 H 4; {ON Cy NO}H 2, R 1 = H, R 2 = Me, R 3 = trans -1,2-cyclohexyl; { Me ON Et NO…
We report on the synthesis and physical chemical characterization of a class of heteroleptic mononuclear cyclometalated bis(phenylpyridine)iridium(III) complexes with tetrazolate chelate ligands, such as the deprotonated form of 2-(1 H-tetrazol-5-yl)pyridine ( PyTzH), 2-(1 H-tetrazol-5-yl)pyrazine ( PzTzH), and 5-brom…
Peculiarities of ferromagnetic resonance response of conducting magnetic bi-layer films of nanometric thicknesses excited by microstrip microwave transducers have been studied theoretically. Strong asymmetry of the response has been found. Depending on the order of layers with respect to the transducer either the firs…
We report a photoinduced change of the coercive field, i.e., a photocoercivity effect (PCE), under very low intensity illumination of a low-doped (Ga,Mn)As ferromagnetic semiconductor. We find a strong correlation between the PCE and the sample resistivity. Spatially resolved dynamics of the magnetization reversal rul…
We report a hydrothermal synthesis method for MgO shell coatings directly onto the surface of ZnO nanowire arrays. The entire process can be carried out below 100 °C. The MgO shells are produced by the addition of 10 mM magnesium nitrate with 0.2 M sodium hydroxide in water, resulting in a shell thickness of up to 8 n…
Template-assisted self-assembly (TASA) is a process in which colloidal aggregates with well-controlled sizes, shapes, and structures are fabricated by dewetting aqueous dispersions of building blocks across surfaces patterned with two-dimensional arrays of templates. Since our first demonstration in 2001, the capabili…
We extend the early time ordering theory of Cahn, Hilliard, and Cook (CHC) so that our generalized theory applies to solid-to-solid transitions. Our theory involves spatial symmetry breaking (the initial phase contains a symmetry not present in the final phase). The predictions of our generalization differ from those…