Materials Literature
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Precise in situ measurements are becoming more important as we seek to identify and harness the unique properties of novel nanomaterials, yet key challenges remain in determining structures with current analytical approaches. We report here an in situ multitechnique approach that permits the real-time measurement of t…
The variation in the surface potential as a function of the ferroelectric polarization of micron scale domains in a thin epitaxial film of Pb(Zr0.48Ti0.52)O3 is measured using mirror electron microscopy. Domains were written using piezoforce microscopy. The surface potential for each polarization was deduced from the…
Luminescent carbon-based materials have been prepared by electrostatic self-assembly of negatively-charged luminescent Eu(III)-complex with imidazolium-functionalized MWCNTs.
Poly(L-lactide-co-ε-caprolactone) nanofibers with heparin incorporated were successfully fabricated by coaxial electrospinning. The morphologies of electrospun nanofibers were studied by scanning electron microscopy (SEM), and a significant decrease in fiber diameter was observed with increasing heparin concentration.…
The ever-increasing flow of information requires new approaches for high-density data storage (HDDS). Here, we present a novel solution that incorporates the easily accessible polymer poly(3,4-ethylenedioxythiophene) (PEDOT) with multistate memory. The electrical addressable polymer is able to store up to five differe…
We investigate the role that order plays in the transfer of charges in the ZnO nano-particle-octylcyanobiphenyl (8CB) liquid crystal system, considered for photovoltaic applications. We have changed the concentration of ZnO nanoparticles in 8CB from 1.18 to 40 wt %. Our results show an improvement in the alignment of…
Visible or sunlight irradiation of high nuclearity cobalt- or nickel-centers containing polyoxometalates (POMs), alone or in association with colloidal TiO2, results in their neat, apparently direct, multielectron reduction. These materials prove very effective in the first example of visible or sunlight driven POM-ba…
Abstract In this study, clay‐dispersed polystyrene (PS) nanocomposites were prepared with the in situ atom transfer radical polymerization method and were subsequently electrospun to form nanofibers 450–650 nm in diameter. The polymer chains extracted from the clay‐dispersed nanofibers exhibited a narrow range of mole…
In 2009, the National Academy for Engineering issued the Grand Challenges for Engineering in the 21st Century comprised of 14 technical challenges that must be addressed to build a healthy, profitable, sustainable, and secure global community (http://www.engineeringchallenges.org). Although crucial, none of the NEA Gr…
The reaction in water of Cu(NO(3))(2)·2.5H(2)O with 2,2'-bipyridine (bipy), 1,10-phenanthroline (phen), or 1,10-phenanthroline-5-amine (phenam), and sodium pyrophosphate (Na(4)P(2)O(7)), at various pHs, afforded three new copper(II)-pyrophosphate complexes, namely, {[Cu(bipy)(cis-H(2)P(2)O(7))](2)}·3H(2)O (1a), {[Cu(p…
A low temperature, high yield hydrothermal route has been discovered for the phase-pure synthesis of the multiferroic BaMF(4) (M = Mg, Mn, Co, Ni, and Zn) family. The synthesis involves the use of CF(3)COOH instead of HF in an aqueous medium and, under the correct conditions, produces pure and polycrystalline BaMF(4).…
A facile method to control the synthesis and self-assembly of monodisperse Ag and Ag(2) S nanocrystals with a narrow-size distribution is described. Uniform Ag nanoparticles of less than 4 nm were obtained by thermolysis of Ag-oleate complexes in the presence of oleic acid and dodecylamine, and monodisperse Ag nanopar…
Graphene on Ru(0001) is contacted with Au tips of a cryogenic scanning tunneling microscope. The formation and conductance of single-atom contacts vary within the moiré unit cell. Density functional calculations reveal that elastic distortions of the graphene lattice occur at contact due to a selectively enhanced chem…
Silicon nanopore membranes (SNM) with monodisperse pore size distributions have potential applications in bioartificial kidneys. A protein resistant thin film coating on the SNM is required to minimize biofouling and, hence, enhance the performance efficiency of SNM. In this work, a zwitterionic polymer, poly(sulfobet…
Two thermoresponsive copolymers based on glycerol were synthesized and tethered onto gold surfaces via SAM formation. Below the LCST protein resistant surfaces were obtained while fibrinogen adsorbed above the LCST. It was demonstrated that these switchable properties can be applied to control fibroblast cell adhesion…
Goldene Aussichten: Nanoporöses Gold (AuNPore) zeigt eine bemerkenswerte katalytische Aktivität für die Oxidation von Organosilanen mit Wasser. Der Katalysator lässt sich leicht zurückgewinnen und wiederholt verwenden, ohne dass Verluste durch Auflösung oder Aktivitätseinbußen auftreten.
The layer-by-layer (LbL) assembly of salt-containing nonstoichiometric polyelectrolyte complexes (PECs) with oppositely charged uncomplexed polyelectrolyte for the fabrication of dewetting-induced porous polymeric films has been systematically investigated. Salt-containing poly(allylamine hydrochloride) (PAH) and poly…
Porous hollow spherical and rod-like silica nanoparticles were obtained via a surfactant templating method adopting hydroxyapatite (HAp) nanoparticles as an etchable core material.
Abstract A new synthetic strategy, the combination of living polymerization of ylides and ring‐opening polymerization (ROP), was successfully used to obtain well‐defined polymethylene‐ b ‐poly(ε‐caprolactone) (PM‐ b ‐PCL) diblock copolymers. Two hydroxyl‐terminated polymethylenes (PM‐OH, M n = 1800 g mol −1 (PDI = 1.1…
In the present study we have found that gold supported on CeO 2 and ZnO with well-defined crystal structures or shapes is an excellent catalyst for the low-temperature (175−225 °C) steam reforming of methanol (SRM). We have compared the active nature of gold dispersed on {0001} surfaces of ZnO nanorods and polyhedra t…