Materials Literature
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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…
Conjugated polyrotaxanes are conjugated polymeric semiconductors engineered at a supramolecular level by threading the conjugated moiety into molecular macrocycles, such as cyclodextrins (CD). CD-threaded rotaxanes thus provide a class of model compounds with reduced interchain interactions which enable us to explore…
SiGe (C)/Si(C) multiquantum wells have been studied as a thermistor material for future bolometers. A thermistor material for uncooled Si-based thermal detectors with thermal coefficient of resistance of 4.5%/K for 100×100 μm2 pixel sizes and low noise constant (K1/f) value of 4.4×10−15 is presented. The outstanding p…
We report on the electromechanical robustness of graphene in an extreme condition of deformation: uniaxial bending. A large-angle-bent graphene monolayer was obtained with a predefined template. Structural/mechanical analysis is conducted, followed by electronic transport measurement. Raman spectroscopy analysis sugge…
Hydrogen-bonding pyrazolyl and imidazolyl motifs are incorporated into organoplatinum(II) complexes and found to be harmonized with extended π–π and PtII⋯PtII interactions to align the planar cations into a quasi-1-D columnar structure or a quasi-2D framework. A field-effect electron mobility up to 20 cm2V−1s−1 has be…
A recent and promising development in the field of renewable energy is the use of molecular containers (cyclodextrins, cucurbiturils, Cram-type hosts, and calixarenes) to bind encapsulated chromophores or redox-active compounds to the surface of TiO2 nanoparticles and other nanostructured wide bandgap metal oxide semi…
Biocompatible glyco-dendronized poly-l-lysine (PLL) polymers carry either three or nine mannose- or galactose-bearing dendrons that selectively bind, and thus can be used to detect, bacteria. Central to the synthesis of glyco-dendronized polymers was the development of a continuous flow [2 + 2] photocycloaddition reac…
Highly exfoliated graphite (HEG) containing multi-, bi- and monolayer graphenes has been prepared from an alternative class of precursors – fluorinated graphite intercalation compounds, namely, poly(dicarbon fluoride) intercalation compounds C2F·xR. Treatment of HEG by mixture of concentrated nitric and sulfuric acids…
We fabricated high-mobility δ-doped structures in SrTiO3 thin films in order to investigate the low temperature electronic transport properties of confined carriers in this system. An enhancement of the electron mobility above the bulk value was observed as the doped layer thickness decreased. High-field Hall measurem…