Materials Literature
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Fracture toughness of injection-molded PA6/PP blends compatibilized with SEBS-g-MA was studied using deeply double-edge notched tension (DDENT) specimens according to the essential work of fracture procedure. The fracture mechanical studies also included tensile impact tests on the DDENT specimens and characterization…
Bioartificial polymeric materials based on blends of dextran and poly(acrylic acid) were prepared in form of films and characterized in order to evaluate the miscibility of the natural component with the synthetic one. Films with different composition ratios were prepared by solution casting and analyzed by dynamic me…
Plastics that conduct electricity have been of intense interest both for technological applications and basic polymer science. In his Perspective, Scott discusses results reported in the same issue by [Lonergan][1] in which a conducting polymer has been used to fabricate a basic electronic device. Scott places this wo…
Eight new p-hydroxybenzoic acid (PHB) and poly(ethylene terephthalate) (PET) copolymers containing vanillic acid (VA), p-aminobenzoic acid, m-hydroxybenzoic acid, hydroquinone/terephthalic acid (TPA), bisphenol A/TPA, 1,5-naphthalenediol/TPA, 2,7-naphthalenediol/TPA, and 1,4-dihydroxyanthraquinone/TPA as eight third m…
Some of the theories that have been developed to explain the origin of bound rubber are critically reviewed and discussed with respect to published data. Theories for carbon black filled compounds and for silica–silicone rubber mixtures are considered; the phenomena involved are likely to be very different, with clear…
Although in principle semiconductor-metal (Schottky) diodes should be tunable by changing the work function of the metal, such flexibility cannot be achieved in a single device and in practice is often limited by interfacial states that cause Fermi-level pinning. A tunable diode is reported based on a hybrid inorganic…
We introduce Gutzwiller wave functions for multi-band models with general on-site Coulomb interactions. As these wave functions employ correlators for the exact atomic eigenstates they are exact both in the non-interacting and in the atomic limit. We evaluate them in infinite lattice dimensions for all interaction str…
Ab initio electronic structure studies of prototypical polar interfaces of wurtzite III-V nitrides show that large uniform electric fields exist in epitaxial nitride overlayers, due to the discontinuity across the interface of the macroscopic polarization of the constituent materials. Polarization fields forbid a stan…
The morphological stability of two-dimensional islands nucleated on a substrate during vacuum or vapour-phase atom deposition is investigated. Using simple scaling arguments, it is shown that, contrary to expectation, dendritic islands may be converted into compact ones by increasing the deposition rate, provided that…
The quantum-confined Stark effect in single cadmium selenide (CdSe) nanocrystallite quantum dots was studied. The electric field dependence of the single-dot spectrum is characterized by a highly polarizable excited state ( approximately 10(5) cubic angstroms, compared to typical molecular values of order 10 to 100 cu…
An ultrathin (0.7 nm x ~150 nm x ~150 nm) covalent grid consisting primarily of ~2.5-nm squares with ~1.5-nm square voids has been synthesized by two-dimensional cross-linking polymerization of lanthanum(III)bis [5,10,15,20-tetrakis(4-pyridyl)porphyrinate] anion with p -xylylene dibromide, constrained to proceed on a…
We have prepared and characterized photosensitized zinc oxide (ZnO) nanoclusters, dispersed in methanol, using carboxylated coumarin dyes for surface adsorption. Femtosecond time-resolved emission spectroscopy allows us to measure the photo-induced charge carrier injection rate constant from the adsorbed photosensitiz…
Chemical strategies for parallel preparation of nanocrystal based single electron devices and nanocrystal-patterned substrates are presented. The Langmuir-Blodgett technique is used for the preparation of ordered particle monolayers, which are incorporated in solid state capacitance devices. Single electron charging i…
Theoretical descriptions of the spectrum of electronic excitations in real metals have not yet reached a fully predictive, "first-principles" stage. In this paper we begin by presenting brief highlights of recent progress made in the evaluation of dynamical electronic response in metals. A comparison between calculate…
We investigate numerically the interaction of a stream of granular particles with a resting obstacle in two dimensions. For the case of high stream velocity we find that the force acting on the obstacle is proportional to the square of the stream velocity, the density and the obstacle size. This behavior is equivalent…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTAn On/Off Circular Dichroism Signal Reveals a pH Dependent Competition between a Cyclodextrin and a Polyelectrolyte for an Atropisomeric Aromatic GuestSung Yun Yang, Mark M. Green, Gerald Schultz, Salil K. Jha, and Axel H. E. MüllerView Author Information Herman F. Mar…
The condensation of diaminobenzenedithiol with sulfur monochloride leads to the chloride salt of the radical cation of 3,6-dichlorobenzo[1,2- d:4,5- d ‘]bis(1,2,3-dithiazole), dichloro-[BB-123-DTA][Cl], which can be reduced to neutral dichloro-[BB-123-DTA] with triphenylantimony. A similar condensation with selenium t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperconductor-to-Insulator Transition in an Organic Metal Incorporating Magnetic Anions: λ-(BETS)2(FexGa1-x)Cl4 [BETS = bis(ethylenedithio)tetraselenafulvalene; x ≈ 0.55 and 0.43]Hayao Kobayashi, Akane Sato, Emiko Arai, Hiroki Akutsu, Akiko Kobayashi, and Patrick Cass…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTConvenient Preparation of Stable, Narrow-Dispersity, Gold Nanocrystals by Ligand Exchange ReactionsLeif O. Brown and James E. HutchisonView Author Information Department of Chemistry and Materials Science Institute University of Oregon, Eugene, Oregon 97403-1253 Cite t…
Many problems in computational magnetics involve computation of fields which decay within a skin depth $δ$, much smaller than the sample size $d$. We discuss here a novel perturbation method which exploits the smallness of $ε\equiv δ/ d$ and the asymptotic behavior of the solution in the exterior and interior of a sam…