Materials Literature
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Abstract The preparative scope of the new structural principle of utilization of azulene skeletons as redox‐active chromophores for the production of stabilized electrochromic materials is demonstrated in several examples. The structural principle takes advantage both of the cyanine‐type polymethine dyes and of the vi…
The hydrothermal treatment of an appropriate suspension of Ba and Fe hydroxides in the presence of a large excess of OH(-) results in the formation of Ba hexaferrite at temperatures as low as 150 degrees C. This low formation temperature enables the synthesis of uniform, ultrafine Ba hexaferrite nanoparticles. These n…
Molten proteins: Warming a freeze-dried powder of a stoichiometric ferritin–polymer ionic construct produces a solvent-free liquid protein that exhibits viscoelastic and thermotropic liquid-crystalline properties at 30 °C (see polarized-light micrograph), and transforms into a Newtonian fluid above 40 °C.
Novel hybrid systems based on styrene−maleic anhydride copolymers (PSMA) and a polyhedral oligomeric silsesquioxane characterized by an amino group as reactive side (POSS-NH 2 ) have been synthesized by one-step reactive blending. The features of the above materials were compared with those of systems based on polysty…
This report shows that thermal treatment is a simple and effective approach to create a polymer crystalline layer on the surface of graphite oxide nanoplatelets (GONPs) in polycaprolactone (PCL) melts. It was found that the crystallization temperature of the PCL increased significantly by nearly 9 degrees C with the i…
Two-photon photoluminescence (TPPL) from gold nanostructures is becoming one of the most relevant tools for plasmon-assisted biological imaging and photothermal therapy as well as for the investigation of plasmonic devices. Here we study the yield of TPPL as a function of the temporal width $\ensuremath{\delta}$ of th…
We review the transport properties of graphene, considering both the case of bulk graphene and that of nanoribbons of this material at zero magnetic field. We discuss: Klein tunneling, transport by evanescent waves when the chemical potential crosses the Dirac point, the conductance of narrow graphene ribbons, the opt…
Hydrogen and deuterium chemisorption on a single layer of graphene has been studied by path-integral molecular dynamics simulations. Finite-temperature properties of these point defects were analyzed in the range from 200 to 1500 K, by using a tight-binding potential fitted to density-functional calculations. On one s…
Boron nitride nanotubes (BNNTs)/polyvinyl formal (PVF) composite films containing high BNNT fractions (up to 10 wt %) are fabricated. After nanotube surface modification with epicatechin gallate molecules—“catechin” (the major component of a Japanese “green” tea)—the efficient improvement of PVF thermal conductivity i…
By muon spin-relaxation measurements on single-crystal specimens, we show that superconductivity in the $A{\text{Fe}}_{2}{\text{As}}_{2}$ $(A=\text{Ca},\text{Ba},\text{Sr})$ systems, in both the cases of composition and pressure tunings, coexists with a strong static magnetic order in a partial volume fraction. The su…
We report the results of a low-temperature (300K-15K) high-pressure (up to 22GPa) Raman study of the Verwey transition in magnetite (Fe3O4). We use additional Raman modes observed below the Verwey transition to determine how the transition temperature changes with the quasihydrostatic pressure. Increase of the pressur…
Conventional computer electronics creates a dichotomy between how information is processed and how it is stored. Silicon chips process information by controlling the flow of charge through a network of logic gates. This information is then stored, most commonly, by encoding it in the orientation of magnetic domains of…
Nanocrystalline ZrO 2 fine powders were prepared via the one-pot reaction followed by annealing from 700 to 1100 °C in air. It is believed that generation of excess oxygen vacancies within nanocrystalline ZrO 2 is primarily responsible for room-temperature tetragonal phase stabilization below a critical size, and the…
A simple, effective method has been demonstrated to immobilize ∼1 nm Au clusters within mesoporous silicas (SBA-15, MCF, HMS) using triphenylphosphine-protected Au 11 (Au 11:TPP) clusters as precursors, which were deposited on the silica surface in an organic medium. A unique feature of this method is the ability to d…
Using the concept of covalent layer-by-layer assembly (covalent LbL), used until now for the elaboration of films from polymers or dendrimers, we have constructed hybrid organic/inorganic surfaces by alternating different layers of amino-functionalized silica nanoparticles (295 nm diameter) and epoxy-functionalized sm…
In polymer:fullerene solar cells, the origin of the losses in the field-dependent photocurrent is still controversially debated. We contribute to the ongoing discussion by performing photo-induced charge extraction measurements on poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C$_{61}$ butyric acid methyl ester solar ce…
In this study, a tubular scaffold composed of polylactide fibers (outside layer) and silk fibroin-gelatin fibers (inner layer) was fabricated successfully by electrospinning. Morphological, biomechanical, and dissolvable properties of the composite scaffolds were examined, in particular, biocompatibility of the scaffo…
We present an application of the Lorentz model in which fits to vibrational spectra or a Kramers Kronig analysis are employed along with several useful formalisms to quantify microscopic charge in unoriented (powdered) materials. The conditions under which these techniques can be employed are discussed, and we analyze…
We report Ferromagnetic Resonance Force Microscopy (FMRFM) experiments on a justaposed continuous films of permalloy and cobalt. Our studies demonstrate the capability of FMRFM to perform local spectroscopy of different ferromagnetic materials. Theoretical analysis of the uniform resonance mode near the edge of the fi…
We propose a model to explain the reduced bimolecular recombination rate found in state-of-the-art bulk heterojunction solar cells. When compared to the Langevin recombination, the experimentally observed rate is one to four orders of magnitude lower, but gets closer to the Langevin case for low temperatures. Our mode…