Materials Literature
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Highly cross-linked polystyrene microgel colloids dispersed in an index and density matching solvent provide a system with hard-sphere-like interactions, where gravity effects are effectively minimized. They are a suitable target for time-resolved observations of solidification in purely repulsive systems. We have inv…
Grain boundary engineering has been proposed to increase the lifetime performance of sensitized austenitic stainless steel in aggressive environments. Increased microstructure resistance is typically associated with higher fractions of twin (Sigma3) grain boundaries, but there is uncertainty about the properties and r…
By employing the polyoxometalates (POMs) with different sizes as structural motifs, three new organic−inorganic hybrids based on the multiply Cu-bipy coordination polymeric chain-modified POMs, [Cu(bipy)] 2 [HPMo 12 O 40 ] ( 1 ), {[Cu(bipy)] 4 [GeW 12 O 40 ]}·H 2 O ( 2 ), and {[Cu(bipy)] 4 [Mo 15 O 47 ]}·2H 2 O ( 3 )…
Polymer microspheres with a bone-like mineral coatings are generated via a biomimetic process, and this biodegradable coating is used as a carrier for delivery of biological molecules. Acidic and basic proteins are controllably bound and released from these microspheres, suggesting that this approach can be used for b…
Thermosensitive nanocomposites based on mesoporous SBA-15 silica and poly( N -isopropylacrylamide) (PNIPAAm) have been synthesized via in situ polymerization of monomers deposited on the pore walls. The introduction of monomers and polymerization were examined by Fourier-transform infrared spectroscopy (FT-IR). The st…
Silk is a naturally occurring fibrous protein with a multiblock chain architecture. As such, it has many similarities with synthetic block copolymers, including the possibility for β-sheet crystallization restricted within the crystallizable blocks. The mechanism of isothermal crystallization kinetics of β-sheet cryst…
Considerable enrichment of the lactate (LA) fraction in Poly[(R)-LA-co-(R)-3-hydroxybutyrate (3HB)] has been achieved, reaching up to 47 mol % from the previous 6 mol % [S. Taguchi et al. Proc. Natl. Acad. Sci. U.S.A. 2008, 105 (45), 17323-17327], when recombinant Escherichia coli W3110, harboring the LA-polymerizing…
We present a detailed investigation of the different processes responsible for the optical nonlinearities of silicon nanocrystals at 1550 nm. Through z-scan measurements, the bound-electronic and excited carrier contributions to the nonlinear refraction were measured in presence of two-photon absorption. A study of th…
The hydrogen bonding behavior of a homologous series of small molecule and polymeric urethanes, thiourethanes, and dithiourethanes was investigated in solution, melt, and solid states. The relative hydrogen bonding strengths in both small molecule and polymer systems were evaluated, and the results were compared to th…
Polycrystalline samples of underdoped (Ba 1- x K x )Fe 2 As 2 ( x ⩽0.4) were synthesized and studied by x-ray powder diffraction, magnetic susceptibility, specific heat and 57 Fe-Mößbauer spectroscopy. The structural phase transition from tetragonal to orthorhombic lattice symmetry shifts towards lower temperatures, b…
The gasification process, which increases the number of broken CC bonds and the abundance of particular oxygenated functional groups, is shown to destroy carbon nanotubes (CNTs). The expansion of the defect density and dimensions leads to nonlinear consumption of the CNTs with increasing O dose. Some nanotubes are co…
A crucial bottleneck in developing a hydrogen economy is hydrogen storage. This is particularly true for transportation using hydrogen as the fuel for fuel cells. The U.S. Department of Energy has established specific R&D targets for on-board hydrogen storage. Among the most important targets are system gravimetric/vo…
Abstract Cathodoluminescence (CL) of quartz from metamorphic rocks representing a range of conditions from the garnet grade to the migmatite grade reveals a variety of textures, that is, a function of metamorphic grade and deformation history. Ti concentrations, determined by electron microprobe and ion microprobe, ge…
We present results of transport and magnetic properties and heat capacity measurements on polycrystalline CeFeAsO, PrFeAsO and NdFeAsO. These materials undergo structural phase transitions, spin density wave-like magnetic ordering of small moments on iron and antiferromagnetic ordering of rare-earth moments. The tempe…
We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe 1.7 Co 0.3 As 2 . We find that the two hole Fermi surface pockets at the Brillouin zone center observed in the hole-doped superconducting Ba 0.6 K 0.4 Fe 2 As 2 are absent or very small i…
A novel monolithic multilayered ferrimagnetic– ferroelectric multiferroic heterostructure shows a remarkably large tuning of the magnetic response with an electric field. The heteroepitaxial stack is comprised of a near single crystal yttrium iron garnet (YIG) layer, a ferroelectric barium strontium titanate (BSTO) la…
We report the measurements of the anisotropic magnetization and magnetoresistance (MR) on single crystals of EuFe 2 As 2 , a parent compound of ferro-arsenide high-temperature superconductor. Apart from the antiferromagnetic (AFM) spin density wave (SDW) transition at 186 K associated with Fe moments, the compound und…
Based on an effective two-band model and using the fluctuation-exchange (FLEX) approach, we explore spin fluctuations and unconventional superconducting pairing in Fe-based layer superconductors. It is elaborated that one type of interband antiferromagnetic (AF) spin fluctuation stems from the interband Coulomb repuls…
Four cyanide-linked Fe(III)-Mn(III) complexes were prepared by reacting Mn Schiff bases with a new molecular precursor (PPh(4))[Fe(qcq)(CN)(3)] [1; qcq = 8-(2-quinolinecarboxamido)quinoline anion]. They include a dimeric molecule, [Fe(qcq)(CN)(3)][Mn(3-MeOsalen)(H(2)O)] x 2 H(2)O [2 x 2 H(2)O; 3-MeOsalen = N,N'-ethyle…
A detailed analysis of experimentally obtained temperature-dependent gas-phase kinetic data for the oxygen and carbon monoxide adsorption on small anionic gold (Au(n)(-), n = 1-3), silver (Ag(n)(-), n = 1-5), and binary silver-gold (Ag(n)Au(m)(-), n + m = 2, 3) clusters is presented. The Lindemann energy transfer mode…