Materials Literature
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We study numerically the equilibrium shapes, shape transitions and dislocation nucleation of small strained epitaxial islands with a two-dimensional atomistic model, using simple interatomic pair potentials. We first map out the phase diagram for the equilibrium island shapes as a function of island size (up to N = 10…
Nanofibers with side-by-side morphologies are electrospun from polyacrylonitrile and polyurethane using a microfluidic device. Laminar flow of the two polymer solutions through the device results in nanometer-diameter curly nanofibers with bicomponent cross-sections. The polyurethane half of the nanofibers can be diss…
Nonhydrolytic sol-gel processes in organic solvents have become very popular for the synthesis of metal oxide NCs. We report an affordable, high-yield, shape-control synthesis of MnO multipod nanocrystals with a quick reaction time. The reaction yields exclusively multipods; two to six pod nanocrystals are synthesized…
In this report, we present an acid-sensitive drug delivery vehicle, termed polyketal nanoparticles, which are designed to target therapeutics to the acidic environments of tumors, inflammatory tissues, and phagosomes. The polyketal nanoparticles are formulated from poly(1,4-phenyleneacetone dimethylene ketal) (PPADK),…
A new series of poly( p -phenylenebutadiynylene)s has been synthesized with unique polymer structural features. In these systems each of the p -phenylene units in the conjugated backbone is the core of a rigid three-dimensional iptycene scaffold. The fluorescence quenching properties of these polymers in response to a…
Atomic layer deposition (ALD) is used to deposit 1-600 monolayers of Al(2)O(3) on Ag nanotriangles fabricated by nanosphere lithography (NSL). Each monolayer of Al(2)O(3) has a thickness of 1.1 A. It is demonstrated that the localized surface plasmon resonance (LSPR) nanosensor can detect Al(2)O(3) film growth with at…
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Abstract Thermoreversible gelation of polymer chains bearing hydrogen‐bonding functional groups is studied by off‐lattice Monte Carlo simulation with semiflexible bead‐and‐spring model chains. To see the formation of zipper‐like sequential crosslink junctions ( domino effect ), we introduce stabilization energy −Δε be…
Photoinduced electron-transfer and electron-mediation processes from the excited triplet state of zinc tetraphenylporphyrin (3ZnTPP) to the hexyl viologen dication (HV2+) in the presence of oxo-acetato-bridged triruthenium clusters, [Ru3(mu3-O)(mu-CH3CO2)6L3]+, have been revealed by the transient absorption spectra in…
Mutants of the Micromonospora viridifaciens sialidase, Y370E and Y370F, are catalytically active retaining enzymes that operate by different mechanisms. Previous substitutions with smaller amino acids, including Y370D, yielded inverting sialidases. At least one water molecule can fit into the active-site cavity of thi…
We study the evolution of strain, morphology and interfacial structure during the growth at 250 \ifmmode^\circ\else\textdegree\fi{}C and subsequent annealing of MnAs films on GaAs in situ using grazing incidence x-ray diffraction. The MnAs film grows via the formation of relaxed islands which increase in size and fina…
A combined enzymatic, chemical, and analytical approach was used to determine the cross-sectional carbohydrate composition in cellulosic fibers. The outer surface of cellulosic fibers was enzymatically removed layer-by-layer with precise quantitative control, and the monosaccharides in the peelings were subsequently a…
The physical aging of low water content, amorphous starch/water, maltodextrin/water, and maltose/water mixtures in the glassy state was examined using mechanical testing and calorimetry. Stress relaxation measurements showed that upon storage of the glassy materials there was a time-dependent increase in both flexural…
The tangential $G$ band in the Raman spectra of a metallic single-wall carbon nanotube shows two peaks: a higher frequency component having the Lorentzian shape and a lower-frequency component of lower intensity with a Breit-Wigner-Fano (BWF) type of line shape. This interesting feature has been analyzed on the basis…
Effective electromagnetic properties of negative index of refraction metamaterials (NIMs) can be hard to measure. We show through simulations that electromagnetic fields inside a typical, physically realizable wire-SRR (split ring resonator) NIM are more homogeneous than one might expect inside such metamaterials, and…
We calculate the statistical properties of the energy landscape of a minimal model for strong network-forming liquids. Dynamic and thermodynamic properties of this model can be computed with arbitrary precision even at low temperatures. A degenerate disordered ground state and logarithmic statistics for the local mini…
The A‐site cation diffusion in LaFeO 3 has been examined by inter‐diffusion experiments between LaFeO 3 and NdFeO 3 . Dense, polycrystalline bodies were annealed in contact at temperatures between 1100° and 1300°C in ambient air. The bulk‐ and grain‐boundary inter‐diffusion coefficients were calculated from concentrat…
With appropriate choice of conditions, copolymerization of monosubstituted monomers [CH 2 CHX: e.g., styrene, butyl acrylate (BA)] in the presence of small amounts of an α-methylvinyl monomer [CH 2 C(CH 3 )Y: e.g., α-methylstyrene (AMS), methyl methacrylate (MMA), methacrylonitrile (MAN)] and a cobaloxime as chain tra…
Thermionic field emission properties of nitrogen doped ultrananocrystalline diamond (UNCD) coated silicon tip arrays are examined using thermionic field emission electron microscopy (TFEEM). Nitrogen doping has been shown to enhance the emission properties of diamond by the introduction of a donor level $1.7\phantom{\…
We investigate the thermal conductivity of classical spin chains through a Green-Kubo approach using both Monte Carlo and Langevin simulations as well as by direct numerical determination of the microscopic heat transfer processes. All three approaches show that magnetic heat conductivity is normal for all finite temp…