Materials Literature
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We adopt fringe counting from classical moiré interferometry on moiré patterns observed in scanning tunneling microscopy of strained thin films on single crystalline substrates. We analyze inhomogeneous strain distribution in islands of CeO2(111) on Cu(111) and identify a generic source of strain in heteroepitaxy--a t…
The role of interparticle interactions and the morphology in the magnetic behavior of dense assemblies of Fe nanoparticles with concentration well above the percolation threshold has been studied using the Monte Carlo simulations technique. The initial and temperature-dependent magnetization curves have been calculate…
Polymer (XAD7HP)/Ti 4+ nanocomposites were prepared through the swelling of polymer in titanium (IV) ethoxide as a titanium dioxide precursor. The nanocomposite beads exhibit relatively high porosity different than the porosity of the initial polymer. Thermal treatment of composite particles up to 200 °C in vacuum cau…
A new synthetic strategy to prepare dendrimers using a single, inexpensive monomer is described. Divergent growth relies on a highly efficient, metal-free Click cycloaddition of azides to alkynes. Functional dendrimers are obtained with minimal purification in high yields, with no by-product but a water soluble salt,…
Small lithium ammonia clusters are model systems for the dissociation of metals into solvated cations and electrons in ammonia. Metal-ammonia solutions display a complex behavior with increasing metal concentration including a phase change from a paramagnetic to a metallic diamagnetic phase, and small clusters should…
The coordination chemistry of an asymmetric dinucleating hexadentate ligand LH(2) comprising neutral alkyltriamine and potentially dianionic dicarboxamido-pyridyl donor sets with copper, palladium, and platinum has been explored. Monometallic, dicopper, and heterodinuclear Cu-Pd and -Pt complexes have been prepared an…
Deep trap spectra in AlGaN/GaN high electron mobility transistor structures grown on Si by metalorganic chemical vapor deposition show four major electron traps (Ec—0.15, 0.29, 0.40 and 0.76 eV) in the AlGaN barrier/interface region and three (Ec—0.18, 0.27 and 0.45 eV) in the undoped GaN buffer region. The presence o…
We explore how the atomic-scale structural and chemical properties of an oxide-supported monolayer (ML) catalyst are related to catalytic behavior. This case study is for vanadium oxide deposited on a rutile α-TiO2(110) single-crystal surface by atomic layer deposition (ALD) undergoing a redox reaction cycle in the ox…
We design three-dimensional models of topological insulator thin films, showing a tunability of the odd number of Dirac cones driven by the atomic-scale geometry at the boundaries. A single Dirac cone at the Γ-point can be obtained as well as full suppression of quantum tunneling between Dirac states at geometrically…
The recent proliferation of correlated percolation models--models where the addition of edges and/or vertices is no longer independent of other edges and/or vertices--has been motivated by the quest to find discontinuous percolation transitions. The leader in this proliferation is what is known as explosive percolatio…
AIMS: To isolate, identify and characterize new thermophilic cellulolytic bacterial strains from a compost sample. METHODS AND RESULTS: Two thermophilic and cellulolytic bacterial strains were isolated via enrichment on cellulose (milled filter paper) and characterized. Both strains, CS7 and CS8, were rod-shaped, Gram…
The identification of protein kinase targets remains a significant bottleneck for our understanding of signal transduction in normal and diseased cellular states. Kinases recognize their substrates in part through sequence motifs on substrate proteins, which, to date, have most effectively been elucidated using combin…
We study numerically the influence of confinement on the solid fraction and on the structure of three-dimensional random close-packed granular materials subject to gravity. The effects of grain shape (spherical or polyhedral), material polydispersity, and confining wall friction on this dependence are investigated. In…
Collagen VI and WARP are extracellular structural macromolecules present in cartilage and associated with BM suprastructures in non-skeletal tissues. We have previously shown that in WARP-deficient mice, collagen VI is specifically reduced in regions of the peripheral nerve ECM where WARP is expressed, suggesting that…
We present a theoretical approach to describe the two-dimensional (2D) transport properties of the surfaces of three-dimensional topological insulators (3DTIs) including disorder and phonon scattering effects. The method that we present is able to take into account the effects of the strong disorder-induced carrier de…
Hybrid organic–inorganic alucone films have been deposited using trimethylaluminum and ethylene glycol by molecular layer deposition (MLD). The stability of the coatings was monitored in ambient as well as in dry air. Alloys have also been deposited using alucone and Al2O3. The effect of thermal annealing as a functio…
A nanophysics tale of ``The Princess and the Pea'' reenacted with graphene sheets, SiO${}_{2}$ nanoparticles, and an atomic force microscope provides a way to a deeper understanding of graphene's mechanical properties and extends the realm of thin-sheet mechanics to the nanoscale limit.
Abstract Functional polynorbornenes (PNBEs) containing pyrrolidine moiety and bis(trifluoromethyl)biphenyl side group were synthesized via ring‐opening metathesis polymerization (ROMP), and the microstructure of polymer chain was characterized by NMR spectroscopy. Poly(N‐3,5‐bis(trifluoromethyl)biphenyl‐norbornene‐pyr…
Potential dual-mode monopropellant/electrospray-capable mixtures of hydroxylammonium nitrate with ionic liquid fuels [Bmim][] and [Emim][] are synthesized and tested for catalytic decomposition in a microreactor setup. The setup is benchmarked using a 30% hydrogen peroxide solution decomposed via silver catalyst. Resu…
In this paper, the dynamics analysis of single walled boron nitride nanotubes (SWBNNT) as a resonant nanomechanical sensor by using the finite element method has been reported. Molecular structural mechanics-based finite element model (FEM) has been developed by using three-dimensional elastic beams and point masses,…