Materials Literature
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In order to obtain copper catalysts with high dispersions at high copper loadings, the gas flow rate and gas composition was varied during calcination of silica gel impregnated with copper nitrate to a loading of 18 wt % of copper. Analysis by X-ray diffraction (XRD), N 2 O chemisorption, and transmission electron mic…
While the helical character of the edge channels responsible for charge transport in the quantum spin Hall regime of a two-dimensional topological insulator is by now well established, an experimental confirmation that the transport in the edge channels is spin-polarized is still outstanding. We report experiments on…
Abstract Nano and submicrometric fibers of poly( D , L ‐lactide) (PDLLA or PLA) were spun from solutions using a solution blow spinning (SBS) apparatus. Fiber morphology and diameter were investigated by scanning electron microscopy as a function of polymer concentration, feed rate, and air pressure. A more systematic…
Core–shell structured up-conversion luminescent and mesoporous NaYF 4:Yb 3+ /Er 3+ @ n SiO 2 @ m SiO 2 nanospheres were prepared by coating mesoporous SiO 2 layers with different thicknesses on NaYF 4:Yb 3+ /Er 3+ nanoparticles via a simple two-step sol–gel process. The obtained sample shows a typical mesoporous struc…
Protein S-thiolation is a post-translational thiol-modification that controls redox-sensing transcription factors and protects active site cysteine residues against irreversible oxidation. In Bacillus subtilis the MarR-type repressor OhrR was shown to sense organic hydroperoxides via formation of mixed disulfides with…
We report on molecular beam epitaxy growth of stoichiometric and superconducting FeSe crystalline thin films on double-layer graphene. Layer-by-layer growth of high-quality films has been achieved in a well-controlled manner by using Se-rich condition, which allow us to investigate the thickness-dependent superconduct…
Block copolymer lithography is a promising approach to massively parallel, high-resolution, and low-cost patterning, but the inherently low etch resistance of polymers has limited its applicability to date. In this work, this challenge is overcome by dramatically increasing the plasma etch contrast of polystyrene- blo…
Many properties of single-walled carbon nanotubes (SWCNTs) make them ideal candidates for sensors, particularly for biological systems. Both their fluorescence in the near-infrared range of 820-1600 nm, where absorption by biological tissues is often minimal, and their inherent photostability are desirable attributes…
A strong intrinsic signal is advantageous over labeling for optical detection of nanoparticles. Intense scattering and absorption by the surface plasmon resonance, which exceeds molecular cross sections, provides a direct method for visualizing noble metal nanoparticles. While two-photon luminescence in gold nanoparti…
Future generations of photoelectrodes for solar fuel generation must employ inexpensive, earth-abundant absorber materials in order to provide a large-scale source of clean energy. These materials tend to have poor electrical transport properties and exhibit carrier diffusion lengths which are significantly shorter th…
Standard approximations to the density functional theory exchange-correlation functional have been extraordinary successful, but calculating formation enthalpies of reactions involving compounds with both localized and delocalized electronic states remains challenging. In this work we examine the shortcomings of the g…
Abstract Highly conductive polypyrrole/graphite nanosheets/Gd 3+ (PPy/nanoG/Gd 3+ ) composites are fabricated via in situ polymerization using p ‐toluenesulfonic acid as a dopant and FeCl 3 as an oxidant. The effects of the graphite nanosheets and Gd 3+ loading on the electrical conductivity are investigated. The maxi…
To study the corrosion behavior of second phase particles in zirconium alloys, Zr(Fex, Cr1−x)2 (x=1, 2/3, 1/3) metallic compounds which have the same composition as the second phase particles in Zr-4 alloy were prepared by vacuum non-consumable arc melting. XRD and energy filtered TEM were employed for analyzing the c…
Carbon nanotube (CNT) films were grown on silicon wafers with and without a nickel layer (Si-CNT and Ni-CNT) via the pyrolysis of iron phthalocyanine. The nickel layer was prepared using the electroless plating method. To study the emission stability of Si-CNT and Ni-CNT cathodes during intense pulsed emission, emissi…
In most organisms, efficient D-galactose utilization requires the highly conserved Leloir pathway that converts D-galactose to D-glucose 1-phosphate. However, in some bacterial and fungal species alternative routes of D-galactose assimilation have been identified. In the so-called De Ley-Doudoroff pathway, D-galactose…
Low fibre strength has always been a disadvantage of natural fibres when used as composite reinforcement. Mechanical treatments are commonly used to separate the technical fibres from stems. These mechanical treatments are known to cause defects in the fibres. The effect of defects on the strength of individual fibres…
The field of drug delivery focuses primarily on delivering small organic molecules or DNA/RNA as therapeutics and has largely ignored the potential for delivering catalytically active transition metal ions and complexes. The delivery of a variety of transition metals has potential for inducing apoptosis in targeted ce…
Flame deposition was used to grow high quality carbon nanofibers (CNFs) on the hydroxyapatite (HA) using methanol as carbon source. The HA was activated with Fe-compound by a dip coating. These CNFs were purified by acid leaching. The as-produced and purified CNFs were characterized by scanning electron microscopy, X-…
Point deletions in enzymes can vary in effect from negligible to complete loss of activity; however, these effects are not generally predictable. Deletions are widely observed in nature and often result in diseases such as cancer, cystic fibrosis, or osteogenesis imperfecta. Here, we have developed an algorithm to mod…
A series of inorganic-organic hybrids K2Na m H9−m [{Ln(GeW11O39)2}{Cu2(bpy)2(μ-ox)}]·nH2O (bpy = 2,2-bipyridine and ox = oxalate; Ln = La, Nd, Sm, Eu, Gd; n = 19, 17, 22, 20, 19; m = 4, 4, 4, 9, 2) were isolated after reacting in a potassium acetate buffer. X-ray structural analyses show that compounds 1–5 are isomorp…