Materials Literature
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Alpha-helices are the most common secondary structures found in globular proteins. In this report, we analyze the stereochemical and sequence properties of helix-X-helix (HXH) motifs in which two alpha-helices are linked by a single residue, in search of characteristic structures and sequence signals. The analysis is…
Magnetron sputtered SnO2 thin films on fused silica substrates were doped with 3, 5, and 7at.% Co by the ion-implantation technique leading to ferromagnetic order at room temperature. Transmission electron microscopy combined with energy loss spectroscopy confirms the absence of Co clusters which are larger than the r…
Cores for thought: Dendrimers based on an octahedral symmetry and with a central positively charged transition-metal complex have been prepared up to the third generation (see schematic representation). The shape-persistent dendrimers with a high density of aromatic rings are accessible by either a partly convergent s…
Prolonged exposure to gadolinium-based contrast (GBC) appears to be the core pathophysiologic factor in the development of nephrogenic systemic fibrosis (NSF). As the GBC is renally excreted, this condition is predominantly seen only following exposure in patients with severe reductions in renal function. Fortunately,…
Hexagonal boron nitride nanotubes (BNNTs) were synthesized at a low substrate temperature of 800 °C on nickel (Ni) coated oxidized Si(111) wafers in a microwave plasma-enhanced chemical vapor deposition system (MPCVD) by decomposition and reaction of gas mixtures consisting of B(2)H(6)-NH(3)-H(2). The 1D BN nanostruct…
Gadolinium-based contrast (GBC) exposure has recently been linked to the development of nephrogenic systemic fibrosis (NSF) in patients with underlying kidney disease and may in fact be the previously unrecognized trigger for the fibrosing process. As NSF is fairly rare in this patient population, a number of permissi…
Abstract This study is part of a project aiming at a better understanding of polypeptide and protein interactions with a metal surface. A tripeptide (the glutathione, or GSH) was deposited, under ultra high vacuum, on Au (111). From reflection–absorption infrared spectra (RAIRS), GSH was adsorbed in its zwiterrionic f…
Abstract Silicon nanocrystals (Si‐ncs) embedded in a dielectric matrix (e.g. Si 3 N 4 , SiO 2 ) attract significant interest for their use in silicon‐based devices such as memories, light amplifiers, and light emitting diodes. Si‐ncs in an SiO 2 matrix are generally obtained through thermal annealing of silicon‐rich o…
We reported the all electronic demonstration of spin injection and detection in the trilayers with hybrid structure of CoFeB∕GaAs∕(Ga,Mn)As (metal/insulator semiconductor) by probing the magnetoresistance at low temperature from 1.8to30K. Tunneling magnetoresistance (TMR) ratios of 3.8%, 4.7%, 2.9%, and 1.4% at 1.8, 1…
Abstract In creating thin films of polymers by solution processing, a common problem is the undesirable formation of bubbles during the drying process. Practical experience shows that bubbles can be created well below the boiling point of the solvent. Also, it has been observed that the degassing of the polymer soluti…
In this work several complementary techniques have been employed to carefully characterize the sintering and crystallization behavior of CaO–Al 2 O 3 –ZrO 2 –SiO 2 glass powder compacts after different heat treatments. The research started from a new base glass 33.69 CaO–1.00 Al 2 O 3 –7.68 ZrO 2 –55.43SiO 2 (mol%) to…
Hybrid ZnO-carbon nanotubes as well as nanodiamond-carbon nanotubes were synthesized via a straightforward process of plasma enhanced chemical vapor deposition. For the former, ZnO nanoparticles were instantly coated on the tube surface in the final growing process of carbon nanotubes, while for the latter diamond nan…
Abstract The synthesis of poly(methylmethacrylate)‐calcium carbonate nanocomposites via the soapless emulsion polymerization was investigated after the CaCO 3 nanoparticles were modified with different modifying agents. Such three kinds of modifying agents as sodium stearate (SS), oleic acid (OA), and PMMA were used t…
Growing environmental regulations propound the need for a transformation in the current practice of leather making. The conventional dehairing and fiber opening process results in high negative impact on the environment because of its uncleanliness. This process accounts for most of the biochemical oxygen demand and c…
The formation of atomic contrast on the stoichiometric CeO 2 (111) surface imaged by dynamic scanning force microscopy (SFM) operated in the noncontact mode (NC-AFM) is investigated. We reproducibly obtain two stable contrast patterns, namely a pattern of hexagonally ordered disk-like features and a honeycomb type str…
Changes in the dielectric properties during the ferroelectric transition of commercial $\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}$ powders were determined in situ, by analyzing the low-energy-loss region of electron energy loss spectroscopy (EELS) spectra in a transmission electron microscope, at room temperature (ferroe…
The tensile behavior of single-walled nanotubes (SWNTs) having two defects (vacancy or Stone-Wales) positioned next to each other was simulated in this study to investigate the influence of the spatial arrangement of defects on the mechanical properties. The simulations were performed using classical molecular dynamic…
Abstract Silica‐filled styrene–butadiene rubber (SBR) unvulcanizates and their vulcanizates with different rubber/filler interactions were prepared by using several kinds of coupling agents. Tensile tests and electron spin resonance (ESR) measurements were carried out for both unvulcanized and vulcanized samples to ge…
We studied the electronic level structure of assemblies of InAs quantum dots and CdSe nanorods cross-linked by 1,4-phenylenediamine molecules using scanning tunneling spectroscopy. We found that the bandgap in these arrays is reduced with respect to the corresponding ligand-capped nanocrystal arrays. In addition, a pr…
Abstract The effect of diluents on polymer crystallization and membrane morphology via thermally induced phase separation(TIPS) were studied by changing the composition of the mixed‐diluents systematically, in the system of poly(4‐methyl‐1‐pentene) (TPX)/dibutyl‐phthalate (DBP)/di‐ n ‐octyl‐phthalate (D‐ n ‐OP) with T…