Materials Literature
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Keime verändern alles: Durch einen ungewöhnlich schnellen Kationenaustausch auf Nanometerebene gelingt es, die Keimbildung von Nanokristallen genau zu steuern. Als Modellsystem dienten 3.2–14 nm große PbSe-Nanokristalle, die über eine Keimbildungsreaktion von Pb2+ mit unbeständigen SnSe-Kernen gebildet werden (siehe B…
Indentation-induced deformation behaviour was characterized in nano-scale for bulk polycrystalline materials to understand strengthening factors of macroscopic properties especially for the grain boundary effect. Compared with deformation behaviour in the vicinity of single grain boundary and grain interior of an inte…
An anionic porphyrin, tetrakis(4-sulfonatophenyl)porphyrin (TPPS), was assembled into complex organized molecular films with an l -glutamic acid derivative ( l -GluC18) or octadecylamine (ODA) through in situ complex formation at the air/water interface. TPPS could form J-aggregates when deposited from the pH 3.1 subp…
Statistical distribution of the threshold voltage V th for more than 90 Pt/SrBi 2 Ta 2 O 9 /Hf–Al–O/Si ferroelectric-gate field-effect transistors (FeFETs) is reported for both p- and n-channel devices. The average memory window is nearly 1.2 V at the sweep voltage amplitude of 5 V (between −4 V and 6 V for the p - ch…
Recent simulation studies have drawn attention to the shoulder which forms in the second peak of the radial distribution function of hard spheres at densities close to freezing and which is associated with local crystalline ordering in the dense fluid. We address this structural precursor to freezing using an inhomoge…
Mechanical properties of high quality tetragonal hen egg-white lysozyme single crystals which are one type of protein crystal were investigated by the indentation method. The indentation marks were clearly observed on the crystal surface and no elastic recovery of them occurred. The value of the micro-Vickers hardness…
YbgC proteins are bacterial acyl-CoA thioesterases associated with the Tol-Pal system. This system is important for cell envelope integrity and is part of the cell division machinery. In E. coli, YbgC associates with the cell membrane and is part of a protein network involved in lipid biogenesis. In the human pathogen…
The effects of irradiation by 48 MeV Li 3+ and 150 MeV Ag 12+ ion beams on the thermoluminescence (TL) of BaSO 4 : Eu phosphor are studied. Samples in the form of pellets were exposed to different fluences in the range 1 × 10 9 –5 × 10 11 ions cm −2 . The modifications in TL glow curves of the materials irradiated by…
We study the impurity states in bilayer graphene in the unitary limit using Green's function method. Unlike in single layer graphene, the presence of impurities at two nonequivalent sites in bilayer graphene produces different impurity states, which is understood as the change in the band structure due to interlayer h…
Abstract Oriented ZnO nanorod arrays were prepared on cotton fabrics via a simple two‐step process. The ZnO nanocrystals were first synthesized and coated onto cotton substrates by dip‐pad‐cure process as nucleation seeds, followed by hydrothermal ZnO growth in aqueous solution of zinc nitrate hydrate and hexamethylen…
Abstract We have developed a highly accurate differential deposition system for the fabrication of X‐ray optical devices. Using this system, thin films having a thickness distribution gradually changing along the longitudinal direction on a substrate surface could be produced with sub‐nanometer accuracy. The surface f…
We propose a resonant one-dimensional quasicrystal, namely, a multiple quantum well (MQW) structure satisfying the Fibonacci-chain rule with the golden ratio between the long and short interwell distances. The resonant Bragg condition is generalized from the periodic to Fibonacci MQWs. A dispersion equation for excito…
The commitment step to the aspartate pathway of amino acid biosynthesis is the phosphorylation of aspartic acid catalyzed by aspartokinase (AK). Most microorganisms and plants have multiple forms of this enzyme, and many of these isofunctional enzymes are subject to feedback regulation by the end products of the pathw…
Negative photoplastic effect (NPhE), i.e. the reversible influence of light on the flow stress and hardness in non-crystalline materials (mainly As–S binary chalcogenide glasses for thin-film samples), has been studied through the changes in nanoscale mechanical properties using the nanoindentation technique for vario…
The Rh-embedded mesoporous silica (RMS) with a silica-nanosphere pore wall was successfully synthesized using silica nanospheres as a framework and citric acid as a nonsurfactant template. The RMS had a three-dimensionally interconnected and disordered wormhole-like mesostructure, and its pore size was easily controll…
We report the synthesis, structure, and characterization of a novel ethyne synthon, 1,2-bis(4',4',5',5'-tetramethyl[1',3',2']dioxaborolan-2'-yl)ethyne (B2C2). We demonstrate the utility of B2C2 in the Suzuki-Miyaura polycondensation reaction, synthesizing a water-soluble poly(p-phenyleneethynylene) from [2,5-diiodo-1,…
The four new phosphates BaCo3P4O14 (1), SrCo3P4O14 (2), BaMn3P4O14 (3), and SrMn3P4O14 (4) were hydrothermally synthesized and characterized structurally and magnetically. They are isostructural with ANi3P4O14 (A = Ca, Sr, Pb, Ba), crystallizing in the monoclinic space group P2(1)/c. The CoO6 (or MnO6) octahedra share…
Selenium derivatization (via selenomethionine) of proteins for crystal structure determination via MAD phasing has revolutionized protein X-ray crystallography. It is estimated that over two thirds of all new crystal structures of proteins have been determined via Se-Met derivatization. Similarly, selenium functionali…
Thin solid films of bis benzimidazo perylene (AzoPTCD) were fabricated using physical vapor deposition (PVD) technique. Thermal stability and integrity of the AzoPTCD PVD films during the fabrication ( approximately 400 degrees C at 10(-6) Torr) were monitored by Raman scattering. Complementary thermogravimetric resul…
Magnetically doped CeO2 is a promising dilute magnetic semiconductor and may also be useful in magneto-optical applications. Ce1−xCoxO2−δ (x=0, 0.02, 0.06, 0.15, and 0.25) films were deposited by pulsed laser deposition on MgO(100) substrates and their structural, magnetic, and magneto-optical properties were characte…