Materials Literature
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In this study, mechanochemical reactions in the ternary system of Al–B 2 O 3 –C were investigated. The starting materials were activated in a planetary ball mill under Argon atmosphere at different times. X-Ray diffraction and scanning electron microscopy (SEM) methods were used to characterize the products. The resul…
Micelle-to-vesicle morphological transition has been achieved by light-induced rapid hydrophilic arm detachment from a star polymer. This provides a remote and clean method to control morphology transition of polymeric assemblies.
Wires with 6 filaments of cores surrounded by a Nb barrier, and Cu, Monel and Glidcop sheath, drawn by Hyper Tech Inc. to diameters of 0.83 mm, have been treated in a Hot Isostatic Pressure process under high Ar pressures. The pressure of the HIP varied in different processes in order to find the optimal sintering con…
Submicrometre x-ray computed tomography (CT), referred to as x-ray nanotomography, is a research area attracting much attention nowadays. The major limiting factors in observing compositional structures and features below the micrometre scale are signal-to-noise ratio and loss of information below the x-ray detector p…
The chiral discrimination mechanism in the resolution of sertraline with mandelic acid was investigated by examining the weak intermolecular interactions (such as hydrogen bond, CH/π, and van der Waals interactions) and molecular packing difference in crystal structures of the resulting diastereomeric salts. A new one…
Ultrafast transient absorption spectroscopy monitors the solution-phase dynamics of 2-phenylthiophene (PT), 2-methyl-5-phenylthiophene (MPT), and 2,4-dimethyl-5-phenylthiophene (DMPT) following excitation to the first singlet excited state. Rapid spectral evolution indicates that structural relaxation on the S(1) pote…
Semiconductor nanowires (NWs) possess a fascinating ability to efficiently collect and trap light into a sub-wavelength volume due to the occurrence of leaky mode resonances. The same confinement ability is manifested by metal nanostructures thanks to the excitation of surface plasmons. Combining the two systems, we s…
We report thermoelectric voltage measurements between the platinum-coated tip of a heated atomic force microscope (AFM) cantilever and a gold-coated substrate. The cantilevers have an integrated heater-thermometer element made from doped single crystal silicon, and a platinum tip. The voltage can be measured at the ti…
Applying developed recently thermodynamic model of adsorption-induced deformation of microporous carbons (Kowalczyk, P.; Ciach, A.; Neimark, A. Langmuir 2008, 24, 6603), we study the deformation of carbonaceous porous materials due to adsorption of methane at 313 K and pressures up to 19 MPa. The internal adsorption s…
The magnetization dynamics of a ferromagnet subjected to an electrical current are described by an extension of the Landau-Lifshitz-Gilbert equation that contains two additional terms, the adiabatic and nonadiabatic spin-transfer torques. First-principles calculations of the nonadiabatic spin-transfer torque parameter…
In spite of the fact that commercial bromelain supplements are available in the market, to date, none of them are produced and formulated from recombinant forms. They are extracted and purified (often partially) from the stem and fruit of pineapple (Ananas comosus). This makes the production of bromelain very difficul…
Excess molar volumes and partial molar volumes were investigated from density measurements for glycerol formal + water mixtures at temperatures from 278.15 to 313.15 K. Excess molar volumes are fitted using Redlich–Kister equation and compared with literature values for other systems. The system exhibits negative exce…
The electron-deficient diatomic boron molecule has long puzzled scientists. As yet, the complete set of bound vibrational energy levels is far from being known, experimentally as well as theoretically. In the present ab initio study, all rotational-vibrational levels of the X (3)Σ(g)(-) ground state are determined up…
The analysis of the elemental composition of aerosol particles by non-destructive grazing incidence X-ray fluorescence analysis (GIXRF) is possible if the particles are deposited on a flat substrate. If those particles exhibit surface areas parallel to the substrate surface, under certain experimental conditions, tota…
Tetrathia[7]helicene ([7]TH)-based complexes substituted at the thienyl ring ends by a ferrocenyl group (Fc) or by a (η 5 -cyclohexadienyl)Mn(CO) 3 derivative have been prepared by Sonogashira coupling reactions starting from the mono- or diiodo [7]TH compounds. The molecular structure of one of the diferrocenyl [7]TH…
Synthetic routes to alkyl and aryl substituted dithiophosphinate salts that contain non-coordinating PPh(4)(+) counter cations are reported. In general, these compounds can be prepared via a multi-step procedure that starts with reacting secondary phosphines, i.e. HPR(2), with two equivalents of elemental S. The synth…
Macromolecular complexes have a huge interest in molecular biology. The comprehension of the biological processes in living systems is directly related to the knowledge of the shape and structure of the formed complex and the process of formation. Although X-ray diffraction, Nuclear Magnetic Resonance and cryoEM can p…
Chemical fractionation of the methanolic extract of leaves of Leiothrix spiralis Ruhland afforded the flavonoids luteolin-6-C-β-D-glucopyranoside (1), 7-methoxyluteolin-6-C-β-D-glucopyranoside (2), 7-methoxyluteolin-8-C-β-D-glucopyranoside (3), 4'-methoxyluteolin-6-C-β-D-glucopyranoside (4), and 6-hydroxy-7-methoxylut…
Stranded on a nanoparticle: For the first time, zeolitic imidazolate framework-8 nanoparticles (ZIFNPs) have been used in an effective fluorescent sensing platform for nucleic acids. The DNA detection is accomplished in two steps: 1) ZIFNPs adsorb and quench the dye-labeled single-stranded DNA probe, and 2) subsequent…
The impact of both confinement and electron correlation on generalized oscillator strengths (GOS's) of endohedral atoms, $A$@C${}_{60}$, is theoretically studied choosing the Xe@C${}_{60}$ $4d$, $5s$, and $5p$ fast electron impact ionization as the case study. Calculations are performed in the transferred to the atom…