Materials Literature
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There has been an increasing effort in designing pharmaceutical particles with controllable properties (quality) such as chemical purity, morphology, size distribution, surface characteristics, and microstrain content. In this paper, we explore the feasibility of oscillatory flow mixing (OFM) in improving the quality…
Compatible solutes such as glycine betaine and proline betaine serve as protein stabilizers because of their preferential exclusion from protein surfaces. To use extracellular sources of this class of compounds as osmo-, cryo-, or thermoprotectants, Bacteria and Archaea have developed high affinity uptake systems of t…
A comparative analysis of the structure and mechanical properties of two elastomeric amorphous and semicrystalline polypropylenes samples, produced with C 2 v -symmetric and chiral C 2 -symmetric ansa -zirconocene catalysts, respectively, is presented. The poorly isotactic polypropylene ( iam -PP) of medium molecular…
Structure analysis of multifunctional nanoparticles could be a complex process. In this paper, we demonstrate the step-by-step techniques used for identifying the structure of the CoFe−Fe 3 O 4 nanoparticles, which are composed of ∼4-nm CoFe cores and covered with ∼3-nm Fe 3 O 4 polynanocrystallites. The techniques de…
Fruits of the laboratory: Dendrimers containing up to six different functional groups can be prepared in multistep one-pot reactions by using a selective manipulation and deprotection strategy (see example). The authors call these multifunctional dendrimers molecular fruit-salad trees; they could function as useful bu…
The spreading of Newtonian fluids on smooth solid substrates is well understood; the speed of the contact line is given by a competition between capillary driving forces and viscous dissipation, yielding Tanner's law $R \propto t^{1/10}$ . Here we study the spreading of non-Newtonian liquids, focusing on the two most…
Kationisches Gold katalysiert die Titelreaktion in stark sauren Lösungsmitteln mit SeVI als stöchiometrischem Oxidans. Bei 180 °C und 27 bar CH4 wurden Katalysatorumsatzzahlen von etwa 30 und Methanolkonzentrationen von etwa 0.6 M mit Selektivitäten >90 % bestimmt. Nach DFT-Rechnungen sind sowohl AuI als auch AuIII ge…
Abstract Films with a thousand alternating layers of isotactic polypropylene (PP) and polystyrene (PS) were prepared by layer‐multiplying coextrusion. The crystal structure of extremely thin PP layers confined between PS layers was studied by optical light microscopy (OM), atomic force microscopy (AFM), differential s…
The syntheses, crystal structures, and magnetic characterizations of three new hexanuclear iron(III) compounds are reported. Known [Fe(6)O(2)(OH)(2)(O(2)CBu(t))(10)(hep)(2)] (1) is converted to new [Fe(6)O(2)(OH)(O(2)CBu(t))(9)(hep)(4)] (3) when treated with an excess of 2-(2-hydroxyethyl)-pyridine (hepH). Similarly,…
Patterned poly(N-isopropylacrylamide) (PNIPAAm) brushes were fabricated on oxidized silicon wafers by surface-initiated atom transfer radical polymerization of N-isopropylacrylamide from a micropatterned initiator. The patterned surface initiator was prepared by microcontact-printing octadecyltrichlorosilane and backf…
Commonly used time steps in dissipative particle dynamics (DPD) simulations are too large and lead to systematic errors in the computed properties. The main source of errors is the inaccurate integration of the conservative force. This error can be reduced to some extent by constructing a smoother force without any ab…
We investigate the electronic structure and the hole content in the copper-oxygen planes of Hg based high Tc cuprates for one to four CuO2 layers and hydrostatic pressures up to 15 GPa. We find that with the pressure-induced additional number of holes of the order of 0.05e the density of states at the Fermi level chan…
We present ab initio quasiparticle self-energy calculations in crystalline GaAs for cases of intense electronic excitation (~ 10% of valence electrons excited into conduction band), relevant for high-intensity ultra-short pulsed laser experiments. Calculations are performed using an out-of-equilibrium generalization o…
We use molecular dynamics simulations to study the melting of gold icosahedral clusters of a few thousand atoms. We pay particular attention to the behavior of surface atoms, and to the equilibrium shape of the cluster. We find that although the surface of the cluster remains ordered up to the melting T_m, the increas…
Silk fibroin exists in a number of different states, such as silk I and silk II, with different properties largely defined by differences in secondary structure composition. Numerous attempts have been made to control the transitions from silk I to silk II in vitro to produce high-performance materials. Of all the fac…
BACKGROUND: The Hotdog fold was initially identified in the structure of Escherichia coli FabA and subsequently in 4-hydroxybenzoyl-CoA thioesterase from Pseudomonas sp. strain CBS. Since that time structural determinations have shown a number of other apparently unrelated proteins also share the Hotdog fold. RESULTS:…
Clear evidence of ferromagnetic behavior at temperatures >400 K as well as spin polarization of the charge carriers have been observed in ZnMnO thin films grown on Al2O3 and MgO substrates. The magnetic properties depended on the exact Mn concentration and the growth parameters. In well-characterized single-phase film…
An exact analytical solution based on the method of images has been obtained for the description of the electrostatic field in the system comrising of atomic force microscope (AFM)tip, dielectric, and conductor. The solution provides a step towards quantitative modelling of AFM-assisted electrostatic nanolithography i…
Using a symmetry-based atomic scale theory of lattice distortions, we demonstrate that elastic textures, such as twin and antiphase boundaries, can generate intricate electronic inhomogeneities in materials with strong electron-lattice coupling, as observed in perovskite manganites and other functional materials.
cis, cis -1,2,3,4-Tetraphenylbutadiene (TPBD) exhibits aggregation-induced emission (AIE) in the UV-blue band: the photoluminescence (PL) quantum yield of TPBD aggregates can differ from that of molecularly dissolved species by 2 orders of magnitude (>200). When the isolated molecules in solutions are cooled to extrem…