Materials Literature
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Biosynthesis of nanoparticles using microorganisms has attracted a lot of attention in recent years as this route has the potential to lead to synthesis of monodisperse nanoparticles. Here, we report the intracellular synthesis of stable lead sulfide nanoparticles by a marine yeast, Rhodosporidium diobovatum. The PbS…
Abstract This paper describes a layer‐by‐layer (LBL) electrostatic self‐assembly process for fabricating highly efficient antimicrobial nanocoatings on a natural cellulose substrate. The composite materials comprise a chemically modified cotton substrate and a layer of sub‐5 nm copper‐based nanoparticles. The LBL proc…
Whether gold is catalytically active on its own has been hotly debated since the discovery of gold-based catalysis in the 1980s. One of the central controversies is on the O(2) activation mechanism. This work, by investigating aerobic phenylethanol oxidation on gold nanoparticles in aqueous solution, demonstrates that…
Background elimination and improved sensitivity were achieved by time-resolved (TR) detection with a FRET biosensor for traces of biomolecules such as avidin at concentrations down to 4.8 nM. As shown in the picture, UV excitation of biotinylated NaYF4:Ce/Tb nanocrystals triggers energy transfer to fluorescein isothio…
Abstract The glassy carbon electrode was modified with a nickel pentacyanonitrosylferrate film by electrodeposition of Ni and subsequent derivatization with NaPCNF. The film was characterized by XPS and electrochemical methods. Cyclic voltammetry of the NiPCNF onto the GC shows a redox couple (Fe III /Fe II ) with E °…
Abstract Hydroxyapatite/ethylene‐vinyl acetate (HA/EVA) composites were prepared by injection molding and characterized by X‐ray diffraction (XRD) and attenuated total multiple reflection infrared (ATR‐IR) spectroscopy. The nonisothermal crystallization behavior of HA/EVA composites at different cooling rates and with…
Schaltbare Hafteigenschaften: Das neue zwitterionische Material CB-OH (blau) liegt im Gleichgewicht mit dem cyclischen CB-Ring (rot) vor. Jede dieser Formen verleiht dem schaltbaren Material eine von zwei Eigenschaften: CB-OH wirkt abweisend gegen Biomoleküle, der CB-Ring bildet dagegen kovalente Bindungen und wirkt d…
This contribution focuses on the presentation and the comparison of five experimental methods for the determination of the solubilities of the two enantiotropically related crystallographic forms of etiracetam (racemic intermediate to the synthesis of leviteracetam, Keppra, UCB Pharma) in methanol. The five experiment…
Abstract MgO nano‐powder was synthesized using the combustion method and was studied by low temperature VUV spectroscopy under synchrotron radiation excitation. A considerable blue shift (by ∼0.6 eV, see the figure) of UV luminescence excited in intrinsic absorption was revealed in nanocrystalline MgO ceramics. This d…
Dimethyl methylphosphonate (DMMP) is a widely used simulant for chemical warfare agents and pesticides. This work examined the room temperature reaction of DMMP with ozone on alumina-supported manganese oxide. The reaction on the MnO x /Al 2 O 3 surface shows a long period (approximately nine hours) of relatively cons…
A free-energy functional that contains both the symmetry-conserved and symmetry-broken parts of the direct pair correlation function has been used to investigate the freezing of a system of hard spheres into crystalline and amorphous structures. The freezing parameters for fluid-crystal transition have been found to b…
Gelatin is a well-known biopolymer, and it has a long history of use mainly as a gelling agent in the food industry. This paper reports a new method for producing recombinant hydroxylated human-derived gelatin in Pichia pastoris KM71. Three independent expression cassettes encoding for specific length of gelatin, prol…
Pyroglutamic acid (P) racemized spontaneously when heated above its melting temperature, ∼162 °C. No catalysts or solvents were involved in the racemization, and the rate was very temperature-dependent, requiring, for example, > 24.5 h at 160 °C but ∼1.5 h at 210 °C. The degree of racemization was studied indirectly b…
Abstract Nylon 6/carboxylic acid‐functionalized silica nanoparticles (SiO 2 ‐COOH) nanocomposites were prepared by in situ polymerization of caprolactam in the presence of SiO 2 ‐COOH. The aim of this work was to study the effect of carboxylic silica on the properties of the nylon 6 through the interfacial interaction…
The poor solubility and wettability of Candesartan cilexetil (CAN) leads to poor dissolution and hence, low bioavailability after oral administration. The aim of the present study was to improve the solubility and dissolution rate and hence the permeability of CAN by preparing solid dispersions/inclusion complexes. So…
The electronic spectra of long carbon nanotubes (CNTs) can, to a very good approximation, be obtained using the dispersion relation of graphene with both angular and axial periodic boundary conditions. In short CNTs one must account for the presence of open ends, which may give rise to states localized at the edges. W…
This work is aimed at studying the effect of CO 2 on the phase transition of isotactic poly-1-butene (iPB-1) with form III upon heating. The melting behaviors of form III under atmospheric N 2 and compressed CO 2 at different heating rates ranging from 1 to 20 °C/min were investigated using high-pressure differential…
We propose the concept of a graphene-based quantum reflective switch (QRS) for low-power logic application. With the unique electronic properties of graphene, a tilted PN junction is used to implement logic switch function with 103 ON/OFF ratio. Carriers are reflected on an electrostatically induced potential step wit…
Abstract A type of thulium doped tellurite based optical glasses was prepared through conventional melt quenching technique. In the experiments, the effect of different Tm 3+ ion concentration and glass composition on optical properties of (TeO 2 ) (1‐x‐y) (Nb 2 O 5 ) (x) (TiO 2 ) (y) (x=0.05, 0.10, 0.15, and 0.20 mol…
Colloidal gold nanocages (AuNCs) with a wall length of 60 nm and wall thickness of 6 nm were prepared by the galvanic replacement method. The AuNCs were assembled into monolayers with different percents of surface coverage, using the Langmuir–Blodgett technique. The same technique was used to coat the assembled monola…