Materials Literature
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Summary 1. The effect of phosphate on species composition in biofilms was studied under three different phosphate regimes (0.5, 5 and 50 μ m ) in two different multi species communities: one composed of the four diatom species Melosira varians , Nitzschia perminuta , Navicula trivialis and Achnanthes lanceolata and on…
Let's twist again: Reaction of a racemic mixture of secochlorinato nickel(ii) with cholesterol generates separable diastereomers of a novel porphyrinic chromophore containing a direct β-to-o-phenyl linkage. Exchange of the cholesteryl side chain for an ethyl group produces the enantiomeric conformers of the ruffled ma…
The preparation of monoglycerides from fatty methyl esters and glycerol can be carried out in the presence of acid or basic catalysts. Moreover, the use of porous and basic solid catalysts could induce a shape selectivity modifying the monoglyceride selectivity. Lauric (C12), myristic (C14) and stearic (C18) acid meth…
pH-empfindliche Gele: Durch Kupplung von Aminosäure-Substituenten an ein Cyclohexangerüst erhält man niedermolekulare Verbindungen, die in sehr niedrigen Konzentrationen Wasser gelieren. Ihr modularer Aufbau (siehe Bild; AA=Aminosäure(n), X=hydrophiler Substituent, hydrophobe Regionen violett, hydrophile Regionen rosa…
We present calculations for electron affinities, ionization potentials, and quasiparticle gaps for hydrogenated silicon and germanium nanocrystals (quantum dots) with radii up to $14\mathrm{\AA{}}$ or about 800 atoms using real-space ab initio pseudopotentials constructed within the local-density approximation. We sho…
The manganese(III) complexes studied in this report derive from asymmetrical trianionic ligands abbreviated H(3)L(i) (i = 4-6). These ligands are obtained through reaction of salicylaldehyde with "half-units", the latter resulting from monocondensation of different diamines with phenylsalicylate,. Upon deprotonation,…
Abstract Water vapor permeable fabrics were prepared by coating shape‐memory polyurethane (PU), which was synthesized from poly(tetramethylene glycol), 4,4′‐methylene bis(phenylisocyanate), and 1,4‐butanediol, onto polyester woven fabrics. Water vapor permeability and mechanical properties were investigated as a funct…
Unusual ZnO superstructures with nanosheets standing on the backbone of spindle-like rods were synthesized for the first time from a flakelike Zn 5 (OH) 8 Cl 2 ·H 2 O precursor under mild solution conditions without using high temperature or any organic molecular templates. The formation of the ring-like nanosheets st…
Getting the picture: Citrate and other intermediates of the citric acid cycle can be imaged by time-resolved fluorescence with a Eu3+ tetracycline complex as a fluorescent probe (see picture). The time resolution enables discrimination between intermediates, and enzymatic conversions are not needed.
A series of narrowly distributed rod−coil diblock copolymers, poly(styrene- block -(2,5-bis[4-methoxyphenyl]oxycarbonyl)styrene) (PS−PMPCS), were synthesized by 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-mediated living free radical polymerization. Differential scanning calorimetry, wide-angle X-ray diffraction, sma…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRing-Opening Polymerization of ε-Caprolactone Initiated by Natural Amino AcidsJiyan Liu and Lijian LiuView Author Information Department of Polymer Science, College of Chemistry and Molecular Science, Wuhan University, Key Laborator…
It is known that boehmite (AlOOH) nanofibers formed in the presence of nonionic poly(ethylene oxide) (PEO) surfactant at 373 K. A novel approach is proposed in this study for the growth of the boehmite nanofibers: when fresh aluminum hydrate precipitate was added at regular interval to initial mixture of boehmite and…
“Grafting from” surface-initiated atom transfer radical polymerization (ATRP) techniques were used to synthesize semifluorinated diblock copolymer brushes from silica substrates. Synthesis of either a polystyrene or poly(methyl acrylate) homopolymer brush was performed first (inner block) followed by polymerization of…
We report high-pressure Raman measurements (up to 27 GPa) on the perovskite-type relaxor ferroelectric ${\mathrm{BaTi}}_{0.65}{\mathrm{Zr}}_{0.35}{\mathrm{O}}_{3}({\mathrm{BTZ}}_{35}).$ Distinct changes of the Raman spectra with increasing pressure illustrate that ${\mathrm{BTZ}}_{35}$ presents important pressure inst…
We introduce a class of damage models on regular lattices with isotropic interactions, as e.g. quasistatic fiber bundles. The system starts intact with a surface-energy threshold required to break any cell sampled from an uncorrelated quenched-disorder distribution. The evolution of this heterogeneous system is ruled…
The nucleation and growth kinetics of highly ordered nanocrystal superlattices during the evaporation of nanocrystal colloidal droplets was elucidated by in situ time resolved small-angle x-ray scattering. We demonstrated for the first time that evaporation kinetics can affect the dimensionality of the superlattices.…
Natural silicon consists of three stable isotopes with atomic mass 28 (92.21%), 29 (4.70%) and 30 (3.09%). To present day, isotopic enrichment of Si was used in electronics for two goals: (i) fabrication of substrates with high level of doping and homogeneous distribution of impurities and (ii) for fabrication of subs…
We study the dependence of perpendicular-current magnetoresistance in magnetic multilayers on the angle between the magnetizations of the layers. This dependence varies with the thickness of one of the layers, and is different for multilayers with two and three magnetic layers. We derive a system of equations represen…
The low-energy part of vibration spectrum in ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN) relaxor ferroelectric was studied by inelastic neutron scattering. We observed the coexistence of a resolution-limited central peak with strong quasielastic scattering. The line width of the quasielastic compo…
Vibrational mode frequencies and damping are calculated for an elastic sphere embedded in an infinite, homogeneous, isotropic elastic medium. Anisotropic elasticity of the sphere significantly shifts the frequencies in comparison to simplified calculations that assume isotropy. New low-frequency Raman light scattering…