Materials Literature
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Abstract Polyhedral oligomeric silsesquioxanes (POSS ® ) can be added to thermoplastic and thermostable polymers to obtain hybrid materials with only a minor tendency to suffer ignition. The aim of the work reported was to analyse the influence of an octafunctional POSS ® in the pyrolysis of an epoxy/amine system as w…
Abstract Antithrombogenicity is very important for tissue engineering scaffolds used in situations involving contact with blood. A silk fibroin/chitosan (SFCS) scaffold has been developed for liver tissue engineering with porous structure, suitable mechanical properties and biocompatibility. Because the interaction be…
A systematic study of the adsorption of acetone on a TiO 2 (110) surface by means of plane-wave pseudopotential density-functional theory calculations is presented. The relationship between the binding energy of acetone and the degree of surface coverage (up to 0.5 ML) is established on the basis of a partial reductio…
The effect of columnar defects on the pinning properties of NdFeAsO0.85 conglomerate particles, Moore, J D, Cohen, L F, Yeshurun, Y, Caplin, A D, Morrison, K, Yates, K A, McGilvery, C M, Perkins, J M, McComb, D W, Trautmann, C, Ren, Z A, Yang, J, Lu, W, Dong, X L, Zhao, Z X
A comprehensive study of the defects and impurity (Co)-driven ferromagnetism is undertaken in the oxide semiconductors: TiO(2), ZnO and CeO(2). The effect of magnetic (Co(2+)) and non-magnetic (Cu(2+)) impurities in conjunction with defects, such as oxygen vacancies (V(o)), have been thoroughly investigated. Analyses…
A method for directly observing the ferroelectric domain structure by scanning electron microscopy after argon ion milling has been established. Its advantages are exemplified by exposing the domain structure in three widely used ferroelectric ceramics, BaTiO 3 , (Na,K)NbO 3 , and Pb(Ti,Zr)O 3 . Stable high‐resolution…
A current controversy over the nature of fracture in silica glass is revisited in the light of additional experimental evidence obtained by cathodoluminescence (CL) spectroscopy in the immediate crack-tip zone of two different types of silica glass. The Letter describes the dual experimental output obtained by monitor…
Superconductivity and crystalline structure were studied for two nanocomposites consisting of gallium loaded porous glasses with different pore sizes. The superconducting transition temperatures were found to differ from those in known bulk gallium modifications. The transition temperatures 7.1 and 6.7 K were ascribed…
The first observation of bright photoluminescence (PL) corresponding to the inner tubes of double-walled carbon nanotubes (DWNTs) prepared by thermal treatment of fullerene-encapsulated nanotubes at temperatures of 1700–2000°C is reported (see image). The results suggest that DWNTs could replace single-walled NTs in b…
With the relatively new technique of coaxial electrospinning, composite fibres of poly(vinylpyrrolidone) with the liquid crystal 4-cyano-4'-octylbiphenyl in its smectic phase as core material could be produced. The encapsulation leads to remarkable confinement effects on the liquid crystal, inducing changes in its pha…
The conical spin order of multiferroic CoCr(2)O(4) has been studied by a neutron diffraction to investigate its magnetic phase transitions at temperatures below 40 K. Magnetic order of a spiral spin component with an incommensurate propagation vector of (0.63, 0.63, 0) was observed at 26 K, while at 14.5 K, the incomm…
Porous three-dimensional (3D) graphene materials decorated with Ca clusters were studied for application to hydrogen storage with the use of the ab initio methods. It was shown that Ca atoms absorb to the sp 3 -bonded vertex sites of the porous materials more strongly than to other planar graphene sites to form chain…
Uric acid dihydrate (UAD) is a crystalline constituent present in a significant fraction of human renal precipitates. Using a combination of techniques including powder X-ray diffraction, hot-stage light microscopy, differential scanning calorimetry, and thermogravimetric analysis, the mechanism and kinetics of its ir…
We present measurements of the field and angular dependence of the critical current density ( J c ) and melting line made using transport and magnetization techniques for SrFe 1.8 Co 0.2 As 2 (nominal composition) biaxially oriented films. At high magnetic fields the angular dependence of the melting line and J c (for…
Catalysts in a bottle are readily prepared by coelectrospinning of PAMAM dendrimers and poly(ethylene oxide) (PEO). The nanofibers thus obtained can be coated with poly(p-xylylene) by chemical vapor deposition. Removal of the core PEO fibers by extraction with water results in PAMAM dendrimers entrapped in the tubes (…
We present numerical simulations of three-dimensional liquid bridges between two identical smooth and chemically homogeneous cylinders held at a fixed distance and angle one with respect to the other. Despite the limited range of parameters studied, an analysis of resultant forces, energies, and torques reveals a rich…
Hefe im Silicatmantel: Einzelne lebende Zellen wurden mittels schichtweiser Selbstorganisation und biomimetischer Silicatisierung mit Siliciumdioxid ummantelt (siehe Bild). Hefezellen, die einer solchen Behandlung unterzogen wurden, zeigten eine dreifach längere Lebensdauer, und ihre Zellteilung ließ sich durch die Um…
This paper discusses a method for the direct patterning of Au electrodes at nanoscale resolution using dip-pen nanolithography, with proof-of-concept demonstrated by creating single-walled carbon nanotube devices. This technique enables insight into three key concepts at the nanoscale: using dip-pen nanolithography as…
Fluorescence spectroscopy and a range of computer simulation techniques are used to study the structure directing effect of benzylpyrrolidine (BP) and (S)-(-)-N-benzylpyrrolidine-2-methanol (BPM) in the synthesis of nanoporous aluminophosphate frameworks with AFI (one-dimensional channels) and SAO (three-dimensional i…
We present resonant soft x-ray Bragg diffraction data on the space-group forbidden (010) reflection at the $\text{Fe}\text{ }{L}_{2,3}$ edges of magnetoelectric ${\text{GaFeO}}_{3}$. Observed intensities give direct evidence for strange atomic multipoles that violate both time and space inversion, in particular a magn…