Materials Literature
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We propose an effective permittivity model to homogenize an array of long thin epsilon-negative rods arranged in a periodic lattice. It is proven that the effect of spatial dispersion in this electromagnetic crystal cannot be neglected, and that the medium supports dispersionless modes that guide the energy along the…
The onset of a Griffiths-like phase has been observed in ${\mathrm{Tb}}_{5}{\mathrm{Si}}_{2}{\mathrm{Ge}}_{2}$ (${T}_{C}=110\text{ }\text{ }\mathrm{K}$) by means of magnetic susceptibility and small-angle neutron scattering experiments. We show the growth of a ferromagnetic cluster system characterized by an inverse s…
Intense theoretical and experimental interest has been focused on the possibility of new materials with hardness exceeding that of diamond. However, building the link between the information that first-principles calculations can produce and the hardness of materials remains one of the challenges of computational mate…
Alginate-based nanofibers with an average diameter of ca. 75 nm (see figure) have been fabricated by electrospinning. The nanofiber network has mechanical properties comparable to cartilage. The cellular compatibility is demonstrated with chondrocytes. This natural polymer-based nanofiber network may find application…
Low-leakage BiFeO3 films have been grown with saturated ferroelectric hysteresis loops (see figure) and a very large remanent polarization. The antiferromagnetic nature of BiFeO3 films is confirmed by the appearance of an exchange bias in BiFeO3-based spin-valve multilayers. The results imply that there is potential f…
Pump up the volume: Wet foams prepared with surfactants are thermodynamically unstable systems that undergo rapid disproportionation, drainage, and coalescence. Ultrastable foams have now been prepared using colloidal particles as stabilizers (left picture). The stabilization results from the irreversible adsorption a…
This Account discusses surface-enhanced Raman scattering at extremely high enhancement levels that can occur for molecules attached to silver and gold nanoclusters. Strongly enhanced and highly confined local optical fields enable surface-enhanced Stokes and anti-Stokes Raman spectroscopy of single molecules even unde…
Abstract Changes in cotton fabrics brought about by different swelling agents and different types of finishing procedures have been studied in this work, using a single‐step swelling of cotton in the reagent. Cotton fabrics were treated with different alkalis and mixtures of alkalis and other additives and finished wi…
Hyperbranched polyglycidol (PGLD) was synthesized via anionic ring‐opening polymerization of glycidol using a special anionic initiator with multiple initiation sites. The resultant polymers were characterized by 1H and 13C‐NMR spectra for confirming their structures, which consisted of linear, hyperbranched and dendr…
Abstract Grafting of polymer brushes on the poly(vinylidene fluoride) (PVDF) films was carried out by the surface‐initiated free radical polymerization. Surface‐initiators were immobilized on the PVDF films by surface hydroxylation and esterification of the surface‐tethered hydroxyl groups with 4,4′‐azobis(4‐cyanopent…
Polyimide‐silica hybrid materials have been prepared through the sol‐gel process by mixing various proportions of tetraethoxysilane (TEOS) with polyamic acids (PAAs). Two types of PPAs were employed. The first was obtained by reacting an equimolar mixture of oxydianiline (ODA) and pyromellitic dianhydride (PMDA) in di…
Abstract In this work, we present a theoretical discussion regarding the Flory–Huggins χ interaction parameter for 11 random copolymer‐solvent systems along with their corresponding polymer pairs. Copolymers studied are poly(acrylonitrile‐ co ‐butadiene) in acetonitrile, poly(styrene‐ co ‐acrylonitrile) in 1,2‐dichlor…
Conducting polyaniline doped with polymeric acids was synthesized by a in situ chemical polymerization method. The synthesized polymers were characterized by using UV‐Visible, FT‐IR spectroscopy and SEM analysis. Thermal stability of these polymers was evaluated by using TGA/DSC analysis. Among the three polymeric aci…
Abstract Blending is an important way to obtain materials based on intrinsically conductive polymers and conventional plastics and rubber materials. Much research has been carried out to determine the best performance of materials be used for electrostatic dissipation and electromagnetic interference shielding. Mechan…
This Special Issue on supramolecular approaches to organic electronics and nanotechnology , borne out of a symposium of the European Materials Research Society meeting in 2004, brings together a number of excellent contributions from many leading scientists in supramolecular‐systems research. Stimulating highlights of…
Abstract Poly( L ‐lactic acid) (PLLA)/gelatin blend membranes were prepared by solution casting method and using dimethyl sulfoxide (DMSO) as a cosolvent. Scanning electron microscopy measurement indicated that when the amounts of gelatin in PLLA/gelatin blend membranes are less than 5%, the sizes of phase separation…
The eight-band effective-mass Hamiltonian of the free-standing narrow-gap $\mathrm{InAs}$ quantum ellipsoids is developed, and the electron and hole electronic structures as well as optical properties are calculated by using the model. The energies, wave functions and transition probabilities of quantum spheres as fun…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Abstract The synergy of power ultrasound with screen printed electrodes and screen printed modified electrodes is shown to be possible and beneficial. Proof‐of‐concept is shown for the anodic stripping voltammetry of lead at screen printed electrodes and screen printed calomel modified electrodes offering shorter depo…
Abstract The reaction of poly(allyl azide) (PAA; number‐average molecular weight = 1800 g/mol) with N ‐phenyl maleimide, 4,4′‐bis(maleimidodiphenyl) ether, 4,4′‐(bismaleimidodiphenyl) sulfone, and 1,6‐bismaleimido hexane is described in this article. As indicated by Fourier transform infrared studies, the azido group…