Materials Literature
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The Ta( CH t Bu)(CH 2 t Bu) 3 complex 1 reacts with the OH groups of a MCM-41 mesoporous silica dehydroxylated at 500 °C to form the monosiloxy surface species [(⋮SiO)Ta( CH t Bu)(CH 2 t Bu) 2 ] 2, with evolution of 1 equiv per Ta of neopentane. Complex 2 leads to a mixture of supported tantalum hydrides [(⋮SiO) 2 Ta(…
A principally new exploit of ionic liquids as an alternative reaction medium in the synthesis of cyano-bridged coordination-polymer nanoparticles is reported. Stable colloid solutions containing nanoparticles of cyano-bridged molecule-based magnets, M)[Fe(CN)6]2/[RMIM][BF4] (M2+=Ni, Cu, Co) and Fe4[Fe(CN)6]3/[RMIM][BF…
In-situ rheo-SAXS (small-angle X-ray scattering) and rheo-WAXD (wide-angle X-ray diffraction) techniques were used to investigate repeated melting and re-formation of the flow-induced shish-kebab precursor structure in a once-sheared polyethylene (PE) bimodal blend at the confined quiescent state. The blend consisted…
Protein microspheres have been used in the fields of biomedical imaging and drug delivery, but surface modification for cell targeting has been problematic. We have for the first time used an electrostatic adhesion approach to adhere arginine-glutamic acid-aspartic acid (RGD) containing peptides to the surface of prot…
The interaction of the alpha5beta1 integrin with its ligand, fibronectin, supports numerous adhesive functions and has an important role in health and disease. In recent years, there has been a considerable effort in designing fibronectin-mimetic peptides to target the integrin. However, to date, the therapeutic use o…
Triangelspiel: Zwei aus Dysprosium-Dreiecken aufgebaute Aggregate (ein Baustein ist abgebildet) zeigen eine verschwindende Suszeptibilität bei tiefen Temperaturen, was für Systeme mit einer ungeraden Zahl an ungepaarten Elektronen ungewöhnlich ist. Trotz eines nahezu nichtmagnetischen Grundzustandes wird im thermisch…
[reaction: see text] Oligophenylene precursors based on 1,3,5-tris-(2'-biphenyl)ylbenzene (4a) and 1,4-bis-(2'-biphenyl)yl-2,5-diphenylbenzene (5a) were prepared and utilized for efficient hexabenzocoronene (HBC) synthesis by cyclodehydrogenations. Parent HBC 6a was efficiently synthesized from the 1,3,5-tris-(2'-biph…
An order−order transition from a bicontinious double-gyroid (G) structure to a hexagonally packed cylinder (C) structure induced by an external flow is simulated by using real-space dynamical self-consistent field technique. To simulate the structural change correctly, we introduce a system size optimization technique…
Agarose gels have been applied as templates for the formation of macroporous metal oxide structures. The preparation of the agarose template is extremely simple, and with variation of the agarose content, control over morphology is demonstrated: The average pore size decreases from 180 to 55 nm and the surface area in…
BACKGROUND: Tissue engineering techniques have been employed successfully in the management of wounds, burns and cartilage repair. Current prosthetic alternatives to autologous vascular bypass grafts remain poor in terms of patency and infection risk. Growing biological blood vessels has been proposed as an alternativ…
The linear thermal expansion coefficients a(T) of N2 - C60 solutions with 9.9% and 100% of the C60 lattice interstitials filled with N2 have been investigated in the interval 2.2 - 24 K. The dependence a(T) has a hysteresis suggesting co-existence of two types of orientational glasses in these solutions. The features…
In a recent article (Phys. Rev. B 71, 224402 (2005)), Safonov and Bertram claim "inconsistent" results can occur when applying the "Callen-Welton fluctuation dissipation theorem" to magnetic systems with dissipation. This author strongly disputes these claims, and instead will show that the inconsistencies claimed by…
Abstract This work reports the use of polymer‐layered silicate nanoclays as potential flame retardants in unsaturated polyester resins. Preparation, characterization and flammability properties of polyester‐clay hybrids have been studied. X‐ray diffraction studies have provided evidence that dispersion of functionaliz…
Abstract Biodegradable poly(ϵ‐caprolactone) (PCL) has been covalently grafted onto the surfaces of multiwalled carbon nanotubes (MWNTs) by the “grafting from” approach based on in‐situ ring‐opening polymerization of ϵ‐caprolactone. The grafted PCL content can be controlled easily by adjusting the feed ratio of monomer…
In recent years, in looking for an important photorefractive application, several studies on electro-optic and photoconductive sol-gel responses have been done. A very important effort has been addressed to establish the appropriate induced-orientation procedure, in order to get the highest electro-optic coefficient.…
In this work, we have calculated the vibrational modes and frequencies of the crystalline PPP (in both the Pbam and Pnnm symmetries) and PPV (in the P21/c symmetry). Our results are in good agreement with the available experimental data. Also, we have calculated the temperature dependence of their specific heats at co…
We introduce an algorithm for the reduction of computer generated atomistic polymer samples to networks of primitive paths. By examining network ensembles of Polyethylene and cis-1,4 Polybutadiene melts, we quantify the underlying topologies through the radial distribution function of entanglements and the distributio…
The chemical pathways leading to gamma-prime(L1_2)-nucleation from nondilute Ni-5.2 Al-14.2 Cr at.%, gamma(f.c.c.), at 873 K are followed with radial distribution functions and isoconcentration surface analyses of direct-space atom-probe tomographic images. Although Cr atoms initially are randomly distributed, a distr…
We report experimental observation of Kondo-Fano resonant tunneling in Si-doped GaAs/AlAs multiple quantum wells. The spectrum of differential tunneling conductance at low bias shows a strong temperature dependent resonance, whose peak is split in the presence of a magnetic field, characteristic of a Kondo resonance.…
We combine ab initio density functional theory with transport calculations to provide a microscopic basis for distinguishing between good and poor metal contacts to nanotubes. Comparing Ti and Pd as examples of different contact metals, we trace back the observed superiority of Pd to the nature of the metal-nanotube h…