Materials Literature
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Superlattices of colloidal nanocrystals hold the promise of new nanomaterials with tunable properties. The positioning and size of these structures are often poorly controlled after self-assembly from the solution phase, making studies of their properties difficult. We report the fabrication of approximately 100 layer…
Abstract The report shows that simple LbL deposition of positively charged chitosan and negatively charged heparin can be used to efficiently modify the native surface of both NiTi and Ti without any previous treatments. Moreover, mineralization of the polymer multilayers with calcium phosphate leads to surfaces with…
The development of a reliable procedure for removing the viscous coating of viscid silk has allowed the accurate characterization of the tensile behavior of clean flagelliform silk (i.e., silk of the flagelliform gland without the viscous coating synthetised in the aggregate gland). For comparison, tensile tests on na…
Galfenol Fe83Ga17 films are sputtered on Si wafers without, and with Ti or Ti/Cu metallic seed layers in order to obtain a magnetoelastic layer which is sensitive to bending deformations of the compound structure. The layer thicknesses range from 100?nm to 5? ?m. Layer morphology, texture, and the Villari effect are e…
We observe the capture and field ionization of individual atoms near the side wall of a single suspended nanotube. Extremely large cross sections for ionization from an atomic beam are observed at modest voltages due to the nanotube's small radius and extended length. The effects of the field strength on both the atom…
In this letter, we demonstrate for the first time the electrostatically driven assembly of (3-aminopropyl)triethoxysilane (APTES) and HAuCl(4) in aqueous media into novel micrometer-scale supramolecular sheets and their subsequent transformation into small, stable APTES bilayer-capped gold nanoparticles through a ther…
Abstract The potential of ultrafine grained copper as a material for reversible electrical contact is investigated. The influence of grain size and sample size on strength and electrical properties is discussed. The existence of an optimal grain size and the relevance of size effects for the mechanical properties are…
This article describes two synthetic strategies of biodegradable multi-arm star polymers with a polyhedral oligomeric silsesquioxane (POSS) core. The goal is to develop synthetic strategies towards reinforced biodegradable polymers that can potentially be used in hard tissue engineering. The polymers were characterize…
This paper describes the mechanisms by which brittle materials are penetrated by impacting projectiles, links ballistic performance to fracture behavior, and in turn to microstructure, and suggests a route unexplored previously for achieving better armor materials. Fracture patterns on cross sections through partially…
This paper describes a new compound magnetic testing system using magnetic Barkhausen Noise (BN) and Metal Magnetic Memory (MMM) testing technique for stress measurement. BN has become an important nondestructive technique due to its exceptional material and stress characterization capabilities. MMM is recently develo…
Abstract The main objective of this work is to identify spurious effects and propose a corrective method when coupling a particle model involving long–range interaction potentials with a first gradient homogenized model using the Arlequin framework. The most significant spurious effects are generally created by the so…
Here the correlation between the chemical shift in X-ray absorption spectroscopy, the geometrical structure and the formal valence state of the Mn atom in mixed-valence manganites are discussed. It is shown that this empirical correlation can be reliably used to determine the formal valence of Mn, using either X-ray a…
GaN:ZnO solid solutions have been identified as a promising system for photocatalytic or photoelectrochemical water splitting under visible-light irradiation. However, the origin of their activity at longer wavelength with respect to the parent materials (GaN and ZnO) absorbing in the UV spectrum is still matter of de…
The structure of nanoparticles is nonstationary and changes in response to the surface environment where the nanoparticles are situated. Nanoparticle-environment interaction determines the nature of the structure change, an important consideration for evaluating subsequent environmental impact. In this work, we used Z…
Porous chitosan scaffolds with possible tissue engineering applications were synthesized by using lyophilization and supercritical carbon dioxide (sc.CO2) drying technique. 1% Chitosan (CS) solution in aq. acetic acid was treated with 37% formaldehyde solution; the resulting hydrogels were subjected to solvent-exchang…
We report the effects of reduced dimensionality and organic networks on defect reactions in a hybrid solid of PbS (galena). Through first-principles calculations, we demonstrate that formation of the organic−inorganic network increases both the band gap and defect reaction energies. Remarkably, anion vacancies result…
This work deals with the production of zirconium diboride (ZrB 2 )‐based ultra‐high‐temperature ceramic porous bodies using different forming techniques with the aim to obtain a reduction in weight of the final components, to balance the high specific mass of ZrB 2 , useful especially in aerospace applications. A feas…
Abstract meso-Trifluoromethyl-substituted subporphyrin was obtained through an extrusion reaction from meso-trifluoromethyl-substituted heptaphyrin(1.1.1.1.1.1.1) upon combined metallation of Cu(II) and B(III) ions. The subporphyrin exhibited the most blue-shifted Soret-like absorption band among those ever prepared.
The complex OsH(2)Cl(2)(P(i)Pr(3))(2) reacts with pinacolborane, Me(2)NH-BH(3), and (t)BuNH(2)-BH(3) to give the complexes OsH(2)Cl{eta(2)-HBOC(CH(3))(2)C(CH(3))(2)OBpin}(P(i)Pr(3))(2) and OsH(2)Cl(eta(2)-HBNR(1)R(2))(P(i)Pr(3))(2) (R(1) = R(2) = Me; R(1) = H, R(2) = (t)Bu) containing monosubstituted alkoxy- and amido…
Eine große Kapazität für Wasserstoff zeichnet Li-dotierte konjugierte mikroporöse Polymere (CMP) aus. Die isostere Enthalpie der Wasserstoffadsorption in diesen Materialien beträgt bis zu 8.1 kJ mol−1, und bei 77 K und einem Druck von 0.1 MPa (1 bar) wurden 6.1 Gew.-% Wasserstoff adsorbiert.