Materials Literature
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Ab initio calculations based on density functional theory have been performed to determine the relative stabilities and migration of H and He atoms in hcp-Sc. The results show that the formation energy of an interstitial H or He atom is smaller than that of a corresponding substitutional atom. The tetrahedral (T) inte…
The cross-linking process of a complex system was studied at elevated temperature. Partially hydrogenated poly(acrylonitrile- co -1,3-butadiene)/dicumyl peroxide compound was selected as a representative complex polymer/cross-linking agent system. On the basis of the mechanisms of cross-linking reactions, an expressio…
A series of trivalent lanthanide hydroxysulfates, Ln(OH)SO(4), (Ln = Pr through Yb, except radioactive Pm) has been synthesized via hydrothermal methods from Ln(2)(SO(4))(3)·8H(2)O by reaction with aqueous NaOH at 170 °C in Teflon lined Parr steel autoclaves, and were characterized by single crystal X-ray diffraction…
Abstract A model for flow‐enhanced nucleation is presented based on the concept of a polymer melt containing a fixed number of nucleation precursors with a fixed size distribution. Depending on the size, precursors can either be active (i.e. susceptible to nucleation, the characteristic time scale of which is governed…
Zebrafisch mit Schalter: Mithilfe eines fluoreszierenden Reporterpeptids gelingt es, die Photoisomerisierung von Azobenzol in vivo abzubilden (siehe Bild). Daraus folgt, dass photochemische Schalter auf Azobenzolbasis allgemein für die räumlich-zeitliche Kontrolle in lebenden Systemen eingesetzt werden können.
Sehr unsichtbar: Bis(pyrrolopyrrol)-Cyanine sind ausgedehnte Chromophore auf der Basis von Diketopyrrolopyrrolen (siehe allgemeine Struktur). Die Verbindungen zeigen eine sehr hohe, schmalbandige Absorption im Nah-Infrarot(NIR)-Bereich und intensive Fluoreszenz bei 1 μm. Da sie im sichtbaren Bereich fast nicht absorbi…
High-purity and doped ZnTe microstructures were synthesized with a single thermal evaporation method. The morphology of doped ZnTe microstructures shows multilayered periodical structure, which is due to the incorporation of In elements. The PL investigation demonstrated that the pure ZnTe microstructures emit only gr…
This work explores the use of "patchy" polymer brushes to control protein adsorption rates on engineered surfaces and to bind targeted species from protein mixtures with high selectivity but without invoking molecular recognition. The brushes of interest contain embedded cationic "patches" composed of isolated adsorbe…
Abstract The potential of contact angle measurements (CAM) as an analytical tool to characterize surface treatments or modifications is often not fully exploited. Agreeing with Strobel and Lyons, comparing contact angles is often much more reasonable than comparing deduced data like surface energies, because the latte…
We report the self-assembly of monolayers of spider silk-like block copolymers. Langmuir isotherms were obtained for a series of bioengineered variants of the spider silks, and stable monolayers were generated. Langmuir-Blodgett films were prepared by transferring the monolayers onto silica substrates and were subsequ…
Glassy materials have been fundamental to technology since the dawn of civilization and remain so to this day: novel glassy systems are currently being developed for applications in energy storage, electronics, food, drugs, and more. Glass-forming fluids exhibit a universal set of transitions beginning at temperatures…
Chirality is a crucial factor in a single-walled carbon nanotube (SWCNT) because it determines its optical and electronic properties. A chiral angle spanning from 0° to 30° results from twisting of the graphene sheet conforming the nanotube wall and is equivalently expressed by chiral indexes (n,m). However, lack of c…
Three-dimensional (3D)-layered blood vessel constructs consisting of human umbilical artery smooth muscle cells (SMCs) and human umbilical vascular endothelial cells (ECs) were fabricated by hierarchical cell manipulation, and their basic morphology, histology and blood compatibility were evaluated in relation to the…
The synthesis of two gadolinium(III) complexes that exhibit an increase in proton relaxivity in the presence of added Ca(2+) or Zn(2+) ions is reported. The complexes increase their hydration state from zero to one following metal-ion binding, confirmed by spectral measurements on the corresponding Eu(III) complexes.…
Soft x-ray resonant magnetic powder diffraction of the ([Formula: see text]) reflection at the Ni L(2, 3) edges is used to study the magnetic and electronic properties of a series of RNiO(3) materials (with R = Pr, Nd, Eu, Ho and Y) below the metal-insulator transition. The polarization and energy dependence of the re…
Hexagonal BaAl 2 O 4:Eu 2+, Dy 3+ polynary complex nanotubes with long-lasting phosphorescence were obtained through a facile coprecipitation approach followed by a postcalcining reaction in a weak reducing atmosphere. In the case of low annealing temperature, anion vacancies and surface stress can induce lattice cont…
In the present work, the immobilization of gelatin as biopolymer on two types of implantable biomaterials, polyimide and titanium, was compared. Both materials are known for their biocompatibility while lacking cell-interactive behavior. For both materials, a pre-functionalization step was required to enable gelatin i…
We demonstrate a facile fabrication of gold nanostructures including Au nanoplates (NPs), Au nanothorns (NTs), and Au nanowires (NWs) on indium tin oxide substrates via electrochemical growth. A simple two-electrode electrochemical deposition system was applied for the fabrication process. Dense Au nanostructures were…
Formidabel: Die Formen von Goldnanokristallen bestimmen deren Verhalten bei der Selbstorganisation: Rhombododekaedrische Nanokristalle bilden dreieckige Mehrfachschichten (siehe Bild), kubische und oktaedrische hingegen Mono- oder Mehrfachschichten mit schlecht definierten Konturen. Die drei Überstrukturen haben unter…
Cellulose nanofibers from durum wheat straw ( Triticum durum ) were produced and characterized to study their potential as reinforcement fibers in biocomposites. Cellulose was isolated from wheat straw by chemical treatment. Nanofibers were produced via an electrospinning method using trifluoroacetic acid (TFA) as the…