Materials Literature
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We have fabricated and characterized surface-emitting, spin-polarized light-emitting diodes with a Mn-doped InAs dilute magnetic quantum dot spin-injector and contact region grown by low-temperature molecular beam epitaxy, and an In(0.4)Ga(0.6)As quantum dot active region. Energy-dispersive X-ray and electron energy l…
In this paper report on the synthesis of copper and zinc sulfide nanocrystals (NCs) via the formation of polymetallic thiolate cages. Cu2S NCs derived from Cu–dodecanethiol complex formed well-defined spherers, which were sufficiently monodisperse (with a size distribution of ∼10% standard deviation of approximately 4…
In situ X‐ray experiments were conducted to examine the electric‐field‐induced phase changes in PZT‐5H materials. The X‐ray diffraction profiles at different electric‐field levels were analyzed by peak fitting and were used to identify the occurrence of non‐180° domain switching and phase transition. We found that in…
Der Mix macht's: Die Oberflächenladung von carboxyfunktionalisierten Latexnanopartikeln kann so eingestellt werden, dass hoch stabile Öl-in-Wasser- und Wasser-in-Öl-Emulsionen entstehen. Eine Veränderung des pH-Werts (siehe Bild) oder der Salzkonzentration führt zur Inversion der Emulsionen.
Size does matter: Viologen dications (blue) substituted with dendrons form strong host–guest complexes with molecular tweezers (yellow) in solution and in the gas phase (see picture). Complexation even stabilizes dications which are intrinsically unstable as “naked” species in the high vacuum of a mass spectrometer. A…
Beschichtetes Gold: Kern/Schale-Nanostrukturen entstehen spontan, wenn Goldnanopartikel mit amphiphilen Blockcopolymeren kombiniert werden. Die Polymervernetzung fixiert dann die Nanostruktur topologisch (siehe Bild). Die Dicke der Polymerschale sowie die optischen und chemischen Eigenschaften der gesamten Nanostruktu…
Magnesium aluminate (MgAl 2 O 4 ) spinel powders of irregular and spherical morphologies were obtained from the bi‐component water‐based sols following the sol–gel and sol–emulsion–gel methods, respectively. For the synthesis of the oxide microspheres, the surfactant concentration and viscosity of the sols were found…
Liquid Si infiltration (LSI) of beech wood‐derived biocarbon (C B ) templates at 1550°C yields biomorphous SiSiC ceramics with the morphology of the initial biological preform. The biomorphous SiSiC ceramic consists of solidified Si in the cell lumina, polycrystalline β‐SiC and residual carbon islands located at the p…
CdTe nanowires made by self-organization of CdTe nanoparticles in aqueous media were separately conjugated with complementary biological connectors, such as antigen-antibody and biotin-streptavidin. Transmission electron microscopy images and Forster resonance energy transfer measurements in nanowire superstructures w…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTRole of Topology and Amphiphilicity for Guest Encapsulation in Functionalized Hyperbranched Poly(ethylenimine)sYu Chen, Zhong Shen, Lourdes Pastor-Pérez, Holger Frey, and Salah-Eddine StiribaView Author Information Institut für Orga…
Si quantum dots (QDs) as small as ∼2 nm in diameter have been synthesized by a variety of techniques. Because of quantum confinement and the elimination of bulk or surface defects, these dots can emit light from the near infrared throughout the visible with quantum efficiencies in excess of 10%. The luminescence wavel…
We describe a concise, solid support-based synthetic method for the preparation of cyclic d,l-alpha-peptides bearing 1,4,5,8-naphthalenetetracarboxylic acid diimide (NDI) side chains. Studies of the structural and photoluminescence properties of these molecules in solution show that the hydrogen bond-directed self-ass…
A branched peptide amphiphile system was designed for enhanced recognition of biotin on nanofibers formed by self-assembly of these molecules. Branching at a lysine residue was used to design peptide amphiphiles that are capable of presenting more than one epitope per molecule. We found that biotinylated branched stru…
This review article summarizes briefly some important achievements of our recent reserach on anatase and/or rutile TiO2 thin films, fabricated by helicon RF magnetron sputtering, with good crystal quality and high density, and gives the-state-of-the-art of the knowledge on systematic interrelationship for fabrication…
Hexamolybdate clusters have been embedded through covalent bonds into the main chain of poly(phenylene acetylene)s. These hybrid polymers were synthesized by palladium-catalyzed coupling reactions of a diiodo functionalized cluster with a diethynylbenzene derivative or a diethynyl functionalized cluster with a diiodob…
Spatial and temporal control of the function of DNA with light: In oligonucleotides, protected (“caged”) thymidine can act as a temporary mismatch in base pairing and, for example, prevent transcription. The photolabile caging group can be removed by light (see picture), fully restoring an intact DNA strand.
Silicon, the material par excellence for electronics, is not used for light sources because of the lack of efficient light emitters and lasers. In this review, I will discuss the physical reasons why silicon is not a laser material and some approaches to make it lasing. I will start with bulk silicon, then I will disc…
Photo finish: A polymeric micelle system is formed in aqueous media by electrostatic assembly of an anionic dendrimeric porphyrin and a poly(ethylene glycol)–poly(L-lysine) block copolymer (see picture). The micelles exhibit high photocytotoxicity and stability. The hydrodynamic size (ca. 60 nm) makes this polymeric m…
We evaluate the phase diagram of the "BKS" potential [Phys. Rev. Lett. 64, 1955 (1990)]], a model of silica widely used in molecular dynamics (MD) simulations. We conduct MD simulations of the liquid, and three crystals ( beta -quartz, coesite, and stishovite) over wide ranges of temperature and density, and evaluate…
High-throughput electrochemical methods have been developed for the investigation of Zn1-xCo(x)O films for photoelectrochemical hydrogen production from water. A library of 120 samples containing 27 different compositions (0 <or= x <or= 0.068) was synthesized by automated serial electrochemical deposition. High-throug…