Materials Literature
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A crucial step in the development of implanted medical devices, in vivo diagnostics, and microarrays is the effective prevention of nonspecific protein adsorption from real-world complex media such as blood plasma or serum. In this work, a zwitterionic poly(carboxybetaine acrylamide) (polyCBAA) biomimetic material was…
Abstract Poly(ethylene terephthalate) (PET) sheets of different crystallinity were obtained by annealing. The annealed PET sheets were characterized by the density measurement, differential scanning calorimetry (DSC), ultraviolet (UV)‐visible spectrometry, X‐ray diffraction, and infrared (IR) spectrometry. The density…
Ballistic transport calculations, which are treated exactly within the nearest-neighbor tight-binding theory, on graphene strips connected to a pair of contacts are presented. In strips with high width-to-length ratio, the calculations reveal the presence of groups of resonances from a large number of nonequivalent co…
Abstract The microstructure and defects of the n = 2 Ruddlesden–Popper manganites La 2–2 x Ca 1+2 x Mn 2 O 7 ( x = 0.6, 0.8 and 0.9) were investigated by electron diffraction and high‐resolution transmission electron microscopy. Besides the predominant n = 2 layered structure in the examined compounds, intergrowths wi…
In this paper magnetic field induced strain (MFIS) of an antiferromagnetic γMn–Fe(Cu) is investigated. It is discovered that there is a high reversible MFIS of 1.6% with positive strain parallel to applied magnetic field at 3.8 T and ultimate negative strain of −0.15% at 1 T in the same way parallel to applied magneti…
Abstract The spherulitic morphology and growth, overall isothermal crystallization kinetics and hydrophilicity of PBSU were investigated by POM, DSC and WCA measurements in its miscible blends with PEO. The Hoffman‐Lauritzen equation was employed to analyze the spherulitic growth rates of neat and blended PBSU, which…
We study the formation of the InP on GaAsSb interface grown by molecular beam epitaxy at 450 °C. Using angle resolved x-ray photoemission spectroscopy (XPS), we show that Sb strongly segregates whereas As does not, leading to a Sb-rich InP surface. Similarly, XPS spectra recorded on air-exposed samples reveal oxidized…
Abstract Monomeric tungsten oxo‐aminoalkoxides W(O)(OPr i ) 3 (L) [L = O(CH 2 ) n NMe 2 ; n = 2 (dmae, 1) and 3 (dmap, 2 )] were synthesized by alcohol exchange with [W(O)(OPr i ) 4 ] 2 and characterized spectroscopically. 1, 2 and [W(O)(OPr i ) 4 ] 2 were used as precursors for the aerosol‐assisted chemical vapour de…
In this paper, hydrophobic carbon nanotube (CNT) arrays, ropes, and agglomerates were synthesized through self-organization on quartz substrates with different micro-structures under the same growth condition. On a flat substrate, a uniform woven structure was formed which resulted in a synchronous growth into an arra…
Silicon-based light-emitting devices can be produced by patterning commercial silicon wafers into microscale metal–insulator–semiconductor diodes. In this image, a silicon LED switches from IR (false color – left) to off (middle) to visible (right).
Si mittendrin: Si-dotierte Al44-Superatome bilden ein kubisch-primitives Kristallgitter (siehe Bild; • Al, • Si) in dem Cluster Si@Al56[N(Dipp)SiMe3]12 , der ausgehend von einer metastabilen AlCl-Lösung und dem Si-haltigen Liganden N(Dipp)SiMe3 hergestellt wurde (Dipp=2,6-iPr2C6H3). Das zentrale Si-Atom hat drastische…
Multicolored semiconductor quantum dots have shown great promise for construction of miniaturized light-emitting diodes with compact size, low weight and cost, and high luminescent efficiency. The unique size-dependent luminescent property of quantum dots offers the feasibility of constructing single-color or full-col…
A novel and promising technique for the fabrication of electro-optically active single crystalline organic waveguides from 2-{3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene}malononitrile (OH1) is presented. OH1 is an interesting material for photonic applications due to the large electro-optic coefficients (r333…
Abstract This review provides the origin of the unusually large thermoelectric Seebeck coefficient | S | of a two‐dimensional electron gas confined within a unit cell layer thickness (∼0.4 nm) of a SrTi 0.8 Nb 0.2 O 3 layer of artificial superlattices of SrTiO 3 /SrTi 0.8 Nb 0.2 O 3 [H. Ohta et al., Nature Mater. 6 ,…
Ausdehnung unter Druck: Das Elementarzellvolumen von Graphitoxid erhöht sich in wässrigem Medium unter Druck kontinuierlich, bis es bei 1.3–1.5 GPa ein scharfes Maximum erreicht (siehe Bild, Quadrate). Die Gitterexpansion um maximal 28–30 % beruht auf der graduierlichen Einlagerung von Wasser zwischen den Graphitoxids…
We report air-stable n-type operations of the single-walled carbon nanotube field effect transistors (SWNT-FETs) fabricated with Gd electrodes. Unlike previously reported n-type SWNT-FETs, our devices maintained their n-type operation characteristics in ambient atmosphere for more than two months. The shallow Gd films…
Abstract A 300 µm thick tensile specimen of OFHC copper is subjected to a tensile loading sequence and deformed to a maximal strain of 3.11%. Using the novel three‐dimensional X‐ray diffraction method ‘High angular resolution 3DXRD', the evolution of the microstructure within a deeply embedded grain is characterised i…
Magnetoabsorption spectra of bilayer graphene ribbons with Bernal stacking are studied by the Peierls-coupling tight-binding method. When the magnetic confinement prevails over the quantum confinement, low-energy spectra chiefly exhibit many Landau peaks, which are strongly modified by the inter-ribbon interactions an…
We report a one-step synthesis of magnetic helical mesostructured silica (MHMS) by self-assembly of an achiral surfactant, magnetic nanocrystals with stearic acid ligands and silicate. This core-shell structured material consists of an Fe(3)O(4) superparamagnetic nanocrystal core and a highly ordered periodic helical…
Abstract Calculations and detailed first principle and thermodynamic analyses have been performed to understand the formation mechanism of K 2 Ti 6 O 13 nanowires (NWs) by a hydrothermal reaction between bulk Na 2 Ti 3 O 7 crystals and a KOH solution. It is found that direct ion exchange between K + and Na + plus H +…