Materials Literature
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By making use of a density-functional tight-binding (DFTB) method we studied the electronic and optical properties of ZnSe/ZnS and ZnS/ZnSe core/shell nanoparticles. Our emphasis will be on the atomic charge distribution, electronic energy levels, band gap, excitation spectra, and their variation with the thickness of…
Nanostructured ultrathin films of linear and dendrimeric cationic sexithiophenes, 6TNL and 6TND, respectively, alternated with anionic polycarbazole precursor, poly(2-( N-carbazolyl) ethyl methacrylate- co-methacrylic acid) or PCEMMA32, were successfully fabricated using the layer-by-layer self-assembly deposition tec…
In this study, ZnO nanorod arrays were synthesized on a seeded substrate using the aqueous solution method. The growth rate, morphology, and crystallinity of ZnO nanorods were controlled by tailoring various process parameters and the [Zn(NO 3 ) 2 ]/[C 6 H 12 N 4 ] ratio. A high density of ZnO nanorods with well‐defin…
Based on numerical and experimental analyses, this article proposes an application of the smart structure concept aimed at realizing a bump on an airfoil profile, finalized to reduce transonic drag, through the use of shape memory alloys (SMAs). The ability of morphing the wing profile is functional to maximize the ae…
Colloidal nanorods with linear CdTe/CdSe/CdTe heterojunctions were synthesized by sequential reactant injection. After CdTe deposition at the ends of initially formed CdSe nanorods, continued heating in solution leads to Se-Te interdiffusion across the heterojunctions and coalescence to decreased aspect ratio. The Se-…
Mesoporous carbon monoliths with embedded alumina and silica nanoparticles were synthesized using phloroglucinol and formaldehyde as carbon precursors and poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymer as a soft template. While the carbon mesostructure was not significantly affected by…
We demonstrate a holographic lithography for the fabrication of diverse metamaterial structures by using an optical prism. Cylindrical nanoshells, U-shaped resonator arrays, and double-split ring arrays are obtained experimentally by real time modulating the phase relation of the interference beams. This easy-to-use m…
The interactions of CO with gold clusters are essential to understanding the catalytic mechanisms of CO oxidation on supported gold nanoparticles. Here we report a photoelectron spectroscopy and theoretical study of CO adsorption on a well-defined Au 6 − cluster in Au 6 (CO) n − ( n = 4−9). Previous studies have shown…
Abstract Colloidal particles with magnetic properties have become increasingly important both technologically and for fundamental studies. Here, chemical initiator‐free miniemulsion polymerization of styrene and butyl acrylate has been performed for preparation of magnetic nanocomposite particles with the diameter of…
Arsen im Grundwasser gefährdet die Gesundheit der Bevölkerung in Entwicklungsländer wie Bangladesh. Daher wird dort dringend ein zuverlässiges und transportables Gerät zum Arsennachweis benötigt. Ein hoch empfindliches System, das mithilfe von oberflächenverstärkter Raman-Spektroskopie (SERS, siehe Bild) Arsenat in Wa…
Nanotubes are fabricated by atomic layer deposition (ALD) into nanopore arrays created by anodic aluminum oxide (AAO). A transmission electron microscopy (TEM) methodology is developed and applied to quantify the ALD conformality in the nanopores (thickness as a function of depth), and the results are compared to exis…
The spinel cobalt aluminate has gained interest as a potential photoelectrochemical catalyst for the renewable production of hydrogen. Using band structure theory, we determine the energetics of possible intrinsic point defects in spinel CoAl 2 O 4 and analyze their effect on its electronic and chemical properties. Ex…
Purpose This paper aims to review various techniques used in computational electromagnetism such as the treatment of open problems, helicoidal geometries and the design of arbitrarily shaped invisibility cloaks. This seemingly heterogeneous list is unified by the concept of geometrical transformation that leads to equ…
ITQ-26 was synthesized via the fluoride procedure using 1,3-bis-(triethylphosphoniummethyl)-benzene as the structure-directing agent. The unit cell and space group were initially determined from electron diffraction experiments on individual tilted microcrystals, using material that had been sectioned by ultramicrotom…
Abstract Reaction of the ligand 2,2,2‐tris(2‐aza‐3‐((5‐akloxy)(6‐methyl)(2‐pyridyl))prop‐2‐enyl)ethane (C n ‐tameMe) with Fe(X) 2 · sH 2 O salts afforded a series of spin crossover metallomesogens with general formula [Fe(C n ‐tame)](X) 2 · sH 2 O (s ≥ 0), with n = 6, 10, 12, 14, 16, 17, 18, or 20 and X = ClO 4 − or B…
In order to investigate the effects of strong and well-defined hydrogen bonding on the properties of thermoplastic elastomers (TPEs), we have applied two distinct and strongly dimerizing 2-ureido-4-[1 H ]-pyrimidinone (UPy) quadruple hydrogen-bonding units as physical cross-linker. While the UPy groups consequently se…
The photophysical properties, such as the UV-vis absorption spectra, triplet transient difference absorption spectra, triplet excited-state extinction coefficients, quantum yields of the triplet excited state, and lifetimes of the triplet excited state, of 10 novel zinc phthalocyanine derivatives with mono- or tetrape…
In Wasser-in-Öl-Mikroemulsionen wurden Nanokristalle des porösen dreidimensionalen Koordinationsnetzwerks [Fe(pz)Pt(CN)4]⋅n H2O (pz=Pyrazin; n≤2.5) synthetisiert. Die tensidfreien Nanokristalle geben bereitwillig Wasser ab. So werden wasserfreie Verbindungen erhalten, deren elektronische Bistabilität sich in einem Far…
Colloidal suspensions of small silicon nanoparticles (diameter around 2 nm) with fast and efficient ultraviolet–blue photoluminescence (PL) band are fabricated by enhanced electrochemical etching of Si wafers. The detailed study of photoluminescence excitation spectra in a wide range of excitation photon energies (270…
The present study highlights the efficient fluorescence resonance energy transfer from Rhodamine 6G dye to Au@ZnO core−shell nanoparticle by steady state and time-resolved spectroscopy. The calculated energy transfer efficiencies from dye to nanoparticles are 41.3, 52.6, and 72.6% for Au, mixture of Au and ZnO, and co…