Materials Literature
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Self-assembled growth of ZnO films modified with -bis(ethylenesulfate)-3,4,9,10-perylene tetracarboxylic acid diimide has been realized by a one-step cathodic electrodeposition. Scanning electron microscopy and X-ray diffraction examination of the hybrid films has revealed morphological and structural changes with inc…
The magnetic properties of the ferroic (1−x)PbFe2/3W1/3O3–xPbTiO3 system with various compositions in the range x∈(0,0.50) were investigated. A magnetodielectric coupling is proved by an anomaly of the magnetic hysteresis loop found in the Curie range of temperatures for the relaxor PbFe2/3W1/3O3 ceramic. Two types of…
The temperature dependence of electron transport was studied in an assembly of ZnO quantum dots. The number of electrons per quantum dot was controlled by the electrochemical potential. For assemblies permeated with organic electrolyte solutions, the electron conductance measured in the linear response regime shows an…
Colloidally dispersed niobium oxide nanosheets obtained by exfoliation of layered niobates HNb(3)O(8) and HTiNbO(5) formed stable liquid crystalline phases; their liquid crystallinity was dependent on the niobate species exfoliated.
Silver thin films were prepared using a spray pyrolysis method, silver acetate as the precursor, and stainless steel, heated at 225 and 300°C, as the substrate. Structural and morphological analyses carried out using X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy methods re…
V 2 O 5 xerogel films prepared with spray deposition have been investigated for their lithium battery applications. The influences of spray deposition and postannealing temperatures on the water content, structure, and electrochemical performance of the films have been studied. Water contents of the V 2 O 5 ⋅ n H 2 O…
( Ca 2.6 Bi 0.4 ) Co 4 O 9 thin films were deposited on MgO single crystal substrates by the spin coating method. Films with different grain sizes (50–500 nm) were obtained by preparing at different temperatures. Films were polycrystalline in nature and oriented preferentially in the (001) direction. Electrical resist…
Strong upconversion luminescence of both Mn2+ and Eu3+ is observed in ZnS:Mn2+, Eu3+ codoped nanoparticles. Laser power dependencies and spectroscopic data show that the upconversion emission is due to two-photon excitation of each specific dopant ion. The relative differences in two-photon excitation cross section re…
Silk fibroin of Bombyx mori is secreted from the posterior silk gland (PSG) as a 2.3-MDa elementary unit, consisting of six sets of a disulfide-linked heavy chain (H-chain)-light chain (L-chain) heterodimer and one molecule of fibrohexamerin (fhx)/P25. Fhx/P25, a glycoprotein, associates noncovalently with the H-L het…
The bolaamphiphile PC-C32-PC with two phosphocholine headgroups and one long C32 alkyl chain (see the space-filling model, left) forms nanofibrils in aqueous solution at room temperature solely by hydrophobic interactions. The gels that result were studied by electron microscopy (image on the right), differential scan…
Molecular dynamics simulations of the calcite-water interface have shown that the free energy of adsorption of water is relatively small compared to the previously calculated enthalpy of adsorption implying a large entropy change and that the free energy profile of a calcium adsorbing on the surface correlates with th…
Abstract Summary: We report on preparing poly(2‐(dimethylamino)ethyl methacrylate) (PDMAEMA) gradient substrate, wherein molecular weight (MW) and grafting density ( σ ) of the surface‐anchored PDMAEMA chains vary continuously in two orthogonal directions. Such a specimen is used to control the assembly of charged gol…
Ordered mesoporous silicas SBA-15 with high loadings of pendant vinyl groups have been synthesized via co-condensation of tetraethoxysilane (TEOS) and triethoxyvinylsilane (TEVS) templated with a triblock copolymer.
Benzene- or 2,3-naphthalene-ring-expanded tetraazachlorins (TACs), tetraazabacteriochlorins (TABCs), and tetraazaisobacteriochlorins (TAiBCs) have been synthesized by using tetramethylsuccinonitrile as a source of hydrogenated sites. The derived compounds were characterized by using NMR spectroscopy, X-ray crystallogr…
PPV-based polyrotaxanes have been prepared by coupling vinyl boronic acids to aryl iodides in the presence of cyclodextrins, and the crystal structure of a [2]rotaxane of this type has been determined.
We investigate the structural changes in porous silicon multilayers during annealing. Porous silicon multilayers play an important role in layer transfer technologies, where a thin crystalline silicon layer is separated from a wafer and transferred to a foreign substrate. High processing temperatures during epitaxial…
We show that it is possible to use a multichannel electron detector in a zone plate based photoemission spectromicroscopy in a snap shot mode to reduce the total acquisition time for a given counting time by 50% relative to the standard scanning mode while preserving the feature of the spectra. We describe the result…
Abstract Jüngste Fortschritte bei Grundlagenstudien zu Multiporphyrinsystemen geben Aufschluss über die maßgeblichen Strukturparameter für das Molekulardesign von künstlichen Lichtsammelantennen, die die radähnlichen Antennenkomplexe photosynthetischer Purpurbakterien imitieren. “Kovalente” und “nichtkovalente” Ansätz…
A new chiral binaphthyl-strapped iron-porphyrin 4 b that exhibits unprecedented catalytic activity toward the enantioselective epoxidation of terminal olefins was synthesized. Typical enantiomeric excesses (ee) of 90 % were measured with a maximum of 97 % for the epoxidation of styrene, whereas the turnover numbers (T…
The effects of Nafion loading in electrodes on the performance of supercapacitors have been investigated in this work. Electrodes based on carbon material were prepared with Nafion loading varying from 10 to 50 wt %, and the optimal loading was investigated by electrochemical impedance spectroscopy. The capacitors wit…