Materials Literature
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The structure and dielectric properties of (As 2 S 3 ) 100 − x (SbSI) x glasses and their transformation during the heat treatment have been investigated. It has been determined that all glassy alloys have a microgeterogeneous structure. It has been shown that anomalies on the temperature dependences of dielectric per…
Low-temperature adsorption of carbon monoxide on an ordered periodic mesoporous organosilica (1,4-phenylenesilica PMO) was studied by means of infrared spectroscopy and theoretical calculations on cluster models. Basically, three types of adsorbed CO species were found to be simultaneously formed at a low CO coverage:…
Reactions of Group 8 metal ethynyls with tetracyanoethene afford tricyanovinylethynyl-metal derivatives, M{C[triple bond]CC(CN)=C(CN)(2)}(PP)Cp' [2; M = Ru, Os; PP = (PPh(3))(2), dppe; Cp' = Cp, Cp*; not all combinations]; a similar reaction occurs with the vinylidene RuCl(=C=CHPh)(PPh(3))Cp. Further replacement of a…
ZnO nanorod arrays were grown on a GaN/sapphire substrate in a controllable way using a hydrothermal growth method. Proton beam writing (PBW), a direct-write 3D lithographic technique, was used to pattern a polymethyl methacrylate (PMMA) mask spin-coated on to a GaN substrate. ZnO, which has the same wurtzite crystal…
Interdigitated hybrid films consisting of cadmium sulfide (CdS) nanorod arrays and interpenetrating polybithiophene have been synthesized by electrochemical depositions. The vertically aligned CdS nanorods were self-assembled on gold-coated glass substrates through a simple cathodic process of an electrolyte solution…
Ceramic samples of solid solution of multiferroic BiFeO 3 with antiferroelectric NaNbO 3 have been obtained by solid-state reaction route. Both antiferromagnet Neel temperature T N and ferroelectric Curie temperature T C were found to decrease with increasing NaNbO 3 content. Some compositions exhibit very high values…
We present a simple method to fabricate blazed gratings used in the extreme-ultraviolet wavelength region. The method uses an argon and oxygen ion beam to etch directly the fused silica substrate through a rectangular profile photoresist grating mask. The blaze angle can be significantly reduced by using oxygen, and t…
The influence of polyoxyethylene-containing polymers on the crystal structure and habit of molybdenum-oxide-based products crystallized from peroxomolybdate solutions was investigated. Polyoxyethylene homopolymers of various molar masses were compared with a polyoxyethylene alkyl ether and a triblock copolymer of poly…
Higher-order organization of perylene bisimide-based trimeric metallocycles, which are constructed by metal-ion-directed self-assembly of the respective ditopic terpyridyl ligands, affords domains of two-dimensional honeycomb-structured nanonetworks (see image) reminiscent of the structural organization of dyes in pur…
We present an approach to calculating second harmonic generation from periodically-structured metal surfaces. It requires the numerical solution of Maxwell's equations at both the first and second harmonic, but the electronic response to these fields is treated by a parametrization scheme developed earlier. Several mo…
In this work, we aim to contribute new data on the dielectric relaxation behavior of suspensions of nonconducting/conducting composite microspheres (polystyrene/ polyaniline, PS/PANI). Then, the dielectric investigation over the frequency range of 40 Hz to 110 MHz has been carried out to display the characteristic of…
A particle-based protein quantification method was developed. The method relies on adsorption of proteins on particles and time-resolved fluorescence resonance energy transfer (TR-FRET). Layer-by-layer (LbL) particles containing europium(III) chelate donor were prepared. A protein labeled with an acceptor was adsorbed…
Thin films of La1-xSrxFeO3 have been prepared by the ALD (atomic layer deposition) technique using La(thd)3 (Hthd = 2,2,6,6-tetramethylheptane-3,5-dione), Sr(thd)2, Fe(thd)3, and ozone as precursors. A so-called ALD window is found in the temperature range 200 to 360 degrees C for LaFeO3. The effect of the pulsing pro…
Anisotropic building blocks are necessary for the self-assembly of complex structures. Methods are reported here for the preparation and characterization of patchy particles. Spherical polymer particles were temporarily bound to a substrate, so that part of their surface is occluded during subsequent surface modificat…
Ligand exchange from oleic acid-capped PbS nanocrystals was used to prepare sodium 2,3-dimercaptopropanesulfonate (DT) functionalized, water-soluble PbS nanocrystals. Oxygen-free aqueous solutions of the PbS-DT nanocrystals were observed to be stable for more than five months. In aerated solutions, the PbS-DT nanocrys…
The anion-exchange reaction of the layered alpha-cobalt hydroxides Co(OH)(1.75)(DDS)(0.25).0.6H(2)O (1) and Co(OH)(1.7)Cl(0.3).0.4H(2)O (3) with carbonate has been investigated. For 3 the reaction proceeds by complete displacement of the interlayer Cl(-) anions by CO(3)(2-) to give Co(OH)(1.7)(CO(3))(0.15).0.6H(2)O (4…
In this study we use the experimental data from a commercial sample of faujasite (Si/Al ∼ 2.5) and we compare the infrared OH stretching bands with periodic density functional calculations of a faujasite unit cell of composition Si 34 Al 14 O 96 H 14 (Si/Al = 2.4). Assuming that O4H is not populated, the computational…
Properties of porous silicon which are relevant for use of the material as a stationary phase in liquid chromatography chips, like porosity, pore size and specific surface area, were determined with high-resolution SEM and N(2) adsorption-desorption isotherms. For the anodization conditions investigated, porosity is b…
Under the influence of a changed environment, amyloid-forming proteins partially unfold and assemble into insoluble beta-sheet rich fibrils. Molecular-level characterization of these assembly processes has been proven to be very challenging, and for this reason several simplified model systems have been developed over…
Experimental demonstrations of metamaterials with negative index of refraction have been limited to microwave and IR frequencies. In this work, a freestanding multilayer thin-film metamaterial showing a strong negative index of refraction at terahertz frequencies is fabricated and characterized. The metamaterial consi…