Materials Literature
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This article details the design, construction, and operation of flexible system that modulates light exposure for the purpose of fabricating continuous and discrete gradient combinatorial libraries. Designed for versatility, the device combines "off the shelf" components, modular accessories, and flexible computer con…
Polymer through-hole membranes were fabricated by nanoimprinting using metal molds with high aspect ratios, which were prepared by a replication process using an anodic porous alumina template. The introduction of a two-layer structure of polymers and the selective removal of underlying polymer layer allows the format…
Recently, several cases of maloperation of the differential protection with second harmonic blocking due to transformer switching on with load have been reported. Quite a few maloperation occurred at the nonrestraint region of percentage restraint plane. The previous theory cannot be utilized directly to analyze this…
X-ray diffraction, Brillouin, and Raman scattering measurements were performed on Al3+ and H+- bearing stishovite at ambient conditions. Samples with different Al3+ and H+ contents were used to examine the effects of these minor constituents on the density, acoustic velocities, single-crystal and aggregate elastic mod…
Chemical and electrical processes developing at the semiconductor-electrolyte interface under conditions of anodic polarization were analyzed. It was shown that dense chemisorption coatings are formed on the surface of III–V crystals at voltages of pore formation onset, and a degenerate inversion layer is formed on th…
Sepiolite is a hydrated magnesium silicate with a fibrous structure. It undergoes acid‐base interactions around the natural pH of 8.5. The zeta potential (zp) of sepiolite depends on the type, the chemical, and the mineralogical composition of sepiolite and more importantly the ionic environment of the suspensions. In…
The phenomenon of optical anisotropy in porous semiconductors and dielectrics (porous silicon, gallium phosphide, and alumina) and photonic crystal structures formed on their basis is reviewed. It is shown that anisotropic nanostructuring of initially isotropic media leads to the occurrence of strong birefringence. Ap…
Magnetostructural transformation and the associated magnetic entropy change were investigated in Ni-rich ferromagnetic Heusler alloys. A direct transformation from the ferromagnetic martensite phase to the paramagnetic austenite phase was observed in selected Ni54.8Mn20.3Ga24.9 and Ni55Mn18.9Ga26.1 two-alloy compositi…
The preparation and phase transitional properties of several optically active non‐symmetrical dimers are reported. Two types of dimeric mesogens formed by covalently combining pro‐mesogenic cholesterol with either phenyl 4‐cyanobenzoate (polar) or phenyl trans‐4‐pentylcyclohexanecarboxylate (apolar) cores in an end‐to…
The thermal degradation behavior of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (P(HB-co-HHx), HHx=12 mol%) has been studied under different environmental conditions by thermogravimetric analysis (TGA) Fourier transform infrared (FT-IR) spectroscopy. It is reported that at higher te…
Drop deformation in equiviscous polymer blends with dispersed phase volume fraction ranging from 0 to 10% has been investigated by video microscopy and image analysis in a parallel plate shear apparatus. Under steady external flow conditions the shape of individual drops, as measured by the three main axes, the orient…
A coupled mode space approach within the nonequilibrium Green's function formalism is presented, which allows performing simulations of realistic carbon nanotube field-effect transistors (CNT-FETs) with no spatial symmetry. Computing time is significantly reduced with respect to the real space approach, since only few…
Marine and freshwater diatoms show several important differences in silicon physiology. In addition to containing an order of magnitude more silica in their cell walls, freshwater diatoms also appear to have a less efficient silicic acid uptake mechanism. A novel set of silicon transporters (SITs), encoded by a small…
The permeance of carbon dioxide, oxygen, nitrogen, and air through commercial polymers based on polyethylene (PE), biaxially oriented polypropylene (BOPP), and polyamide (PA) used for food packaging is reported. The influence of temperature (from 10 to 60 ° C) and crease stress cycles (30, 50, 70, and 110) on gas perm…
We consider the effects of adding a PIB-PDMS diblock copolymer as a compatibilizer in model blends composed of polyisobutylene (PIB) and polydimethylsiloxane (PDMS). The ratio of PIB to PDMS was varied from 20:80 to 80:20 and, hence, these blends are dubbed “concentrated” blends. Most experiments were conducted on ble…
A newly developed Al-doped ZnO (AZO) thin-film magnetron-sputtering deposition technique that decreases resistivity, improves resistivity distribution, and produces high-rate depositions has been demonstrated by dc magnetron-sputtering depositions that incorporate rf power (dc+rf-MS), either with or without the introd…
Acid-base properties of zinc phthalocyanine (Pc) and zinc and metal-free tetrapyrazinoporphyrazine (TPPz) macrocycles with eight peripheral tert-butylsulfanyl or diethylamino substituents are investigated in this work by means of UV-vis spectroscopy. The Pc and TPPz are protonated on the azomethine nitrogens in acidic…
Abstract Complexes formed with synthetic clay minerals and dicationic and tetracationic porphyrins were prepared. The Soret bands of the multicationic porphyrins shifted to longer wavelength upon the formation of a complex with clay. The clay sheets themselves and the porphyrin molecules on the clay surface were exami…
The structures and stabilities of a set of carbon species on the Ni(111) surface, as well as the energy barriers of the initial stages of carbon growth, were computed by using density functional theory. It was found that the stability is on the order of graphitic monolayer > C in Ni bulk > carbon chain > small cluster…
Polymeric micelles are built from amphiphilic polymers through self-assembly effects. Due to their unique core shell structure, small size and modifiable surface, polymeric micelles have been widely investigated as nanoscale drug delivery carriers. Such systems may increase drug solubility and have possible applicatio…