Materials Literature
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A complex of cobalt(II)(OCN)(2) coordinated with four pyridines having a stable tert-butyl aminoxyl exhibited in frozen MTHF a slow magnetic relaxation for the reorientation of magnetization with activation barrier, Delta/k(B) = 50 K, and a hysteresis loop having a fast relaxation at 0 Oe below 2.5 K.
Electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion resistance of the chromate conversion coating (CCC) formed on two different substrates, namely bare and clad 2024 aluminum alloys, and after different surface preparation procedures, namely acid pickling with or without desmutting. The…
Gallium(III) corroles are closed-shell analogs of zinc(II) porphyrins. These intensely fluorescent molecules can be modified readily to tune their solubility and photophysical properties. A water-soluble gallium corrole has been synthesized and investigated in depth; it binds tightly to human serum albumin, opening th…
The mesogenic and optical properties of few families of nematic liquid crystals with low, medium and high birefringence as well as high tilted chiral anticlinic(antiferroelectric)smectics recently developed have been shortly characterized and reviewed. They are:alkyl 4-trans-(4-trans-alkylcyclohexyl)cyclohexyl carbona…
Hydrogen can be effectively and selectively produced from the partial oxidation of methanol over Ag/CeO(2)-ZnO catalyst at low temperatures (T(r) < 200 degree C).
We report on a method for high speed, large stroke phase modulation using dual frequency control of liquid crystals. Our system uses an all-electronic feedback system in order to simplify the control. We show half wave phase modulations of ~120Hz with the operating point varying over nearly the full dynamic range of t…
The structural, morphological and chemical–physical characterization of films constituted of self-assembled non-helical region free type I collagen molecules has been investigated. The results indicate the presence of information at the molecular level which allow collagen I molecules to self-assemble. In the fiber fo…
A gelatin/hyaluronic acid (GH) sponge has been fabricated by freeze-drying and cross-linking. The GH sponge was insoluble when cross-linked with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide. The morphologies of sponges were investigated using a field emission scanning electron microscope. The porosity of the GH spon…
We present the facile preparation and characterization of the first “unwrapped” hexa-peri-hexabenzocoronene derivative, which forms a stable columnar liquid crystalline mesophase with a practically accessible isotropization temperature.
Using Ti-50Ta, Ti-50Ta-Sn and Ti-50Ta-Zr alloys, the effects of Sn and Zr additions on phase constitution in the solution treated and quenched state and aging behavior were studied by electrical resistivity and Vickers hardness measurements and X-ray diffactometry. All alloys were solution treated at 1173 K for 3.6 ks…
Two columnar phases forming 2,4,6-triarylamino-1,3,5-triazines have been investigated in binary mixtures with calamitic and non-liquid crystalline benzoic acids carrying one or two alkoxy chains at the aromatic core. The triazines form hydrogen bonded aggregates with the complementary acids. Each investigated equimola…
For the first time the photooptic effect in induced cholesteric mixtures using photosensitive nematic host has been observed. The changes of the pitch (color) and optical anisotropy (Δn) and also cholesteric-isotropic phase transition have been studied. Potential applications of these systems are color filters, UV ima…
In this work, we have re-examined the photomagnetic properties of a series of binuclear iron(II) complexes of formula [{Fe(L)(NCX)2}2bpym], where L is bpym = 2,2′-bipyrimidine and bt = 2,2′-bithiazoline and X = S, Se, by light irradiation at 647.1–676.4 nm and at 830 nm and we confirm that after optical excitation the…
New chromogenic properties of a spirooxazine {1,3,3-trimethylspiro(indoline-2,3′-[3H]naphtho[2,1-b][1,4]oxazine), SO} are presented in this work. This molecule was found to be photochromic and piezochromic in the pure microcrystalline solid phase and also exhibited acidichromism when kept in contact with a hydrogen-do…
Anodizing of Ta-Al bilayers (aluminum deposited on tantalum) was performed in 0.2 M H 2 C 2 O 4 solution to transform the aluminum metal into its nanoporous oxide followed by pore widening and reanodizing to different voltages in the range of 100-600 V. The anodic films consist of an upper layer of nano-sized tantala…
Crystal melting of shape memory polyurethane (SMPU) film is investigated using polarizing optical microscopy, scanning electron microscopy, differential scanning calorimetry, and temperature variable wide-angle x-ray diffractometry. Water vapor permeability (wvp) at different temperatures is measured. The results show…
The design and fabrication of thin films based on bioresorbable polymers such as poly(epsilon-caprolactone) (PCL) has been the focus of a part of current biomedical research, especially as matrices for membrane tissue engineering. We have successfully developed perforated microthin PCL membrane for this purpose. Two c…
Solid-state electrochromic devices(ECDs)are of considerable technological and commercial interest because of their controllable transmission, absorption, and/or reflectance. For instance, a major application of these devices is in smart windows that can regulate the solar gains of buildings and also in glare attenuati…
fine particles with high photoluminescence were prepared by a spray pyrolysis process. The emission intensity of particles under vacuum ultraviolet (VUV) excitation was optimized by controlling the Tb content, excess quantity of boron, and heat-treatment temperature. The highest luminescent intensity under VUV excitat…
In tissue engineering, excellent biodegradable materials are desired as temporary scaffolds to support cell growth and disappear with the progress of tissue regeneration. We previously synthesized biodegradable poly(depsipeptide-co-lactide), poly[(Glc-Asp)-co-LA] and poly[(Glc-Lys)-co-LA], having reactive side-chain g…