Materials Literature
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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…
Polymer nanocapsules were synthesized using core/shell nanospheres composed of an identical polymer. Linear polypyrrole (PPy)/crosslinked PPy core/shell nanospheres were synthesized stepwise by microemulsion polymerization using two oxidants with different chemical oxidation potentials, i.e. copper(II) chloride and ir…
Variable temperature synchrotron powder diffraction methods have been used to study the structures and phase transitions in a series of perovskites of composition Sr1−xBaxHfO3. We find that increasing the Ba content results in a transition from the orthorhombic Pnma type structure to the cubic Pmmvia two intermediate…
Novel luminescent materials based on lanthanides [Eu(III), Tb(III), Sm(III), and Dy(III)] and a mixed zirconium phenyl- and m-sulfophenyl phosphonate as the host matrix, have been prepared and photophysically characterized. Powder X-ray diffraction, 31P-MAS-NMR spectroscopy, IR spectroscopy, and diffuse-reflectance UV…
Successful photo-orientation of mesostructured surfactant/silica hybrids is performed via hierarchically relayed multiple transfers among hetero-interfaces. A Langmuir–Blodgett monolayer of the azobenzene-containing polymer was first optically oriented via irradiation with linearly polarized light, and the photoinduce…
We report the syntheses of cobalt N-confused porphyrins; this work completes the series of the late first-row transition metals that have been incorporated into the core of N-confused porphyrin, and in these compounds the macrocycles can act as either a -2 or -3 anion.
The reversible trans ↔ cis photoisomerization of azobenzene-based self-assembled monolayers on ultrathin platinum films has been monitored for the first time by UV-Vis transmission spectroscopy with a conventional spectrophotometer.
A new approach to the synthesis and the organization of Mn3O4 (hausmannite) nanoparticles has been developed using the thermolysis of the magnetic cluster [Mn12O12(C2H5COO)16(H2O)3] linked to a SBA-15 mesoporous silica functionalized with –COOH groups. The obtained composites were studied by X-Ray diffraction (XRD), i…
Swelled plastics in supercritical carbon dioxide provide unique environments for stabilizing palladium and rhodium nanoparticles and for catalytic hydrogenation. Complete hydrogenation of benzene to cyclohexane can be achieved in 10 minutes using the plastic stabilized Rh nanoparticles at 50 degrees C in supercritical…
Unsymmetrical dibenzophenazine discotic mesogens were prepared via the corresponding tetraalkoxybenzil derivatives. These dibenzophenazines exhibit Colho phases over extremely broad temperature ranges.
Organic surfaces of specific chemistry can be fabricated using plasma polymerisation. A recently developed deposition approach allows gradients in surface carboxyl group concentration to be fabricated over a distance of 13 mm from a mixed acrylic acid/octadiene plasma. The utility of these surfaces in the investigatio…
Desosamine is a 3-(dimethylamino)-3,4,6-trideoxyhexose found in some macrolide antibiotics. In Streptomyces venezuelae, there are seven genes required for the biosynthesis of this unusual sugar. One of the genes, desIV, codes for a dTDP-glucose 4,6-dehydratase, which is referred to as DesIV. The reaction mechanisms fo…
Passive films formed on Fe-18Cr alloy in a borate buffer solution were studied using impedance spectroscopy and photoelectrochemical response. The passive film was composed of an inner oxide and covering hydroxide layer. Both layers exhibited n-type semiconductor properties with an optical bandgap energy, E g , of 3.4…