Materials Literature
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A number of practical application areas would benefit from the development of thin wideband antireflective (AR) surfaces. Here, we incorporate magnetic materials into AR gradings using two approaches. 1) We use the analytic approach demonstrated in a recent paper that details an optimal wideband AR design using a cont…
Tetrapodal ligands H4L(1) and H4L(2) containing imidazole groups have been synthesized by the reaction of 1,10-phenanthroline-5,6-dione with 1,2,4,5-tetrakis[(4-formylphenoxy)methyl]benzene and 1,2,4,5-tetrakis[(3-formylphenoxy)methyl]benzene, respectively, in presence of NH4OAc. Two star-shaped complexes [{Ru(bpy)2}4…
In this article, we put forward a novel strategy to realize the management of wave collapse through designing probe–pump configuration where probe wave is assumed to propagate in the positive-index region of metamaterials (MMs), while pump wave is assumed to propagate in the negative-index region. We disclose that cro…
This paper addresses the retarding effect on the crack growth on a welded tubular joint subjected to a severe loading, in an offshore wind turbine support structures in a harsh sea environment. The loading comprises periodic overload resulting to a retardation of the crack propagation. This effect is analysed by emplo…
In this paper we report the optical and gas sensing behaviours of tungsten oxide (WO 3 ) films, implanted with 45‐keV N 5 + ions of different fluences in the range 1 × 10 15 to 1 × 10 17 cm –2 . The film with fluence 1 × 10 15 cm –2 shows the most intense PL spectrum with two prominent peaks near UV and blue regions.…
Ammonium hexafluorotitanate and boric acid aqueous solutions were used as precursors for the growth of titanium oxide films on indium tin oxide (ITO)/glass substrate. For as-grown titanium oxide film used in an electrochromic device, Li + ions from electrolyte will be trapped to hydroxyl groups and degrade the electro…
We demonstrate the usage of the Lewis-acidic copper(II)hexafluoroacetylacetonate (Cu(hfac)2) and copper(II)trifluoroacetylacetonate (Cu(tfac)2) as low-cost p-dopants for conductivity enhancement of solution processable hole transport layers based on small molecules in organic light emitting diodes (OLEDs). The materia…
A new low-Z lithium fluoride-based optical stimulated luminescent (OSL) phosphor is developed. The phosphor shows good OSL properties, and its sensitivity is comparable with that of the commercial Al2O3:C (Landauer, Inc.) phosphor. For the luminescence averaged over initial 3 s, blue stimulated luminescence (BSL) and…
In this study, cellulose, a biodegradable polymer, was successfully aminated. For this purpose the cellulose was converted to a bromoacetylated derivative by reaction with bromoacetyl bromide. The resulting bromide derivative was then substituted with azido groups by reaction with sodium azide. Then the azido group wa…
This paper discusses the results of studies on the preparation of hydrogels with superabsorbent properties, prepared from high-amylose carboxymethylated corn starch, which was obtained by graft copolymerization, in an aqueous environment, of acrylamide and sodium acrylate mixture on to starch, using potassium persulfa…
Abstract The objective of present study was to evaluate the use of sucrose as a weighting agent in W/O/W emulsions. Placing sucrose in the internal water phase could increase the density of the oil droplet and provide natural weighing to the oil phase. A 60 wt% sucrose solution with or without gelatin served as inner…
Abstract Reaction of equimolar amounts of Cu(OAc)2·H2O and bis[4‐(3‐ethoxysalicylideneamino)phenyl]methane (H2L1) or bis[4‐(3‐ethoxysalicylideneamino)phenyl]sulfide (H2L2) in a 1:1 THF/MeOH mixture leads to the formation of structure‐analogous CuII helicates of the composition [{Cu2L2}(H2O)2}]·4H2O. The helicates form…
The introduction of a halide (Br, I) onto MgO leads to obtaining catalysts whose catalytic activity in transfer hydrogenation of acrolein with ethanol is significantly higher than that of unmodified MgO. In data found in literature, there is no concise view on how the modification of the surface of MgO with a halide a…
The complexation ability of photoreduction products of 2-(2,5-di-tert-butyl-3,4-dioxycyclohexa-1,5-dienyl)ethyl methacrylate in tetrahydrofuran (THF) solution and in its copolymer films with dimethacrylate and ethylene glycol monomethacrylate was studied. The product of photochemical reduction – catechol – reacts with…
The phase formation processes of isopolytungstates in the systems Co2+––H+–DMF–H2O (DMF-dimethylformamide) with different acidities (Z = ν(H+)/ν = 1.14–1.60) have been studied. It was found that only cobalt(II) hepta-, para-, and decatungstates could be isolated from aqueous DMF solutions. The chemical and FTIR spectr…
The two new fluorescent ligands RosCat1 and RosCat2 contain catechol receptors connected to rosamine platforms through an amide linkage and were synthesized by using microwave-assisted coupling reactions of carboxyl- or amine-substituted rosamines with the corresponding catechol units and subsequent deprotection. RosC…
Whereas the cluster [Mo3 S4 (acac)3 (py)3 ](+) ([1](+) , acac=acetylacetonate, py=pyridine) reacts with a variety of alkynes, the cluster [W3 S4 (acac)3 (py)3 ](+) ([2](+) ) remains unaffected under the same conditions. The reactions of cluster [1](+) show polyphasic kinetics, and in all cases clusters bearing a bridg…
An unusual 1D-to-3D transformation of a coordination polymer based on organic linkers containing highly polar push-pull π-conjugated side chains is reported. The coordination polymers are synthesized from zinc nitrate and an organic linker, namely, 2,5-bis{4-[1-(4-nitrophenyl)pyrrolidin-2-yl]butoxy}terephthalic acid,…
We propose and systematically justify a band structure for TbAs nanoparticles in GaAs and In0.53Ga0.47As host matrices. Fluence-dependent optical-pump terahertz-probe measurements suggest the TbAs nanoparticles have a band gap and provide information on the carrier dynamics, which are determined by the band alignment.…
Multi-band gap heterojunction solar cells fabricated from a blend of 1.2 eV and 1.4 eV PbS colloidal quantum dots (CQDs) show poor device performance due to non-radiative recombination. To overcome this, a CdS shell is epitaxially formed around the PbS core using cation exchange. From steady state and transient photol…