Materials Literature
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A series of poly(butylene terephthalate)-poly(butylene succinate) (PBT-PBS) copolyesters were synthesized by the melt chain-extension reaction of dihydroxyl terminated PBT (HO-PBT-OH) and PBS (HO-PBS-OH) prepolymers using toluene-2,4-diisoyanate (TDI) as a chain extender. Transesterification between PBT and PBS during…
La(Co, Cu)O(3-δ) ceramics were prepared by pressureless sintering of citrate precursor powders, and their thermoelectric properties were investigated with an emphasis on the influence of Cu doping and phase structure as well as microstructure. It was found that a secondary phase first appeared in the form of a network…
IntroductionThe common goal in using liposomes for diagnostics and therapy is to deliver a pharmaceutic to the injured area. Liposomes are spherical, self-closed structures formed by one or several concentric lipid bilayers with an aqueous phase inside and between the lipid bilayers. Their ability to entrap different…
For electronic circular dichroism in the 4f-4f transitions (4f-4f CD) of a series of nine tetrakis ((+)-3-heptafluorobutyrylcamphorato) Ln(III) complexes, Δ-SAPR-8-C(4)(llll) Cs[Ln((+)-hfbc)(4)]·H(2)O (Cs-Ln = Cs-Pr, -Nd, -Sm, -Eu, -Dy, -Ho, -Er, -Tm, -Yb), the spectroscopic observables such as the dissymmetry factor…
Stimulus responsive surfactants based on dendritic glycerol azobenzene conjugates were used to solubilize and debundle single-walled carbon nanotubes in aqueous media. Their debundling property as well as their reaggregation behavior upon irradiation with light was examined and light triggered reversible bundling and…
We investigate the temperature and power dependence of the emission quantum yield of NaYF4:Er,Yb upconverters. We show that the quantum yields may vary by almost three orders of magnitude. We demonstrate that formation of the hexagonal phase of this material is not in itself sufficient to guarantee high upconversion e…
The new ball-type metallo bisphthalocyanines (Co(2)Pc(2) and Zn(2)Pc(2)) were synthesized from the corresponding [4,4'-bis(dicoumaroylphthalonitrile)] which can be obtained from the reaction of 3,3'-methylenebis(4-hydroxy-2H-chromen-2-one) and 4-nitrophthalonitrile. The structures of the newly synthesized compounds ha…
Poly(glycerol sebacate) (PGS) is a soft elastomer suitable for tissue engineering of soft types. However, the rapid degradation kinetics of this polyester has become one of the major drawbacks in the application of tissue engineering. In this work, a comparative study on in vitro enzymatic degradation of PGS- and poly…
Diamond is considered to be the most promising wide band gap semiconductor material for the fabrication of power switching devices with respect to the figure of merit. The authors have developed a high voltage and high current diamond Schottky barrier diode (SBD). This paper evaluates the static and dynamic electrical…
A hexanuclear gadolinium octahedral nanocage was self-assembled as an efficient multimeric magnetic resonance probe for selectively responding glucosamine. The rigid facial bridging ligands provided additional enhancements for the proton relativity around gadolinium ions, ensuring the application of MRI in vivo.
A light harvesting hydrogel, working in a wide range of temperature and pH, of a two component supramolecular complex of melamine and 6,7-dimethoxy-2,4[1H,3H]-quinazolinedione (donor) with riboflavin (acceptor) shows a gradual quenching and red shift of the acceptor emission peak with increase in its concentration thr…
In the present work we grow anodic TiO2 nanotube layers under defined hydrodynamic conditions using a rotating Ti anode. We show that hydrodynamic control can be beneficially used to achieve two main effects. First, under conditions where tube growth is controlled by diffusion (for low concentration of fluoride ions i…
X-Ray powder diffraction studies have been used to measure the thermal expansion properties of three zeolites with the LTA topology and provide details of the underlying structural changes. Siliceous ITQ-29 and dehydrated and hydrated silver zeolite A have large negative, moderate negative and positive thermal expansi…
Chitin is widely distributed in nature, being the main structural component of the exoskeleton of crustaceans and is non-toxic, biodegradable and biocompatible. These exoskeletons once discarded become an industrial waste creating environmental pollutant. In order to find an alternative use, the present work exploits…
High-quality nano-/microtextured NaTaO3 crystal layers were successfully fabricated on Ta substrates at a relatively low temperature using molten NaNO3 as the starting material. Ta substrates coated with an aqueous NaNO3 solution were heated at 500 °C in an infrared heating furnace, whereupon Ta reacted with NaNO3 (wh…
New Au(25) nanoclusters stabilized by heterotopic 4-aminothiophenolate ligands (HSPhNH(2)) have been isolated with a yield of ~70%. The nanoclusters formula determined by ESI-MS is Au(25)(SPhNH(2))(17), with the 18(th) position occupied by an amine or DMF molecules to close their electronic shell.
Thin films of germanium-doped zinc oxide have been deposited by atomic layer deposition. The zinc oxide matrix was grown from cyclic pulses of diethylzinc and water vapour over the temperature range of 100–350 °C substrate temperature. Tetramethoxygermanium(IV) was employed as a novel germanium-doping source, which co…
Two imine-linked polymer organic frameworks (POFs) with different geometries (C3v-POF and Th-POF) and mesoporous properties were prepared and proved to be catalyst supports. Due to the greater ability of Th-POF to coordinate metals, Cu- and Ir-coordinated Th-POFs were tested as catalysts. Both act as truly heterogeneo…
Peptidic hydrogels are an interesting class of materials, with potential applications in tissue engineering and controlled drug delivery. Fmoc–Phe3 self-assembling peptide was synthesized in an aqueous phase by using a lipase from Pseudomonas fluorescens. The bioconversion afforded a self-supporting hydrogel in only 1…
The preparation and characterization of three-dimensional hierarchical architectures, consisting of monolithic nanoporous gold or silver films formed on highly ordered 3D microporous carbon supports, are described. The formation of these nano/microporous structures involves the electrodeposition or sputtering of metal…