We report that a layered iron-based compound LaOFeAs undergoes superconducting transition under doping with F- ions at the O2- site. The temperature (Tc) exhibits trapezoid shape dependence on content, highest Tc of ∼26 K ∼11 atom %.

A layered oxyphosphide, LaNiOP, was synthesized by solid-state reactions. This crystal confirmed to have a structure composed of an alternating stack (La(3+)O(2-))(+) and (Ni(2+)P(3-))(-). We found that the resulting LaNiOP shows superconducting transition at approximately 3 K. material exhibited metallic conduction Pauli paramagnetism in temperature range 4-300 The resistivity sharply dropped zero magnetic susceptibility became negative <4 K, indicating occurs. volume fraction phase...

We propose a recycling strategy for tough polymers based on microparticles. The "microparticle-based" concept allows materials without loss of their properties (‘closed-loop’ recycling).

The deformation of soft hydrogel microspheres (microgels) adsorbed at the air/water interface was investigated for first time using large poly(<italic>N</italic>-isopropyl acrylamide)-based microgels synthesized by a modified aqueous precipitation polymerization method.

The first-, second-, and third-generation dendrimer-like branched poly(methyl methacrylate)s (PMMA)s were synthesized by an iterative divergent approach which involves a coupling reaction of α-functionalized living anionic PMMA with chain-end-functionalized benzyl bromide moieties transformation the tert-butyldimethylsilyloxymethylpheny groups into functionalities. sequence could be repeated three times without problem to afford series generations PMMAs well-defined architectures precisely...

The synthesis of dendrimer-like star-branched poly(methyl methacrylate)s (PMMAs) were carried out by an iterative divergent approach which involved a coupling reaction α-functionalized living PMMA with two tert-butyldimethylsilyloxymethylphenyl (SMP) groups benzyl bromide (BnBr) chain-end-functionalized and transformation the introduced SMP into BnBr functionalities. PMMAs up to seventh generation have been successfully synthesized repeating these reactions seven times. resulting polymers...

Abstract Dendrimer‐like star‐branched polymers recently developed as a new class of hyperbranched polymers, which resemble well‐known dendrimers in branched architecture, but comprise polymer chains between junctions, are reviewed this highlight article. In particular, we focus on the precise synthesis various dendrimer‐like and block copolymers by methodology based iterative divergent approach using living anionic 1,1‐bis(3‐ tert ‐butyldimethylsilyloxymethylphenyl)ethylene. © 2006 Wiley...

We investigated the rheology of a series anionically synthesized, model symmetric Cayley tree poly(methylmethacrylates) having from 1 to 4 generations identical molar mass. The hierarchical relaxation different was assessed linear data by accounting for both plateau modulus and characteristic times. Using tube-model time-marching analysis based on concept hierarchy motion, we described quantitatively frequency spectra without adjustable parameters. also performed uniaxial extensional...

A series of the fourth-generation (4G) dendrimer-like star-branched poly(methyl methacrylate)s, (PMMA)s, with high branch densities have been synthesized by iterative "arm-first" divergent methodology. It involves a two-reaction sequence in each process: (1) linking reaction α-functionalized living anionic PMMA either two or four tert-butyldimethylsilyloxymethylphenyl (SMP) groups benzyl bromide (BnBr)-chain-end-functionalized and (2) transformation SMP into BnBr functions. Accordingly,...

Hydrophobized nanocomposite microgels can serve as particulate emulsifiers for water-in-oil (W/O) emulsions with different types of oils, including non-polar which usually do not form W/O conventional microgels.

Although thin elastomer films of polymer nanoparticles are regarded as environmentally friendly materials, the low mechanical strength limits their use in various applications. In present study, we investigated fracture resistance latex composed acrylic where a small quantity rotaxane crosslinker was introduced. contrast to conventional nanoparticle-based elastomers, rotaxane-crosslinked exhibited unusual crack propagation behavior; direction changed from parallel one perpendicular crack,...

The comonomer-unit compositional distributions have been investigated for bacterial poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)] samples with 3HH unit content of 13.8, 18.0, 22.0, and 54.0 mol %. They were comonomer compositionally fractionated using chloroform/n-heptane mixed solvent at ambient temperature. fractionation P(3HB-co-18.0 %3HH) P(3HB-co-22.0 % 3HH), which could not be carried out effectively room temperature, refractionated 70 degrees C in the solvent....

Electronic and magnetic properties of a layered compound LaMnPO are examined in relation to newly discovered iso-structural superconductor LaFeAs(P)O. Neutron diffraction measurements, together with temperature dependent susceptibility, clarify that is an antiferromagnet at least up 375 K. The spin moment Mn ion determined be 2.26 μB room temperature, the configuration antiparallel Mn–P plane parallel between planes, which rather different from LaFeAsO. Optical absorption spectra,...

Abstract Using H 2 SO 4 metal sulfate complex catalysts, in non‐polar solvents isotactic polyvinyl isobutyl ether was obtained at room temperature. Al, Mg, and Cr sulfates were used as sulfates. These polymers had a higher regularity than that of which polymerized by BF 3 · Et O −78°C. In the polymerization these stereoregularity resultant polymer did not change or rather increased slightly with raise

The emission intensity of a GaInAsP photonic crystal nanolaser is affected by the pH solution, in which immersed. This phenomenon can be explained change redox potential, modifies filling electrons at surface states semiconductor and hence nonradiative recombination. allows to simultaneously independently detect refractive index electric charges near on basis variation wavelength intensity, respectively. paper demonstrates this function through alternate deposition charged polyelectrolytes...

We report on the synthesis of large and densely tough dendrimer-like star-branched polystyrenes generation 3, specially designed for their visualization by AFM imaging. For this purpose, an iterative methodology involving a sequential three stages synthetic approach has been adopted. The precisely G-3 polymers appear images as completely flattened objects with symmetrical square-like shape average diameter 250 nm height less than 1 nm. Imaging internal structure indicates that they are...

In general, biochemical sensors based on photonic cavities are used to detect changes in the refractive index of environment. this study, however, a GaInAsP semiconductor photonic-crystal nanolaser sensor that we recently developed was found not only environmental but also surface charge. contrast pH sensitivity reported previously, is an ultra-sensitive detection mechanism capable identifying proteins and deoxyribonucleic acids (DNA) at femtomolar-order or lower concentrations. When device...

The three-dimensional structure of nanocomposite microgels was precisely determined by cryo-electron micrography. Several that differ with respect to their structure, which were obtained from seeded emulsion polymerization in the presence microgels, used as model materials for segmentation images these provide important insights into interactions between hydrophobic monomers and is, styrene recognize molecular-scale differences polarity within during polymerization. This result led formation...

The comonomer composition and its distribution have been investigated for poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) [P(3HB-co-3HH)], which was bacterially synthesized by Ralstonia eutropha from coconut oil as a carbon source. Using chloroform/heptane mixed solvent, they were fractionated into several fractions with different composition. Bacterially P(3HB-co-3HH)s found to wide compositional distribution. the narrower distribution, dependence of thermal properties investigated....

A series of well-defined dendrimer-like star-branched polystyrenes (PS)s has been synthesized by developing a new iterative methodology based on "arm-first" divergent approach. In the methodology, following three reaction steps are needed for entire synthetic sequence: (1) linking α-3-(tert-butyldimethylsilyloxy)propyl- (TBDMSOP-) functionalized polystyryllithium end-capped with 1,1-diphenylethylene either core compound four benzyl bromide (BnBr) functions or chain-end−BnBr-functionalized...

Composite microgels with polystyrene nanoparticles were synthesized by seeded emulsion polymerization of styrene in the presence pH- and temperature-responsive poly(N-isopropylacrylamide-co-methacrylic acid) as seeds. In particular, core maintained their swelled state pH was increased to 10 during conducted at an elevated temperature. Furthermore, we tuned swelling degree changing amount methacrylic acid incorporated synthesis microgels. Unlike deswollen microgels, polymerization, swollen...

A series of raspberry-shaped composite microgels were synthesized by seeded emulsion polymerization styrene in the presence hydrogel particles with different distributions charged groups. Unlike whose groups are localized their center,29 polystyrene nanoparticles formed inside core when on surface used as cores for polymerization. The effects charge densities and concentration monomer during resultant structures investigated. obtained mainly evaluated electron microscopy, stimuli...