Polarization-dependent conductivity of grain boundaries in BiFeO3 thin films

This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, FCT Ref. UID/CTM/50011/2019, financed by national funds through the FCT/MCTES. The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. For the financial support, we also express our gratitude to the Brazilian agencies: FAPESP (Project N° 2017/13769-1) and CNPq (Research Grant 304604/2015-1 and Project N° 400677/2014-8). This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No 778070

New μs isomers in Tz=1 nuclei produced in the 112Sn(63A MeV)+natNi reaction

Expérience GANIL, équipement SISSI/LISE

DOMAIN STRUCTURE IN POLYCRYSTALLINE BiFeO3 THIN FILMS: COLLECTIVE POLARIZATION AND TRANSPORT PHENOMENA

The relation between the piezoelectric response, polarization and conductivity polycrys-talline BiFeO3 films is investigated. Polarization-dependent conductivity of the GBs was ob-served. Domain structure and piezoelectric response in thin film BFO was demonstrated to be dependent on grain size.The research was made possible by Russian Science Foundation (Grant 19-72-10076). The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used

Wormlike micelles in mixed amino acid surfactant/nonionic surfactant aqueous systems and the effect of added electrolytes

12 pages, 11 figures, 1 scheme.-- PMID: 19367080 [PubMed].The formation of viscoelastic wormlike micelles in mixed amino acid surfactant/nonionic surfactant aqueous systems in the presence of different counterions and salts is reported, and the effects of the different electrolytes on the rheological behavior are discussed. N-dodecanoylglutamic acid (LAD) is neutralized with biologically relevant L-lysine and L-arginine to obtain anionic surfactants (LAD-Lys2, LAD-Arg2) which form aqueous micellar solutions at 25 degrees C. Addition of a nonionic surfactant, tri-ethyleneglycol mono n-tetradecyl ether (C14EO3), to the aqueous solutions of both LAD-Lys2 and LAD-Arg2 causes the zero-shear viscosity (eta(0)) to increase with C14EO3 concentration gradually at first, and then sharply, indicating one-dimensional growth of the aggregates and eventual formation of entangled wormlike micelles. Further addition of C14EO3 ultimately leads to phase separation of liquid crystals. Such a phase separation, which limits the maximum attainable viscosity, takes place at lower C14EO3 concentrations for LAD-Lys2 compared to LAD-Arg2 systems. It was found that the rheological behavior of micellar solutions is significantly affected by the addition of Na+X(-) salts (X = Cl(-), Br(-), I(-), NO3(-)). The maximum viscosities obtained for the systems with added salt are all higher than that of the salt-free system, and the onset of wormlike micelle formation shift towards lower nonionic surfactant concentrations upon addition of electrolyte. The maximum attainable thickening effect of anions increases in the order NO3(-)>I(-)>Br(-)>Cl(-). The effect of temperature was also investigated. Phase separation takes place at certain temperature, which depends on the type of anion in the added salt, and decreases in the order I(-)>NO3(-)>Br(-) approximately equal Cl(-), in agreement with Hofmeister's series in terms of amphiphile solubility. The thermoresponsive rheological behavior was also found to be highly dependent on the type of anion, and anomalous trends, i.e. viscosity increase with temperature, were observed for all anions except Br(-).KA is thankfui to Ministry of Education, Culture, Sports, Science and Technology, Grant-in-Aid for Young Scientists (Bj, No. 18780094 and partly supported by Core Research for Evolution Science and Technology (CREST) of JST Corporation.Peer reviewe