Dielectric, pyroelectric, and ferroelectric studies in (1 - )AgNbO-FeNbO lead-free ceramics.

In the present study, the effect of heterovalent Fe ions on the dielectric, pyroelectric, and ferroelectric properties of the (1 - )AgNbO-FeNbO ( = 0.005, 0.01, 0.

Enhanced energy storage performance in reaction-sintered AgNbO antiferroelectric ceramics.

In this research, AgNbO ceramics were produced by two sintering methods: reaction sintering (RS) and conventional solid-state sintering (CSSS). The process was similar for both methods, except that in RS, AgO and NbO precursors were mixed, then formed into pellets, skipping the calcination step, and sintered at 1100 °C for 6 hours. Both prepared ceramics had the same perovskite crystal structure with an orthorhombic crystal system and and 2 space groups with similar lattice dynamic vibration modes at room temperature.

Pillar[5]arene-Based Polycationic Glyco[2]rotaxanes Designed as Antibiofilm Agents.

(P.A.) is a human pathogen belonging to the top priorities for the discovery of new therapeutic solutions.

Dynamic Constitutional Frameworks as Antibacterial and Antibiofilm Agents.

Dynamic constitutional frameworks (DCFs) were synthesized and screened for biofilm inhibition or disruption. They are composed of a trialdehyde core reversibly linked to a diamine PEG connector and to a variety of neutral, anionic, or cationic heads, to generate a library of DCFs to generate multivalent dendritic architectures in the presence of Pseudomonas aeruginosa and Staphylococcus aureus. The best DCFs were always polycationic and the nature of the cationic heads significantly impact the antibiofilm activity.

Cationic dynamic covalent polymers for gene transfection.

Dynamic covalent polymers are materials formed by reversible covalent bonds and non-covalent interactions through an adaptive constitutional dynamic chemistry. The implementation of dynamic covalent polymers in gene delivery has recently emerged due to their responsive and adaptive features. Indeed, such an approach offers the alluring promise of discovering optimal delivery vectors self-fitted to their nucleic acid cargos and responsive to environmental changes (e.

Microwave-Assisted Synthesis of an Alternant Poly(fluorene-oxadiazole). Synthesis, Properties, and White Light-Emitting Devices.

An alternant poly(dihexyl fluorene-co diphenyl oxadiazole) has been synthetized by microwave-assisted oxidative polymerization. The structure has been confirmed by H-NMR and FTIR spectroscopies. Gel permeation chromatography indicated high molecular weight and low polydispersity index.

Piezoresistive Effect in the [Fe(Htrz)(trz)](BF) Spin Crossover Complex.

We report on the effect of hydrostatic pressure on the electrical conductivity and dielectric permittivity of the [Fe(Htrz)(trz)](BF) (Htrz = 1H-1,2,4,-triazole) spin crossover complex. Variable-temperature and -pressure broad-band impedance spectrometry revealed a piezoresistive effect of more than 1 order of magnitude for pressures as low as 500 bar, associated with a large pressure-induced hysteresis of 1700 bar. The origin of the piezoresistive effect has been attributed to the pressure-induced spin state switching in the complex, and the associated P,T phase diagram was determined.