Investigation of the structure and dielectric properties of doped barium titanates.

This work examined the influence of zirconium concentration on barium titanate (BZT) BaZrTiO, with ( = 0, 0.15, 0.50, 0.

Microstructure and high frequency electromagnetic parameters of the soft/soft (CoFeO) : (NiCuZnFeO) nanocomposites.

The soft/soft (CoFeO)  : (NiCuZnFeO) (CFO /NCZO ) nanocomposites (NCs) based on spinel ferrites were produced by the sol-gel method with varying phase's ratio ( :  = 0 : 1; 1 : 1; 2 : 1; 3 : 1; 1 : 3; 1 : 2 and 1 : 0). All NCs consisted of 2 single phases (initial spinels) without any impurities and the absence of chemical interaction between phases. Structural features were investigated and analyzed.

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites.

Nanocomposite films based on spinel ferrite (MgZnFeAlO) in a PVA matrix were obtained. An increase in the spinel concentration to 10 wt.% caused an avalanche-like rise in roughness due to the formation of nanoparticle agglomerates.

Structure, Morphology and Electrical/Magnetic Properties of Ni-Mg Nano-Ferrites from a New Perspective.

Using the auto combustion flash method, Ni1-x+2Mgx+2Fe2+3O4 (x = 0, 0.2, 0.6, 0.

Impact of the Nanocarbon on Magnetic and Electrodynamic Properties of the Ferrite/Polymer Composites.

Binary and ternary composites (CM) based on M-type hexaferrite (HF), polymer matrix (PVDF) and carbon nanomaterials (quasi-one-dimensional carbon nanotubes-CNT and quasi-two-dimensional carbon nanoflakes-CNF) were prepared and investigated for establishing the impact of the different nanosized carbon on magnetic and electrodynamic properties. The ratio between HF and PVDF in HF + PVDF composite was fixed (85 wt% HF and 15 wt% PVDF). The concentration of CNT and CNF in CM was fixed (5 wt% from total HF + PVDF weight).

Investigation of AC-Measurements of Epoxy/Ferrite Composites.

A pure ferrite and epoxy samples as well as the epoxy/ferrite composites with different 20 wt.%, 30 wt.%, 40 wt.

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties.

The paper describes preparation features of functional composites based on ferrites, such as "Ba(FeGa)O/epoxy," and the results of studying their systems; namely, the correlation between structure, magnetic properties and electromagnetic absorption characteristics. We demonstrated the strong mutual influence of the chemical compositions of magnetic fillers (Ba(FeGa)O 0.01 < < 0.

Correlation Between Composition and Electrodynamics Properties in Nanocomposites Based on Hard/Soft Ferrimagnetics with Strong Exchange Coupling.

In this work, SrBaPbFeO/(CuFe₂O₄) (x = 2, 3, 4, and 5) as strongly exchange-coupled nanosized ferrites were fabricated using a one-pot sol⁻gel combustion method (citrate sol-gel method). The X-ray diffraction (XRD) powder patterns of the products confirmed the occurrence of pure, exchange-coupled ferrites. Frequency dependencies of the microwave characteristics (MW) were investigated using a co-axial method.

Investigation into the structural features and microwave absorption of doped barium hexaferrites.

BaFeGaO (x ≤ 1.2) hexaferrites were synthesized via the usual ceramic technology. It has been established that with an increase in x, the unit cell and magnetic parameters monotonically decrease.

Recognition and selective binding of DNA by ionenes of different charge density.

The ability of aliphatic ionenes to recognize and bind DNA or poly(methacrylic acid) (PMA) in the equimolar mixture of these polyanions was studied by fluorescence quenching technique. Within a particular system, the selectivity of competitive interactions was shown to be determined by a component with the lowest degree of polymerization (DP). Ionene polycations with lowest DP values did not exhibit pronounced selectivity in binding DNA or PMA with higher values of DP.

Competitive reactions in solutions of poly-L-histidine, calf thymus DNA, and synthetic polyanions: determining the binding constants of polyelectrolytes.

The physicochemical characteristics of a nonviral gene delivery system will govern its functional bioactivity; however, empiricism dominates the literature in this field, and a significant deficiency of quantitative investigation and evaluation of nonviral gene delivery vehicles remains. Herein, we derive a physical model and experimental method to quantitatively determine the binding constants between a model polycationic nonviral gene delivery vehicle poly-L-histidine (PLH) and calf thymus DNA. The approach has utility to a variety of systems and is not limited to the described polymer model.