Search

Digital recording of the maxillomandibular relationship by using intraoral scanning in completely edentulous patients for computer-aided design and computer-aided manufacture implant-supported prostheses can be challenging. This clinical report describes the fabrication of complete arch, screw-retained implant-supported prostheses in a completely edentulous patient with a fully digital workflow. [ABSTRACT FROM AUTHOR]

M-type hexagonal ferrites were produced using the citrate auto-combustion technique. To understand the effects of substituting divalent Co2+ and rare earth elements Dy3+ on the structure, magnetic and removal efficiency of hexagonal ferrites, a series of samples including SrFe12O19, SrFe11.5Co0.5O19, Sr0.95Dy0.05Fe12O19, Sr0.95Dy0.05Fe11.5Co0.5O19 were analyzed. XRD analysis showed that all samples crystallized into a single M-type hexagonal phase. The small wavenumber absorption bands between 400 and 1000 cm−1 in FTIR curves are the primary features of M-type hexagonal ferrites. Magnetic properties varied with the addition or removal of Dy3+ and Co2+ doping due to the impact of spin canting with Dy3+ and Co2+ ions on strontium and iron ions. The study aimed to gather information about doping magnetic hexaferrites, which could be a pioneering development in wastewater treatment. The study examined the impact of substitution with rare earth and divalent elements in wastewater treatment, along with potential future developments in this field. The study examined various factors affecting the adsorption of lead ions from aqueous solutions, such as pH and contact time. The maximum removal efficiency of Sr0.95Dy0.05Fe11.5Co0.5O19 was approximately 99.6% at pH 7 and 25 °C after 60 min. The isotherm data fit into the Frendlish isotherm approach. The pseudo-first-order, pseudo-second-order, and intraparticle diffusion models clarified the adsorption kinetics. The capacity for adsorption of the studied samples was consistent and demonstrated through 4 cycles. [ABSTRACT FROM AUTHOR]

Nanomaterials, especially ferrites, have various applications in mechanical, electrical, and optical fields. However, their abilities in environmental applications remain unexplored. In this work, the flash auto-combustion method has been used to prepare three different compositions of CuFe2O4, Zn-CuFe2O4, and Co-CuFe2O4 nanocomposite. The structure, spectroscopic, surface, and morphological properties of the prepared samples were characterized using XRD, FTIR, BET, and HRTEM, respectively. According to XRD analysis, the prepared ferrites consist of nanocrystalline particles with sizes of 24.5, 37.5, and 32.6 for CuFe2O4, Zn-CuFe2O4, and Co-CuFe2O4, respectively. Zn-CuFe2O4 and Co-CuFe2O4 had a single cubic phase, while a tetragonal phase was formed in CuFe2O4. The addition of cobalt and zinc to copper ferrite increased the crystallite size and the lattice parameters. The absorption band in FTIR spectra, which represents the stretching vibrations along the [MetalO] bond at the octahedral (B) position, was nearly constant (412 Cm−1) by the addition of Zn to CuFe2O4. The surface area and quantity of gas adsorbed on the surface of Co-CuFe2O4 were the highest. The greatest force constants [(Ko = 1.37 & KT = 1.32 105 dyne/cm] were detected in Zn-CuFe2O4. Co-CuFe2O4 exhibited the highest saturation magnetization as well as magnetocrystalline anisotropy. From FESM, the particles have a homogeneous distribution, which is confirmed by the appropriate synthesis method. The nanonanosamples had an average particle size of 79 nm, 66 nm, and 56 nm for CuFe2O4, Co-CuFe2O4, and Zn-CuFe2O4, respectively. The surface area and quantity of gas adsorbed on the sample surface were increased by doping Cu ferrite with Co and Zn. All the prepared samples were tested for heavy metal (Cr6+) removal from the water; they demonstrated promising results after optimizing the experimental conditions at pH 7 and contact time 50 min, and these values reached 54%, 90%, and 93% for CuFe2O4, Zn-CuFe2O4, and Co-CuFe2O4 nanocomposite, respectively. [ABSTRACT FROM AUTHOR]

NiFe2O4 nanoparticles have been synthesized using the flash auto-combustion technique, while TiO2 nanoparticles were prepared via sol–gel method. NiFe2O4/TiO2 nanocomposite was obtained through the sonochemical method. Investigated samples have been studied through XRD, FTIR, and FESEM. The crystallite sizes of NiFe2O4, TiO2, and NiFe2O4/TiO2 are 48.37, 25.56, and 32.46 nm, respectively. FTIR analysis was used to look into the materials’ functional groups. The images of FESEM illustrated that the particles were prepared in nanoscale. All samples were good absorbers in the UV spectrum through the wavelengths of 200–350 nm. The energy band gap values of TiO2, NiFe2O4, and NiFe2O4/TiO2 nanocomposite are 3.4, 2.3, and 2.5 eV, respectively, for the indirect transition. The samples’ dielectric characteristics have been investigated and they have a semiconductor like behavior. VSM and the Faraday technique were used to test the materials’ magnetic characteristics. [ABSTRACT FROM AUTHOR]

Nanocomposites comprising (V2O5)x. (Mn0.4Fe2.6O4)(2−x), where x = [0.2, 0.4, 0.6, 0.8, and 1], were successfully synthesized by milling each single phase of V2O5 and Mn0.4Fe2.6O4 nanostructured samples. We studied the structure and morphology of the prepared samples through X-ray diffraction and scanning electron microscopy. UV–Vis. spectrum analysis was used to study the optical characteristics. As an attempt to improve the optical and nonlinear optical properties of the PVDF blend, the prepared nanocomposites were used as nanofillers for the poly (vinylidene fluoride) (PVDF) polymer. Optical and nonlinear optical properties of the PVDF polymer were tuned using (V2O5)x. (Mn0.4Fe2.6O4)(2−x), where x = [0.2, 0.4, 0.6, 0.8, and 1] nanocomposite. The obtained results showed a tunable spectrum, absorption, refractive index, and dielectric constant at wavelengths ranging from 200 to 800 nm. However, the results showed that the (V2O5)0.6. (Mn0.4Fe2.6O4)1.4, sample was the best for obtaining the lowest transmittance percentage and bandgap energy. The nonlinear optical properties and Kerr effect (quadratic electro-optic effect) showed a significant response, which can be tuned in the range from 200 to 1200 nm of wavelength using the investigated samples. Finally, incorporating (V2O5)x. (Mn0.4Fe2.6O4)(2−x), where x = [0.2, 0.4, 0.6, 0.8, and 1], nanoparticles in the PVDF polymer improved the hydrophilic behavior of the PVDF films. This study suggests a promising nanocomposite material for tunable optoelectronics and useful polymer membranes. [ABSTRACT FROM AUTHOR]