“Ferrites”: Synthesis, Structure, Properties and Applications

Ferrites synthesis method and characterization techniques are attracting huge attentions of researchers because of their wide scope of uses in numerous areas. The ferrites include high resistivity, saturation magnetization, permeability, coercivity and low power losses. The above-mentioned useful ferrites characteristics make them appropriate for use in different applications. These ferrites are used in biomedical field for cancer cure and MRI. Electronic applications are transformers, transducers, and inductors which are also made using ferrites and also used in making magnetic fluids, sensors, and biosensors. Ferrite is a profoundly helpful material for many electrical and electronic applications. It has applications in pretty much every domestic device like LED bulb, mobile charger, TV, microwave, fridge, PC, printer, etc. This review mainly focus on the synthesis method, characterization techniques, and implementation of FNPs. This Chapter presents various methods used for ferrites preparation with distinctive examples, their advantages as well as limitations in detail. Ferrites properties like structural, optical, electrical and magnetic with their characterization techniques and various applications in the areas of biomedical, electronics, and environment are also discussed.

In-Situ Depth Measurement of Laser Micromachining

Precision laser micromachining plays an important role in the biomedical, electronics, and material processing industries. During laser drilling, precision depth detection with micrometer-level resolution is required, particularly with blind-hole or heterogeneous structures. We present an optical detection system utilizing an optical confocal structure, experimentally confirmed to achieve a >95% accuracy for micron-diameter holes that are tens-of-microns deep. This system can be easily integrated into commercial laser micromachining processes, and can be employed in laser drilling and three-dimensional active-feedback laser printing.

Expansion of the genotypic variability in watermelon by physical mutagenesis

Purpose. Studies have been conducted on 18 promising watermelon genotypes to expand the genotypic variability of watermelon by induced mutagenesis. Materials and methods. Air-dried seeds were irradiated with a closed 60Co γ-source «Doslidnyk» (Department of Molecular and Medical Biophysics, Faculty of Radiophysics, Biomedical Electronics and Computer Systems, V.N. Karazin Kharkiv National University of MES of Ukraine). Results and discussion. Each of the most informative breeding traits was statistically analyzed for their expression patterns and levels by variants of mutagenic treatment (different doses - 150 Gy, 200 Gy, and 250 Gy) in each of the 18 genotypes. The patterns of influence of the irradiation doses on plant growth and development have been determined, both in individual genotypes and for the whole sample. It has been found that γ-irradiation had a depressing effect in the majority of genotypes (late maturation, long or short stems, altered order of the 1st female flower formation, extended phases of the growing period). Genotypes and their groups (clusters), in which expression of traits is opposite (alternative), have been identified. Sources of economically valuable traits have been identified, and the following effective doses of γ-irradiation have been established for genotypes (clusters): 4 genotypes of cluster 4 γ-irradiated at 250 Gy ‑ in breeding for yield capacity; 2 genotypes of cluster 3 γ-irradiated at 150 ‑ 250 Gy – in breeding for marketability; 3 genotypes of clusters 3 γ-irradiated at 150, 200 or 250 Gy – in breeding for large fruits: 1 genotype of cluster 5 γ-irradiated at 150, 200 or 250 Gy – in breeding for late maturation; 2 genotypes of cluster 3 γ-irradiated at 200 or 250 Gy and 5 genotypes of cluster 5 γ-irradiated at 150 or 200 Gy– in breeding for early maturation; 3 genotypes of cluster 3 γ-irradiated at 200 or 250 Gy and 7 genotypes of cluster 5 γ-irradiated at 150, 200 and especially 250 Gy – in breeding for long stems; and 1 genotype of cluster 1 γ-irradiated at 150, 200 or 250 Gy – in breeding for short stems

Inorganic Thermoelectric Fibers: A Review of Materials, Fabrication Methods, and Applications

Thermoelectric technology can directly harvest the waste heat into electricity, which is a promising field of green and sustainable energy. In this aspect, flexible thermoelectrics (FTE) such as wearable fabrics, smart biosensing, and biomedical electronics offer a variety of applications. Since the nanofibers are one of the important constructions of FTE, inorganic thermoelectric fibers are focused on here due to their excellent thermoelectric performance and acceptable flexibility. Additionally, measurement and microstructure characterizations for various thermoelectric fibers (Bi-Sb-Te, Ag2Te, PbTe, SnSe and NaCo2O4) made by different fabrication methods, such as electrospinning, two-step anodization process, solution-phase deposition method, focused ion beam, and self-heated 3ω method, are detailed. This review further illustrates that some techniques, such as thermal drawing method, result in high performance of fiber-based thermoelectric properties, which can emerge in wearable devices and smart electronics in the near future.

Recent Progress on Energy Harvesters for Biomedical Applications

Energy harvesting devices have emerged as a promising technology to not only meet global energy demands but also power biomedical electronics. The dramatic advancement in self-powered biomedical electronics used for monitoring and treatment of severe diseases is part of a paradigm shift that is on the horizon. The review paper highlights recent progress on energy harvesters for scavenging energy to realize self-powered systems. The emphasis is mainly on piezoelectric and triboelectric nanogenerators addressing the basic operating principle, electrical model, design techniques, newly developed materials and their performance as well as associated typical applications. Herein, piezoelectric devices have been compared on basis of their materials, energy conversion efficiency, piezoelectric coefficient and power harvesting circuit. In addition, the recent advances of hybrid nanogenerators in terms of its biomedical applications are also highlighted. Finally, the conclusions and future prospects towards self-powered systems for implantable and wearable medical electronic devices are discussed for effective health monitoring, bio-sensing and clinical therapy.

Influence of Reinforcement Oxides on Structural and Mechanical Properties of Glass-Ceramics: A Review Article

This review studied the mechanical behaviors of Glass ceramics (GC) based on the Al2O3 /SiO2 system. Glass ceramics are great interest due to their wide variety of applications, which have the ability to fulfil the recent demands of advanced mechanical, optical and biomedical applications. Glass-ceramics are typically heat-stable and have greater mechanical features than glasses. In addition, mechanical properties can be customized to provide variable volume fractions of crystalline phases by regulating nucleation and growth of the crystalline phases. The distribution of these crystalline phases in the glass matrix increases the consistency of the material and, in comparison, effectively limits the growth of cracks. The crystallization process resulted in substantial improvements in micro-hardness and density values such as sodium calcium phosphate (Na4Ca(PO3 )6 and calcium pyrophosphate (βCa2P2O7 ) had sufficient properties for bone grafts and dental applications. This article outlines recent developments in the field of doping Oxides as reinforced with SiO2 -Al2O3 -based Glassceramics, to enhance the mechanical properties of Glassceramics combination. The research focused on the mechanical and the tribological behaviour of Biomedical, Electronics applications and selection of fabrication methods