Synthesizing magnetic nanoparticles?5 answersMagnetic nanoparticles can be synthesized using various methods such as top-down and bottom-up approaches. The choice of synthesis route is important as it affects the size, shape, and distribution of the particles, which in turn impact their magnetic properties and performance. One commonly used method is the chemical coprecipitation method, which is simple, low-cost, and easily controlled. Another method is pulsed-laser induced photolysis, which relies on hydrogen peroxide to generate a hydrolysis reaction and has been successful in synthesizing magnetic Fe3O4 nanoparticles. Chemical synthesis is a common approach for creating well-controlled and reproducible magnetic nanoparticles, with emphasis on surface functionalization for biotechnological applications. Various methods have been developed for the synthesis of magnetic nanoparticles, each with its own advantages and disadvantages, and physicochemical characterization techniques are used to determine their properties.
What are the properties of ferromagnetism in Cr-based monolayers?5 answersFerromagnetic properties in Cr-based monolayers have been extensively studied. Cr$_2$AsP monolayer has been found to be an intrinsic ferromagnetic (FM) semiconductor with a exchange splitting bandgap of 0.15 eV. Doping CrI3 monolayer with 3d transition-metal (TM) atoms can tune its electron properties from semiconductor to metal/half-metal. Bulk CrSBr is a magnetic semiconductor with a strong ferromagnetic (FM) intralayer coupling. CrOF and CrOCl monolayers are ferromagnetic semiconductors with out-of-plane magnetic easy axis, and their magnetic anisotropy can be controlled and enhanced by applying biaxial strain. These studies provide insights into the properties of ferromagnetism in Cr-based monolayers, which have potential applications in spintronics and magnetic data storage.
Can magnetic help to synthesize mixed oxides?5 answersMagnetic materials have been used to synthesize mixed oxides in several studies. For example, Maleki et al. synthesized a nanorod magnetic Fe2O3@Fe3O4@Co3O4 composite catalyst using magnetic materials. Kostova et al. obtained nanocrystalline mixed oxides Fe2O3-ZnO through reactive milling, and the magnetic properties of the samples were evaluated. Sorescu et al. synthesized zirconium-doped hematite particles using mechanochemical activation and correlated the structural properties with sensing properties. Pal et al. synthesized mesoporous cobalt-silica-alumina mixed oxides using a slow evaporation method and studied their magnetic properties. Wang et al. developed a preparation method for a magnetic composite oxide that can be used as an adsorbent for negative ion pollutants. These studies demonstrate the use of magnetic materials in the synthesis and characterization of mixed oxides.
How can CrSe be used as a magnetic material?5 answersCrSe can be used as a magnetic material due to its unique magnetic properties and potential applications in spintronic devices. It has been demonstrated that ultrathin CrSe crystals can be synthesized via chemical vapor deposition (CVD) method, with grain size reaching the sub-millimeter scale. The controlled growth of continuous CrSe films can also be achieved through precise control of growth parameters. Importantly, the CVD-grown 2D CrSe crystals exhibit ferromagnetic properties at temperatures below 280 K, which is a significant finding. Furthermore, CrSe can be used in the formation of high-performance van der Waals magnetic tunnel junctions (MTJs) with large tunneling magnetoresistance (TMR) ratios and low resistance-area (RA) products. The spin-dependent tunnel transport associated with the ferromagnetic CrSe electrodes and the spin filtering effect of the bilayer NiCl2 barrier contribute to the high TMR ratio and low RA products in the CrSe/NiCl2/CrSe MTJ. These findings open up possibilities for the development of spintronic applications using CrSe as a magnetic material.
Who did the magnetic drug delivery for the first time?5 answersMagnetic drug delivery was first done by ###Kirsten M. Pondman et al.###.
How does basic conditions affect magnetite synthesis?2 answersThe basic conditions, such as temperature and base volume, have a significant impact on the synthesis of magnetite nanoparticles. Different synthesis parameters can affect the size, morphology, and magnetic properties of the particles. Co-precipitation synthesis, which is a convenient and cost-effective method, can produce fine and pure iron oxide particles. The temperature and base volume during co-precipitation synthesis influence the ability of magnetite nanoparticles to separate heavy metal ions. Magnetite synthesis under prebiotic conditions, in the presence of cyanide or thiocyanate, can result in the production of goethite and ferrihydrite in addition to magnetite. The type of precipitating agent, thermal treatment temperature, and concentration of the starting solution can affect the water-vapor sorption capacity of magnetite. The concentration of Fe ions during chemical synthesis can influence the size and size distribution of the obtained nanoparticles.