Giant and isotropic magnetoresistance as huge as −53% was observed in magnetic manganese oxide La0.72Ca0.25MnOz films with an intrinsic antiferromagnetic spin structure. We ascribe this magnetoresistance to spin‐dependent electron scattering due to spin canting of the manganese oxide.

31p-S-4 Giant Magnetoresistance in Magnetic Manganese Oxide with Intrinsic Antiferromagnetic Spin Structure

Driven by functionality and purity demand for applications of inorganic nanoparticle colloids in optics, biology, and energy, their surface chemistry has become a topic of intensive research interest. Consequently, ligand-free colloids are ideal reference materials for evaluating the effects of surface adsorbates from the initial state for application-oriented nanointegration purposes. After two decades of development, laser synthesis and processing of colloids (LSPC) has emerged as a convenient and scalable technique for the synthesis of ligand-free nanomaterials in sealed environments. In addition to the high-purity surface of LSPC-generated nanoparticles, other strengths of LSPC include its high throughput, convenience for preparing alloys or series of doped nanomaterials, and its continuous operation mode, suitable for downstream processing. Unscreened surface charge of LSPC-synthesized colloids is the key to achieving colloidal stability and high affinity to biomolecules as well as support materials,...

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

well-written book that from actual documents differences between stro entific writing. It also of scientific writing by surface question of how ten to the deeper question are written as they are. make you a critical reader writing to allow you to style for various writing Chapters do not reac The Craft of Scientific cover), 1996 Writing is a uses examples to illustrate the T g and weak scidiscusses the style gsing beyond the things are writof why things This book can of scientific craft your own situations. like an English

Sliding Friction-Physical Principles and Applications

The oxides of copper (CuxO) are fascinating materials due to their remarkable optical, electrical, thermal and magnetic properties. Nanostructuring of CuxO can further enhance the performance of this important functional material and provide it with unique properties that do not exist in its bulk form. Three distinctly different phases of CuxO, mainly CuO, Cu2O and Cu4O3, can be prepared by numerous synthesis techniques including, vapour deposition and liquid phase chemical methods. In this article, we present a review of nanostructured CuxO focusing on their material properties, methods of synthesis and an overview of various applications that have been associated with nanostructured CuxO.

/pdf/nanostructured-copper-oxide-semiconductors-a-perspective-on-1jp7oze1fj.pdf

Nanostructured copper oxide semiconductors: a perspective on materials, synthesis methods and applications

Enzymes are highly efficient catalysts extensively employed in biotechnology. Among the many challenging aspects in this area, enzymes are yet difficult to obtain and purify, which makes them extremely expensive. Therefore, the industrial use of such expensive biocatalysts suffers from a critical point, which is the lack of efficient recovery processes. As a very promising strategy, superparamagnetic nanoparticles based on magnetite (Fe3O4) and maghemite (γ-Fe2O3) have been recently employed as supporting materials for enzymes, exhibiting striking characteristics, such as large surface area, mobility and high mass transference. More than that, they can be easily recovered by applying an external magnetic field. In addition to their excellent environmental compatibility, the use of such superparamagnetic nanoparticles represents an effective green chemistry approach, since it prolongs, through the successive recovery cycles, the useful lifetime of the biocatalyst. Several enzymes and biomolecules, including antibodies, albumin, α-chymotrypsin, aminopeptidase, acetylcholine esterase, amylase, amyloglucosidase, celullase, epoxide hydrolases, esterase, lipase, lysozyme, pectinases, phosphatase, pyruvate phosphate dikinase, trypsin, subtilisin, urease, chitosanase, haloalkane dehalogenase, RNA polymerase, lactate dehydrogenase, alcohol dehydrogenase, galactosidase, catalase, cholesterol oxidase, d -amino acid oxidase, cathecol dioxygenase, fructosyl amino acid oxidase, l -lactate dehydrogenase, xanthine oxidase, glucose oxidase, glucosidase, laccase, peroxidases, tyrosinase and so on, have been successfully immobilized onto magnetic nanoparticles, and the recent progress in this area is focused on this review.

Superparamagnetic nanoparticles as versatile carriers and supporting materials for enzymes

The angular dependence of the spin-lattice relaxation time of $^{19}\mathrm{F}$ in ${\mathrm{Dy}}^{3+}$-doped Sr${\mathrm{F}}_{2}$ samples was measured. A large increase in the anisotropy of ${T}_{1}$ was observed as the temperature was varied from 78 to 300 K with the emergence of several peaks. An explanation of this effect is proposed based upon the action of ${\mathrm{Dy}}^{3+}$ centers with trigonal and tetragonal symmetries and the onset of the "rapid diffusion" regime of nuclear spin-lattice relaxation.

Anisotropy of F 19 nuclear spin-lattice relaxation in Sr F 2 : Dy 3 +

It is well-known that the Ginzburg–Landau (GL) theory is a reliable and powerful theoretical tool to investigate the magnetic response of a superconducting state. However, in its standard form, this approach is not applicable to atomically uniform nano-thin superconducting films which are effective multiband superconductors. Here we discuss a relevant generalization of the GL theory, focusing on the underlying intraband-pairing approximation.

Nanofilms as effectively multiband superconductors: Intraband-pairing approximation and Ginzburg–Landau theory

We report the synthesis and characterization of RuSr 2 GdCu 2 O 8 -La 0.67 Sr 0.33 MnO 3 superconducting-magnetic composites with 0-50 wt% of La 0.67 Sr 0.33 MnO 3 in the composites. Systematic measurements of magnetization as a function of applied magnetic field at up 5 T were performed at temperature regimes below the Curie temperature (T c ) of La 0.67 Sr 0.33 MnO 3 but above the Neel temperature (T N ) of RuSr 2 GdCu 2 O 8 ; below T N of RuSr 2 GdCu 2 O 8 but above the superconducting critical temperature (Ts c ) of RuSr 2 GdCu 2 O 8 s; and below T sc of RuSr 2 GdCu 2 O 8 . Our results reveal the ferromagnetic character of the composites at the temperature regime T N 2 kOe) the ferromagnetic character of the system is recovered.

Weak exchange bias effect in RuSr2GdCu2O8-La0.67Sr0.33MnO3 composites

Commensurability effects can rise when vortex lattice interact with periodic pinning arrays on a superconductor. The ground-state properties of a two-dimensional system of superconducting vortices in the presence of a periodic array of strong pinning centers are studied through Monte Carlo simulation in the London limit. Anisotropy in melting temperature for vortex lattice interacting with rectangular pinning can be found through different anisotropy degree and vortex density prompting a smectic phase.

Effect of anisotropy in flux-lattice melting of superconductors with rectangular periodic pinning

Cobalt ferrite has attracted considerable attention in recent years due to its unique physical properties, such as high Curie temperature, large magnetocrystalline anisotropy, high coercivity, moderate saturation magnetization, large magnetostrictive coefficient, and excellent chemical stability and mechanical hardness. This work focuses on the neutron scattering results of the magnetic response characteristics of polysaccharide fucan coated cobalt ferrite nanoparticles for their application as a solid support for enzyme immobilization and other biotechnology applications. Here, we unambiguously show that surfactant coating of nanoparticles can significantly affect their magnetic response throughout the nanoparticle volume. While it has been recently suggested that oleic acid may preserve nanoscale magnetism in ferrites, we present evidence that the influence of oleic acid on the magnetic response of CoFe2O4 nanoparticles is more than a surface effect, instead pervading throughout the interior of the nanoparticle.

https://aip.scitation.org/doi/pdf/10.1063/5.0078167

J. Albino Aguiar

Papers

Anisotropy of F 19 nuclear spin-lattice relaxation in Sr F 2 : Dy 3 +

Nanofilms as effectively multiband superconductors: Intraband-pairing approximation and Ginzburg–Landau theory

Weak exchange bias effect in RuSr2GdCu2O8-La0.67Sr0.33MnO3 composites

Effect of anisotropy in flux-lattice melting of superconductors with rectangular periodic pinning

The effect of organic coatings in the magnetization of CoFe2O4 nanoparticles