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

We have performed an experimental study of magnetic and magneto‐transport properties on a polycrystalline sample of RuSr2GdCu2O8 (Ru‐1212) Two peaks in the derivative of the resistive curves were identified in the temperature T1 = 43 K and T2 = 34 K at zero magnetic field The magnetization presents an increase, at the same temperature T2 of the resistive curves, followed by a decrease at lower temperatures, which leads to the appearance of a peak in the magnetization versus temperature plots upon entering of superconducting state We discuss how the anomalies observed in the magnetic and electric measurements could be originated by fault in the stoichiometric of Ru‐1212

Magnetic and Electric Properties of RuSr2GdCu2O8

We report measurements of the magnetization and diamagnetic susceptibility of a polycrystal of LaBaCaCu3O7-δ The sample has a zero-field transition temperature Tc0 = 77 K and a transition width of 20 K The results show large fluctuation effects, which can be explained by Ginzburg-Landau fluctuation theory for a two-dimensional (2D) system The experimental data for the magnetization in high magnetic fields (20-50 kOe), were fitted by using a theoretical model based on the lowest-Landau-levels approximation, showing good agreement The weak-field fluctuation diamagnetic susceptibility above Tc can be fitted well in terms of the 2D Lawrence-Doniach model

https://iopscience.iop.org/article/10.1088/0953-8984/13/2/310/pdf

Evidence for two-dimensional superconducting fluctuations in CaLaBaCu3O7-δ

In this work, the effect of substitution of Zn for Cu on the superconducting properties of CaLaBaCu3O7−δ has been studied. CaLaBa[Cu1−xZnx]3O7−δ samples present a sharp superconducting transition with a transition width that increases with x. The depletion of Tc with x is consistent with a non magnetic disordering model.

Study of transport properties of CaLaBa[Cu1−xZnx]3O7−δ superconductors

The magnetic and electronic properties of Eu2Ru2O7 are discussed in terms of the local ruthenium and europium coordinations, electronic band structure calculations and molecular orbital energy levels. A preliminary electronic structure was calculated within the LDA and LSDA+U approximations. The molecular orbital energy level diagrams have been used to interpret the Eu-Ru ligand spectrum and the ensuing magnetic properties. The orbital hybridizations and bonds are discussed.

Ruthenium-Europium configuration in the Eu2Ru2O7 pyrochlore

Effective surface resistance and effective inductance concepts are used to investigate the influence of the film thickness on wave propagation in a wide superconducting microstrip. Surface impedance and attenuation coefficient are theoretically obtained as a function of both the film and the dielectric thickness for a wide microstrip resonator of YBCO thin film on both sides of MgO substrate.

J. Albino Aguiar

Papers

Magnetic and Electric Properties of RuSr2GdCu2O8

Evidence for two-dimensional superconducting fluctuations in CaLaBaCu3O7-δ

Study of transport properties of CaLaBa[Cu1−xZnx]3O7−δ superconductors

Ruthenium-Europium configuration in the Eu2Ru2O7 pyrochlore

Effective propagation parameters of superconducting wide microstrips