Gd-admixed (Lu,Gd)AlO3 single crystals: breakthrough in heavy perovskite scintillators

We report a breakthrough concept for a bulk single crystal as a heavy aluminum perovskite scintillator, where due to bandgap engineering by a balanced Gd admixture in a Lu cation sublattice...

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    SPECIAL ISSUE on Hydrogels and Hydrogel-related Healing Materials | Hydrogels are of great interests from the viewpoints of their diverse applications such as disposal water absorbent, tissue engineering, drug delivery, etc. New synthetic techniques as well as analytical methods have opened new gates to intelligent and advanced hydrogel-related materials. (Submission deadline: 31OCT2021)

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    Approaching the ultimate superconducting properties of (Ba,K)Fe2As2 by naturally formed low-angle grain boundary networks

  • Special Issue on Biomaterials and Health-care related Materials

    SPECIAL ISSUE | The demand for biomaterials and health-care related materials in various medical applications has been increasing significantly across the globe over the last decade, and has been even more acute these days. This special issue of NPG Asia Materials, “Biomaterials and health-care related materials” is aimed at providing the recent advances in fundamental research on biomaterials…

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  • High critical current density and strong pinning efficiency for Fe-based superconductor, K-doped BaFe2As2, were achieved by naturally formed low-angle grain boundary networks. K-doped BaFe2As2 thin film is composed of columnar grains with widths of approximately 30–60 nm. The grains are rotated around the b- (or a-) axis by 1.5° and around the c-axis by −1°, resulting in the formation of low-angle grain boundary networks. The achieving superconducting properties are almost 10 times as high as the K-doped BaFe2As2 single crystal and comparable to ion-irradiated single crystal.

    • Kazumasa Iida
    • Dongyi Qin
    • Akiyasu Yamamoto
    Article Open Access
  • This paper reports a voltage-controlled nonvolatile 90° magnetization rotation and voltage-assisted 180° magnetization reversal in a spin-valve multiferroic heterostructure. By using the strain-mediated magnetoelectric coupling effect, the magnetic moment of the free layer can be manipulated by an electric field. The critical magnetic field required for complete 180° magnetization reversal can be tremendously reduced. Accordingly, a large and nonvolatile magnetoresistance modulation was achieved.

    • Mengli Liu
    • Wei Du
    • Xiaoli Tang
    Article Open Access
  • The timely and continuous measurement of cortical maps is required for studying the nature and plasticity of brain maps. In this work, we developed the multichannel graphene array that enables high-resolution brain mapping, facilitating rapid and repetitive assessments of brain maps. The advanced graphene array with intervening thru-hole enables large-scale mapping simultaneously in the surface and deep of cortical areas, also improving conformality for better detection of electrocorticography signals. In a subset of the graphene array, cortical surface stimulation can remodel cortical maps, therein enhancing cortical plasticity. This technology provides potential therapeutic applications for various brain disorders by correcting brain maps.

    • Minseok Lee
    • Sangwon Lee
    • Sungchil Yang
    Article Open Access
  • A shape-variant heat dissipation system using kirigami was proposed using the thermally conductive cellulose nanofiber films. By stretching the Amikazari (net decoration) pattern produced by kirigami and allowing air convection through its aperture at 3.0m/s, the thermal resistance was reduced to approximately one-fifth of that without kirigami and convection. The periodic apertures of kirigami defined the outlet air velocity of convection, resulting in a significant increase in the heat-transfer coefficient. We further demonstrated the effective cooling of the kirigami-processed powder electroluminescent device during the emission of light.

    • Kojiro Uetani
    • Keitaro Kasuya
    • Masaya Nogi
    Article Open Access
  • Multiferroic lead-doped barium hexaferrite exhibits remarkably rich set of phenomena at frequencies from Hertz to near infrared, including tunable terahertz resonance. Unveiling microscopic mechanisms responsible for such extraordinary response paves the way for controllable tuning of the functional characteristics of the material demanded by next-generation terahertz electronics.

    • L. N. Alyabyeva
    • A. S. Prokhorov
    • B. P. Gorshunov
    Article Open Access
  • Significant size effect and stress fluctuation of nanoscale lamellar bone pillars with diameters ranging from 640 to 4971 nm inside a single lamella. A size effect-induced brittle-to-ductile transition was revealed, the stress fluctuation behaviors were elaborated through a layered dislocation movement theory on the basis of strain gradient plasticity theory.

    • Zhichao Ma
    • Zhenfeng Qiang
    • Luquan Ren
    Article Open Access
  • Based on the first-principles calculation on the β-W based alloy structure using Ta and V, we have introduced the W–Ta and W–V alloy in between the β-W/CoFeB layer. Through the harmonic response method, we confirmed that experimentally obtained spin-Hall conductivity has fairly similar alloy compositional dependence with the theoretically calculated one. Particularly, when W80V20 alloy was placed at the β-W/CoFeB layer, the spin Hall conductivity reached (−2.77 ± 0.31) × 103 S/cm, which enhanced over 36% compared to the pristine β-W/CoFeB/MgO heterostructure.

    • Gyu Won Kim
    • Do Duc Cuong
    • Young Keun Kim
    Article Open Access
  • A large-scale and ultrafast combustion synthesis using CO2 as feedstock is demonstrated for the fabrication of nitrogen-enriched graphene frameworks (NGF) with high electrical conductivity, which delivers an upgraded kinetics due to the enhanced ion diffusion and electron transport. Lithium-ion capacitors based on NGF as both cathode and anode exhibit a high gravimetric energy density of 151 Wh kg−1 and power output of 49 kW kg−1. This study reveals an effective pathway to achieve synergistic kinetics in electrode materials for high-performance electrochemical energy storage.

    • Chen Li
    • Xiong Zhang
    • Yanwei Ma
    Article Open Access
Special Issue on Biomaterials and Health-care related Materials

Special Issue on Biomaterials and Health-care related Materials

The demand for biomaterials and health-care related materials in various medical applications has been increasing significantly across the globe over the last decade, and has been even more acute these days. This special issue of NPG Asia Materials, “Biomaterials and health-care related materials” is aimed at providing the recent advances in fundamental research on biomaterials, biointeractions, health-care and wearable health-monitoring materials, as well as the forefront of their medical applications. The issue covers original research and comprehensive review articles on topics ranging from biochemistry, biomaterials and biointerfaces to functional bio-devices for advanced research and healthcare systems.
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