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Volume 20 Issue 4, April 2021

Volume 20 Issue 4

Chirality-driven wound repair

Microporous annealed-particle degradable scaffolds have been developed and shown to induce type 2 innate and adaptive immune response that facilitated skin wound healing.

See Griffin et al. and Stelzel and Doloff

Image: An Chieh Feng (Scumpia lab, UCLA) and Chen-Hsiang Kuan (Plikus lab, UC Irvine). Cover Design: Thomas Phillips

Editorial

  • Editorial |

    From the discovery of the Seebeck effect in the nineteenth century to its application in the latest space probes, thermoelectrics have carved out a niche for reliable applications.

Comment

  • Comment |

    Strong light–matter coupling in quantum cavities provides a pathway to break fundamental materials symmetries, like time-reversal symmetry in chiral cavities. This Comment discusses the potential to realize non-equilibrium states of matter that have so far been only accessible in ultrafast and ultrastrong laser-driven materials.

    • Hannes Hübener
    • Umberto De Giovannini
    • Angel Rubio
  • Comment |

    Classical experiments from solid-state electrochemistry can be used to determine the charge of ions in solids. This Comment also clarifies how the charge of point defects fits with the standard picture of ionic charge, and highlights differences between these electrochemical experiments and methods that probe electrons directly.

    • Roger A. De Souza
    • David N. Mueller

News & Views

  • News & Views |

    Use of polymer and small-molecule semiconductors with relatively poor miscibility helps the long-term stability of the morphology and photovoltaic performance of bulk heterojunction films used in organic solar cells.

    • Andrew T. Kleinschmidt
    • Darren J. Lipomi
  • News & Views |

    Very low-density pulsed current is shown to sharply change the dislocation evolution pattern of Ti–Al alloy with 7 at.% Al, enhancing its strength and ductility.

    • Stefan Zaefferer
  • News & Views |

    A multifunctional device produces a much-improved thermoelectric-driven transverse voltage by exploiting a thermoelectric current to drive an anomalous Hall effect in a ferromagnet.

    • Andrew F. May
    • Brian C. Sales
  • News & Views |

    A microporous annealed particle biomaterial has been developed to induce an immune response that can enhance wound healing and tissue repair.

    • Jessica L. Stelzel
    • Joshua C. Doloff

Perspectives

  • Perspective |

    Thermoelectric materials can generate electricity from waste heat but can also use electricity for cooling. This Perspective discusses coefficients of performance for these systems and the state-of-the-art for materials, and suggests strategies for the discovery of improved thermoelectric materials.

    • Jun Mao
    • Gang Chen
    • Zhifeng Ren

Letters

  • Letter |

    Transverse thermeoelectrics can simplify devices as the electric field and heat gradient are perpendicular, but the power output is much less than in standard devices. Here, by forming a closed circuit of thermoelectric and magnetic materials, a much larger transverse thermopower is generated.

    • Weinan Zhou
    • Kaoru Yamamoto
    • Yuya Sakuraba

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