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Solid-State Electrochemical Thermal Switches with Large Thermal Conductivity Switching Widths.

ABSTRACT: Thermal switches that switch the thermal conductivity (κ) of the active layers are attracting increasing attention as thermal management devices. For electrochemical thermal switches, several transition metal oxides (TMOs) are proposed as active layers. After electrochemical redox treatment, the crystal structure of the TMO is modulated, which results in the κ switching. However, the κ switching width is still small (<4 W m^-1 K^-1). In this study, it demonstrates that LaNiO_x-based solid-state electrochemical thermal switches have a κ switching width of 4.3 W m^-1 K^-1. Fully oxidized LaNiO₃ (on state) has a κ of 6.0 W m^-1 K^-1 due to the large contribution of electron thermal conductivity (κ_ele, 3.1 W m^-1 K^-1). In contrast, reduced LaNiO_2.72 (off state) has a κ of 1.7 W m^-1 K^-1 because the phonons are scattered by the oxygen vacancies. The LaNiO_x-based electrochemical thermal switch is cyclable of κ and the crystalline lattice of LaNiO_x. This electrochemical thermal switch may be a promising platform for next-generation devices such as thermal displays.

SUBMITTER: Bian Z

PROVIDER: S-EPMC11348128 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Solid-State Electrochemical Thermal Switches with Large Thermal Conductivity Switching Widths.

Bian Zhiping Z Yoshimura Mitsuki M Jeong Ahrong A Li Haobo H Endo Takashi T Matsuo Yasutaka Y Magari Yusaku Y Tanaka Hidekazu H Ohta Hiromichi H

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20240625 32

Thermal switches that switch the thermal conductivity (κ) of the active layers are attracting increasing attention as thermal management devices. For electrochemical thermal switches, several transition metal oxides (TMOs) are proposed as active layers. After electrochemical redox treatment, the crystal structure of the TMO is modulated, which results in the κ switching. However, the κ switching width is still small (<4 W m<sup>-1</sup> K<sup>-1</sup>). In this study, it demonstrates that LaNiO< ...[more]

PMID: 38923788

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Project description:A challenge in the application of solid-state NMR spectroscopy to membrane peptides and proteins is the relatively broad line widths compared to those for solution NMR spectra. To understand the linewidth contributions to membrane protein NMR spectra, we have measured the inhomogeneous and homogeneous line widths of several well-studied membrane peptides under immobilized conditions. (13)C T(2) relaxation times of uniformly (13)C-labeled residues show that the homogeneous line widths of the peptides are comparable to those of crystalline model compounds under identical (1)H decoupling and magic angle spinning conditions, indicating that the homogeneous line widths are determined by conformation-independent factors, including residual dipolar coupling, J-coupling, and intrinsic T(2) relaxation. However, the membrane peptides exhibit larger apparent line widths than the crystalline compounds, indicating conformational disorder. A cationic cell-penetrating peptide, the human immunodeficiency virus TAT, exhibits the largest apparent line widths, which are about five-fold larger than the homogeneous line widths, while the transmembrane helix of the influenza M2 peptide and the β-hairpin antimicrobial peptide PG-1 show moderately larger apparent line widths than the crystalline compounds. These results are consistent with the random coil nature of the TAT peptide, which contrasts with the intramolecularly hydrogen bonded M2 and PG-1. Cross peak line shapes of 2D double-quantum correlation spectra show that the conformational disorder can occur at the residue level and can result from three origins, lipid-peptide interaction, intrinsic conformational disorder encoded in the amino acid sequence, and side-chain rotameric averaging. A particularly important lipid-peptide interaction for cationic membrane peptides is guanidinium-phosphate ion pair interaction. Thus, NMR line widths and line shapes are useful for understanding the conformational disorder of membrane peptides and proteins.

Dataset Information

Solid-State Electrochemical Thermal Switches with Large Thermal Conductivity Switching Widths.

Publications

Solid-State Electrochemical Thermal Switches with Large Thermal Conductivity Switching Widths.

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