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Nanoscale control of morphologies enables robust and elastic ionogel for sensitive and high-resolution pressure sensing over wide linear range.

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Title: Nanoscale control of morphologies enables robust and elastic ionogel for sensitive and high-resolution pressure sensing over wide linear range.
Authors: Guo, Mengru1,2 (AUTHOR), Zhao, Xiangjie1,2 (AUTHOR), Xu, Jiaheng3 (AUTHOR), Su, Yuanteng1,2 (AUTHOR), Lei, Sihang1,2 (AUTHOR), Xiao, Shiru1,2 (AUTHOR), Liu, Ziyi1,2 (AUTHOR), Zhang, Mengtong1,2 (AUTHOR), Yin, Hongzong1,2 (AUTHOR), Wang, Xiaolin1,2 (AUTHOR) xwang@sdau.edu.cn
Source: Chemical Engineering Journal. Mar2025, Vol. 508, pN.PAG-N.PAG. 1p.
Subjects: Young's modulus, Pressure sensors, Signal detection, Detection limit, Phase separation
Abstract: [Display omitted] • A robust and elastic ionogel with tissue-matched softness is developed. • Morphologies from fibrous to island and bicontinuous microstructures are revealed. • Regulation of nanostructured morphologies on sensing-related properties is studied. • The ionogel pressure sensor is applied for ultra-broad-range body signal detection. • The sensor achieves low detection limit, high sensitivity and pressure resolution. Ionogel, an excellent biomimetic sensing material due to high stability and wide operating temperature range, holds substantial promise for wearable devices, while still possesses big challenges in integration of desirable mechanical properties and sensing performance via straightforward strategies. Here, a tailored ionogel with tissue-matched softness (Young's modulus <10.7 ± 0.8 kPa), appropriate adhesion, remarkable compression resistance (>1 MPa), resilience and sensing reliability by copolymerizing two homologous monomers of acrylamide and N,N -dimethylacrylamide in 1-ethyl-3-methylimidazolium trifluoromethanesulfonate is developed by phase separation. Through fine adjustment of components, nanoscale transformation of microstructures from nanoporous structure to island structure, followed by bicontinuous structures results in distinct impact on optical, thermal, mechanical, and conductive properties of ionogels, and the intricate effects of phase-separated degree on nanoscale structural features and macroscopic performance have been revealed. The resultant ionogels are readily manufactured to versatile sensors for precise detection of body signals from subtle pulse to large body weights, achieving low detection limit (8 Pa), high pressure resolution (0.055 %) and good sensitivity (1.2 kPa−1) over a broad linear range (0.008–1000 kPa), together with rapid response speed of tens of milliseconds and recovery speed of ∼20 s under extreme compression. This work delves into essential correlation between nanostructures of ionogel and its properties, and we expect the approach of tailoring functions of soft matter by hierarchical structures to provide guidance for future fabrication of flexible sensors in target applications. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Nanoscale control of morphologies enables robust and elastic ionogel for sensitive and high-resolution pressure sensing over wide linear range.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Chemical+Engineering+Journal%22&quot;&gt;Chemical Engineering Journal&lt;/searchLink&gt;. Mar2025, Vol. 508, pN.PAG-N.PAG. 1p.
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  Data: [Display omitted] • A robust and elastic ionogel with tissue-matched softness is developed. • Morphologies from fibrous to island and bicontinuous microstructures are revealed. • Regulation of nanostructured morphologies on sensing-related properties is studied. • The ionogel pressure sensor is applied for ultra-broad-range body signal detection. • The sensor achieves low detection limit, high sensitivity and pressure resolution. Ionogel, an excellent biomimetic sensing material due to high stability and wide operating temperature range, holds substantial promise for wearable devices, while still possesses big challenges in integration of desirable mechanical properties and sensing performance via straightforward strategies. Here, a tailored ionogel with tissue-matched softness (Young&#39;s modulus &lt;10.7 &#177; 0.8 kPa), appropriate adhesion, remarkable compression resistance (&gt;1 MPa), resilience and sensing reliability by copolymerizing two homologous monomers of acrylamide and N,N -dimethylacrylamide in 1-ethyl-3-methylimidazolium trifluoromethanesulfonate is developed by phase separation. Through fine adjustment of components, nanoscale transformation of microstructures from nanoporous structure to island structure, followed by bicontinuous structures results in distinct impact on optical, thermal, mechanical, and conductive properties of ionogels, and the intricate effects of phase-separated degree on nanoscale structural features and macroscopic performance have been revealed. The resultant ionogels are readily manufactured to versatile sensors for precise detection of body signals from subtle pulse to large body weights, achieving low detection limit (8 Pa), high pressure resolution (0.055 %) and good sensitivity (1.2 kPa−1) over a broad linear range (0.008–1000 kPa), together with rapid response speed of tens of milliseconds and recovery speed of ∼20 s under extreme compression. This work delves into essential correlation between nanostructures of ionogel and its properties, and we expect the approach of tailoring functions of soft matter by hierarchical structures to provide guidance for future fabrication of flexible sensors in target applications. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Chemical Engineering Journal is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.cej.2025.160913
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Young's modulus
        Type: general
      – SubjectFull: Pressure sensors
        Type: general
      – SubjectFull: Signal detection
        Type: general
      – SubjectFull: Detection limit
        Type: general
      – SubjectFull: Phase separation
        Type: general
    Titles:
      – TitleFull: Nanoscale control of morphologies enables robust and elastic ionogel for sensitive and high-resolution pressure sensing over wide linear range.
        Type: main
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            NameFull: Guo, Mengru
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            NameFull: Zhao, Xiangjie
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            NameFull: Xu, Jiaheng
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            NameFull: Su, Yuanteng
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            NameFull: Wang, Xiaolin
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            – D: 15
              M: 03
              Text: Mar2025
              Type: published
              Y: 2025
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              Value: 508
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