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<p>Water adsorption in nanoporous carbons is a complex process due to the interplay between pore structure and surface chemistry. Sending an ultrasound wave through a nanoporous sample allows for the retrieval of a wealth of information, including the properties and spatial distribution of nanoconfined fluid. We used a novel adsorption-ultrasonic experimental setup to analyze the characteristics of ultrasound propagation through a xerogel sample while measuring its sorption isotherm by controlling relative humidity. The adsorption followed a type V isotherm, characteristic of weakly interacting carbon micropores and mesopores. Analysis of the elastic moduli revealed that confined water in mesopores deviates from bulk-like behavior. Additionally, the increase in ultrasonic attenuation during micropore filling suggested spatial heterogeneity in the water-filled pore space. This study demonstrates the utilization of non-destructive ultrasonic testing to probe both the fluid adsorption mechanism and the properties of an adsorbed phase in nanoporous materials.</p>

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Ultrasound propagation in water-sorbing carbon xerogel

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月5日

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  • Ashoka Karunarathne,
  • Stephan Braxmeier,
  • Boris Gurevich,
  • Alexei F. Khalizov,
  • Gudrun Reichenauer,
  • Gennady Y. Gor

摘要

Water adsorption in nanoporous carbons is a complex process due to the interplay between pore structure and surface chemistry. Sending an ultrasound wave through a nanoporous sample allows for the retrieval of a wealth of information, including the properties and spatial distribution of nanoconfined fluid. We used a novel adsorption-ultrasonic experimental setup to analyze the characteristics of ultrasound propagation through a xerogel sample while measuring its sorption isotherm by controlling relative humidity. The adsorption followed a type V isotherm, characteristic of weakly interacting carbon micropores and mesopores. Analysis of the elastic moduli revealed that confined water in mesopores deviates from bulk-like behavior. Additionally, the increase in ultrasonic attenuation during micropore filling suggested spatial heterogeneity in the water-filled pore space. This study demonstrates the utilization of non-destructive ultrasonic testing to probe both the fluid adsorption mechanism and the properties of an adsorbed phase in nanoporous materials.