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<p>This study presents a cellulose nanocrystals (CNCs)/polydimethylsiloxane (PDMS) composite membrane for enhanced water vapor separation at elevated temperatures. CNCs/PDMS membranes were fabricated via a casting method and characterized for their permeability, selectivity, and thermal stability. Water vapor permeability was measured using a Payne diffusion cell coupled with a Dynamic Vapor Sorption instrument, while nitrogen gas permeability was determined with a gas permeation cell. The results indicate that incorporating 2% CNCs increased water vapor permeability by 24.8%, 30.9%, and 11.2% at 25&#xa0;°C, 50&#xa0;°C, and 80&#xa0;°C, respectively, with a slight improvement in selectivity (up to 3.1%). However, increasing CNC concentration beyond 2% led to slight reductions in permeability, attributed to nanoparticle aggregation. The thermal dimensional stability of the optimized membranes improved, as evidenced by an 8.9% reduction in the coefficient of thermal expansion. These findings suggest that CNC-reinforced PDMS membranes could be promising candidates for energy-efficient air dehydration applications, though further studies are needed to optimize CNC dispersion and long-term performance under industrial conditions.</p> Graphical abstract <p></p>

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Cellulose nanocrystals/polydimethylsiloxane hybrid membranes for air dehydration at elevated temperatures

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Nasim Alikhani,
  • Ling Li,
  • Jinwu Wang

摘要

This study presents a cellulose nanocrystals (CNCs)/polydimethylsiloxane (PDMS) composite membrane for enhanced water vapor separation at elevated temperatures. CNCs/PDMS membranes were fabricated via a casting method and characterized for their permeability, selectivity, and thermal stability. Water vapor permeability was measured using a Payne diffusion cell coupled with a Dynamic Vapor Sorption instrument, while nitrogen gas permeability was determined with a gas permeation cell. The results indicate that incorporating 2% CNCs increased water vapor permeability by 24.8%, 30.9%, and 11.2% at 25 °C, 50 °C, and 80 °C, respectively, with a slight improvement in selectivity (up to 3.1%). However, increasing CNC concentration beyond 2% led to slight reductions in permeability, attributed to nanoparticle aggregation. The thermal dimensional stability of the optimized membranes improved, as evidenced by an 8.9% reduction in the coefficient of thermal expansion. These findings suggest that CNC-reinforced PDMS membranes could be promising candidates for energy-efficient air dehydration applications, though further studies are needed to optimize CNC dispersion and long-term performance under industrial conditions.

Graphical abstract