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<p>Electrospun polyvinyl butyral (PVB)/SiO₂ nanofiber membranes incorporating rice husk ash (RHA)–derived silica were developed to enhance hydrophobic surface characteristics. Amorphous SiO₂ obtained from RHA via controlled thermal treatment (600&#xa0;°C, 4h) exhibited a specific surface area of approximately 154&#xa0;m<sup>2</sup>/g and was subsequently incorporated into PVB. After silane surface modification, the water contact angle on the nanofiber membranes increased from 89.8 to 111.2°, exceeding the hydrophobicity threshold defined in ASTM D7334. Standardized AATCC 22 spray tests further confirmed improved water repellency, achieving a rating of 90 (equivalent to ISO grade 4). These results are consistent with a Cassie–Baxter-type interfacial state associated with the hierarchical porous structure of the nanofiber network. Such structure-induced wetting characteristics reduce surface water adhesion while preserving the intrinsic porosity of the nanofiber network.</p>

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Hydrophobic Electrospun PVB/SiO₂ Nanofiber Membranes Incorporating Rice Husk Ash-Derived Silica

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月16日

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  • Cheng-Kun Chu

摘要

Electrospun polyvinyl butyral (PVB)/SiO₂ nanofiber membranes incorporating rice husk ash (RHA)–derived silica were developed to enhance hydrophobic surface characteristics. Amorphous SiO₂ obtained from RHA via controlled thermal treatment (600 °C, 4h) exhibited a specific surface area of approximately 154 m2/g and was subsequently incorporated into PVB. After silane surface modification, the water contact angle on the nanofiber membranes increased from 89.8 to 111.2°, exceeding the hydrophobicity threshold defined in ASTM D7334. Standardized AATCC 22 spray tests further confirmed improved water repellency, achieving a rating of 90 (equivalent to ISO grade 4). These results are consistent with a Cassie–Baxter-type interfacial state associated with the hierarchical porous structure of the nanofiber network. Such structure-induced wetting characteristics reduce surface water adhesion while preserving the intrinsic porosity of the nanofiber network.