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<p>This study developed amino cellulose nanofibers (A-CNFs) with exceptional optical, mechanical and antibacterial properties through a novel two-step process. Bleached softwood kraft pulp (BSKP) was treated firstly with methanesulfonyl chloride (MsCl) to produce methylsulfonylated cellulose, followed by ammoniation to introduce amino groups. Subsequent high-pressure homogenization yielded A-CNFs with controlled amino content (0.15–0.76&#xa0;mmol/g). The resulting A-CNFs retained the native cellulose Iβ crystalline structure while achieving nanoscale dimensions (&lt; 20&#xa0;nm width, &gt; 1&#xa0;μm length) and good thermal stability (<i>T</i><sub>10%</sub> = 277–316&#xa0;°C, <i>T</i><sub>max</sub> = 329–342&#xa0;°C). The amino-functionalized CNFs demonstrated remarkable antibacterial efficacy (&gt; 90% inhibition) against <i>Escherichia coli</i> and <i>Pediococcus acidilactici</i> at 200&#xa0;μg/mL, attributable to the presence of amino groups. Furthermore, vacuum-filtrated A-CNF films exhibited outstanding optical properties (62–84% transmittance, 89–94% haze) combined with high ultimate tensile strength (140 ± 20&#xa0;MPa), reflecting the superior structural integrity of A-CNFs. This work establishes an efficient pathway for producing multifunctional A-CNFs with significant potential in high-performance antibacterial and optical materials.</p>

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Preparation of amino-functionalized cellulose nanofibers with excellent optical, mechanical, and antibacterial properties

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • Hongxiang Xie,
  • Dexiang Lu,
  • Aoran Wang,
  • Yue Niu,
  • Ziying Wang,
  • Kaijie Liu,
  • Shuliang Ji,
  • Minjie Guo

摘要

This study developed amino cellulose nanofibers (A-CNFs) with exceptional optical, mechanical and antibacterial properties through a novel two-step process. Bleached softwood kraft pulp (BSKP) was treated firstly with methanesulfonyl chloride (MsCl) to produce methylsulfonylated cellulose, followed by ammoniation to introduce amino groups. Subsequent high-pressure homogenization yielded A-CNFs with controlled amino content (0.15–0.76 mmol/g). The resulting A-CNFs retained the native cellulose Iβ crystalline structure while achieving nanoscale dimensions (< 20 nm width, > 1 μm length) and good thermal stability (T10% = 277–316 °C, Tmax = 329–342 °C). The amino-functionalized CNFs demonstrated remarkable antibacterial efficacy (> 90% inhibition) against Escherichia coli and Pediococcus acidilactici at 200 μg/mL, attributable to the presence of amino groups. Furthermore, vacuum-filtrated A-CNF films exhibited outstanding optical properties (62–84% transmittance, 89–94% haze) combined with high ultimate tensile strength (140 ± 20 MPa), reflecting the superior structural integrity of A-CNFs. This work establishes an efficient pathway for producing multifunctional A-CNFs with significant potential in high-performance antibacterial and optical materials.