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<p>In this work, a modified electrophoretic deposition method, named High-Impulse Electrophoretic Deposition (HI-EPD), was used to coat bacterial cellulose with TiO<sub>2</sub> nanoparticles to modify the material wettability. Different samples were produced by varying the deposition time (8.0–22.0&#xa0;min) and the concentration (0.32–0.88 wt%) of the nanoparticles in the suspension. The water contact angles of the samples were measured, so that three samples were selected, the one with the lowest contact angle (11.8 ± 0.1)º, the intermediate value (30.7 ± 0.2)º and the higher value (41.1 ± 0.3)º, for more detailed characterizations. It was observed that the higher the TiO<sub>2</sub> concentration in the suspension, the greater the hydrophilicity and homogeneity of deposition, as verified by scanning electron microscopy (SEM). Deposition was confirmed by Fourier transform infrared analysis (FTIR) and X-ray diffractometry (XRD). Thermogravimetric analysis (TGA) shows that the higher the TiO<sub>2</sub> concentration in the suspension used for deposition, the better the thermal resistance of the material.</p>

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High-impulse electrophoretic deposition of TiO2 nanoparticles on bacterial cellulose

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • Aline R. Almeida,
  • Julio César Sagás,
  • Cristiane Stegemann,
  • Jair Nunes,
  • Henrique de Souza Medeiros,
  • Luis César Fontana,
  • Daniela Becker

摘要

In this work, a modified electrophoretic deposition method, named High-Impulse Electrophoretic Deposition (HI-EPD), was used to coat bacterial cellulose with TiO2 nanoparticles to modify the material wettability. Different samples were produced by varying the deposition time (8.0–22.0 min) and the concentration (0.32–0.88 wt%) of the nanoparticles in the suspension. The water contact angles of the samples were measured, so that three samples were selected, the one with the lowest contact angle (11.8 ± 0.1)º, the intermediate value (30.7 ± 0.2)º and the higher value (41.1 ± 0.3)º, for more detailed characterizations. It was observed that the higher the TiO2 concentration in the suspension, the greater the hydrophilicity and homogeneity of deposition, as verified by scanning electron microscopy (SEM). Deposition was confirmed by Fourier transform infrared analysis (FTIR) and X-ray diffractometry (XRD). Thermogravimetric analysis (TGA) shows that the higher the TiO2 concentration in the suspension used for deposition, the better the thermal resistance of the material.