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<p>This work explores how the silane modification of SiO<sub>2</sub>-Ag hybrid nanoparticles can significantly enhance both the mechanical and antibacterial properties of acrylic polyurethane (APU) coatings. For this purpose, firstly, SiO<sub>2</sub>-Ag hybrid nanoparticles have been fabricated by chemical reduction of Ag<sup>+</sup> ion precursors on the surface of commercial nano-SiO<sub>2</sub> nanoparticles (20&#xa0;nm) using sodium borohydride in aqueous solution. Secondly, these SiO<sub>2</sub>-Ag hybrid nanoparticles (Ag: 10&#xa0;nm; SiO<sub>2</sub>: 20&#xa0;nm) have been organically modified by using (3-glycidoxypropyl)trimethoxysilane&#xa0;(GPTMS) as a silane coupling agent. Thirdly, both pure and modified SiO<sub>2</sub>-Ag hybrid nanoparticles (SiO<sub>2</sub>-Ag) have been added to the acrylic polyurethane (APU) coating matrices (at 0.5–4 wt.%). Data from XRD, EDX and UV-Vis confirmed the presence of both SiO<sub>2</sub> and AgNPs in the hybrid structure of SiO<sub>2</sub>-Ag nanoparticles. FTIR, TGA and WCA studies confirmed the successful GPTMS modification for SiO<sub>2</sub>-Ag. Data from mechanical tests indicated that the incorporation of both SiO<sub>2</sub>-Ag types into the APU coating enhanced its mechanical properties, with a 2 wt.% concentration being the best. Interestingly, modified SiO<sub>2</sub>-Ag (GPTMS-SiO<sub>2</sub>-Ag) provided more enhancement of the mechanical properties of APU coatings, as compared to the unmodified SiO<sub>2</sub>-Ag. By GPTMS modification, at a content of 2 wt.%, the abrasion resistance rose from 241.5&#xa0;L.mil<sup>-1</sup> to 258.4&#xa0;L.mil<sup>-1</sup> , whereas impact strength increased from 190 to 195&#xa0;kg.cm, and relative hardness increased from 0.59 to 0.67. The antibacterial test indicated that after 24&#xa0;h of incubation, the number of <i>E. coli</i> viable cells was 145&#xa0;CFU/mL on the surface of APU-SiO<sub>2</sub>-Ag coating, whereas no viable cells were detected on the surface of APU-GPTMS-SiO<sub>2</sub>-Ag coating.</p> Graphical abstract <p></p>

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Silane modified SiO2-Ag hybrid nanoparticles for enhanced mechanical and antibacterial properties of acrylic polyurethane coating

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Truc Vy Do,
  • Thi Mat Le,
  • Thien Vuong Nguyen,
  • The Huu Nguyen,
  • Ram K. Gupta,
  • Tuan Anh Nguyen

摘要

This work explores how the silane modification of SiO2-Ag hybrid nanoparticles can significantly enhance both the mechanical and antibacterial properties of acrylic polyurethane (APU) coatings. For this purpose, firstly, SiO2-Ag hybrid nanoparticles have been fabricated by chemical reduction of Ag+ ion precursors on the surface of commercial nano-SiO2 nanoparticles (20 nm) using sodium borohydride in aqueous solution. Secondly, these SiO2-Ag hybrid nanoparticles (Ag: 10 nm; SiO2: 20 nm) have been organically modified by using (3-glycidoxypropyl)trimethoxysilane (GPTMS) as a silane coupling agent. Thirdly, both pure and modified SiO2-Ag hybrid nanoparticles (SiO2-Ag) have been added to the acrylic polyurethane (APU) coating matrices (at 0.5–4 wt.%). Data from XRD, EDX and UV-Vis confirmed the presence of both SiO2 and AgNPs in the hybrid structure of SiO2-Ag nanoparticles. FTIR, TGA and WCA studies confirmed the successful GPTMS modification for SiO2-Ag. Data from mechanical tests indicated that the incorporation of both SiO2-Ag types into the APU coating enhanced its mechanical properties, with a 2 wt.% concentration being the best. Interestingly, modified SiO2-Ag (GPTMS-SiO2-Ag) provided more enhancement of the mechanical properties of APU coatings, as compared to the unmodified SiO2-Ag. By GPTMS modification, at a content of 2 wt.%, the abrasion resistance rose from 241.5 L.mil-1 to 258.4 L.mil-1 , whereas impact strength increased from 190 to 195 kg.cm, and relative hardness increased from 0.59 to 0.67. The antibacterial test indicated that after 24 h of incubation, the number of E. coli viable cells was 145 CFU/mL on the surface of APU-SiO2-Ag coating, whereas no viable cells were detected on the surface of APU-GPTMS-SiO2-Ag coating.

Graphical abstract