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<p>Surfactant-free copper nanoparticles (Cu NPs) were synthesized by pulsed laser ablation in liquids (PLALs) and incorporated into neat cement paste at an ultra-low dosage (7 ppm). Dynamic light scattering (DLS) showed a bimodal hydrodynamic size distribution (17&#xa0;±&#xa0;0.66 nm and 152&#xa0;±&#xa0;11.31 nm), while SEM of deposited particles revealed microscale agglomerates (~1.3 μm) with smaller clusters. After 28 days of curing, Cu NPs specimens exhibited a statistically significant increase in Young’s modulus under cyclic uniaxial compression, from 2.29 ± 0.12 to 3.09 ± 0.32 GPa (34.7%; one-way ANOVA, p = 0.02). Images of scanning electron microscopy provide qualitative morphological context consistent with the stiffness trend. As a complementary electrical assessment, DC polarization discharge tests yielded a modest, non-significant change in released charge within the selected time window. Overall, PLAL-synthesized Cu NPs offer a clean, reproducible route to enhancing elastic stiffness at very low dosage, motivating broader dosage and durability studies in future.</p> Graphical abstract <p></p>

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Elastic property enhancement of cementitious composites by ultra-low dosage copper nanoparticles synthesized by pulsed laser ablation in liquids

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Carlos A. Torres-Ramirez,
  • Daniel A. Triana-Camacho,
  • Jorge H. Quintero-Orozco

摘要

Surfactant-free copper nanoparticles (Cu NPs) were synthesized by pulsed laser ablation in liquids (PLALs) and incorporated into neat cement paste at an ultra-low dosage (7 ppm). Dynamic light scattering (DLS) showed a bimodal hydrodynamic size distribution (17 ± 0.66 nm and 152 ± 11.31 nm), while SEM of deposited particles revealed microscale agglomerates (~1.3 μm) with smaller clusters. After 28 days of curing, Cu NPs specimens exhibited a statistically significant increase in Young’s modulus under cyclic uniaxial compression, from 2.29 ± 0.12 to 3.09 ± 0.32 GPa (34.7%; one-way ANOVA, p = 0.02). Images of scanning electron microscopy provide qualitative morphological context consistent with the stiffness trend. As a complementary electrical assessment, DC polarization discharge tests yielded a modest, non-significant change in released charge within the selected time window. Overall, PLAL-synthesized Cu NPs offer a clean, reproducible route to enhancing elastic stiffness at very low dosage, motivating broader dosage and durability studies in future.

Graphical abstract