1. Comparative Study of the Antimicrobial Effect of Nanocomposites and Composite Based on Poly(butylene adipate-co-terephthalate) Using Cu and Cu/Cu2O Nanoparticles and CuSO4
- Author
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Eduardo Pérez-Tijerina, Carlos Medina, S. A. Riquelme, A. F. Jaramillo, Gabriela Sánchez-Sanhueza, C. Montalba, Manuel F. Meléndrez, D. Rojas, and F. Solis-Pomar
- Subjects
Thermogravimetric analysis ,Materials science ,Composite number ,chemistry.chemical_element ,02 engineering and technology ,Antimicrobial activity ,010402 general chemistry ,01 natural sciences ,law.invention ,Differential scanning calorimetry ,law ,lcsh:TA401-492 ,PBAT ,General Materials Science ,Thermal stability ,Fourier transform infrared spectroscopy ,Crystallization ,Nanocomposite ,Nano Express ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Copper ,0104 chemical sciences ,chemistry ,lcsh:Materials of engineering and construction. Mechanics of materials ,Copper nanoparticles ,0210 nano-technology ,Bio-nanocomposite ,Nuclear chemistry - Abstract
Nanocomposites and a composite based on poly(butylene adipate-co-terephthalate) (PBAT) were synthesized using commercial copper nanoparticles (Cu-NPs), copper/cuprous oxide nanoparticles (Cu|Cu2O-NPs), and copper sulfate (CuSO4), respectively. The Cu|Cu2O-NPs were synthesized using chemical reduction and characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The synthesis of Cu|Cu2O-NPs yielded a mixture of Cu and Cu2O, with metal Cu having a spherical morphology of approximately 40 nm in diameter and Cu2O with a diameter of 150 nm. To prepare the nanocomposites (NCs) and the composite material (MC), the NPs and the CuSO4 salt were incorporated into the PBAT matrix in concentrations of 1, 3, and 5% p/p via an ex situ method. Fourier transform infrared spectroscopy (FTIR), a tensile test, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and agar diffusion assays were used for structural, thermomechanical, and antimicrobial characterization. Results showed that the reinforcements did not modify the chemical structure of the PBAT and only slightly increased the percentage of crystallization. The mechanical and thermal properties of the PBAT did not change much with the addition of fillers, except for a slight increase in tensile strength and thermal stability, respectively. The agar diffusion antimicrobial assays showed that the NCs and MCs had good inhibitory responses against the nonresistant strains Enterococcus faecalis, Streptococcus mutans, and Staphylococcus aureus. The MCs based on CuSO4 had the highest biocidal effect, even against the resistant bacteria Acinetobacter baumannii. Electronic supplementary material The online version of this article (10.1186/s11671-019-2987-x) contains supplementary material, which is available to authorized users.
- Published
- 2019