In this work, a borosilicate glass sample (5SiO -45B 2 O 3 -20Na 2 O-25CaO-5Ag 2 O) was added to nano-sized carbonated hydroxyapatite (CHA) powders with different contents up to 20 wt.% to improve the bioactivity, antibacterial effect, physical and mechanical properties of the resulting nanocomposites. Then, these samples were mixed, milled with a high-energy ball mill, sintered at 700°C and subjected to Xray diffraction (XRD) technique, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) to examine their structure, chemical composition and microstructure, respectively. Furthermore, the physical and mechanical properties of the sintered nanocomposites were also measured. Moreover, the in vitro bioactivity of the prepared nanocomposites was examined with XRD and SEM. Additionally, the antibacterial behavior of these samples was tested against E. coli and S. aureus by the disc-diffusion method. The results obtained pointed out that the sample with the highest content of BG possessed the best bioactivity, antibacterial effect, physical and mechanical properties.
In the present work, we have synthesized zinc oxide nanoparticles by two different methods simple solution route and sol-gel (Z1, Z2). SEM analysis of ZnO nanoparticles samples (Z1 and Z2) showed that, the morphology of samples found to be look like nanorods. Transmission Electron Microscopy (TEM) images showed that the particles are spherical, and the particles size of sample Z2 larger than sample Z1. The partial size of sample Z1 is between 17.61 to 2.81 nm and for sample Z2 was between 25 to 6 nm. Also, thin films of ZnO/Chiosan nanocomposites (Z11and Z21) were prepared to study dielectric and antibacterial properties. Results showed that, the value of the dielectric constant for sample Z11 is less than the value of Z 21, it is may be due to different in particles size according to the space-charge theory (dielectric constant increase with increasing of particles size). Frequency dependence dielectric properties of ZnO/Chiosan thin films (Z11 and Z21) at room temperature were measured. Dielectric constant ε' and dielectric loss ε" for all samples were found to be decrease with increasing frequency.The synthesized ZnO/Chiosan nanocomposite films exhibited activity against Gram-negative Pseudomonas aeruginosa (PA), and Gram-positive Staphylococcus aureus (SA).All results indicated that, the antimicrobial activity of the nanocomposite film samples due to presence of nano ZnO particles.
In this work, a borosilicate glass sample (5SiO2-45B2O3-20Na2O-25CaO-5Ag2O) was added to nano-sized carbonated hydroxyapatite (CHA) powders with different contents up to 20 wt.% to improve the bioactivity, antibacterial effect, physical and mechanical properties of the resulting nanocomposites. Then, these samples were mixed, milled with a high-energy ball mill, sintered at 700°C and subjected to X-ray diffraction (XRD) technique, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) to examine their structure, chemical composition and microstructure, respectively. Furthermore, the physical and mechanical properties of the sintered nanocomposites were also measured. Moreover, the in vitro bioactivity of the prepared nanocomposites was examined with XRD and SEM. Additionally, the antibacterial behavior of these samples was tested against E. coli and S. aureus by the disc-diffusion method. The results obtained pointed out that the sample with the highest content of BG possessed the best bioactivity, antibacterial effect, physical and mechanical properties.
The aim of this work is to prepare nanocomposites with excellent bioactivity and appropriate mechanical properties. In this regard, the nanocomposites, with different contents of borosilicate glass (BG) and carbonated hydroxyapatite (CHA), were mixed and milled using a high-energy ball mill. Then, these milled powders were subjected to sintering at 750 ºC. In order to examine their phase composition, molecular structure and microstructure, X-ray diffraction (XRD) technique, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM), respectively were used. Moreover, the DC electrical conductivity, and physical and mechanical properties of the prepared nanocomposites were also measured. In addition, the in vitro bioactivity of the sintered samples was evaluated using XRD and SEM. Unexpectedly; the results indicated that the successive increase in BG contents promoted the partial decomposition of CHA molecules at this lower sintering temperature. Also, it was responsible for the enhanced bioactivity behavior along with giving CHA better mechanical properties. However, the electrical conductivity of the examined samples exhibited an opposite trend where it decreased signi cantly with increasing BG content. According to the results obtained, the prepared samples are suitable for use in various biomedical applications.
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