Synthesis and characterization of the NiFe2O4@TEOS–TPS@Ag nanocomposite and investigation of its antibacterial activity

Abstract

In this study, the NiFe 2 O 4 was embedded in (3-mercaptopropyl) trimethoxysilane (TPS) and tetraethyl orthosilicate (TEOS) using the sol-gel method. These compounds were used as the support of Ag nanoparticles (Ag NPs). The NiFe 2 O 4 @TEOS-TPS@Ag nanocomposites were obtained with the development of bonding between the silver atoms of Ag NPs and the sulfur atoms of TPS molecule. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used for the characterization of the Ag nanocomposites. Also, the magnetic properties of these nanocomposites were studied by using a vibrating sample magnetometer (VSM) technique. The disk diffusion, minimum inhibition concentration (MIC) and minimum bactericidal concentrations (MBC) tests were used for the investigation of the antibacterial effect of this nanocomposite against bacterial strains. The synthesized nanocomposite presented high reusability and good antibacterial activity against gram-positive and gram-negative bacteria. Remarkably, this nanocomposite could be easily removed from the disinfected media by magnetic decantation.

Synthesis and characterisation of Fe 3 O 4 at MPTMS at Au nanocomposite by sol–gel method for the removal of methylene blue

“…In all three samples, a strong band in the low‐frequency region is found to be about 579 cm −1 , which is related to the vibration of the Fe–O bonds in iron oxide, this vibration along with strong absorption about 585 and 632 cm −1 confirms the presence of Fe 3 O 4 nanoparticles [22]. In all samples, a broadband absorption is appeared at about 3421 cm −1 , which is related to the presence of elastic vibration of the hydroxyl O–H group in iron oxide [23]. As it is shown in Fig.…”

Preparation of amino silane magnetic nanocomposite by the sol–gel process and investigation of its antibacterial activity

“…Sol turns into a gel in this process, often by changing the pH or the concentration of the solution [17, 18]. The advantages of this method are high purity, narrow particle size distribution, and a homogeneous nanostructure at a low temperature [11]. This method has better compositional homogeneity, resulting in the better absorption of NPs, easy control, and lower cost, as compared with others [19].…”

“…The use of an appropriate substrate for the adsorption of AgNPs can reduce the number of NPs and enhance the antibacterial efficacy needed; so, the use of the polymer is a viable option [9][10][11]. On the basis of the studies conducted, Ag-silica compound could be stable at high temperatures and useful for the antibacterial field [12,13].…”

Characterisation and investigation of antibacterial properties of nylon 66/TPS/Ag NPs nanofibre membranes

“…The immobilisation of Ag NPs on the supporting agents has solved this problem to a certain extent. The general supporting agents used are polymers [7, 8], chitosan [9], zeolite [10] and particularly nanoferrites [11].…”

“…Using nanoferrite materials has some advantages such as convenient immobilisation of Ag NPs and their separation from media by the application an external magnetic field after disinfection process [8, 12]. However, application of magnetic field with very high potential is not applicable at an industrial scale, for example, in water treatment of rivers and in some cases like treatment of bactericidal wounds.…”