The Impact of Zeta Potential and Physicochemical Properties of TiO₂‐Based Nanocomposites on Their Biological Activity

Abstract

The aim of this research was to observe the relationship between zeta potential, morphology, surface area, porosity, chemical composition, and ecotoxicity of nanocomposite powders such as were exhibiting good antimicrobial properties. It was observed, that nanomaterials characterized by similar morphology and zeta potential revealed the similar toxic behavior. The samples of higher agglomeration and higher zeta potential, especially Ag/TiO 2 /SiO 2 xerogel and TiO 2 /SiO 2 aerogel were generally less ecotoxic to water organisms and plants. They were also not genotoxic in concentrations up to 500 and 250 mg/L, respectively.where g = 8.90 9 10 À4 [Pa s] is the viscosity of the electrolyte solution (water at 25°C), l is the particle velocity [m/s], and e 0 = 8.85 [pF/m] is the vacuum permittivity, e r = 78.54 is the relative permittivity of the *agsolgala@gmail.com

The toxicity in vitro of titanium dioxide nanoparticles modified with noble metals on mammalian cells

“…It should be noted that nanometal oxides and metallic nanoparticles reveal the synergic effect with ceramic nanoparticles such as TiO 2 and Al 2 O 3 . The effect is to strengthen the biological or catalytic activity of the nanoparticles but also may extinguish or reduce this activity . In our opinion, high cytotoxicity of TiO 2 nanoparticles doped with Ag is the result of a synergic effect between Ag + ions and TiO 2 nanoparticles strengthening the cytotoxic activity.…”

“…As can be seen, still, it is very little known on the cytotoxicity of TiO 2 nanoparticles modified with various noble metals in the nanocomposite form. This is mainly due to the fact that the TiO 2 ‐based nanocomposite particles analyzed for toxicity were prepared using different methods and techniques . In other studies, the nanocomposite systems were not synthesized and the TiO 2 nanoparticles were compared to separately prepared other types of nanoparticles .…”

Biological Activity and Bio-Sorption Properties of the Ti2C Studied by Means of Zeta Potential and SEM

“…Such an analysis is very useful when there is a need for information on how the adsorption of bacteria cells changes the stability of a suspension and how much it influences the electrical charge formed on the surface of the analysed material or bacteria cells [7,9,10]. The methodology used for zeta potential investigations was similar to our previous reports [7,11]. It should be also noted, that the Ti 2 AlC was used as a reference only for the purpose of comparison of zeta potential of pure suspensions.…”

Influence of modification of Ti3C2 MXene with ceramic oxide and noble metal nanoparticles on its antimicrobial properties and ecotoxicity towards selected algae and higher plants

“…TiO 2 /M nanocomposites changes toxicity of the material. 34 Additionally, changing TiO 2 to Al 2 O 3 , SiO 2 or ZnO 2 in the Me x O y /Ag can shi the toxicity from one particular bacteria strain towards another.…”