Zeta Potential Studies of Titanium Dioxide and Silver Nanoparticle Composites in Water-Based Colloidal Suspension

Abstract

We determine the zeta potential (ZP) by using electrophoretic laser light scattering and Laser Doppler Velocimetry (LDV). Particle sizes are measured by photon correlation spectroscopy (PCS). We studied the ZP for colloidal suspensions of TiO2 and Ag metal particles in order to determine the kinetic interaction and charge exchange between the particles. We investigated the natural tendency of the particles for aggregation and varied the pH of the solution. It was found that the ZP versus pH curve for the mixed TiO2/Ag did not behave as the average of the individual TiO2 and Ag curves as one would expect, and instead there was a slight horizontal shift towards higher pH values which implies that the particles in the mixed TiO2/Ag colloid are interacting with the result of charge exchange. The average particle size was measured in terms of effective diameter, for the TiO2, Ag and the mixed TiO2/Ag particles. The results indicated an increase of approximately 100 nm in the effective diameter of the mixed TiO2/Ag particles size compared to the size of the individual TiO2 particles. This can be explained as the fact that 50 nm Ag particles are adsorbed on the surface of the TiO2 particles.

Optimization of methacrylated gelatin /layered double hydroxides nanocomposite cell‐laden hydrogel bioinks with high printability for 3D extrusion bioprinting

“…The size of synthesized LDHs was found to be 78.33 ± 31.15 nm and the PDI value of 0.210 ( Figure 2D ) . The zeta potential of LDHs was measured as +25.6 ± 6.19 mV indicating physical stability of nanoparticles 79 . Based on TEM analysis, the particle size of LDHs was around 55–105 nm in a consistency with DLS results ( Figure 2E ).…”

“…The zeta potential of LDHs was measured as +25.6 ± 6.19 mV indicating physical stability of nanoparticles. 79 Based on TEM analysis, the particle size of LDHs was around 55-105 nm in a consistency with DLS results (Figure 2E).…”