Zeta potential in nonaqueous media and its effect on dispersion stability

Direct Measurement of Surface Forces Due to Charging of Solids Immersed in a Nonpolar Liquid

“…Figure a illustrates the effect of the dielectric constant of the medium on the ionic concentration for a number of electrolyte concentrations with an ionic diameter of 0.5 nm. The ionic concentration plunges as the dielectric constant reaches the nonpolar region, that is, c i < ∼10 -9 mol/L, which is comparable to that reported in the literature. ,, The dissociation becomes almost saturated as ε r exceeds around 13, which compares well with van der Hoeven and Lyklema's definition 16 that a polar liquid has ε r greater than 11. In addition, as the electrolyte concentration increases, the degree of dissociation decreases although the eventual ionic concentration is higher.…”

Direct Measurement of Surface Forces Due to Charging of Solids Immersed in a Nonpolar Liquid

“…Figure a illustrates the effect of the dielectric constant of the medium on the ionic concentration for a number of electrolyte concentrations with an ionic diameter of 0.5 nm. The ionic concentration plunges as the dielectric constant reaches the nonpolar region, that is, c i < ∼10 -9 mol/L, which is comparable to that reported in the literature. ,, The dissociation becomes almost saturated as ε r exceeds around 13, which compares well with van der Hoeven and Lyklema's definition 16 that a polar liquid has ε r greater than 11. In addition, as the electrolyte concentration increases, the degree of dissociation decreases although the eventual ionic concentration is higher.…”

Exploring the charging mechanisms in non-aqueous multiphase surfactant solutions, emulsions and colloidal systems via conductivity behaviors predicted with eyring's rate process theory

“…Comparing the processes expressed in eqn (42) with eqn (43), one may easily reach the conclusion that eqn (43) may predict a similar conductivity behavior, as shown in eqn (38) and (23). However, the equilibrium constant K eq should be changed, as it is now a function of the applied electric field strength and the resulted conductivity should be different, too.…”

Preparation and In Vitro/In Vivo Evaluation of Cyclosporin A-Loaded Nanodecorated Ocular Implants for Subconjunctival Application

“…All the formulations showed negative surface charge as it is expected with zeta potential values between −16.3 ± 1.5 and −22.4 ± 4.1, and results indicated that the charge was increased with drug loading. The enhancement of zeta potential values with the addition of the drug might indicate that the stability of the system was also improved in the presence of drug …”

Direct Measurement of Surface Forces Due to Charging of Solids Immersed in a Nonpolar Liquid

“…Figure a illustrates the effect of the dielectric constant of the medium on the ionic concentration for a number of electrolyte concentrations with an ionic diameter of 0.5 nm. The ionic concentration plunges as the dielectric constant reaches the nonpolar region, that is, c i < ∼10 -9 mol/L, which is comparable to that reported in the literature. ,, The dissociation becomes almost saturated as ε r exceeds around 13, which compares well with van der Hoeven and Lyklema's definition 16 that a polar liquid has ε r greater than 11. In addition, as the electrolyte concentration increases, the degree of dissociation decreases although the eventual ionic concentration is higher.…”

Exploring the charging mechanisms in non-aqueous multiphase surfactant solutions, emulsions and colloidal systems via conductivity behaviors predicted with eyring's rate process theory

“…Comparing the processes expressed in eqn (42) with eqn (43), one may easily reach the conclusion that eqn (43) may predict a similar conductivity behavior, as shown in eqn (38) and (23). However, the equilibrium constant K eq should be changed, as it is now a function of the applied electric field strength and the resulted conductivity should be different, too.…”

Preparation and In Vitro/In Vivo Evaluation of Cyclosporin A-Loaded Nanodecorated Ocular Implants for Subconjunctival Application

“…All the formulations showed negative surface charge as it is expected with zeta potential values between −16.3 ± 1.5 and −22.4 ± 4.1, and results indicated that the charge was increased with drug loading. The enhancement of zeta potential values with the addition of the drug might indicate that the stability of the system was also improved in the presence of drug …”

Direct Measurement of Surface Forces Due to Charging of Solids Immersed in a Nonpolar Liquid

“…Figure a illustrates the effect of the dielectric constant of the medium on the ionic concentration for a number of electrolyte concentrations with an ionic diameter of 0.5 nm. The ionic concentration plunges as the dielectric constant reaches the nonpolar region, that is, c i < ∼10 -9 mol/L, which is comparable to that reported in the literature. ,, The dissociation becomes almost saturated as ε r exceeds around 13, which compares well with van der Hoeven and Lyklema's definition 16 that a polar liquid has ε r greater than 11. In addition, as the electrolyte concentration increases, the degree of dissociation decreases although the eventual ionic concentration is higher.…”

Exploring the charging mechanisms in non-aqueous multiphase surfactant solutions, emulsions and colloidal systems via conductivity behaviors predicted with eyring's rate process theory

“…Comparing the processes expressed in eqn (42) with eqn (43), one may easily reach the conclusion that eqn (43) may predict a similar conductivity behavior, as shown in eqn (38) and (23). However, the equilibrium constant K eq should be changed, as it is now a function of the applied electric field strength and the resulted conductivity should be different, too.…”

Preparation and In Vitro/In Vivo Evaluation of Cyclosporin A-Loaded Nanodecorated Ocular Implants for Subconjunctival Application

“…All the formulations showed negative surface charge as it is expected with zeta potential values between −16.3 ± 1.5 and −22.4 ± 4.1, and results indicated that the charge was increased with drug loading. The enhancement of zeta potential values with the addition of the drug might indicate that the stability of the system was also improved in the presence of drug …”