The adsorption of polyoxyethylated nonylphenol on calcium carbonate in aqueous solution

Theoretical estimation of stability ratios for hexadecane-in-water (H/W) emulsions stabilized with nonylphenol ethoxylated surfactants

“…Using an AcoustoSizer, Kong et al [35,36] The adsorption nonyl ethoxylates (NEm) [37][38][39][40] on solid surfaces (carbon black, CaCO 3 , and graphon) evidenced that these surfactants present Langmuirian adsorption isotherms [41]. The extent of the adsorption of small oligomers (m = 3-9), increases with the length of the alkyl chain at constant m, but decreases with the length of the ethylene oxide at constant alkyl chain.…”

Adsorption of 2,4-Dichlorophenol on Montmorillonite and Silica: Influence of Nonionic Surfactants

“…These studies reveal that the interaction of nonionic surfactants of the polyether type with polar surfaces mainly takes place through the polar ether chain (11,12). The increase of the ethoxy (EO) number leads to a reduction of the plateau value of the isotherms (13)(14)(15). With increasing length of the nonpolar alkyl chain, the increase of the isotherms is shifted to ever-lower equilibrium concentrations (16).…”

Effect of Nonionic Surfactants on Aqueous Primidone Suspensions

“…For primidone dissolved in water, the absorbance is directly proportional to its concentration. For the concentration expressed in percent (w/w), the regression line (n = 5), obtained with a 1.00-cm cell, is: A257,pri = 11.41 Cpri (5) and the RSD of the slope is 3.7%. The primidone concentrations determined in the presence of octoxynol9 are only approximate values because they were obtained from the differences between two absorbances and because the maximum at 257 nm is a small peak located on the shoulder of the more intense 275.5 nm band of octoxynol 9.…”