Influence of Nonionic Rosin Surfactants on Surface Activity of Silica Particles and Stability of Oil in Water Emulsions

Abstract

Rosin as a natural product has become a source for production of less toxic bio‐surfactants to produce emulsions which are widely used in various agriculture and food products, cosmetic, and pharmaceutical industries. In this respect, a nonionic surfactant was prepared from reaction of rosin acids and rosin maleic anhydride adduct with poly(ethylene glycol) monomethyl ether 750 (MPEG 750) to produce a rosin ester (RMPEG 750). The surface activity parameters of the prepared surfactants, such as surface excess concentration (Γmax), the area per molecule at interface (Amin), and the effectiveness of surface tension reduction, were measured to determine the micellization and adsorption characteristics of the prepared surfactants at the water/air interface. The adsorption of the prepared surfactants on the surface of either hydrophilic or hydrophobic silica particles was determined using a spectrophotometric method. Interfacial tension between water and toluene were measured to select the best condition to obtain toluene/water emulsion in the presence of modified solid silica particles. The effects of silica particle hydrophilicity and the surfactant concentrations on the surface, interfacial activity, and on the emulsion drop size were also investigated.

Application of Super-Amphiphilic Silica-Nanogel Composites for Fast Removal of Water Pollutants

“…For this reason, ionic liquids have been used as solvent and capping agent to activate the surface properties of silica to remove water pollutants [27]. In our previous work, the silica nanoparticles were activated with bio-based surfactants, based on rosin, to enhance their surface activity [28]. In this respect, nanogels based on ionic and nonionic monomers were selected to coat the silica surfaces to prepare novel water-based amphiphilic silica nanoparticles.…”

“…In the previous work [28], the surface activity of silica was modified by using nonionic surfactants and the water surface tension was reduced from 72.1 mN/m to 32 mN/m due to adsorption of surfactants on the silica nanoparticles. In the present work, surface of silica nanoparticles was modified with ionic and nonionic nanogels to reduce the water surface tension to facilitate the diffusion of organic or inorganic pollutants from water to the silica-nanogel composites.…”

Mixed Systems Based on Erucyl Amidopropyl Betaine and Nanoparticles: Self‐Organization and Rheology

“…Both electrostatic forces and hydrophobic effect can mediate surfactant-nanoparticles interactions. A survey of the literature revealed that the balance between the two mechanisms depends strongly on the particle charge and the nature of surfactant head group [38][39][40][41][42]. In the case of like charged partners, hydrophobic effects prevail, whereas, when oppositely charged nanoparticles and surfactants interact, electrostatic forces play a key role.…”

Interaction of biocompatible natural rosin-based surfactants with human serum albumin: A biophysical study

“…2596) were synthesized as described in the previous work [39,40]. The compunds were of high purity as these were recrystallize many times and the FTIR and NMR spectra along with surface tension measuremets suggest that the compounds were free from any impurity [41][42][43][44]. The chemical structures and scheme of synthesis of all three surfactants is illustrated in the Fig.…”