Abstract
Investigations were performed on silica precipitation from sodium metasilicate solution, using hydrochloric acid. Optimum composition of the emulsion and optimum parameters of precipitation were undertaken. Nonionic surfactants, polydisperse mono(4-nonylphenyl)polyoxyethylene glycol ethers, were used as emulsifiers. Basic physicochemical properties of the silicas were tested, including their zeta potential, particle shape and morphology, particle size and polydispersity. Moreover, specific surface area (BET) and pore volume were estimated. The obtained silicas demonstrated low bulk density (60 to 100 g/dm 3) and high paraffin oil absorbing capacity (750 to 1100 cm 3/100 g). Depending upon the techniques applied in the course of precipitation (high rate stirring, homogenization, ultrasounds), the obtained silicas manifested an ideally spherical shape of particles mainly when such surfactants as Rokafenols n−5 and n−6 were applied. When homogenizer was used, the spherical particles proved to be highly uniform in size and they practically showed no tendency to form agglomerates. Moreover, the obtained silicas demonstrated a relatively high specific surface area, ranging between 120 and 260 m 2/g.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
