Particle contact angle at the oil-water interface: Effect of surface silanization

A novel and efficient method was developed to vary the particle contact angle (9) at the wax-water interface by tailoring the degree of T-aminopropyltriethoxysilane (APTES) grafting onto silica particles. The three-phase 8 determines the degree of particle penetration into the respective phases. Increasing the APTES grafting density of the silica particles resulted in a three-phase 0 increase from 22 to 70. Furthermore, increasing APTES grafting density results in silica particles packing more closely and orderly on the surface of the wax colloidosomes. A series of fluorinated Janus particles were prepared by the subsequent surface chemical modification of the modified silica particles adsorbed on the wax surface. Silica particles with tailored APTES grafting densities can be utilized to tune the Janus balance during the synthesis of Janus particles based on Pickering emulsion methods. (C) 2018 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.