Particle contact angle at the oil–water interface: Effect of surface silanization--颗粒学报PARTICUOLOGY

Wang, K., Wang, G., & Lu, C. (2019). Particle contact angle at the oil–water interface: Effect of surface silanization. Particuology, 44, 218-224. https://doi.org/10.1016/j.partic.2018.05.011

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

Keliang Wang, Gang Wang ^*, Chunjing Lu

Key Laboratory of Enhanced Oil Recovery of Ministry Education, Northeast Petroleum University, Daqing 163000, China

10.1016/j.partic.2018.05.011

Volume 44, June 2019, Pages 218-224

Received 3 July 2017, Revised 13 October 2017, Accepted 22 May 2018, Available online 3 January 2019, Version of Record 30 April 2019.

E-mail: g.wang@stu.nepu.edu.cn

Highlights

• A novel method was developed for varying the contact angle of particles by surface silanization.

• Increasing the APTES grafting density resulted in a three-phase contact angle increase.

• Fluorinated Janus particles were prepared by modified silica particles adsorbed on the wax surface.

Abstract

A novel and efficient method was developed to vary the particle contact angle (θ) at the wax–water interface by tailoring the degree of ϒ-aminopropyltriethoxysilane (APTES) grafting onto silica particles. The three-phase θ determines the degree of particle penetration into the respective phases. Increasing the APTES grafting density of the silica particles resulted in a three-phase θ 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.

Graphical abstract

Keywords

Janus particles; Surface modification; Aminopropyltriethoxysilane; Pickering emulsions; Contact angle

文章导读