Effect of Particle Aggregates on the Surface Properties of Amphiphilic SiO2 Particles in Anhydrous Foam†

doi:10.7503/cjcu20200296

Abstract

Abstract:

Two types of Janus particles with different relative amphiphilic areas for the preparation of non-aqueous foam were synthesized. In addition, particles with uniformly modified surfaces were synthesized as contrasts. By adjusting the properties of the oil mixture, the behavior of the particles on the oil and gas surface was measured and compared, and the role of the particle agglomerates in particles adsorption was studied. Affected by the contact angle of the particle surface, the surface activity of Janus particles is not always greater than that of the uniformly modified particles, which is reflected in the surface tension reduction ability and the volume of foam generated. The particles are not adsorbed from the bulk phase to the surface in the form of mutually independent particles, but in the state of particle agglomerates. And the contact angle of the Cassie-Baxter composite surface requiring particle agglomeration is around 90°, while the intrinsic contact angle of the particles is less than 70.1°.

Key words: Nanoparticles, Non-aqueous phase, Surface, Agglomeration, Contact angle

CLC Number:

O647.2

TrendMD:

LI Gen, WANG Keliang, LU Chunjing. Effect of Particle Aggregates on the Surface Properties of Amphiphilic SiO₂ Particles in Anhydrous Foam^†[J]. Chem. J. Chinese Universities, 2020, 41(9): 2038.

Figures/Tables 9

References 25

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Effect of Particle Aggregates on the Surface Properties of Amphiphilic SiO₂ Particles in Anhydrous Foam^†

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