Li Gen, Wang Keliang, Lu Chunjing
Department of Petroleum Engineering, Northeast Petroleum University, Daqing, China.
Key Laboratory of Enhanced Oil Recovery, Northeast Petroleum University, Ministry of Education, Daqing, China.
Front Chem. 2021 Jan 8;8:602424. doi: 10.3389/fchem.2020.602424. eCollection 2020.
Based on the Pickering emulsion template method, two types of Janus particles with different relative amphiphilic areas for stabilizing non-aqueous foam were synthesized. In addition, particles with uniformly modified surface were synthesized for comparison. By adjusting oil mixtures, the behavior of particles on the oil-air surface was measured. Moreover, the role of particle agglomerates in surface adsorption process was investigated. Affected by the particle surface contact angle, the surface activity of Janus particles is not always greater than that of uniformly modified particles, which is reflected on delta surface tension and the volume of foam generated. The oil-surface adsorption process of synthesized Janus particles is not only occurred in the form of independent detached particles, but also in the form of particle agglomerates. The adsorption of the particles from the bulk phase to the surface requires the contact angle of the Cassie-Baxter composite surface of the particle agglomerates to be around 90°, but the inherent contact angle of the individual particles is <90°.
基于皮克林乳液模板法，合成了两种具有不同相对亲油亲水平衡区域的用于稳定非水泡沫的Janus粒子。此外，还合成了表面均匀改性的粒子用于对比。通过调整油混合物，测量了粒子在油-气表面的行为。此外，还研究了粒子团聚体在表面吸附过程中的作用。受粒子表面接触角的影响，Janus粒子的表面活性并不总是大于表面均匀改性的粒子，这在表面张力增量和产生的泡沫体积上有所体现。合成的Janus粒子在油-表面的吸附过程不仅以独立分离粒子的形式发生，也以粒子团聚体的形式发生。粒子从本体相吸附到表面需要粒子团聚体的卡西-巴克斯特复合表面的接触角约为90°，但单个粒子的固有接触角小于90°。
