A high performance magnetically responsive Janus nano-emulsifier: Preparation, emulsification characteristics, interfacial rheology, and application in emulsion flooding

作者：Lei Yue, W. Pu, Tianhong Zhao, Zhuang Jian, Shuai Zhao · 发表于：Journal of Petroleum Science and Engineering · 年份：2022 · DOI：10.1016/j.petrol.2021.109478 · 被引用次数：48 · 研究领域：Materials Science

Abstract Recently magnetic nanomaterial has become a research hotspot in many areas due to its environment friendly, low-toxicity, magnetic responsiveness, and excellent reusability. This paper aims to study a novel amphipathic Janus magnetic -nanoparticle (MJNP) applied for emulsion flooding, including preparation, emulsification characteristics, interface rheology, and enhanced oil recovery performance. X-ray diffraction (XRD), Fourier transform Infrared spectrometer (FT-IR), Transmission electron microscopy (TEM), Scanning electron microscope (SEM), Thermal gravimetric analyzer (TGA), and vibrating sample magnetometer (VSM) are employed to observe the crystal structure, shape, size, surface components of Janus nanoparticle, and magnetic responsiveness. Results show this high performance MJNP fabricated by Pickering emulsion method has coupled carboxyl and octyl chemical groups on both ends of its surface. What's more, MJNPs have not only sufficiently small particle size for ensuring free flow in reservoir but outstanding magnetic responsiveness for efficient reusability. This hydrophilic MJNP owns excellent emulsion performance to prepare high internal phase O/W emulsion without any additive. Results show 0.3% of MJNP has prepared stable O/W emulsion with 90% of oil content, and 80% emulsion is even stabilized by 0.02% of MJNP and fails to phase inversion. Furthermore, these emulsions fabricated by higher concentration of MJNP own finer stability and anti-temperature. The ...