Zhang Meng, Wen Yutong, Deng Quanhua, Xue Chunlong, Ji Deluo, Gong Weiqian, Li Ying
Key Laboratory of Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100, China.
ACS Appl Mater Interfaces. 2024 Oct 23;16(42):56935-56946. doi: 10.1021/acsami.4c07918. Epub 2024 Oct 11.
Lignin, a widely available, cost-effective, and structurally stable natural polymer, has recently attracted significant attention due to its diverse potential applications. A promising approach is to prepare lignin nanoparticles (LNPs) as a substitute for conventional nanoparticles to fulfill a variety of functions. In this study, LNPs with controlled size, regular morphology, and excellent dispersibility were synthesized by using industrial alkali lignin. The antisolvent method was employed, utilizing an aqueous solution of the anionic surfactant sodium apolyolefin sulfonate (AOS) as the antisolvent. Subsequently, the prepared LNPs were used to formulate nanofluids in combination with AOS and nonionic surfactant coconut diethanolamide (CDEA). The incorporation of LNPs has significantly enhanced the interfacial activity of the resulting nanofluids, thereby improving their emulsion stabilization, spreading on quartz surfaces, and oil droplet removal capabilities, which establish a strong foundation for the AOS/CDEA/LNPs nanofluid to achieve high performance in enhanced oil recovery (EOR), which was validated through microscopic visual physical model experiments. The quartz crystal microbalance with the dissipation monitoring (QCM-D) technique was employed to investigate the adsorption of surfactants onto quartz surfaces. It was found that the incorporation of LNPs significantly reduces the adsorption loss of surfactants, presenting a potential solution to overcome the challenges associated with surfactant adsorption in chemically enhanced oil recovery (EOR) processes, such as high cost and unreliable efficiency. This study reveals the good performance of LNPs/surfactant nanofluids and provides a potential approach to the advancement of green, sustainable, and intelligent EOR technologies.
木质素是一种广泛可得、成本效益高且结构稳定的天然聚合物，由于其多样的潜在应用，近年来受到了广泛关注。一种很有前景的方法是制备木质素纳米颗粒（LNPs），以替代传统纳米颗粒来实现多种功能。在本研究中，利用工业碱木质素合成了尺寸可控、形态规则且分散性优异的LNPs。采用反溶剂法，使用阴离子表面活性剂聚烯烃磺酸钠（AOS）的水溶液作为反溶剂。随后，将制备的LNPs与AOS和非离子表面活性剂椰油二乙醇酰胺（CDEA）结合用于配制纳米流体。LNPs的加入显著提高了所得纳米流体的界面活性，从而改善了它们的乳液稳定性、在石英表面的铺展性以及油滴去除能力，这为AOS/CDEA/LNPs纳米流体在提高采收率（EOR）方面实现高性能奠定了坚实基础，通过微观可视化物理模型实验得到了验证。采用具有耗散监测功能的石英晶体微天平（QCM-D）技术研究了表面活性剂在石英表面的吸附情况。结果发现，LNPs的加入显著降低了表面活性剂的吸附损失，为克服化学强化采油（EOR）过程中与表面活性剂吸附相关的挑战（如成本高和效率不可靠）提供了一种潜在解决方案。本研究揭示了LNPs/表面活性剂纳米流体的良好性能，并为绿色、可持续和智能EOR技术的发展提供了一种潜在途径。
