School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Adv Colloid Interface Sci. 2017 Aug;246:105-132. doi: 10.1016/j.cis.2017.05.019. Epub 2017 May 31.
Bubble-particle interaction is of great theoretical and practical importance in flotation. Significant progress has been achieved over the past years and the process of bubble-particle collision is reasonably well understood. This, however, is not the case for bubble-particle attachment leading to three-phase contact line formation due to the difficulty in both theoretical analysis and experimental verification. For attachment, surface forces play a major role. They control the thinning and rupture of the liquid film between the bubble and the particle. The coupling between force, bubble deformation and film drainage is critical to understand the underlying mechanism responsible for bubble-particle attachment. In this review we first discuss the advances in macroscopic experimental methods for characterizing bubble-particle attachment such as induction timer and high speed visualization. Then we focus on advances in measuring the force and drainage of thin liquid films between an air bubble and a solid surface at a nanometer scale. Advances, limits, challenges, and future research opportunities are discussed. By combining atomic force microscopy and reflection interference contrast microscopy, the force, bubble deformation, and liquid film drainage can be measured simultaneously. The simultaneous measurement of the interaction force and the spatiotemporal evolution of the confined liquid film hold great promise to shed new light on flotation.
气泡-颗粒相互作用在浮选过程中具有重要的理论和实际意义。在过去的几年中，已经取得了重大进展，并且对气泡-颗粒碰撞过程有了相当好的理解。然而，导致三相接触线形成的气泡-颗粒附着情况并非如此，这是因为理论分析和实验验证都存在困难。对于附着，表面力起着重要作用。它们控制着气泡和颗粒之间的液膜变薄和破裂。力、气泡变形和膜排水之间的耦合对于理解导致气泡-颗粒附着的潜在机制至关重要。在这篇综述中，我们首先讨论了用于表征气泡-颗粒附着的宏观实验方法的进展，例如诱导定时器和高速可视化。然后，我们重点介绍了在纳米尺度上测量气泡和固体表面之间薄液膜的力和排水的进展。讨论了进展、限制、挑战和未来的研究机会。通过原子力显微镜和反射干涉对比显微镜的结合，可以同时测量力、气泡变形和液体膜排水。同时测量相互作用力和受限液体膜的时空演化有望为浮选提供新的见解。
