Department of Chemical & Biomolecular Engineering, North Carolina State University, Raleigh, 27695-7905, United States.
J Am Chem Soc. 2011 Sep 7;133(35):13856-9. doi: 10.1021/ja205065w. Epub 2011 Aug 16.
We introduce a new class of Pickering foams which can be manipulated using a magnetic field. These foams are stabilized by a mixture of magnetic and nonmagnetic particles. They exhibit excellent stability in the absence of a magnetic field, but can be rapidly destroyed on demand with the application of a threshold field. We characterize their stability in the absence of a magnetic field by measuring the rate of water drainage from the foam as a function of time. We also correlate their collapse behavior under a magnetic field to the foam liquid fraction, as well as the concentration of magnetic particles in the foam. This novel system can be used to study the properties of Pickering foams, and has potential applications in noncontact defoaming processes.
我们介绍了一类新的 Pickering 泡沫，它可以通过磁场进行操作。这些泡沫由磁性和非磁性颗粒的混合物稳定。在没有磁场的情况下，它们表现出极好的稳定性，但可以通过施加阈值磁场来快速按需破坏。我们通过测量泡沫中水随时间的排水速率来表征其在无磁场时的稳定性。我们还将磁场下的泡沫坍塌行为与泡沫的液体分数以及泡沫中磁性颗粒的浓度相关联。这种新型系统可用于研究 Pickering 泡沫的性质，并在非接触消泡过程中具有潜在的应用。
