磁响应的海藻酸钙微球稳定油包水型Pickering乳液研究

Study on water-in-oil Pickering emulsion stabilized by magnetic responsive calcium alginate microspheres

通过乳液凝胶法制备了内部包封四氧化三铁纳米颗粒的海藻酸钙微球,该微球表面包覆疏水改性的二氧化钛纳米颗粒,在正己烷中分散良好。由于有烷基硅烷改性二氧化钛纳米颗粒的包覆,使得海藻酸钙微球能够用于稳定油包水型的Pickering乳液。通过微球含量的优化,调控了Pickering乳液的粒径大小。在外界磁场作用下,微球稳定的Pickering乳液能定向移动并实现磁响应破乳分离。

Calcium alginate microspheres internally encapsulated with Fe3O4 nanoparticles were prepared by emulsion gel method.The surface of the microspheres was coated with hydrophobically modified titanium dioxide nanoparticles and dispersed well in hexane.Due to the coating of alkyl silane-modified titanium dioxide nanoparticles,calcium alginate microspheres can be used to stabilize the water-in-oil Pickering emulsion.By optimizing the calcium alginate microsphere content,the particle size of Pickering emulsion can be adjusted.Additionally,the microsphere-stabilized Pickering emulsion can be oriented and magnetically demulsified under the action of an external magnetic field.