Ge Xue-Hui, Huang Jin-Pei, Xu Jian-Hong, Chen Jian, Luo Guang-Sheng
The State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Soft Matter. 2016 Apr 14;12(14):3425-30. doi: 10.1039/c6sm00130k. Epub 2016 Mar 7.
In this work we developed a facile method to prepare water-oil Janus emulsions in situ with tunable morphologies by using a double-bore capillary microfluidic device. In addition, by combining the theory model and our liquids' properties, we propose a method to design the morphology of water-oil Janus emulsions. To systematically research Janus morphologies we combined the theory model and the fluids' properties. Under the model guidance, we carefully selected the liquids system where only the interfacial tension between the water phase and the continuous phase changed while keeping the other two interfacial tensions unchanged. Thus we could adjust the Janus morphology by changing the surfactant mass fraction in the continuous phase. In addition, with the double-bore capillary, we prepared water-oil Janus emulsions with a large flow ratio range. By adjusting the flow ratio and the surfactant mass fraction, we successfully prepared Janus emulsions with gradual morphology changes, which would be meaningful in fields that have a high demand for morphology designing of amphiphilic Janus particles.
在这项工作中，我们开发了一种简便的方法，通过使用双孔毛细管微流控装置原位制备形态可调的水-油双面乳液。此外，通过结合理论模型和我们所使用液体的性质，我们提出了一种设计水-油双面乳液形态的方法。为了系统地研究双面形态，我们将理论模型与流体性质相结合。在模型指导下，我们精心选择了液体体系，其中仅水相和连续相之间的界面张力发生变化，而其他两个界面张力保持不变。因此，我们可以通过改变连续相中表面活性剂的质量分数来调整双面形态。此外，利用双孔毛细管，我们制备了具有大流量比范围的水-油双面乳液。通过调节流量比和表面活性剂质量分数，我们成功制备了形态逐渐变化的双面乳液，这在对两亲性双面颗粒形态设计有高要求的领域中将具有重要意义。
