Subramaniam Anand Bala, Gregory Donald, Petkov Jordan, Stone Howard A
School of Engineering and Applied Sciences, Harvard University, Pierce Hall, 29 Oxford Street, Cambridge, Massachusetts 02138, USA.
Phys Chem Chem Phys. 2007 Dec 28;9(48):6476-81. doi: 10.1039/b712172e. Epub 2007 Nov 15.
We find that the gas phases of air bubbles covered with anionic or cationic polystyrene latex particles dissolve on exposure to cationic and catanionic surfactants. The particles on the bubble interface are released as singlets or aggregates when the surfactant has a single hydrophobic chain, while porous colloidal capsules (colloidosomes) with the same aqueous phase inside as out are obtained when the surfactant has two hydrophobic chains. The formation of colloidosomes from the particle-covered bubbles does not appear to depend significantly on the charge of the particles, which makes it unlikely that bilayers of surfactant are stabilizing the colloidosome. While the exact mechanism of formation remains an open question, our method is a simple one-step process for obtaining colloidosomes from particle-covered bubbles.
我们发现，覆盖有阴离子或阳离子聚苯乙烯乳胶颗粒的气泡气相在暴露于阳离子和阴阳离子表面活性剂时会溶解。当表面活性剂具有单一疏水链时，气泡界面上的颗粒以单颗粒或聚集体形式释放，而当表面活性剂具有两条疏水链时，则会得到内部和外部水相相同的多孔胶体胶囊（胶体囊泡）。由颗粒覆盖的气泡形成胶体囊泡似乎与颗粒电荷没有显著关系，这使得表面活性剂双层稳定胶体囊泡的可能性不大。虽然确切的形成机制仍然是一个悬而未决的问题，但我们的方法是一种从颗粒覆盖的气泡中获得胶体囊泡的简单一步法。
