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$CO_{2}/N_{2}$ Responsive Pickering Emulsion Stabilized by Silica Nanoparticles and a Common Nonionic Surfactant
| Content Provider | Scilit |
|---|---|
| Author | Zhang, L. Zhang, G. Ge, J. Jiang, P. Pei, H. |
| Copyright Year | 2018 |
| Description | Journal: Iop Conference Series: Earth and Environmental Science Responsive emulsions with controllable stability are of growing interests in recent years. These emulsions are usually stabilized by specially synthesized surfactants, polymers, solid particles or their mixtures with switchable functional groups. However, these emulsifiers are inconvenient for extensive utilizations due to their complicated synthesis processes. Here we propose a new approach of using hydrophilic silica nanoparticles activated by a conventional polyoxyethylene nonionic surfactant to prepare responsive Pickering emulsions triggered by $CO_{2}/N_{2}$. The addition or removal of $CO_{2}$ is to simply change the amount of silanols on the particle surface, increasing or decreasing the adsorbing sites for hydrogen bonding with oxyethylene groups. The adsorption amount of the polyoxyethylene nonionic surfactant onto silica nanoparticles can be significantly increased when $CO_{2}$ is introduced, making the particles hydrophobized in situ and become excellent stabilizers for Pickering emulsions. While $N_{2}$ was bubbled at an elevated temperature to remove the dissolved $CO_{2}$, the substantial desorption of the surfactant from the particle surface can make silica nanoparticles regain their hydrophilic nature, and therefore emulsions stabilized by such particles can be broken. |
| Related Links | http://iopscience.iop.org/article/10.1088/1755-1315/186/2/012012/pdf |
| ISSN | 17551307 |
| e-ISSN | 17551315 |
| DOI | 10.1088/1755-1315/186/2/012012 |
| Journal | Iop Conference Series: Earth and Environmental Science |
| Issue Number | 2 |
| Volume Number | 186 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-10-11 |
| Access Restriction | Open |
| Subject Keyword | Journal: Iop Conference Series: Earth and Environmental Science Atomic, Molecular and Chemical Physics Silica Nanoparticles Stabilizers for Pickering Emulsions |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Physics and Astronomy Environmental Science |
