Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Nanotechnology. 2011 Jul 1;22(26):265610. doi: 10.1088/0957-4484/22/26/265610. Epub 2011 May 17.
We report on the formation of hollow MgO particles by excimer laser ablation of bulk Mg in water and aqueous solutions of sodium dodecyl sulfate (SDS) and sodium citrate (SC). Lamellar nanostructures of Mg(OH)(2) also formed in water, but the formation could be avoided by the addition of SDS or SC. Laser ablation produced not only Mg species that were oxidized into MgO and Mg(OH)(2) in water, but also cavitation bubbles. The bubble interfaces trapped the MgO nanoparticles to decrease the surface free energy of the system, finally resulting in hollow particles.
我们报告了通过准分子激光烧蚀块状 Mg 在水中和十二烷基硫酸钠（SDS）和柠檬酸钠（SC）水溶液中形成空心 MgO 颗粒的情况。在水中也形成了层状纳米结构的 Mg(OH)(2)，但通过添加 SDS 或 SC 可以避免其形成。激光烧蚀不仅产生了在水中被氧化成 MgO 和 Mg(OH)(2)的 Mg 物种，还产生了空化气泡。气泡界面捕获了 MgO 纳米颗粒，降低了体系的表面自由能，最终导致形成了空心颗粒。
