State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, PR China.
ACS Appl Mater Interfaces. 2013 Aug 28;5(16):7974-82. doi: 10.1021/am4020549. Epub 2013 Jul 30.
Macroporous polymer-graphene oxide (GO) composites were successfully prepared using Pickering high internal phase emulsion (HIPE) templates. GO flakes were modified by the cationic surfactant cetyltrimethylammonium bromide (CTAB) and used as the stabilizer of water-in-oil (W/O) Pickering emulsions. CTAB-modified GO is effective at stabilizing W/O Pickering HIPEs, and the lowest GO content is only about 0.2 mg mL(-1) (relative to the volume of the oil phase). The close-cell morphology of the resulting poly-Pickering HIPEs is observed, and the void size of the porous polymers is tuned by varying the concentration of GO. Three-dimensional macroporous chemically modified graphene (CMG) monoliths with a high specific surface area of about 490 m(2) g(-1) were obtained after removing the cellular polymer substrates through calcination. The micropores were also found in CMGs, which may be caused by the decomposition of CTAB adsorbed on the surface of GO.
采用 Pickering 高内相乳液（HIPE）模板成功制备了大孔聚合物-氧化石墨烯（GO）复合材料。GO 薄片通过阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）进行改性，并用作油包水（W/O）Pickering 乳液的稳定剂。CTAB 改性的 GO 能有效地稳定 W/O Pickering HIPE，最低 GO 含量仅约为 0.2mg/mL（相对于油相体积）。观察到所得多聚 Pickering HIPE 的闭孔形态，通过改变 GO 的浓度可调节多孔聚合物的空隙尺寸。通过煅烧除去多孔聚合物基质后，得到具有约 490m²/g 的高比表面积的三维大孔化学改性石墨烯（CMG）整体材料。在 CMG 中还发现了微孔，这可能是由于吸附在 GO 表面的 CTAB 分解所致。
