| 报告题目 | Green Synthesis of Nanogibbsite With or Without Porous Materials |
| 报告人 | Dr. Long Pan |
| 报告人单位 | Colgate Palmolive Co. |
| 报告时间 | 2016-10-20 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室（9004） |
| 主办单位 | 合肥微尺度物质科学国家实验室、中国科学技术大学化学与材料科学学院 |
| 报告介绍 | Abstract：
A ultrafine aluminum hydroxide nanoparticle suspension was prepared via controlled titration of [Al(H2O)6]3+ with L-arginine to pH 4.6. The prepared material, predominantly 10-30 nm in diameter, was purified by GPC technique and subsequently identified as gibbsite (or hydrargillite) polymorph via FTIR, powder XRD, and elemental analysis. Chemical environment and morphology were probed using 27Al/1H NMR, FTIR, ICP-OES, TEM-EDS, XPS, XRD, and N2 adsorption experiments. Furthermore, by incorporating the newly developed synthetic route, Al(OH)3 was partially loaded inside the mesopores (2.7nm) of MCM-41. EDS and NMR analysis indicates both tetrahedral and octahedral Al (Oh/Td = 1.4) is incorporated at 11% w/w total Al and Si/Al of 2.9 indicating part of Al embedded into Si framework. In addition, differences in elemental composition between surface XPS and bulk EDS analysis provided insight into the distribution of Al within the material. Higher ratio of Si/Al was observed on the external surface (3.6) of MCM-41 compared to the internal (2.9) cavities. Estimated O/Al ratios suggest predominantly Al(O)3 and Al(O)4 motifs present near the core and external surface, respectively. This novel methodology produces Al-MCM-41 with relatively high Al content while preserving the ordered SiO2 framework and can be used in lateral applications where incorporating hydrated or anhydrous Al2O3 is desired.
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