研究目的
Investigation of the α-Al2O3 formation in the presence of the anionic surfactant, sodium dodecyl sulfonate (SDS), as a structure directing agent and the effect of the calcination time on the structure.
研究成果
α-Alumina structures were successfully synthesized in the presence of the anionic SDS surfactant. The SDS molecules strongly interact with the positive charges of the alumina surface, leading to a porous bulk structure upon calcination. The calcination time affects the morphology of the structures, with worm-like morphology observed at shorter calcination times. The study demonstrates the potential of surfactant-assisted hydrothermal synthesis for controlling the morphology of α-Al2O3 structures.
研究不足
The study focuses on the effect of SDS surfactant and calcination time on the morphology of α-Al2O3 structures. The limitations include the specific conditions of hydrothermal synthesis and calcination, which may not be applicable to other synthesis methods or materials.
1：Experimental Design and Method Selection:
Hydrothermal synthesis supported with sodium dodecyl sulfonate anionic surfactant was used to prepare α-alumina structures. The effect of the surfactant and the calcination time were investigated.
2：Sample Selection and Data Sources:
Aluminum nitrate nonahydrate (Al(NO3)3.9H2O) was used as the Al source. Sodium dodecyl sulfonate (SDS) was used as an anionic surfactant. Ammonia solution (35%) was the hydrolysing agent.
3：9H2O) was used as the Al source. Sodium dodecyl sulfonate (SDS) was used as an anionic surfactant. Ammonia solution (35%) was the hydrolysing agent.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Renishaw Invia Reflex Confocal Raman spectrometer, Rigaku Rad B-Dmax II powder diffractometer, Nicolet iS5 FTIR spectrophotometer, Shimadzu TGA-50 thermal analyzer, Ronteck xflash detector analyzer associated with a scanning electron microscope (Leo-Evo 40XVP), Quantachrome Nova sorption analyzer.
4：Experimental Procedures and Operational Workflow:
A precursor solution was prepared by dissolving aluminum nitrate nonahydrate in deionized water. Surfactant solutions were added to the precursor solutions. The pH value was adjusted using ammonia solution and the solutions were transferred to a Teflon-lined autoclave. The reactions were continued at 180 °C for 9 h. After cooling, the products were precipitated by centrifugation and purified by washing with deionized water. The obtained products were dried in a vacuum oven overnight at 40 °C. The crude products were calcinated at 1200 °C for 3 and 6 h.
5：Data Analysis Methods:
Raman spectroscopy, X-Ray Difraction analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy techniques were used for characterization.
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