Structure and adsorption characterization of SBA-16 and functionalized materials

• Published in: Sheng wu yi xue gong cheng xue za zhi Vol. 28; no. 4; p. 768
• Main Authors: Zheng, Zongfu, Guo, Guiyuan, Hu, Yongpeng, Feng, Fuying, Xu, Guoyan, Tan, Hong
• Format: Journal Article
• Language: Chinese
• Published: China 01-08-2011
• Subjects: Adsorption; Drug Carriers - chemistry; Porosity; Silicon Dioxide - chemistry; Surface Properties
• ISSN: 1001-5515

In this study we synthesized a micro- and mesoporous material, SBA-16. And later on we functionalized it with octyltrimethoxysilane and octadecyltrimethoxysilane, respectively. The materials of SBA-16 and its functionalized form were characterized by nitrogen adsorption isotherms at 77K, small angle X-ray scattering (SAXS), Fourier-transform infrared (FT-IR), thermal gravimetric analysis (TGA), and adsorption isotherms of single component n-heptane, toluene and water vapour. The data of FT-IR and TGA demonstrated the successful chemical modification of surface and porous wall of SBA-16 with different hydrocarbon chains. The results of SAXS, nitrogen adsorption at 77K, and adsorption isotherms of probe molecules revealed that the functionalized SBA-16 materials possessed relatively less regularity, smaller BET surface area and pore volumes, and lower adsorption capacities for the probe molecules compared to the original SBA-16. However, the functionalized SBA-16 materials showed much less affinity to polar molecules such as water. This work provides useful fundamental information for future study of novel mesoporous silica materials as potential drug delivery carriers.