Yin Hao, Song Tong, Peng Xiong-Gang, Zhang Peng, Yu Run-Sheng, Chen Zhe, Cao Xing-Zhong, Wang Bao-Yi. Small angle X-ray scattering and positron annihilation spectroscopy of polyethyleneimine functionalized ordered mesoporous silica SBA-15 microstructureJ. Acta Physica Sinica, 2023, 72(11): 114101. DOI: 10.7498/aps.72.20230265