Abstract：Using ethyl orthosilicate as precursors, the pore size of the SiO2 membrane was increased by adding PAA, and the hydrophobicity was modified by the method of polymer solution precipitation phase transformation. The thermal stability, chemical composition, phase composition, specific surface area and pore size distribution, surface morphologies and hydrophobicity of the samples were analyzed by the method of TG-DTG, IR, XRD, AFM, BET and contact angle measurements. The results show that the optimum PAA adding amount is 10% (volume ratio), and the pore size is up to 53.73 nm after sintering at 800 ℃. With increasing the PAA adding amount, the pore size of SiO2 membrane increases, but when the adding amount reaches 15% (volume fraction), sintering at 800 ℃, the membrane surface begins to appear crack. The contact angle of the SiO2 membrane after hydrophobicity modification can increase to 113°. The pore size of the modified SiO2 membrane is obviously smaller after hydrophobically modified, it is because that the DDS coating on the membrane surface blocks the pore. It can be concluded that when the PAA is added in an amount between 10% and 15% and the sintering temperature is 600 ℃, the membrane with good hydrophobicity can be obtained.
同帜, 吉亮亮, 高婷婷, 王佳悦, 刘婷. SiO2膜的孔径调节及疏水改性[J]. 粉末冶金材料科学与工程, 2018, 23(4): 382-388.
TONG Zhi, JI Liangliang, GAO Tingting, WANG Jiayue, LIU Ting. Pore diameter adjusting and hydrophobic modification of SiO2 film. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 382-388.
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2018, Vol. 23 
