标题：Effects of inorganic acids and divalent hydrated metal cations (Mg2+, Ca2+, Co2+, Ni2+) on gamma-AlOOH sol-gel process
作者：Zhang, Jian; Xia, Yuguo; Zhang, Li; Chen, Dairong; Jiao, Xiuling
作者机构：[Zhang, Jian; Chen, Dairong; Jiao, Xiuling] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China.; [Xia, Yuguo; Zhang, Li; Chen, Dairo 更多
通讯作者地址：[Xia, YG]Shandong Univ, Natl Engn Res Ctr Colloidal Mat, Jinan 250100, Peoples R China.
来源：PHYSICAL CHEMISTRY CHEMICAL PHYSICS
摘要：In-depth understanding of the sol-gel process plays an essential role in guiding the preparation of new materials. Herein, the effects of different inorganic acids (HCl, HNO3 and H2SO4) and divalent hydrated metal cations (Mg2+, Ca2+, Co2+, Ni2+) on gamma-AlOOH sol-gel process were studied based on experiments and density functional theory (DFT) calculations. In these experiments, the sol originating from the gamma-AlOOH suspension was formed only with the addition of HCl and HNO3, but not with H2SO4. Furthermore, the DFT calculations showed that the strong adsorption of HSO4- on the surface of the gamma-AlOOH particles, and the hydrogen in HSO4- pointing towards the solvent lead to an unstable configuration of electric double layer (EDL). In the experiment, the gelation time sequence of gamma-AlOOH sol obtained by adding metal ions changed when the ionic strength was equal to or greater than 0.198 mol kg(-1). The DFT calculations demonstrated that the adsorption energy of hydrated metal ions on the g-AlOOH surface can actually make a difference in the sol-gel process.