Different catalyzer induces different morphology of samples: when weak acid such as HAc and H3PO4 is used as a catalyzer, the acid radical will form complex with precursor, and thus the viscosity is large and crystallization is poor.

• 不同催化剂得到的样品状态不同:弱酸HAc、H_3PO_4作催化剂时,会与前驱体络合,样品的粘度较大,结晶较差;