复合硅源在大理石表面仿生合成二氧化硅保护膜的研究

使用硅酸钠/氟硅酸钠复合硅源,通过仿生合成方法在大理石表面制备得到了一层SiO2为主要成分的保护膜,并对该膜的性能进行了检测评价.运用傅里叶变换红外光谱仪和扫描电子显微镜对膜的结构和形貌进行了表征,探讨了SiO2的成膜机理.结果表明,运用复合硅源可在近中性条件下在大理石表面形成SiO2膜,SiO2颗粒以球形形态沉积在大理石表面,表现出成核、颗粒长大和颗粒堆聚3个阶段.24 h可形成较完整、均匀致密的保护层.该膜不仅具有优良的耐酸、耐候性,还具有良好的透气性能.

Biomimetic synthesis of silica protective film on marble surfaces with compound silicon source

Based on the principle of biomimetic synthesis,silicon dioxide protective films are prepared on marble surface.Sodium silicate and sodium fluosilicate are selected as compound silicon source.The morphology is analyzed by scanning electron microscope and the structure of silicon dioxide film is characterized by Fourier transform infrared spectroscopy.Furthermore,the mechanism of the silicon dioxide film deposited on marble surface is discussed.The results show that the silicon dioxide film can be synthesized in the condition of pH 6-7.Silicon dioxide grains deposit on the marble surface via three process:nucleus formation,growing and accumulation.An integrity and compact film can be prepared in 24 hours.The film has excellent protective properteis such as acid resistance,weather fastness,gas permeability,and so on.