仿生制备石质文物SiO_2防护膜的探索  

Exploration of Bioinspired Preparation of SiO_2 Films on Historic Stones

作　　者：洪坤[1] 

机构地区：[1]江苏食品职业技术学院生物工程系,淮安223003

出　　处：《腐蚀与防护》2009年第2期113-115,共3页Corrosion & Protection

摘　　要：国内外的野外考察都在一些石刻古迹表面发现一层性能优良的天然草酸钙膜,受其启发,首次采用仿生技术,以十六烷基三甲基溴化铵(CTAB)自组装成有机模板来调控Na2SiF6的水解沉积,在青石表面制备出二氧化硅防护膜。通过正交设计确定了最佳的制备条件为25 ml浓度为0.050 mol/L的Na2SiF6,1.0 g硼酸,反应时间24 h。仿生合成出的SiO2膜具有优良的耐酸、耐污性能,憎水性有所增加,但仍保持青石亲水的性能。用红外光谱仪和扫描电子显微镜对仿生SiO2膜的结构和形貌进行了表征,并与正硅酸乙酯(TEOS)仿生法进行了比较。本方法为开发新型石质文物保护材料提供了思路。Enlightened by the natural protective films of oxalate calcium, biomimetic synthesis technology was used to prepare SiO2 protection film on the surfaces of stone for the first time. using CTAB template to regulate the hyfrolysis of sodium fluosilieate under the condition of adding boric acid. By the orthogonal experiment the best preparation condition was confirmed as 25 ml of sodium fluorosilieate （0. 050mol/L）, 1.0 g boric acid, and reaction time for 24 h. The structure and morphology of bioinspired films have been analyzed by FTIR and SEM, and compared with the TEOS method. The prepared bioinspired films have excellent performance of resisting acid and soil, improved contact angle and good hydrophilicity. This method should develop a new idea for historic stone conservation.

关 键 词：仿生合成 石质文物 二氧化硅膜 氟硅酸钠 

分 类 号：TB321[一般工业技术—材料科学与工程]