自组装制备铁质文物保护用纳米缓蚀颗粒

长效缓蚀材料对于铁质文物的长期保护有着至关重要的作用.通过层层自组装的方法,在带负电荷的SiO2胶粒表面交替组装上了带正电荷的聚乙烯亚胺(PEI)层,带负电荷的聚苯乙烯磺酸钠(PSS)层,以及带正电荷的缓蚀活性成分苯并三氮唑(BTA)层.利用透射电子显微镜、zeta电位仪、X射线光电子能谱仪(XPS)等对纳米缓蚀颗粒进行了表征.结果表明,随着组装过程的进行,胶体粒子尺寸依次增大,颗粒表面zeta电位出现负正交替变化,表面元素化学环境也随之改变,氮原子的结合能随静电作用的增强向高位移动.缓蚀剂的负载量可通过多层组装方式提高,BTA单层负载量可达到35.4mg/g SiO2.

Corrosion inhibitor nano-particles for iron relics protection prepared by self-assembling

The corrosion protection plays a very important role in the protection of iron relics.A novel corrosion inhibitor nano-particle for iron relics was fabricated by consecutively layer-by-layer self-assembling of positive polyethylene imide(PEI),negative poly(sulfonated styrene)(PSS) and positive benzotriazole(BTA) on the surface of negatively charged SiO2 nanoparticles.Transmission electron microscopy,zetasizer and X-ray photoelectron spectroscopy(XPS) were employed to characterize the inhibitor nano-particles.Results reveal that the size of particles increases with the increase in the number of coating layers.The surface charge appears corresponding changes.The XPS result shows that the chemical surrounding of nitrogen atoms in the inhibitor nano-particles is changed with the assembly process due to the electrostatic effect between layers.The content of BTA in the inhibitor nano-particle with mono-layer of BTA reached 35.4mg/g SiO2,which can be readily controlled by improving the number of the PSS and BTA layers.