采用AFM法表征芳纶短切纤维和沉析纤维表面黏附力

Characterization of Surface Adhesion Force of Aramid Short Fiber and Fibrid by AFM

关键词:  AFM  探针修饰  黏附力  pH值  —NH—

Key Words:AFM  probe modification  adhesion force  pH value  NH group

摘要:采用原子力显微镜(AFM)探针修饰技术,用芳纶沉析纤维薄膜对探针进行修饰,在水中测定了芳纶短切纤维和沉析纤维的表面黏附力，探究了不同pH值对芳纶短切纤维和沉析纤维表面黏附力的影响。实验结果表明，芳纶沉析纤维薄膜修饰的探针与芳纶短切纤维和沉析纤维之间的黏附力分别为1.71 nN和9.20 nN,沉析纤维分子间黏附作用力大于其与芳纶短切纤维间的黏附力，认为探针针尖与芳纶短切纤维和沉析纤维—NH—之间的相互作用与pH值相关,芳纶沉析纤维修饰的探针与芳纶沉析纤维之间的黏附力受pH值的影响较大。

Abstract:The probe was modified with aramid fibrid membrane to measure the surface adhesion force of aramid short fibers and fibrid in water on the basis of probe modification techniques of AFM. Influence of different pH value on the surface adhesion force of aramid short fibers and fibrid was researched. It was concluded that adhesion forces between probe modified with aramide fibrid membrane and aramid short fiber and fibrid were 1.71 nN and 9.20 nN, respectively, adhesion force of fibrid was greater than that of short fiber. The interaction between the tip of probe and NH group of aramid samples related with pH value, adhesion force between aramid samples and the probe was more strongly influenced by pH value.