摘要
应用红外光谱仪、场发射扫描电镜、差示扫描热量仪、原位纳米力学测试系统对青年(20~25岁)与老年(70~75岁)指甲的表面结构、形貌、水含量及力学性能进行了实验分析。结果表明:与青年组成员指甲相比,老年组成员指甲的PO 2、C-O、CH 2与CONH基团的峰位向高波数移动;老年组成员指甲表面比青年组成员指甲粗糙并表现出明显的纵向纹理;尽管其总含水量与青年组成员指甲相当,但老年组成员指甲结合水的含量比青年组成员指甲的低;老年组成员指甲的硬度与约化弹性模量均高于青年组成员指甲相应对比量,因此,老年组成员指甲在划痕实验中显示出更好的耐磨性,但在较大载荷时出现明显的裂纹。
Infrared spectrometer,field-emission scanning electron microscope,differential scanning calorimeter and nanomechanical testing system were used to analyze the surface structure,morphology,water content,and indentation properties of fingernails of people in two age groups,a youth group(20-25 years old)and a senior group(70-75 years old).The results reveal that the vibration peaks of PO 2,C-O,CH 2 and CONH bonds from the senior nails are shifted to long wavenumbers;the surfaces of these nails are rougher and show more directional preference than those of the young ones;and that although the total water contents of the samples from both age group are equivalent,the bound water content in the nails of the seniors is lower than that in the nails of the young people.The hardness and elastic modulus of nails of the seniors are higher,responsible for a stronger abrasion resistance to scratching but noticeable cracks under heavy load.
作者
梁婷
王茜
甘超亮
朱旻昊
张蒙祺
Liang Ting;Wang Qian;Gan Chaoliang;Zhu Minhao;Zhang Mengqi(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;Department of Mechanical Engineering,Northwestern University,Evanston 60208,USA;School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Institute of Tribology,Southwest Jiaotong University,Chengdu 610031,China)
出处
《分析仪器》
CAS
2021年第1期50-58,共9页
Analytical Instrumentation
基金
中央高校基本科研业务费专项资金资助(项目编号:2682020CX37)。
关键词
人手指甲
表面结构
表面形貌
表面力学性能
水含量
Human fingernails
Surface structure
Surface morphology
Surface mechanical properties
Water content