ISSN   1004-0595

CN  62-1095/O4

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陈杨, 穆为彬, 陆锦霞. 核壳结构PS/CeO2复合微球弹性模量的AFM测定[J]. 摩擦学学报, 2012, 32(1): 7-13.
引用本文: 陈杨, 穆为彬, 陆锦霞. 核壳结构PS/CeO2复合微球弹性模量的AFM测定[J]. 摩擦学学报, 2012, 32(1): 7-13.
CHEN Yang, MU Wei-bin, LU Jin-xia. Determination of Elastic Modulus of Composite PS/CeO2 Core-shell Microspheres by Atomic Force Microscope[J]. TRIBOLOGY, 2012, 32(1): 7-13.
Citation: CHEN Yang, MU Wei-bin, LU Jin-xia. Determination of Elastic Modulus of Composite PS/CeO2 Core-shell Microspheres by Atomic Force Microscope[J]. TRIBOLOGY, 2012, 32(1): 7-13.

核壳结构PS/CeO2复合微球弹性模量的AFM测定

Determination of Elastic Modulus of Composite PS/CeO2 Core-shell Microspheres by Atomic Force Microscope

  • 摘要: 利用原子力显微镜测定了聚苯乙烯(Polystyrene, PS)微球和核壳结构PS/CeO2复合微球的力-位移曲线,并根据Hertz接触理论计算了微球样品的弹性模量.结果表明:粒径在120 nm左右的PS微球的平均弹性模量约为2.80 GPa,其数值略低于聚苯乙烯块体材料的弹性模量.复合微球的弹性模量随CeO2壳层厚度的增加而增大,当CeO2壳厚分别约为8、12和16 nm时,其平均弹性模量依次约为7.93、8.25和10.67 GPa.与纯氧化铈相比,PS/CeO2复合微球的弹性模量更接近于聚苯乙烯微球.

     

    Abstract: Atomic force microscopy (AFM) was employed to probe the mechanical properties of polystyrene (PS) microspheres and composite PS/CeO2 core-shell structured microspheres. On the basis of Hertz's theory of contact mechanics, compressive moduli were measured by analyzing force-displacement curves captured on the microsphere samples. The average elastic modulus of the PS microspheres (120 nm in diameter) was 2.8 GPa. The compressive modulus is slightly lower than the modulus of polystyrene bulk materials. The thickness of the CeO2 shell had influence on the mechanical properties of composite microspheres. The modulus of the composite microspheres increased by increasing the thickness of the CeO2 shell. When the CeO2 shell thickness was 8, 12 and 16 nm, the average elastic modulus of the composite microspheres was 7.93, 8.25 and 10.67 GPa, respectively. It is found that the elastic modulus of the composite microsphere and PS core was close.

     

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