Oscillatory nanoindentation of highly compliant hydrogels: A critical comparative analysis with rheometry

被引:21
作者
Akhtar, Riaz [1 ]
Draper, Emily R. [2 ]
Adams, Dave J. [2 ]
Hay, Jennifer [3 ]
机构
[1] Univ Liverpool, Sch Engn, Dept Mech Mat & Aerosp Engn, Liverpool L69 3GH, Merseyside, England
[2] Univ Glasgow, Sch Chem, WESTChem, Glasgow G12 8QQ, Lanark, Scotland
[3] Nanomechanics Inc, Oak Ridge, TN 37830 USA
基金
英国工程与自然科学研究理事会;
关键词
MECHANICAL CHARACTERIZATION; DYNAMIC NANOINDENTATION; HYDRATED MATERIALS; ELASTIC-MODULUS; YOUNGS MODULUS; SHEAR MODULUS; INDENTATION; STIFFNESS; POLYMERS; BEHAVIOR;
D O I
10.1557/jmr.2018.62
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present a method for measuring the shear complex modulus of hydrogels by oscillatory nanoindentation, with unprecedented attention to procedure and uncertainty analysis. The method is verified by testing a typical low-molecular-weight gelator formed from the controlled hydrolysis of glucono-delta-lactone. Nanoindentation results are compared with those obtained by rheometry using both vane-in-cup and parallel-plate fixtures. At 10 Hz, the properties measured by oscillatory nanoindentation were G' = 38.1 +/- 2.8 kPa, tan delta = 0.22 +/- 0.02. At the same frequency, the properties measured by rheometry were G' = 15.3 +/- 2.9 kPa, tan delta = 0.11 +/- 0.016 (vane-in-cup) and G' = 7.9 +/- 1.1 kPa, tan delta = 0.05 +/- 0.004 (parallel-plate). The larger shear modulus measured by nanoindentation is due to the scale of testing. Whereas rheometry characterizes the bulk material response, nanoindentation probes the fibrous network of the gel. The procedure and analysis presented here are valuable for nanoindentation testing of other compliant materials such as hydrogels, soft biological tissue, and food products.
引用
收藏
页码:873 / 883
页数:11
相关论文
共 42 条
[41]  
White CC, 2005, MATER RES SOC SYMP P, V841, P187
[42]   Comparison of rheometric devices for measuring the rheological parameters of debris flow slurry [J].
Yang Hong-juan ;
Wei Fang-qiang ;
Hu Kai-heng ;
Zhou Gong-dan ;
Lyu Juan .
JOURNAL OF MOUNTAIN SCIENCE, 2015, 12 (05) :1125-1134