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

机译：高相容性水凝胶的振荡纳米压痕：流变法的关键比较分析

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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.
机译：我们提出了一种通过振荡纳米压痕法测量水凝胶的剪切复数模量的方法，对过程和不确定性分析给予了前所未有的关注。通过测试由葡糖酸-δ-内酯的受控水解形成的典型的低分子量胶凝剂，验证了该方法。将纳米压痕结果与杯内叶片和平行板固定装置通过流变法获得的结果进行比较。在10Hz下，通过振荡纳米压痕测量的性质为G'＝ 38.1 +/- 2.8kPa，tanδ＝ 0.22 +/- 0.02。在相同的频率下，通过流变仪测得的特性为G'= 15.3 +/- 2.9 kPa，tanδ= 0.11 +/- 0.016（杯内叶片），G'= 7.9 +/- 1.1 kPa，tanδ= 0.05 +/- 0.004（平行板）。通过纳米压痕测量的较大剪切模量归因于测试规模。流变学表征了主体材料的响应，而纳米压痕则探测到了凝胶的纤维网络。此处介绍的过程和分析对于其他顺应性材料（例如水凝胶，生物软组织和食品）的纳米压痕测试非常有价值。

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  • 来源
    《Journal of Materials Research》 |2018年第8期|873-883|共11页
  • 作者

    Akhtar Riaz; Draper Emily R.; Adams Dave J.; Hay Jennifer;

  • 作者单位

    Univ Liverpool, Sch Engn, Dept Mech Mat & Aerosp Engn, Liverpool L69 3GH, Merseyside, England;

    Univ Glasgow, Sch Chem, WESTChem, Glasgow G12 8QQ, Lanark, Scotland;

    Univ Glasgow, Sch Chem, WESTChem, Glasgow G12 8QQ, Lanark, Scotland;

    Nanomechanics Inc, Oak Ridge, TN 37830 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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