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Enrollment Publications
Effect of microstructure on anomalous strain-rate-dependent behaviour of bacterial
Date: 2017-06-07
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Essay topic:Effect of microstructure on anomalous strain-rate-dependent behaviour of bacterial

AmbitFunctional polymer

Author:Xing Gao a,1, Zhijun Shi b,1, Andrew Laua, Changqin Liu a, Guang Yang b, Vadim V. Silberschmidt a

Key words:Strain-rate softening, Deformation mechanisms, Microstructural changes In-aqua testing, Bacterial cellulose hydrogel

Source: journal

Specific source :Materials Science and Engineering C

Published:

Abstract:

This study is focused on anomalous strain-rate-dependent behaviour of bacterial cellulose (BC) hydrogel that can be strain-rate insensitive, hardening, softening, or strain-rate insensitive in various ranges of strain rate. BC hydrogel consists of randomly distributed nanofibres and a large content of freewater; thanks to its ideal biocompatibility, it is suitable for biomedical applications.Motivated by its potential applications in complex loading conditions of body environment, its time-dependent behaviourwas studied by means of in-aqua uniaxial tension tests at constanttemperature of 37 °C at various strain rates ranging from 0.0001 s?1 to 0.3 s?1. Experimental results reflect anomalous strain-rate-dependent behaviour that was not documented before. Micro-morphological observations allowed identification of deformation mechanisms at low and high strain rates in relation to microstructural changes. Unlike strain-rate softening behaviours in other materials, reorientation of nanofibres and kinematics of free-water flow dominate the softening behaviour of BC hydrogel at high strain rates.


 

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 Address: Department of Life Science and Technology, East Campus, Huazhong University of Science and Technology, No. 1037 LuoYu
 Address: Department of Life Science and Technology, East Campus, Huazhong University of Science and Technology, No. 1037 LuoYu Address: College of Life Science and Technology, East Campus, Huazhong University of Science and Technology, No. 1037 LuoYu East  


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