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Issue 4, 2014
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Structural reinforcement of microvascular networks using electrostatic layer-by-layer assembly with halloysite nanotubes

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Abstract

We demonstrate a method for tailoring local mechanical properties near channel surfaces of vascular structural polymers in order to achieve high structural performance in microvascular systems. While synthetic vascularized materials have been created by a variety of manufacturing techniques, unreinforced microchannels act as stress concentrators and lead to the initiation of premature failure. Taking inspiration from biological tissues such as dentin and bone, these mechanical deficiencies can be mitigated by complex hierarchical structural features near to channel surfaces. By employing electrostatic layer-by-layer assembly (ELbL) to deposit films containing halloysite nanotubes onto scaffold surfaces followed by matrix infiltration and scaffold removal, we are able to controllably deposit nanoscale reinforcement onto 200 micron diameter channel surface interiors in microvascular networks. High resolution strain measurements on reinforced networks under load verify that the halloysite reduces strain concentrations and improves mechanical performance.

Graphical abstract: Structural reinforcement of microvascular networks using electrostatic layer-by-layer assembly with halloysite nanotubes

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Publication details

The article was received on 29 Aug 2013, accepted on 25 Oct 2013 and first published on 29 Oct 2013


Article type: Communication
DOI: 10.1039/C3SM52288A
Citation: Soft Matter, 2014,10, 544-548
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    Structural reinforcement of microvascular networks using electrostatic layer-by-layer assembly with halloysite nanotubes

    S. C. Olugebefola, A. R. Hamilton, D. J. Fairfield, N. R. Sottos and S. R. White, Soft Matter, 2014, 10, 544
    DOI: 10.1039/C3SM52288A

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