NDLI: Control and modelling of capillary flow of epoxy resin in aligned carbon nanotube forests

Content Provider	Royal Society of Chemistry (RSC)
Author	Farmer, B. L. Ghita, O. R. Beard, J. D. Rouholamin, D. Evans, K. E.
Copyright Year	2015
Abstract	This paper examines the mechanism of infiltration by capillary flow of epoxy resin into vertically-aligned carbon nanotube forests. The resin viscosity during curing was characterized by rheometry. Carbon nanotube forests were brought into contact with resin at a range of times during curing, therefore at a range of viscosities. The penetration of the resin into the forests was measured using electron microscopy, X-ray micro-computed tomography and energy-dispersive X-ray spectroscopy, the latter relying on a chromium-complex dye additive which acts as a marker for the presence of resin. Experimental results were compared to a simulation based on the Implicit Lucas–Washburn equation for capillary flow. It was found that prior to the resin gel point, the resin penetrates through the full height of the forest. Close to the gel point, the flow into the forest ceases, leaving unwetted regions of nanotubes. Understanding the relationship between resin flow in nanotube structures and the resin viscosity and curing has important application in the fabrication of nanocomposite materials. This “partial wetting” effect is a key requirement for a previously proposed method for the fabrication of carbon nanotube composites by additive manufacture (AM) which would provide strong interlayer reinforcement combined with the versatility of AM.
Starting Page	39433
Ending Page	39441
Page Count	9
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	5
Issue Number	49
Journal	RSC Advances
DOI	10.1039/c5ra03393d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Viscosity Energy-dispersive X-ray spectroscopy Epoxy Washburn Amplitude modulation Capillary action Carbon nanotube X-ray crystallography Dye Transmission electron microscopy Gel point Resin Nanocomposite
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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