A Reviewon Electrospinning Design and Nanofibre Assemblies

Topics: Rotation, Nanotechnology, High voltage Pages: 12 (3586 words) Published: July 4, 2013
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A review on electrospinning design and nanofibre assemblies

This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2006 Nanotechnology 17 R89 (http://iopscience.iop.org/0957-4484/17/14/R01) View the table of contents for this issue, or go to the journal homepage for more

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INSTITUTE OF PHYSICS PUBLISHING Nanotechnology 17 (2006) R89–R106

NANOTECHNOLOGY doi:10.1088/0957-4484/17/14/R01

TOPICAL REVIEW

A review on electrospinning design and nanofibre assemblies W E Teo1 and S Ramakrishna1,2,3,4
1 Nanoscience and Nanotechnology Initiative, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore 2 Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore 3 Division of Bioengineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore

E-mail: engtwe@nus.edu.sg and seeram@nus.edu.sg

Received 5 April 2006 Published 30 June 2006 Online at stacks.iop.org/Nano/17/R89 Abstract Although there are many methods of fabricating nanofibres, electrospinning is perhaps the most versatile process. Materials such as polymer, composites, ceramic and metal nanofibres have been fabricated using electrospinning directly or through post-spinning processes. However, what makes electrospinning different from other nanofibre fabrication processes is its ability to form various fibre assemblies. This will certainly enhance the performance of products made from nanofibres and allow application specific modifications. It is therefore vital for us to understand the various parameters and processes that allow us to fabricate the desired fibre assemblies. Fibre assemblies that can be fabricated include nonwoven fibre mesh, aligned fibre mesh, patterned fibre mesh, random three-dimensional structures and sub-micron spring and convoluted fibres. Nevertheless, more studies are required to understand and precisely control the actual mechanics in the formation of various electrospun fibrous assemblies. (Some figures in this article are in colour only in the electronic version)

1. Introduction
Since the beginning of this century, researchers all over the world have been re-looking at a century old process (Cooley 1902, Morton 1902) currently known as electrospinning. Probably unknown to most researchers for most of the last century, electrospinning is able to produce continuous fibres from the submicron diameter down to the nanometre diameter. It was not until the mid-1990s with interest in the field of nanoscience and nanotechnology that researchers started to realize the huge potential of the process in nanofibre production (Doshi and Reneker 1995). Nanofibres and nanowires with their huge surface area to volume ratio, about a thousand times higher than that of a human hair, have 4 Author to whom any correspondence should be addressed.

the potential to significantly improve current technology and find application in new areas. Applications for nanofibres include nanocatalysis, tissue scaffolds (Wang et al 2005b, Li et al 2002), protective clothing, filtration and nano-electronics (Ramakrishna et al 2005). Although there are other methods of fabricating nanofibres such as phase separation (Witte et al 1996) and template synthesis (Chakarvarti and Vetter 1998), few, if any, can match electrospinning in terms of its versatility, flexibility and ease of fibre production. At a laboratory level, a typical electrospinning set-up only requires a high voltage power supply (up to 30 kV), a syringe, a flat tip needle and a conducting collector. In terms of the flexibility of the process, electrospinning is able to fabricate continuous nanofibres from a huge range of materials. Of...
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