Type

Journal Article

Authors

Umar Khan
Peter May
Arlene O'Neill
Jonathan Coleman

Subjects

Physics

Topics
centrifugation size controlled different size graphene high rate nanoscience materials atomic molecular and chemical physics

Size selection of dispersed, exfoliated graphene flakes by controlled centrifugation (2011)

Abstract Liquid exfoliation of graphene generally results in flakes with lateral size of one micron or less on average, too small for many applications. In this paper we describe a method to separate an existing dispersion with mean flake length of ~1 ?m into fractions, each with different mean flake size. The initial dispersion is centrifuged at a high centrifugation rate, separating small flakes in the supernatant from large flakes in the sediment. Redispersion of the sediment, followed by successive centrifugation, separation and redispersion cycles can be used to separate the flakes by size so long as the centrifugation rate is decreased with each cycle. This procedure results in a range of dispersions with mean flake length varying from 1 ?m for the highest final centrifugation rate to 3.5 ?m for the sample whose final centrifugation rate was 500 rpm.
Collections Ireland -> Trinity College Dublin -> RSS Feeds
Ireland -> Trinity College Dublin -> School of Physics
Ireland -> Trinity College Dublin -> Physics (Scholarly Publications)
Ireland -> Trinity College Dublin -> RSS Feeds
Ireland -> Trinity College Dublin -> Physics

Full list of authors on original publication

Umar Khan, Peter May, Arlene O'Neill, Jonathan Coleman

Experts in our system

1
Umar Khan
Trinity College Dublin
Total Publications: 37
 
2
Peter May
Trinity College Dublin
Total Publications: 27
 
3
Arlene O'Neill
Trinity College Dublin
Total Publications: 25
 
4
Jonathan Coleman
Trinity College Dublin
Total Publications: 217