DNA-Mediated Two-Dimensional Colloidal Crystallization above Different Attractive Surfaces

Jahn, Sabrina and Geerts, Nienke and Eiser, Erika (2010) DNA-Mediated Two-Dimensional Colloidal Crystallization above Different Attractive Surfaces. Langmuir, 26 (22). pp. 16921-16927. ISSN 0743-7463 DOI 10.1021/la103192q

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Abstract

We explore the formation of “floating” two-dimensional colloidal crystals above weakly attractive surfaces that are either positively or negatively charged. In particular, we studied crystal formation above positively charged poly-l-lysine−poly(ethylene glycol) surfaces with and without short single-stranded DNA and above negatively charged bovine albumin serum−streptavidin multilayers. Confocal microscopy revealed the evolution of crystals several micrometers above all three surfaces. Interestingly, the “flying height” of crystals was found to depend on the surface coating. All crystalline structures remained remarkably stable over weeks, even under high salt conditions. Neither lifting the crystals nor lowering them by means of buoyancy forces destroyed them.

Item Type:	Article
Uncontrolled Keywords:	2010AREP, IA61, BPI,
Subjects:	99 - Other
Divisions:	99 - Other
Journal or Publication Title:	Langmuir
Volume:	26
Page Range:	pp. 16921-16927
Identification Number:	10.1021/la103192q
Depositing User:	Sarah Humbert
Date Deposited:	22 Dec 2010 16:14
Last Modified:	23 Jul 2013 10:00
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1976

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