Diffusive behaviour of PLL–PEG coated colloids on λ-DNA brushes – tuning hydrophobicity

Yanagishima, Taiki and Di Michele, Lorenzo and Kotar, Jurij and Eiser, Erika (2012) Diffusive behaviour of PLL–PEG coated colloids on λ-DNA brushes – tuning hydrophobicity. Soft Matter, 8 (25). p. 2792. DOI 10.1039/C2SM25296A

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Abstract

We find ‘sticky’ 2D diffusion of poly-L-lysine–polyethylene glycol (PLL–PEG) coated silica colloids sedimented onto a brush of long, double stranded λ-DNA. The interaction is hypothesised to be hydrophobic, due to known physical properties of single and double stranded DNA and the systematic elimination of other known forces. The colloids are found to have variable affinity to the surface when prepared at different pH, even when the electrostatic environment of the brush is kept identical. Varied diffusive behaviour is observed: the diffusivity increases when the incubation pH is higher, and fewer beads are stuck to the brush surface. This sensitivity is found to agree with a simple model for the adsorption conditions of the PLL on the silica spheres. The significance of hydrophobicity is confirmed by capping the ssDNA ‘sticky’ end of the DNA, leading to a drastic enhancement of diffusivity of the particles on the brush.

Item Type: Article
Uncontrolled Keywords: 2012AREP; IA63;
Subjects: 99 - Other
Divisions: 99 - Other
Journal or Publication Title: Soft Matter
Volume: 8
Page Range: p. 2792
Identification Number: 10.1039/C2SM25296A
Depositing User: Sarah Humbert
Date Deposited: 28 Jun 2012 08:46
Last Modified: 23 Jul 2013 10:04
URI: http://eprints.esc.cam.ac.uk/id/eprint/2554

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