Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/198612

Title

Ordering of binary polymeric nanoparticles on hydrophobic surfaces assembled from low volume fraction dispersions

Author(s)

Mukhopadhyay, Rupa;  Al-Hanbali, Othman;  Pillai, Saju;  Hemmersam, Anne Gry;  Meyer, Rikke Louise;  Hunter, Alan Christy;  Rutt, Kenneth John;  Besenbacher, Flemming;  Moghimi, Seyed Moein;  Kingshott, Peter

Abstract

Well-ordered two-component nanoparticle (NP) patterns are generated on hydrophobic surfaces from mixed particle suspensions of very low volume fraction by simple drop-casting and self-assembly during solvent evaporation. A range of NP sizes (520-60 nm), volume fractions, and particle chemistries (aminated, carboxylated, sulfated) are tested, and in all cases, hexagonally packed patterns of the larger NP interdispersed with the smaller NP are obtained. The mechanism for formation appears to be entropically driven since the pattern formation occurs over a wide pH range (4-10) and is thus independent of particle surface charge. The nanopatterns show promise as model systems for studying interfacial phenomena such as protein adsorption and cell adhesion.

Publication type

Journal article

Source

Journal of the American Chemical Society, Vol. 129, no. 44 (Nov 2007), pp. 13390-13391

Publication year

2007

FOR Code(s)

03 Chemical Sciences;  06 Biological Sciences;  09 Engineering

Keyword(s)

Atomic force microscopy;  Colloids;  Crystal structure;  Crystallisation;  Dispersion;  Hydrogen-ion concentration;  Hydrophobicity;  Nanoparticles;  Particle size;  Polymers;  Scanning electron microscopy;  Surface properties

Publisher

American Chemical Society

ISSN

0002-7863

Publisher URL

http://dx.doi.org/10.1021/ja075988c

Copyright

Copyright © 2007 American Chemical Society.

Peer reviewed