Evidence for a macroscopic electric field in the sedimentation profiles of charged colloids

Nature

Volumn 429, Issue 6994, 2004, Pages 857-860

  Raşa, Mircea ^a   Philipse, Albert P ^a  

^a UTRECHT UNIVERSITY   (Netherlands)

Author keywords

[No Author keywords available]

Indexed keywords

DISPERSIONS; ELECTRIC FIELD EFFECTS; IONIC STRENGTH; MACROMOLECULES; SEDIMENTATION;

BAROMETRIC PREDICTIONS; ULTRACENTRIFUGAL ANALYSIS;

COLLOIDS;

ALCOHOL; SILICON DIOXIDE;

COLLOID;

ARTICLE; COLLOID; ELECTRIC CONDUCTIVITY; ELECTRIC FIELD; ELECTROPHORETIC MOBILITY; ENTROPY; GRAVITY; IONIC STRENGTH; MACROMOLECULE; MATHEMATICAL MODEL; MOLECULAR WEIGHT; PRIORITY JOURNAL; SEDIMENTATION; TRANSMISSION ELECTRON MICROSCOPY; ULTRACENTRIFUGATION;

EID: 3042649822     PISSN: 00280836     EISSN: None     Source Type: Journal    
DOI: 10.1038/nature02672     Document Type: Article

References (17)

1. Harding, S. E., Rowe, A. J. & Horton, J. C. (eds) Analytical Ultracentrifugation in Biochemistry and Polymer Science (Royal Society of Chemistry, Cambridge, 1993).
2. Stryer, L. Biochemistry, 4th edn (Freeman, New York, 1995).
3. Svedberg, T. & Pederson, O. Die Ultrazentrifuge (Dresden, 1940).
4. Piazza, R., Bellini, T. & Degiorgio, V. Equilibrium sedimentation profiles of screened charged colloids: a test of the hard-sphere equation of state. Phys. Rev. Lett. 71, 4267-4270 (1993).
5. Philipse, A. P. & Koenderink, G. H. Sedimentation-diffusion profiles and layered sedimentation of charged colloids at low ionic strength. Adv. Colloid Interface Sci. 100-102, 613-639 (2003).
6. Van Roij, R. Defying gravity with entropy and electrostatics: sedimentation of charged colloids. J. Phys.: Condens. Matter 15, S3569-S3580 (2003).
7. Hynninen, A. P., Van Roij, R. & Dijkstra, M. Sedimentation profiles of charged colloids: Entropic lift and charge separation. Europhys. Lett. 65, 719-725 (2004).
8. Biben, T. & Hansen, J. P. Sedimentation equilibrium in concentrated charged-stabilized colloidal suspensions. J. Phys.: Condens. Matter 6, A345-A349 (1994).
9. Löwen, H. The apparent mass in sedimentation profiles of charged suspensions. J. Phys.: Condens. Matter 10, L479-L485 (1998).
10. Hunter, R. J. Foundations of Colloid Science Vol 1 (Clarendon, Oxford, 1991).
11. Becker, W. M., Kleinsmith, L. J. & Mardin, J. The World of the Cell (Benjamin Cummins, San Francisco, 2000).
12. Meselson, M. & Stahl, F. W. The replication of DNA in Escherichia coli. Proc. Natl. Acad. Sci. USA 44, 671-682 (1958).
13. Philipse, A. P. Remarks on the Donnan condenser in the sedimentation-diffusion equilibrium of charged colloids. J. Phys.: Condens. Matter (submitted).
14. Philipse, A. P. & Vrij, A. Preparation and properties of nonaqueous model dispersions of chemically modified charged silica spheres. J. Colloid Interf. Sci. 128, 121-153 (1989).
15. Philipse, A. P. & Vrij, A. Determination of static and hydrodynamic interactions between monodisperse silica spheres in an optically matching, organic solvent. J. Chem. Phys. 88, 6459-6470 (1988).
16. Thies-Weesie, D. M. E., Philipse, A. P., Nägele, G., Mandl, B. & Klein, R. Non-analytical concentration dependence of sedimentation of charged silica spheres in an organic solvent. Experiments and calculations. J. Colloid Interf. Sci 176, 43-54 (1995).
17. Rasa, M., Philipse, A. P. & Meeldijk, J. D. Heteroaggregation, repeptisation, and stability in mixtures of oppositely charged colloids. J. Colloid Interf Sci. (in press).