Part 2. Crossover from depletion attraction to adsorption: Polyethylene glycol induced electrostatic repulsion between lipid bilayers

Macromolecules

Volumn 31, Issue 23, 1998, Pages 8258-8263

  Kuhl, Tonya L ^a   Berman, Alan D ^a   Hui, Sek Wen ^b   Israelachvil, Jacob N ^a  

^a University of California   (United States)

^b ROSWELL PARK CANCER INSTITUTE   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ADSORPTION; ELECTROSTATICS; HYDRODYNAMICS; LIPIDS; MOLECULAR WEIGHT; POSITIVE IONS; SOLUTIONS; SURFACE PHENOMENA;

ELECTROSTATIC REPULSION;

POLYETHYLENE GLYCOLS;

EID: 0032205991     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma9714326     Document Type: Article

References (29)

1. Preceding paper: Kuhl, T. L.; Berman, A. D.; Hui, S. W.; Israelachvili, J. N. Macromolecules 1998, 31, 8250-8257.
2. b is the bulk polymer concentration. For the same binding energy per segment, the critical condition is therefore sensitive mainly to the segment number and less so (through the log-dependence) on the concentration. Thus, below some critical polymer concentration there is ZERO adsorption, above it there is finite (even quite high) adsorption. While this paper applies to poor solvent conditions, the general ideas are believed to also apply to theta and good solvent conditions. See also: Ploehn, H. J. Colloids Surf. A 1994, 86, 25-40.
3. b is the bulk polymer concentration. For the same binding energy per segment, the critical condition is therefore sensitive mainly to the segment number and less so (through the log-dependence) on the concentration. Thus, below some critical polymer concentration there is ZERO adsorption, above it there is finite (even quite high) adsorption. While this paper applies to poor solvent conditions, the general ideas are believed to also apply to theta and good solvent conditions. See also: Ploehn, H. J. Colloids Surf. A 1994, 86, 25-40.
4. Strictly speaking, this argument is not completely correct because the loss in translational entropy is not the only driving force.
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26. 4. We found that the apparent surface potential was greatly reduced when divalent counterions were added to solution (results not shown).
27. 4. We found that the apparent surface potential was greatly reduced when divalent counterions were added to solution (results not shown).
28. In the absence of added electrolyte, 20k PEG still adsorbed to the bilayer surface. However, we also measured a long-range, apparently electrostatic repulsion in these experiments. Conversely, PEG 20k did not adsorb to bare, uncoated mica substrates in the absence of added electrolyte (results not shown).
29. Other reasons for a reduction in viscosity are shear thinning of the polymer solution at these intermediate separations, or an anomalous structural change of the polymer coils due to their interaction with the complexing ions in solution. Leibler, L.; Pezron, E.; Pincus, P. A. Polymer 1988, 29, 1105-1109.