TY - JOUR
T1 - Confinement-Induced Colloidal Attractions in Equilibrium
AU - Han, Yilong
AU - Grier, David G.
N1 - Funding Information:
We are grateful to Sven Behrens for extensive conversations. This work was supported principally by the MRSEC program of the NSF through Grant No. DMR-9808595. Additional support was provided by the NSF through Grant No. DMR-9730189.
PY - 2003/7/17
Y1 - 2003/7/17
N2 - The Poisson-Boltzmann theory for colloidal electrostatic interactions predicts that charged colloidal spheres dispersed in water should repel each other, even when confined by charged surfaces. Direct measurements on highly charged polystyrene spheres, however, reveal strong, long-ranged confinement-induced attractions that have yet to be explained. We demonstrate that anomalous attractions also characterize the equilibrium pair potential for more weakly charged colloidal silica spheres sedimented into a monolayer above a glass surface. This observation substantially expands the range of conditions for which mean-field theory incorrectly predicts the sign of macroions’ interactions, and provides new insights into how confinement induces long-ranged like-charge attractions.
AB - The Poisson-Boltzmann theory for colloidal electrostatic interactions predicts that charged colloidal spheres dispersed in water should repel each other, even when confined by charged surfaces. Direct measurements on highly charged polystyrene spheres, however, reveal strong, long-ranged confinement-induced attractions that have yet to be explained. We demonstrate that anomalous attractions also characterize the equilibrium pair potential for more weakly charged colloidal silica spheres sedimented into a monolayer above a glass surface. This observation substantially expands the range of conditions for which mean-field theory incorrectly predicts the sign of macroions’ interactions, and provides new insights into how confinement induces long-ranged like-charge attractions.
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U2 - 10.1103/PhysRevLett.91.038302
DO - 10.1103/PhysRevLett.91.038302
M3 - Article
AN - SCOPUS:0041384193
SN - 0031-9007
VL - 91
JO - Physical Review Letters
JF - Physical Review Letters
IS - 3
ER -