Journal
LANGMUIR
Volume 28, Issue 22, Pages 8329-8336Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la3009943
Keywords
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Funding
- US-Israel Binational Science Foundation
- Schmidt Minerva Center
- ISF
- Penman Family Foundation
- National Research Foundation of Korea
- Ministry of Education, Science and Technology [R33-2008-000-10163-0]
- National Science Foundation NSF [DMR1101900]
- Max Planck Society (MPG)
- Korea Ministry of Education, Science and Technology (MEST)
- Gyeongsangbuk-Do
- Pohang City
- Korea government (MEST) [NRF-C1ABA001-2011-0029960, 2012R1A1A200927S]
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The aggregation of inhomogeneously charged colloids with the same average charge is analyzed using Monte Carlo simulations. We find aggregation of colloids for sizes in the range 10-200 nm, which is similar to the range in which aggregation is observed in several experiments. The attraction arises from the strongly correlated electrostatic interactions associated with the increase in the counterion density in the region between the particles; this effect is enhanced by the discreteness and mobility of the surface charges. Larger colloids attract more strongly when their surface charges are discrete. We study the aggregation as functions of the surface charge density, counterion valence, and volume fraction.
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