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Unraveling the Agglomeration Mechanism in Charged Block Copolymer and Surfactant Complexes

Journal Article · · Macromolecules
 [1];  [2];  [3];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Data Analysis and Visualization
  2. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials Science
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences and Computer Science and Mathematics Division

Here, we report a molecular dynamics simulation investigation of self-assembly and complex formation of charged-neutral double hydrophilic and hydrophobic-hydrophilic block copolymers (BCP) with oppositely charged surfactants. Furthermore, the structure of the surfactant micelles and the BCP aggregation on the micelle surface is systematically studied for five different BCP volume fractions that also mimics a reduction of the surfactant concentration. The local electrostatic interactions between the oppositely charged species encourage the formation of core-shell structures between the surfactant micelles where the surfactants form the cores and the charged blocks of the BCP form the corona. The emergent morphologies of these aggregates are contingent upon the nature of the BCP neutral blocks. The hydrophilic neutral blocks agglomerate with the micelles as hairy colloidal structures while the hydrophobic neutrals agglomerate in lamellar structures with the surfactant micelles. The distribution of counterion charges along the simulation box show a close-to-normal density distribution for the hydrophilic neutral blocks and a binodal distribution for hydrophobic neutral blocks. No specific surfactant concentration dependent scaling relation is observed as opposed to the simpler case of homo-polyelectrolytes.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Spallation Neutron Source; Oak Ridge Leadership Computing Facility (OLCF); Joint Institute for Computational Sciences (JICS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1346670
Alternate ID(s):
OSTI ID: 1484360
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 3 Vol. 50; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Intermolecular Interactions in Polyelectrolyte and Surfactant Complexes in Solution journal December 2018
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Computer study of the solubilization of polymer chains in polyelectrolyte complex cores of polymeric nanoparticles in aqueous media journal January 2018
Janus or homogeneous nanoparticle mediated self-assembly of polymer electrolyte fuel cell membranes journal January 2018
The biphasic effect of ABA triblock copolymers on the self-assembly of surfactants: insight from dissipative particle dynamics journal January 2019

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