+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Electrostatic self-assembly of neutral and polyelectrolyte block copolymers and oppositely charged surfactant

Electrostatic self-assembly of neutral and polyelectrolyte block copolymers and oppositely charged surfactant

Journal of Physical Chemistry. B 111(40): 11700

We investigated the phase behavior and the microscopic structure of the colloidal complexes constituted from neutral/polyelectrolyte diblock copolymers and oppositely charged surfactant by dynamic light scattering (DLS) and small-angle neutron scattering (SANS). The neutral block is poly(N-isopropylacrylamide) (PNIPAM), and the polyelectrolyte block is negatively charged poly(acrylic acid) (PAA). In aqueous solution with neutral pH, PAA behaves as a weak polyelectrolyte, whereas PNIPAM is neutral and in good-solvent condition at ambient temperature, but in poor-solvent condition above approximately 32 degrees C. This block copolymer, PNIPAM-b-PAA with a narrow polydispersity, is studied in aqueous solution with an anionic surfactant, dodecyltrimethylammonium bromide (DTAB). For a low surfactant-to-polymer charge ratio Z lower than the critical value ZC, the colloidal complexes are single DTAB micelles dressed by a few PNIPAM-b-PAA. Above ZC, the colloidal complexes form a core-shell microstructure. The core of the complex consists of densely packed DTA+ micelles, most likely connected between them by PAA blocks. The intermicellar distance of the DTA+ micelles is approximately 39 A, which is independent of the charge ratio Z as well as the temperature. The corona of the complex is constituted from the thermosensitive PNIPAM. At lower temperature the macroscopic phase separation is hindered by the swollen PNIPAM chains. Above the critical temperature TC, the PNIPAM corona collapses leading to hydrophobic aggregates of the colloidal complexes.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 052932297

Download citation: RISBibTeXText

PMID: 17880199

DOI: 10.1021/jp074404q

Related references

Complexes of polyelectrolyte-neutral double hydrophilic block copolymers with oppositely charged surfactant and polyelectrolyte. Journal of Physical Chemistry. B 111(29): 8351-8359, 2007

Salt effect on complex formation of neutral/polyelectrolyte block copolymers and oppositely charged surfactants. Langmuir 24(11): 5707-5713, 2008

The electrostatic co-assembly in non-stoichiometric aqueous mixtures of copolymers composed of one neutral water-soluble and one polyelectrolyte (either positively or negatively charged) block: a dissipative particle dynamics study. Physical Chemistry Chemical Physics 18(24): 16137-16151, 2016

Salt effect on microscopic structure and stability of colloidal complex obtained from neutral/polyelectrolyte block copolymer and oppositely charged surfactant. Colloids and Surfaces. B Biointerfaces 99: 127-135, 2012

Stoichiometric polyelectrolyte complexes of ionic block copolymers and oppositely charged polyions. Journal of Chemical Physics 125(19): 194902, 2006

Chain length recognition: core-shell supramolecular assembly from oppositely charged block copolymers. Science 283(5398): 7, 1999

Polyelectrolyte Complexation of Oligonucleotides by Charged Hydrophobic-Neutral Hydrophilic Block Copolymers. Polymers 11(1):, 2019

Foam films from oppositely charged polyelectolyte/surfactant mixtures: effect of polyelectrolyte and surfactant hydrophobicity on film stability. Langmuir 26(12): 9321-9327, 2010

Phase behavior and molecular thermodynamics of coacervation in oppositely charged polyelectrolyte/surfactant systems: a cationic polymer JR 400 and anionic surfactant SDS mixture. Langmuir 28(28): 10348-10362, 2012

Electrostatic binding of oppositely charged surfactants to spherical polyelectrolyte brushes. Physical Chemistry Chemical Physics 13(20): 9706-9715, 2011

Supramolecular assembly of a thermoresponsive steroidal surfactant with an oppositely charged thermoresponsive block copolymer. Physical Chemistry Chemical Physics 19(2): 1504-1515, 2017

Association and structure formation in oppositely charged polyelectrolyte-surfactant mixtures. Advances in Colloid and Interface Science 158(1-2): 68-83, 2010

Salt effect on the complex formation between polyelectrolyte and oppositely charged surfactant in aqueous solution. Journal of Physical Chemistry. B 109(21): 10807-10812, 2005

Salt effect on the interactions between gemini surfactant and oppositely charged polyelectrolyte in aqueous solution. Journal of Colloid and Interface Science 306(2): 405-410, 2007

Impact of Polyelectrolyte Chemistry on the Thermodynamic Stability of Oppositely Charged Macromolecule/Surfactant Mixtures. Langmuir 32(5): 1259-1268, 2016