Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties

Details Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties

2007-12-04

arxiv.org/abs/0712.0475v1

Physics

Condensed Matter

Materials Science

9 pages in templated form, 9 figures, paper submitted to Soft Matter

Scientific paper

We report the co-assembly and adsorption properties of coacervate complexes made from polyelectrolyte-neutral block copolymers and oppositely charged nanocolloids. The nanocolloids put under scrutiny were ionic surfactant micelles and highly charged 7 nm cerium oxide (CeO2) nanoparticles. Static and dynamic light scattering was used to investigate the microstructure and stability of the organic and hybrid complexes. The microstructure of the CeO2-based complexes was resolved using cryogenic transmission electronic microscopy (Cryo-TEM), and it revealed that the cores were clusters made from densely packed nanoparticles. In the concentration range of interest, c = 10-4 - 1 wt. %, the surfactant-based complexes were shown to exhibit a critical association concentration (cac) whereas the nanoparticle-polymer hybrids did not. The adsorption properties of the same complexes were investigated above the cac by stagnation point adsorption reflectometry. The adsorbed amount was measured as a function of time for polymers and complexes using anionically charged silica and hydrophobic poly(styrene) substrates. It was found that all complexes adsorbed readily on both types of substrates up to a level of 1 - 2 mg m-2 at stationary state. Upon rinsing however, the adsorbed layer was removed for the surfactant-based systems, but not for the cerium oxide clusters. As for the solution properties, these finding were interpreted in terms of a critical association concentrations which are very different for organic and hybrid complexes.

Affiliated with

Also associated with

No associations

Rating

Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Organic versus Hybrid Coacervate Complexes : Co-Assembly and Adsorption Properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-681498