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Recovery of nanoparticles produced in phosphatidylcholine-based template phases
- Source :
- Journal of Colloid and Interface Science. 284:190-198
- Publication Year :
- 2005
- Publisher :
- Elsevier BV, 2005.
-
Abstract
- This paper focuses on the characterization and use of polymer-modified phosphatidylcholine (PC)/sodium dodecyl sulfate (SDS)-based inverse microemulsions as a template phase for BaSO4 nanoparticle formation. The area of the optically clear inverse microemulsion phase in the isooctane/hexanol/water/PC/SDS system is not significantly changed by adding polyelectrolytes, i.e., poly(diallyldimethylammonium chloride) (PDADMAC), or amphoteric copolymers of diallyldimethylammonium chloride and maleamid acid to the SDS-modified inverse microemulsion. Shear experiments show non-Newtonian flow behavior and oscillation experiments show a frequency-dependent viscosity increase (dilatant behavior) of the microemulsions. Small amounts of bulk water were identified by means of differential scanning calorimetry. One can conclude that the macromolecules are incorporated into the individual droplets, and polymer-filled microemulsions are formed. The polymer-filled microemulsions were used as a template phase for the synthesis of BaSO4 nanoparticles. After solvent evaporation the nanoparticles were redispersed in water and isooctane, respectively. The polymers incorporated into the microemulsion are involved in the redispersion process and influence the size and shape of the redispersed BaSO4 particles in a specific way. The crystallization process mainly depends on the type of solvent and the polymer component added. In the presence of the cationic polyelectrolyte PDADMAC the crystallization to larger cubic crystals is inhibited, and layers consisting of polymer-stabilized spherical nanoparticles of BaSO4 (6 nm in size) will be observed.
- Subjects :
- chemistry.chemical_classification
Materials science
Inorganic chemistry
Nanoparticle
Polymer
Polyelectrolyte
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
Biomaterials
Colloid and Surface Chemistry
Differential scanning calorimetry
chemistry
law
Phase (matter)
Microemulsion
Crystallization
Hexanol
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 284
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....821fe16a9c6a039af9ebfe1835790a96