Microencapsulation of organic solvents in polyelectrolyte multilayer micrometer-sized shells

Citation
S. Moya et al., Microencapsulation of organic solvents in polyelectrolyte multilayer micrometer-sized shells, J COLL I SC, 216(2), 1999, pp. 297-302
Citations number
26
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN journal
00219797 → ACNP
Volume
216
Issue
2
Year of publication
1999
Pages
297 - 302
Database
ISI
SICI code
0021-9797(19990815)216:2<297:MOOSIP>2.0.ZU;2-#
Abstract
Hollow-shell micrometer-sized particles were fabricated in aqueous media by stepwise deposition of oppositely charged polyelectrolytes onto melamine l atex particles and biological cells with a dissolution of the core afterwar d. It is demonstrated that these shells can be suspended in various organic media, such as methanol, ethanol, pentanol, hexanol, octanol, octane, and decane, by a gradual solvent exchange. At this stage of the procedure the s hells contain the respective organic solvent. Oil suspensions in water are then formed by transferring the particles from the organic media into water , without the use of any further surfactant addition. By an additional adso rption step employing phospholipids, it is possible to obtain a dispersion of shells in organic solvents containing an aqueous solution inside. AFM me asurements are provided which show that the shells preserve their integrity in the different solvents. Confocal microscopy is employed to demonstrate encapsulation of solvents and the presence of lipids, (C) 1999 Academic Pre ss.