期刊
COLLOID AND POLYMER SCIENCE
卷 283, 期 12, 页码 1267-1277出版社
SPRINGER
DOI: 10.1007/s00396-005-1334-1
关键词
heterocoagulation; submicronic particles; magnetic emulsion; fluorescent
Using the stepwise heterocoagulation concept, fluorescent and highly magnetic submicronic core-shell polymer particles were prepared. For this purpose a negatively charged oil-in-water magnetic emulsion was first modified by adsorbing the poly(ethyleneimine) (PEI). Secondly, low glass transition temperature (T-g = 10 degrees C) anionic film-forming nanoparticles were adsorbed onto the cationic magnetic droplets. Finally the encapsulation was induced by heating the hetero-coagulates above the T-g of the film-forming nanoparticles. To produce labeled magnetic particles, fluorescent nanoparticles and film-forming nanoparticles were simultaneously adsorbed. PEI adsorption was investigated. Also investigated was the influence of the amount of film-forming nanoparticles and fluorescent nanoparticles on the encapsulation efficiency.
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