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Nano‐Explosions of Nanoparticles for Sudden Release of Substances by Embedded Azo‐Components as Obtained via the Miniemulsion Process
Author(s) -
Volz Marissa,
Walther Paul,
Ziener Ulrich,
Landfester Katharina
Publication year - 2007
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200700240
Subject(s) - miniemulsion , materials science , polymer , scanning electron microscope , nanoparticle , particle (ecology) , chemical engineering , overpressure , composite material , thermal , nano , electron microscope , nanotechnology , optics , polymerization , thermodynamics , physics , geology , oceanography , engineering
The solid and thermally instable azoinitiators V‐65 and VR‐110 were embedded within a polymer particle by using the miniemulsion process and afterwards quickly decomposed by thermal treatment below the glass temperature of the polymer. The resulting nitrogen gas overpressure inside the particles leads to a disruption of the polymer particle and a possible sudden release of encapsulated substances. It is shown, by electron microscopic measurements, that the number of burst particles correlates with the applied temperatures as well as the heating time. The surface deformation could be verified by scanning electron microscope analyses.