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Microencapsulation
Author(s) -
Sliwka Wolfgang
Publication year - 1975
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.197505391
Subject(s) - permeation , polymer , semipermeable membrane , nanotechnology , chemical engineering , materials science , fabrication , chemistry , membrane , composite material , biochemistry , engineering , medicine , alternative medicine , pathology
Microencapsulation is the enveloping of liquid droplets or fine solid particles to form microscopic capsules 1 to 5000 μm in diameter. For the fabrication of such capsules special techniques have been developed which take into account the substance to be encapsulated and the intended use of the capsules. The envelopes, consisting of natural or synthetic polymers, may be made permeable, semipermeable, or impermeable. Thus, there are several possibilities for controlled release of an encapsulated reactive substance, for example by destruction of the envelope or by permeation: alternatively, reactions can be allowed to take place within the microcapsules. Microencapsulation facilitates delivery of many substances to their site of utilization in a novel form of preparation and novel mode of dosage, the solids being dispersed very finely and having a very large surface area.