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Novel pH‐Sensitive Poly(silamine) Hydrogel Microsphere Possessing a Stable Skin Layer
Author(s) -
Nagasaki Yukio,
Luo LaiBin,
Tsuruta Teiji,
Kataoka Kazunori
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20011001)22:14<1124::aid-marc1124>3.0.co;2-4
Subject(s) - microsphere , layer (electronics) , self healing hydrogels , chemical engineering , materials science , silicon , layer by layer , polymer chemistry , core (optical fiber) , chemistry , biophysics , nanotechnology , composite material , engineering , metallurgy , biology
New silicon‐based polycationic microspheres, which consist of alternating 3,3‐dimethyl‐3‐silapentamethylene and N,N′ ‐diethylethylenediamine, were prepared. The deswelling of the poly(silamine) microspheres by means of pH‐jump experiments revealed the formation of an extremely stable skin layer. The layer could be kept at the interface between particle core and skin layer and shows a significantly different chemical potential. This may be explained by a limited osmotic‐pressure wave due to the high activation energy associated with the conformational changes.