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Flower‐Like SiO 2 ‐Coated Polymer/Fe 3 O 4 Composite Microspheres of Super‐Paramagnetic Properties: Preparation via A Polymeric Microgel Template Method
Author(s) -
Wang Gongzheng,
Zhang Ying,
Fang Yu,
Gu Zhongze
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01662.x
Subject(s) - tetraethyl orthosilicate , composite number , materials science , copolymer , suspension polymerization , microsphere , acrylic acid , polymerization , monomer , polymer , chemical engineering , paramagnetism , absorption (acoustics) , polymer chemistry , composite material , nanotechnology , physics , quantum mechanics , engineering
N ‐isopropylacrylamide (NIPAM) and acrylic acid (AA) copolymer microgels P(NIPAM ‐ co ‐AA) with different amount of AA were prepared by using a reverse suspension polymerization technique. The polymeric microgels were used firstly as micro‐containers to include Fe 3 O 4 nanoparticles and then as micro‐reactors to control the hydrolysis of tetraethyl orthosilicate (TEOS). In this way, various super‐paramagnetic composite microspheres (P(NIPAM‐AA)/Fe 3 O 4 /SiO 2 ) with different morphologies were prepared. It was demonstrated that the morphologies of the composite microspheres could be tailored to a certain extent by either varying the ratio of the two monomer units in the template microgels or the amount of SiO 2 deposited. The sensitivity of the composite microspheres to an external magnetic field was determined by the amount of Fe 3 O 4 included. The magnetic responsibility of the composite microspheres, and the ease of modifying the surfaces may make the microspheres of important use in the mild separation of bioactive materials, loading of active materials, and radiation and shock absorption, etc.