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Dramatic Effect of Magnetite Particles on the Dynamics of Photogenerated Free Radicals
Author(s) -
Scaiano J. C.,
Monahan Sarah,
Renaud Jocelyn
Publication year - 1997
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1997.tb01921.x
Subject(s) - radical , magnetite , dynamics (music) , chemistry , magnetite nanoparticles , photochemistry , chemical physics , materials science , nanotechnology , nanoparticle , physics , organic chemistry , magnetic nanoparticles , acoustics , metallurgy
— Polymeric particles of about 1 u.m in diameter and containing around 40% magnetite have a dramatic influence on the dynamics of triplet radical pair reactions occurring in micelles in their vicinity. The effect has been monitored with laser flash photolysis techniques and results in a decrease of the number of radicals that separate from their geminate partner and an acceleration of radical pair geminate reactions. The effect involves remote interactions because the solution contains ca 10 11 micelles for each polymeric particle. Magnetite also perturbs the way in which the radicals interact with an external magnetic field.