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Photo‐Switchable Behavior of Azobenzene‐Dye‐Modified Silica Nanoparticles and Their Assembly With Cyclodextrin Derivatives
Author(s) -
Isenbügel Kathrin,
Gehrke Yvonne,
Ritter Helmut
Publication year - 2012
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201100601
Subject(s) - azobenzene , photoisomerization , nanoparticle , isomerization , carbodiimide , cyclodextrin , polymer chemistry , chemistry , azo compound , benzoic acid , amine gas treating , photochemistry , chemical engineering , materials science , organic chemistry , polymer , nanotechnology , catalysis , engineering
Abstract The photochemically directed self‐assembly of azobenzene‐ and CD‐modified silica particles is presented. Azobenzene‐functionalized SiO 2 nanoparticles are synthesized from carbodiimide‐mediated condensation of the amine‐modified nanoparticles with (phenylazo)benzoic acid. The complementary host particles are synthesized by reacting amino‐SiO 2 with monotosyl‐CD. DLS shows the UV‐triggered agglomeration and disaggregation of the particles due to ( E )‐to‐( Z ) isomerization of the azo group. The photoisomerization process is monitored using UV‐Vis spectrometry. This technique of directed self‐assembly of anisotropic particles is an attractive option to form useful 3D superstructures by tunable agglomeration.