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Self‐Assembly Mechanism of Nanoparticles of Ni‐Based Prussian Blue Analogues at the Air/Liquid Interface: A Synchrotron X‐ray Reflectivity Study
Author(s) -
GinerCasares Juan J.,
ClementeLeón Miguel,
Coronado Eugenio,
Brezesinski Gerald
Publication year - 2015
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201500350
Subject(s) - prussian blue , nanoparticle , monolayer , pulmonary surfactant , dipalmitoylphosphatidylcholine , synchrotron , x ray reflectivity , materials science , self assembly , nanotechnology , chemical engineering , crystallography , chemistry , phospholipid , membrane , optics , thin film , biochemistry , physics , electrode , phosphatidylcholine , engineering , electrochemistry
Prussian Blue analogue (PBA) nanoparticles can be self‐assembled at air/liquid interfaces to build novel materials with interesting magnetic features. Herein, we study the influence of the size of PBA Cs 0.4 Ni[Cr(CN) 6 ] 0.9 and K 0.25 Ni[Fe(CN) 6 ] 0.75 nanoparticles on the self‐assembly behavior by synchrotron X‐ray reflectivity. Both nanoparticles show similar Z‐potential values. The phospholipid dipalmitoylphosphatidylcholine and the amino surfactant dimethyldioctadecylammonium have been used as Langmuir monolayers to anchor the PBA nanoparticles and study the interplay of forces directing the self‐assembly of the nanoparticles at the surfactant/liquid interface. Whereas Cs 0.4 Ni[Cr(CN) 6 ] 0.9 nanoparticles with a diameter of 8 nm form an incomplete layer at the surfactant/water interface, the larger K 0.25 Ni[Fe(CN) 6 ] 0.75 nanoparticles with a diameter of 20 nm generate complete layers that can be stacked to one another. The size of the PBA nanoparticles is the main parameter determining the final arrangement at the air/liquid interface, due to the different extent of interparticle interaction. This study aims at the rationale design of PBA nanoparticles for an effective interfacial self‐assembly, ultimately leading to functional materials.