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Electrochemically Triggered Interfacial Deposition/Assembly of Aqueous‐Suspended Colloids
Author(s) -
Iqbal Md. Shamim,
Zhan Wei
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201902143
Subject(s) - colloid , deposition (geology) , monolayer , chemical engineering , aqueous solution , materials science , electrolyte , ferrocene , polyelectrolyte , electrode , electrochemistry , polystyrene , nanotechnology , chemistry , organic chemistry , composite material , paleontology , sediment , engineering , biology , polymer
Abstract Following our recent work on polyelectrolyte deposition on ferrocene‐terminated self‐assembled monolayers ( Langmuir 2018 , 34, 12776–12786), we seek in this study to answer the following question: How would aqueous‐suspended colloids respond to the same electrochemical trigger – ferrocene oxidation? Using carboxylic‐terminated polystyrene nano‐/microbeads as a model colloid, we confirm first their transfer to and deposition at such redox‐active surfaces. Key factors involved, including the starting electrode surfaces, colloid size, range/duration of applied potential, and small supporting electrolytes, are examined in detail. A particularly interesting finding among these is the superior efficiency of the electrochemically triggered assembly compared to the electrically driven process. Taking advantage of this feature, we demonstrate fast, high‐fidelity colloid micropattern formation on electrodes at the end.