TY - JOUR
T1 - Energetically Preferred Bilayered Coacervation of Oppositely Charged ZrHP Nanoplatelets
AU - Hwang, Jaemin
AU - Sung, Minchul
AU - Seo, Bokgi
AU - Shin, Kyounghee
AU - Lee, Jin Yong
AU - Park, Bum Jun
AU - Kim, Jin Woong
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/2/17
Y1 - 2021/2/17
N2 - A platform is introduced for bilayered coacervation of oppositely charged nanoplatelets (NPLs) at the oil-water interface. To this end, we synthesized two types of zirconium hydrogen phosphate (ZrHP) NPLs, cationically charged NPLs (CNPLs), and anionically charged NPLs (ANPLs) by conducting surface-initiated atom transfer radical polymerization. Taking advantage of the platelet geometry and controlled wettability, we demonstrated that ANPLs and CNPLs coacervate themselves to form a bilayered NPL membrane at the interface, which was directly confirmed by confocal laser scanning microscopy. Via theoretical consideration using the hit-and-miss Monte Carlo method, we determined that electrostatic attraction-driven coacervation of ANPLs and CNPLs at the interface shows a minimum attachment energy of ∼-106 kBT, which is comparable to the cases where NPLs charged with the same type of ions are attached. Finally, this unique and novel interfacial coacervation behavior allowed us to develop a pH-responsive smart Pickering emulsion system.
AB - A platform is introduced for bilayered coacervation of oppositely charged nanoplatelets (NPLs) at the oil-water interface. To this end, we synthesized two types of zirconium hydrogen phosphate (ZrHP) NPLs, cationically charged NPLs (CNPLs), and anionically charged NPLs (ANPLs) by conducting surface-initiated atom transfer radical polymerization. Taking advantage of the platelet geometry and controlled wettability, we demonstrated that ANPLs and CNPLs coacervate themselves to form a bilayered NPL membrane at the interface, which was directly confirmed by confocal laser scanning microscopy. Via theoretical consideration using the hit-and-miss Monte Carlo method, we determined that electrostatic attraction-driven coacervation of ANPLs and CNPLs at the interface shows a minimum attachment energy of ∼-106 kBT, which is comparable to the cases where NPLs charged with the same type of ions are attached. Finally, this unique and novel interfacial coacervation behavior allowed us to develop a pH-responsive smart Pickering emulsion system.
KW - ATRP
KW - bilayered coacervation
KW - charged nanoplatelets
KW - electrostatic attraction
KW - face-to-face interactions
KW - Pickering emulsion
UR - https://www.scopus.com/pages/publications/85100650855
U2 - 10.1021/acsami.0c18116
DO - 10.1021/acsami.0c18116
M3 - Article
C2 - 33533585
AN - SCOPUS:85100650855
SN - 1944-8244
VL - 13
SP - 7664
EP - 7671
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 6
ER -