TY - JOUR
T1 - Interfacial Viscoelasticity of Self-Assembled Hydrophobic/Hydrophilic Particles at an Air/Water Interface
AU - Rahman, Syed Ehsanur
AU - Laal-Dehghani, Nader
AU - Christopher, Gordon F.
N1 - Funding Information:
The authors would like to acknowledge NSF for funding this work (NSF CBET #1437710).
Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/10/8
Y1 - 2019/10/8
N2 - Hydrophobic/hydrophilic mixtures of latex particles at an air/water interface self-assemble, creating space filling, interconnected aggregates as the relative surface fractions of the dissimilar particles approach 0.5, which is reflected both in qualitative observation and fractal dimension of the microstructure. It is hypothesized that this change in microstructure occurs due to an asymmetry in the electrostatic interaction between similar and dissimilar particles caused by polarization of hydrophilic particles by hydrophobic particles. The changes in both microstructure and interparticle interactions significantly impact the interfacial viscoelasticity. As greater shape complexity is observed, interfacial complex moduli can increase by as much as 3 orders of magnitude and interfaces become more elastic.
AB - Hydrophobic/hydrophilic mixtures of latex particles at an air/water interface self-assemble, creating space filling, interconnected aggregates as the relative surface fractions of the dissimilar particles approach 0.5, which is reflected both in qualitative observation and fractal dimension of the microstructure. It is hypothesized that this change in microstructure occurs due to an asymmetry in the electrostatic interaction between similar and dissimilar particles caused by polarization of hydrophilic particles by hydrophobic particles. The changes in both microstructure and interparticle interactions significantly impact the interfacial viscoelasticity. As greater shape complexity is observed, interfacial complex moduli can increase by as much as 3 orders of magnitude and interfaces become more elastic.
UR - http://www.scopus.com/inward/record.url?scp=85072917573&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.9b02251
DO - 10.1021/acs.langmuir.9b02251
M3 - Article
C2 - 31539264
AN - SCOPUS:85072917573
SN - 0743-7463
VL - 35
SP - 13116
EP - 13125
JO - Langmuir
JF - Langmuir
IS - 40
ER -