10.1021/acs.jpcc.9b05220.s001
Inseok Chae
Inseok
Chae
Dien Ngo
Dien
Ngo
Mohamadamin Makarem
Mohamadamin
Makarem
Zoubeida Ounaies
Zoubeida
Ounaies
Seong H. Kim
Seong H.
Kim
Compression-Induced Topographic Corrugation of Air/Surfactant/Water
Interface: Effect of Nanoparticles Adsorbed beneath the Interface
American Chemical Society
2019
Compression-Induced Topographic Corrugation
nanoparticle
Langmuir film
SFG
compression isotherm
2019-10-10 14:04:18
Dataset
https://acs.figshare.com/articles/dataset/Compression-Induced_Topographic_Corrugation_of_Air_Surfactant_Water_Interface_Effect_of_Nanoparticles_Adsorbed_beneath_the_Interface/9963743
The compression isotherm
of a Langmuir film can provide information
on the structural order and density of interfacial molecules. When
nanoparticles are introduced to the Langmuir film at an air/liquid
interface, the compression isotherm is altered substantially. In this
study, we report experimental evidence of topographic corrugation
of the air/surfactant/water interface due to compression of nanoparticles
adsorbed underneath the surfactant layer. A monolayer of cationic
surfactants is suspended in a Langmuir trough with negatively charged
nanoparticles in the aqueous subsurface. Changes in structural orders
of the interfacial molecules and nanoparticles were characterized
using in situ sum-frequency generation (SFG) spectroscopy during compression
and associated with the modified compression isotherm in the presence
of nanoparticles. This work elucidated changes in the compression
isotherm due to the variation of surface geometry, which is required
to produce a desired Langmuir film made of nanoparticles.