In-situ study of the impact of temperature and architecture on the interfacial structure of microgels
Bochenek, Steffen ; Camerin, Fabrizio LU
; Zaccarelli, Emanuela
; Maestro, Armando
; Schmidt, Maximilian M.
; Richtering, Walter
and Scotti, Andrea
LU
(2022)
In Nature Communications
13(1).
- Abstract
The structural characterization of microgels at interfaces is fundamental to understand both their 2D phase behavior and their role as stabilizers that enable emulsions to be broken on demand. However, this characterization is usually limited by available experimental techniques, which do not allow a direct investigation at interfaces. To overcome this difficulty, here we employ neutron reflectometry, which allows us to probe the structure and responsiveness of the microgels in-situ at the air-water interface. We investigate two types of microgels with different cross-link density, thus having different softness and deformability, both below and above their volume phase transition temperature, by combining experiments with computer... (More)
The structural characterization of microgels at interfaces is fundamental to understand both their 2D phase behavior and their role as stabilizers that enable emulsions to be broken on demand. However, this characterization is usually limited by available experimental techniques, which do not allow a direct investigation at interfaces. To overcome this difficulty, here we employ neutron reflectometry, which allows us to probe the structure and responsiveness of the microgels in-situ at the air-water interface. We investigate two types of microgels with different cross-link density, thus having different softness and deformability, both below and above their volume phase transition temperature, by combining experiments with computer simulations of in silico synthesized microgels. We find that temperature only affects the portion of microgels in water, while the strongest effect of the microgels softness is observed in their ability to protrude into the air. In particular, standard microgels have an apparent contact angle of few degrees, while ultra-low cross-linked microgels form a flat polymeric layer with zero contact angle. Altogether, this study provides an in-depth microscopic description of how different microgel architectures affect their arrangements at interfaces, and will be the foundation for a better understanding of their phase behavior and assembly.
(Less)
- author
- Bochenek, Steffen
; Camerin, Fabrizio
LU
; Zaccarelli, Emanuela
; Maestro, Armando
; Schmidt, Maximilian M.
; Richtering, Walter
and Scotti, Andrea
LU
- publishing date
- 2022-12
- type
- Contribution to journal
- publication status
- published
- in
- Nature Communications
- volume
- 13
- issue
- 1
- article number
- 3744
- publisher
- Nature Publishing Group
- external identifiers
-
- pmid:35768399
- scopus:85133131412
- ISSN
- 2041-1723
- DOI
- 10.1038/s41467-022-31209-3
- language
- English
- LU publication?
- no
- additional info
- Publisher Copyright: © 2022, The Author(s).
- id
- a01f6a77-b591-4ee4-92b1-21380d4a2f2e
- date added to LUP
- 2024-02-22 14:08:18
- date last changed
- 2024-04-22 00:07:02
@article{a01f6a77-b591-4ee4-92b1-21380d4a2f2e,
abstract = {{<p>The structural characterization of microgels at interfaces is fundamental to understand both their 2D phase behavior and their role as stabilizers that enable emulsions to be broken on demand. However, this characterization is usually limited by available experimental techniques, which do not allow a direct investigation at interfaces. To overcome this difficulty, here we employ neutron reflectometry, which allows us to probe the structure and responsiveness of the microgels in-situ at the air-water interface. We investigate two types of microgels with different cross-link density, thus having different softness and deformability, both below and above their volume phase transition temperature, by combining experiments with computer simulations of in silico synthesized microgels. We find that temperature only affects the portion of microgels in water, while the strongest effect of the microgels softness is observed in their ability to protrude into the air. In particular, standard microgels have an apparent contact angle of few degrees, while ultra-low cross-linked microgels form a flat polymeric layer with zero contact angle. Altogether, this study provides an in-depth microscopic description of how different microgel architectures affect their arrangements at interfaces, and will be the foundation for a better understanding of their phase behavior and assembly.</p>}},
author = {{Bochenek, Steffen and Camerin, Fabrizio and Zaccarelli, Emanuela and Maestro, Armando and Schmidt, Maximilian M. and Richtering, Walter and Scotti, Andrea}},
issn = {{2041-1723}},
language = {{eng}},
number = {{1}},
publisher = {{Nature Publishing Group}},
series = {{Nature Communications}},
title = {{In-situ study of the impact of temperature and architecture on the interfacial structure of microgels}},
url = {{http://dx.doi.org/10.1038/s41467-022-31209-3}},
doi = {{10.1038/s41467-022-31209-3}},
volume = {{13}},
year = {{2022}},
}