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  4. Synergistic and competitive adsorption of hydrophilic nanoparticles and oil-soluble surfactants at the oil-water interface
 
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Synergistic and competitive adsorption of hydrophilic nanoparticles and oil-soluble surfactants at the oil-water interface

Citation Link: https://doi.org/10.15480/882.3593
Publikationstyp
Journal Article
Date Issued
2021-04-27
Sprache
English
Author(s)
Smits, Joeri  
Giri, Rajendra P.  
Shen, Chen  
Mendonça, Diogo  
Murphy, Bridget M.  
Huber, Patrick  orcid-logo
Rezwan, Kurosch  
Maas, Michael  
Institut
Material- und Röntgenphysik M-2  
TORE-DOI
10.15480/882.3593
TORE-URI
http://hdl.handle.net/11420/9720
Journal
Langmuir : the ACS journal of surfaces and colloids  
Volume
37
Issue
18
Start Page
5659
End Page
5672
Citation
Langmuir 37 (18): 5659-5672 (2021)
Publisher DOI
10.1021/acs.langmuir.1c00559
Scopus ID
2-s2.0-85106475749
PubMed ID
33905659
Publisher
ACS Pub
Fundamental insights into the interplay and self-assembly of nanoparticles and surface-active agents at the liquid-liquid interface play a pivotal role in understanding the ubiquitous colloidal systems present in our natural surroundings, including foods and aquatic life, and in the industry for emulsion stabilization, drug delivery, or enhanced oil recovery. Moreover, well-controlled model systems for mixed interfacial adsorption of nanoparticles and surfactants allow unprecedented insights into nonideal or contaminated particle-stabilized emulsions. Here, we investigate such a model system composed of hydrophilic, negatively, and positively charged silica nanoparticles and the oil-soluble cationic lipid octadecyl amine with in situ synchrotron-based X-ray reflectometry, which is analyzed and discussed jointly with dynamic interfacial tensiometry. Our results indicate that negatively charged silica nanoparticles only adsorb if the oil-water interface is covered with the positively charged lipid, indicating synergistic adsorption. Conversely, the positively charged nanoparticles readily adsorb on their own, but compete with octadecyl amine and reversibly desorb with increasing concentrations of the lipid. These results further indicate that with competitive adsorption, an electrostatic exclusion zone exists around the adsorbed particles. This prevents the adsorption of lipid molecules in this area, leading to a decreased surface excess concentration of surfactants and unexpectedly high interfacial tension.
DDC Class
530: Physik
600: Technik
Funding(s)
SFB 986: Teilprojekt B7 - Polymere in grenzflächenbestimmten Geometrien: Struktur, Dynamik und Funktion an planaren und in porösen Hybridsystemen  
Graduiertenkolleg 2462: Prozesse in natürlichen und technischen Partikel-Fluid-Systemen (PintPFS)  
Funding Organisations
Deutsche Forschungsgemeinschaft (DFG)  
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
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