Details
| Original language | English |
|---|---|
| Number of pages | 23 |
| Publication status | E-pub ahead of print - 24 Apr 2023 |
Abstract
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2023.
Research output: Working paper/Preprint › Working paper/Discussion paper
}
TY - UNPB
T1 - Discovery of Non-Classical Self-Assembly in Janus Particle-Based Surfactants and the Field-Triggered Breakdown of Surface Activity and Amphiphilic Properties
AU - Lanz, Cornelia
AU - Krysiak, Yasar
AU - Liu, Xu
AU - Hohgardt, Manuel
AU - Walla, Peter Jomo
AU - Polarz, Sebastian
N1 - Acknowledgment: Analytical measurements were performed in the central analytical facility cfMATCH.
PY - 2023/4/24
Y1 - 2023/4/24
N2 - The use of colloidal particles as models to understand processes on a smaller size-scale is a highly valuable approach. Compared to molecules, particles are less defined but their architecture can be more complex, so is their long-range interaction. Sometimes one can observe phenomena which are unknown or much more difficult to realize on the molecular level. The current paper focuses on particle-based surfactants and reports about numerous unexpected properties. The main goal is the creation of an amphiphilic system with responsiveness in surface activity and associated self-organization phenomena depending on the application of an external trigger, preferably a physical field. A key step is the creation of a Janus-type particle characterized by two types of dipoles (electric and magnetic) which geometrically stand orthogonal to each other. In a field, one can control which contribution and which direction dominates the inter-particle interactions and as a result one can change the properties of the system drastically. The features of ferrite-core organosilica-shell particles with grain-like morphology modified by click chemistry is studied in response to spatially isotropic and anisotropic triggers. A highly unusual aggregation-dissolution-reaggregation sequence was discovered. Using a magnetic field, one can even switch off the amphiphilic properties and use this for the field-triggered breaking of multiphase systems such as emulsions.
AB - The use of colloidal particles as models to understand processes on a smaller size-scale is a highly valuable approach. Compared to molecules, particles are less defined but their architecture can be more complex, so is their long-range interaction. Sometimes one can observe phenomena which are unknown or much more difficult to realize on the molecular level. The current paper focuses on particle-based surfactants and reports about numerous unexpected properties. The main goal is the creation of an amphiphilic system with responsiveness in surface activity and associated self-organization phenomena depending on the application of an external trigger, preferably a physical field. A key step is the creation of a Janus-type particle characterized by two types of dipoles (electric and magnetic) which geometrically stand orthogonal to each other. In a field, one can control which contribution and which direction dominates the inter-particle interactions and as a result one can change the properties of the system drastically. The features of ferrite-core organosilica-shell particles with grain-like morphology modified by click chemistry is studied in response to spatially isotropic and anisotropic triggers. A highly unusual aggregation-dissolution-reaggregation sequence was discovered. Using a magnetic field, one can even switch off the amphiphilic properties and use this for the field-triggered breaking of multiphase systems such as emulsions.
U2 - 10.26434/chemrxiv-2023-p8mb4
DO - 10.26434/chemrxiv-2023-p8mb4
M3 - Working paper/Discussion paper
BT - Discovery of Non-Classical Self-Assembly in Janus Particle-Based Surfactants and the Field-Triggered Breakdown of Surface Activity and Amphiphilic Properties
ER -