AI Article Synopsis
- Amphiphilic Janus nanosheets have a dual nature, with one side attracting water and the other repelling it, allowing them to assemble effectively at oil-water interfaces.
- During experiments, their behavior and the structure of the resulting particle film were studied, revealing how the nanosheets change under pressure when a probe is inserted.
- The findings showed that these nanosheets can alter the stiffness of the interface, making it more flexible, which allows for greater deformation with less applied pressure and offers insights into their interfacial properties and characterization methods.
Article Abstract
Hypothesis: Amphiphilic Janus nanosheets are plate-shaped, with one hydrophilic and one hydrophobic side; they are expected to assemble at oil-water interfaces. The assembled Janus nanosheets layers at the oil-water interface will exhibit a unique mechanical response under the vertical pressure of a probe.
Experiments: The interfacial behaviors of amphiphilic Janus nanosheets and the morphology of the assembled particle film at an oil-water interface were observed. The dynamic morphologies and force-displacement curves of the oil-water interface covered with amphiphilic Janus nanosheets were investigated during the insertion of a cylindrical probe.
Findings: Amphiphilic Janus nanosheets spontaneously aggregated at the oil-water interface. The morphology of the assembled particle film was controlled by the interfacial nanosheets concentration and can be divided into three regimes: unsaturated, monolayer, and collapsed. The wettability of the probe and the density of nanosheets at the interface played critical roles in the deformation and mechanical response of the oil-water interface under vertical pressure. The presence of amphiphilic Janus nanosheets reduced the stiffness and enhanced the flexibility and deformability of the oil-water interface. The oil-water interface covered with amphiphilic Janus nanosheets could produce larger deformation under a smaller vertical stress. This work not only improves the understanding of the interfacial properties of amphiphilic Janus nanosheets but also provides a method for characterizing nanoparticle layers at oil-water interfaces.
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| http://dx.doi.org/10.1016/j.jcis.2020.09.026 | DOI Listing |
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