Journal
NANO LETTERS
Volume 17, Issue 11, Pages 6855-6862Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b03159
Keywords
Dynamics; interfacial jamming; X-ray photon correlation spectroscopy; nanoparticle
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division within the Adaptive Interfacial Assemblies Towards Structuring Liquids program [DE-AC02-05-CH11231, KCTR16]
- U.S. Department of Energy Office of Basic Energy Science [DE-FG02-04ER46126]
- [NSF-CHE-1506839]
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Nanoparticles (NPs) segregated to the liquid/liquid interface form disordered or liquid-like assemblies that show diffusive motions in the plane of the interface. As the areal density of NPs at the interface increases, the available interfacial area decreases, and the interfacial dynamics of the NP assemblies change when the NPs jam. Dynamics associated with jamming was investigated by X-ray photon correlation spectroscopy. Water-in-toluene emulsions, formed by a self-emulsification at the liquid/liquid interface and stabilized by ligand-capped CdSe-ZnS NPs, provided a simple, yet powerful platform, to investigate NP dynamics. In contrast to a single planar interface, these emulsions increased the number of NPs in the incident beam and decreased the absorption of X-rays in comparison to the same path length in pure water. A transition from diffusive to confined dynamics was manifested by intermittent dynamics, indicating a transition from a liquid-like to a jammed state.
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