Title

Activation and Assembly of Plasmonic-Magnetic Nanosurfactants for Encapsulation and Triggered Release

Publication Date

11-13-2020

Department

Materials Science and Engineering; Industrial and Manufacturing Systems Engineering; Ames Laboratory

Campus Units

Industrial and Manufacturing Systems Engineering, Materials Science and Engineering, Ames Laboratory

Report Number

IS-J 10392

DOI

10.1021/acs.nanolett.0c03641

Journal Title

Nano Letters

Volume Number

20

Issue Number

12

First Page

8773

Last Page

8780

Abstract

Multifunctional surfactants hold great potentials in catalysis, separation, and biomedicine. Highly active plasmonic-magnetic nanosurfactants are developed through a novel acid activation treatment of Au–Fe3O4 dumbbell nanocrystals. The activation step significantly boosts nanosurfactant surface energy and enables the strong adsorption at interfaces, which reduces the interfacial energy one order of magnitude. Mediated through the adsorption at the emulsion interfaces, the nanosurfactants are further constructed into free-standing hierarchical structures, including capsules, inverse capsules, and two-dimensional sheets. The nanosurfactant orientation and assembly structures follow the same packing parameter principles of surfactant molecules. Furthermore, nanosurfactants demonstrate the capability to disperse and encapsulate homogeneous nanoparticles and small molecules without adding any molecular surfactants. The assembled structures are responsive to external magnetic field, and triggered release is achieved using an infrared laser by taking advantage of the enhanced surface plasmon resonance of nanosurfactant assemblies. Solvent and pH changes are also utilized to achieve the cargo release.

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

2020-JiangShan-ActivationAssembly-SI.pdf (2133 kB)
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