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RETURN TO ISSUEPREVC: Physical Processe...C: Physical Processes in Nanomaterials and NanostructuresNEXT

Dynamic Coupling of Optically Evolved Assembling and Swarming of Gold Nanoparticles with Photothermal Local Phase Separation of Polymer Solution

Cite this: J. Phys. Chem. C 2020, 124, 30, 16604–16615
Publication Date (Web):June 30, 2020
Copyright © 2020 American Chemical Society

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    Abstract Image

    Optical trapping of gold nanoparticles (Au NPs) at a glass/solution interface initially generates a periodically aligned structure of a few NPs along the direction perpendicular to a linearly polarized laser. When the number of NPs was increased, this alignment was expanded to the outside of the irradiated focus, forming a single large assembly where the Au NPs dynamically fluctuated like a swarming of bees. The morphology was dumbbell-shape, consisting of two swarms at both sides of the focus, and its size reached about 10 μm. This optically evolved assembling and swarming was studied in poly(N-isopropylacrylamide) (PNIPAM) solution, where liquid–liquid phase separation (LLPS) was induced by photothermal heating of the trapped Au NPs forming a microdroplet of highly concentrated PNIPAM. Dynamic coupling of the NPs assembling and swarming with the droplet formation of PNIPAM leads to cooperative optical evolution, through which the assembly was embedded in the single microdroplet.

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    Supporting Information

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    • Scattering images of Au NP assembly; light scattering images of PS NPs assembly; plot showing the ratio of the size of the Au NPs assembly between x-direction elongation and y-direction elongation as a function of PNIPAM concentration (PDF)

    • Assembling and swarming dynamics of Au NPs at the surface of aqueous solutions with nothing, 18.8% w/w EG, and 1.75% w/w (5× speed) (AVI)

    • Assembling and swarming dynamics of Au NPs at the PNIPAM solution surface of 0, 0.01, 0.03, 0.1, 0.3, and 1.0% w/w (5× speed) (AVI)

    • Disappearing dynamics of swarming of Au NPs at the surface of aqueous solutions with nothing, 18.8% w/w EG, 0.01% w/w PNIPAM, and 1.0% w/w PNIPAM (normal speed) (AVI)

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