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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Plasmon-actuated nano-assembled microshells.

Makiko T Quint1, Som Sarang1, David A Quint1,2

  • 1School of Natural Sciences, University of California, Merced, CA, 95344, USA.

Scientific Reports
|December 21, 2017
PubMed
Summary

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This summary is machine-generated.

We developed novel gold nanoparticle (AuNP) microshells for controlled cargo release. These stable shells rupture with low-power light, offering efficient and safe delivery for various applications.

Area of Science:

  • Nanotechnology and Materials Science
  • Plasmonics and Photothermal Applications
  • Biotechnology and Drug Delivery

Background:

  • Development of stable, controllable nano-containers for cargo encapsulation and release.
  • Limitations of existing plasmon-actuated systems regarding power requirements and heat generation.

Purpose of the Study:

  • To create three-dimensional microshells from self-assembled gold nanoparticles (AuNPs).
  • To achieve controlled, low-power, rapid cargo release using photothermal effects.
  • To investigate the safety and efficiency of these microshells for potential biological applications.

Main Methods:

  • Self-assembly of 5 nm AuNPs functionalized with mesogenic molecules to form stable microshells.
  • Encapsulation of cargo with minimal leakage over extended periods.

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  • Optical excitation at low power (<2 mW) to trigger shell rupture and cargo release (<5 s).
  • Small angle x-ray spectroscopy (SAXS) to analyze AuNP packing and photothermal heating simulations.

    • Main Results:

    • Formation of stable, rigid microshells capable of long-term, virtually leakage-free cargo containment.
    • Controllable and rapid cargo release (<5 s) triggered by ultralow power optical excitation.
    • Minimal local heating (<50 °C) during photothermal actuation, addressing a key limitation in plasmonic systems.
    • Accurate simulation of temperature increase based on AuNP packing and photothermal heating.

    Conclusions:

    • Hierarchical AuNP microshells offer a versatile platform for controlled cargo delivery.
    • The system demonstrates spectral selectivity, low power needs, minimal heat production, and fast release kinetics.
    • These properties make the microshells highly suitable for diverse applications, including sensitive biological ones.