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Synthesis, Functionalization, and Characterization of Fusogenic Porous Silicon Nanoparticles for Oligonucleotide Delivery
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Shape-engineered multifunctional porous silicon nanoparticles by direct imprinting.

Jeremy W Mares1, Joshua S Fain, Kelsey R Beavers

  • 1Department of Electrical Engineering and Computer Science, Vanderbilt University, Nashville, TN 37235, USA.

Nanotechnology
|June 18, 2015
PubMed
Summary

A new method fabricates custom-shaped mesoporous silicon particles for biomedical uses. This cost-effective technique offers a scalable alternative to traditional methods for producing nanoparticles.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Fabricating precisely shaped nanoparticles is crucial for advanced applications.
  • Existing methods for producing mesoporous silicon particles are often inefficient and costly.

Purpose of the Study:

  • To present a versatile and scalable method for fabricating shape-engineered mesoporous silicon particles.
  • To demonstrate the economic viability and efficiency of this novel fabrication technique.

Main Methods:

  • Utilized the direct imprinting of porous substrates (DIPS) technique with high-pressure imprintation (>200 MPa).
  • Incorporated electrochemical etching for sub-surface perforation and ultrasonication for particle release.
  • Validated particle fabrication for dimensions ranging from 100 nm to several micrometers.

Main Results:

  • Successfully generated mesoporous silicon particles (PSPs) in diverse geometries and sufficient quantities (≫10 μg) for biomedical applications.
  • Demonstrated the reusability of stamps (>150 times), highlighting the process's economic advantage over electron beam lithography and reactive ion etching.
  • Showcased the method's versatility by loading PSPs with a peptide nucleic acid drug and coating them with gold for photothermal applications.

Conclusions:

  • The DIPS technique offers an economical, efficient, and scalable approach for producing shape-engineered mesoporous silicon nanoparticles.
  • This method enables the customization of PSPs for various biomedical applications, including drug delivery and photothermal therapy.