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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
565

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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
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Boosting Upconversion Efficiency in Optically Inert Shelled Structures with Electroactive Membrane through Electron

Liu-Chun Wang1,2, Hong-Kai Chen3, Wen-Jyun Wang4

  • 1Department of Chemistry, National Cheng Kung University, Tainan, 701, Taiwan.

Advanced Materials (Deerfield Beach, Fla.)
|May 10, 2024
PubMed
Summary
This summary is machine-generated.

Researchers enhanced lanthanide-based nanoparticle (UCNP) upconversion efficiency using electroactive membranes from Shewanella oneidensis MR-1. This novel approach boosts luminescence via extracellular electron transfer, bypassing traditional sensitization methods.

Keywords:
Shewanella oneidensis MR‐1density functional theoryliposome fusion‐induced membrane exchangemembrane‐integrated liposomeupconversion nanoparticle

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Area of Science:

  • Nanotechnology
  • Biophysics
  • Materials Science

Background:

  • Lanthanide-based nanoparticles (UCNPs) are crucial for bioimaging and sensing, but their upconversion efficiency is often limited.
  • Traditional methods to enhance UCNP efficiency involve ligand sensitization, which can be complex and less effective.
  • Developing novel strategies for efficient UCNP luminescence is essential for advancing biological applications.

Purpose of the Study:

  • To develop a new method for enhancing UCNP upconversion efficiency using bio-derived electroactive membranes.
  • To investigate the mechanism of electron transfer from bacterial membranes to UCNPs for luminescence enhancement.
  • To demonstrate the potential of this UCNP@MIL construct for biological applications, such as cell imaging.

Main Methods:

  • Extraction of electroactive membranes rich in c-type cytochromes from Shewanella oneidensis MR-1.
  • Integration of these membranes into liposomes encapsulating core-shelled UCNPs (UCNP@MIL constructs).
  • Characterization of upconversion luminescence enhancement under near-infrared excitation and investigation of electron transfer mechanisms using DFT calculations.

Main Results:

  • UCNP@MIL constructs exhibited significantly enhanced upconversion luminescence, driven by electron donation from the electroactive membrane.
  • Density functional theory calculations confirmed efficient electron transfer, with the membrane's HOMO level exceeding the shell's VBM.
  • Luminescence enhancement was independent of emitter/sensitizer ions but dependent on the inert shell and electron transfer pathway, with SiO2 coating reducing enhancement.

Conclusions:

  • Extracellular electron transfer from bacterial electroactive membranes provides a novel and effective pathway to enhance UCNP upconversion efficiency.
  • The UCNP@MIL system offers a robust and versatile platform for UCNP-based technologies, particularly in biological applications due to improved cellular uptake.