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Related Concept Videos

Mass Analyzers: Overview01:13

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Plasmonic Brownian Ratchets for Directed Transport of Analytes.

Marciano Palma do Carmo1, David Mack2, Diane J Roth1

  • 1Physics Department, King's College London, London WC2R 2LS, U.K.

Nano Letters
|November 26, 2025
PubMed
Summary

This study introduces a plasmonic Brownian ratchet for directed nanoparticle transport. The device rectifies colloidal diffusion using an asymmetric gold nanoarray, achieving efficient nanoscale manipulation.

Keywords:
Brownian ratchetsanalyte motionoptical trappingplasmonics

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Area of Science:

  • Nanophotonics
  • Optical manipulation
  • Colloidal science

Background:

  • Plasmonic nanostructures generate strong optical near-fields for particle manipulation.
  • Achieving robust, directional transport from these interactions remains a challenge.

Purpose of the Study:

  • To demonstrate a plasmonic Brownian ratchet for rectifying colloidal diffusion.
  • To enable efficient, unidirectional transport of nanosized particles.

Main Methods:

  • Utilizing an asymmetric gold nanoarray under continuous-wave illumination.
  • Employing finite-element simulations to analyze near-field distributions and optical forces.
  • Conducting experiments with various nanoparticle compositions (40-200 nm).

Main Results:

  • Demonstrated directed motion of dielectric, semiconducting, and metallic nanoparticles.
  • Achieved unidirectional lateral transport with velocities up to 2.4 μm/s.
  • Operated effectively at incident intensities below 1 kW/cm².

Conclusions:

  • Plasmonic ratcheting offers an efficient method for biasing nanosized analyte transport.
  • This approach surpasses previous optical ratchets in speed and power efficiency.
  • Opens avenues for integration into nanophotonic and lab-on-chip systems.