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Continuous-Flow Flat Jet Setup for Uniform Pulsed Laser Postprocessing of Colloids.
Swen Zerebecki1,2, Sven Reichenberger1,2, Stephan Barcikowski1,2
1Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany.
The Journal of Physical Chemistry. A
|December 16, 2020
Summary
A novel flat jet design significantly improves pulsed laser postprocessing (PLPP) of nanoparticles. This advancement enables precise control over nanoparticle size and fragmentation, leading to narrower size distributions for enhanced material properties.
Area of Science:
- Materials Science
- Nanotechnology
- Laser Physics
Background:
- Pulsed laser postprocessing (PLPP) and laser fragmentation in liquid (LFL) are established methods for nanoparticle modification.
- Conventional cylindrical liquid jets in LFL exhibit intensity gradients, leading to broad size distributions and phase segregation.
- High-purity, continuous-flow conditions are crucial for controlled nanoparticle synthesis and modification.
Purpose of the Study:
- To introduce and evaluate a new flat jet design for LFL.
- To compare the performance of the flat jet with conventional cylindrical jets in terms of laser intensity uniformity and fragmentation control.
- To achieve a narrower product particle size distribution in nanoparticle fragmentation.
Main Methods:
- Development and implementation of a novel flat liquid jet setup for LFL.
- Comparative analysis of laser intensity distribution between flat and cylindrical liquid jets.
- Experimental determination of fragmentation thresholds for gold nanoparticles using both setups.
- Characterization of product nanoparticle size distribution.
Main Results:
- The flat jet design reduces laser intensity deviation by up to 10 times compared to cylindrical jets.
- Experimental fragmentation thresholds for gold nanoparticles align well with theoretical predictions using the flat jet.
- A narrow product size fraction of 3 ± 2 nm was achieved with the flat jet, compared to 10 ± 8 nm with the cylindrical jet.
- The flat jet enables precise nanoparticle fragmentation at single pulse per particle conditions, even at high concentrations (>50 mg L⁻¹).
Conclusions:
- The flat jet setup offers superior control and precision for laser fragmentation of nanoparticles in liquid.
- This design overcomes limitations of cylindrical jets, enabling more accurate studies of fragmentation mechanisms.
- The flat jet is a promising tool for producing nanoparticles with narrow size distributions and has potential applications in other PLPP disciplines.
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