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Real-Time Underwater Nanoplastic Detection beyond the Diffusion Limit and Low Raman Scattering Cross-Section via Electro-Photonic Tweezers
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Researchers developed an electro-photonic tweezer system using AC electro-osmotic flows and dielectrophoretic forces to actively concentrate and detect nanoplastics in real time underwater, overcoming detection limits posed by their tiny size and ultralow concentrations.
Emerging as substantial concerns in the ecosystem, submicron plastics have attracted much attention for their considerable hazards. However, their effect and even amount in the environment remain unclear. Establishing a substantive analytic platform is essential to expand the understanding of nanoplastics. However, the issues of diffusion and detection limit that arise from ultradiluted concentration and extremely small scales of nanoplastics leave significant technical hurdles to analyze the nanoplastic pollutants. In this study, we obtain effective Raman signals in real time from underwater nanoplastics with ultralow concentrations via AC electro-osmotic flows and dielectrophoretic tweezing. This enables the field-induced active collection of nanoplastics toward the optical sensing area from remote areas in a rapid manner, integrating conventional technical skills of preconcentration, separation, and identification in a single process. A step further, synergetic combination with plasmonic nanorods, accomplishes the highest on-site detection performance so far.
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Researchers used Raman tweezers - optical tweezers combined with Raman spectroscopy - to capture and chemically identify individual small microplastic and nanoplastic particles in seawater samples in situ. This novel technique could enable real-time identification of the smallest plastic particles in marine environments, filling a critical gap in nano- and micro-plastic detection.
Capturing, enriching and detecting nanoplastics in water based on optical manipulation, surface-enhanced Raman scattering and microfluidics
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Scientists built an optical manipulation and surface-enhanced Raman scattering system using gold nanoparticle stacks to simultaneously capture, enrich, and detect nanoplastics in natural water at concentrations as low as 150 ng/L for polystyrene, successfully quantifying nanoplastics across river, mariculture, and beach water samples. The technique fills a critical measurement gap for nanoplastics, enabling reliable concentration monitoring in environments where these particles are otherwise nearly impossible to detect and quantify.
Tracking nanoplastics in drinking water: a new frontier with the combination of dielectrophoresis and Raman spectroscopy
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Researchers developed a new combined technique using dielectrophoresis and Raman spectroscopy to detect and identify nanoplastics in drinking water. The method can trap and concentrate nanoplastic particles that are too small for conventional detection approaches, then chemically identify them. This advancement addresses a critical gap in our ability to monitor nanoscale plastic contamination in water supplies.
Detection of microplastics and nanoplastics: Are Raman tweezers and enhanced Raman methods the solution for sub 20 μm particles?
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Raman tweezers — devices that use a laser beam to trap and analyze individual particles — combined with plasmonic enhancement techniques can detect and characterize nanoplastics and microplastics smaller than 20 µm, a size range that defeats most conventional filtration-based detection methods. Improving detection sensitivity for the smallest plastic particles is critical because nanoplastics are thought to be the most biologically active fraction, capable of crossing cell membranes and accumulating in tissues.
Raman Tweezers for micro and nanoplastics analysis in watery ecosystems
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Raman Tweezers — instruments that combine laser trapping with Raman spectroscopy — were demonstrated as a powerful tool for identifying individual micro- and nanoplastic particles in water samples without physical contact. The technique can measure both the size and chemical composition of particles as small as nanometers, addressing a major gap in detection capabilities for nanoplastics. This analytical advance could enable more sensitive monitoring of the smallest plastic particles in aquatic environments.
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