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Papers
61,005 resultsShowing papers similar to Estimating the velocity of chemically-driven Janus colloids considering the anisotropic concentration field
ClearOrbits, spirals, and trapped states: Dynamics of a phoretic Janus particle in a radial concentration gradient
Researchers developed a theoretical description of the motion of a spherical phoretic Janus particle in a radial concentration gradient of chemical solute driving self-propulsion, deriving analytical solutions for particle velocity. The study characterized distinct dynamic states including orbits, spirals, and trapped configurations, with implications for understanding active colloidal matter behavior near chemical point sources or sinks.
Ionic Diffusiophoresis of Active Colloids via Galvanic Exchange Reactions
This study investigates ionic diffusiophoresis of active colloids that undergo galvanic exchange reactions, exploring how chemical gradients drive directed particle motion in electrolyte solutions; the work is relevant to nano-scale transport physics rather than microplastic ecology.
Active colloids orbiting giant vesicles
Scientists observed that self-propelled colloidal particles persistently orbit around lipid membrane vesicles in water. This soft matter physics research could contribute to understanding how active micro-scale particles, including some plastic fragments, interact with biological membranes.
Review: Interactions of Active Colloids with Passive Tracers
This review examines how self-propelled particles (active colloids) interact with passive objects in their environment, drawing parallels between artificial systems and biological ones like bacteria. The findings have relevance for understanding how microplastics may be transported or aggregated by microorganisms in water.
Mixing and unmixing induced by active camphor particles
Scientists used self-propelled camphor particles on water to study how tiny floating objects are mixed or separated by active swimmers. This fluid physics research has implications for understanding how microplastic particles are distributed and mixed in water bodies with current and biological activity.
Comprehensive Understanding of Self-Propelled Janus Pt/Fe2O3 Micromotor Dynamics: Impact of Size, Morphology, and Surface Structure
Researchers systematically varied the size, morphology, and surface structure of self-propelled Janus Pt/Fe2O3 hematite-based micromotors by modifying synthesis methods, comparing propulsion speeds to elucidate the mechanisms governing micromotor dynamics and develop more efficient devices for capturing and removing microplastics from aquatic environments.
A scalable method to model large suspensions of colloidal phoretic particles with arbitrary shapes
Researchers developed a computationally efficient framework for simulating large numbers of self-propelling microscopic particles that move via chemical gradients, enabling more realistic modeling of collective behavior in synthetic micro-swimmers — relevant for designing drug delivery systems and understanding microorganism movement.
Driven Engulfment of Janus Particles by Giant Vesicles in and out of Thermal Equilibrium
Researchers studied how Janus particles — small particles with two distinct surfaces — interact with and become engulfed by lipid vesicles, which are used as models for cell membranes. The findings are relevant for understanding how microparticles may interact with biological membranes in living organisms.
Janus particles: from concepts to environmentally friendly materials and sustainable applications
This review covers Janus particles — asymmetric particles with two distinct chemical or physical faces — examining their synthesis, self-assembly properties, and emerging environmental and industrial applications including use as safer surfactant alternatives.
Diffusiophoresis: a novel transport mechanism - fundamentals, applications, and future opportunities
This paper is not primarily about microplastics. It reviews diffusiophoresis, a physical transport mechanism where particles move in response to chemical concentration gradients, covering both fundamental science and applications in water filtration, drug delivery, and biological systems. While the removal of microplastics is briefly mentioned as one potential application of active diffusiophoresis, the paper is a broad physics review rather than a study of microplastic pollution.
Distinct dynamics of self-propelled bowl-shaped micromotors caused by shape effect: Concave vs convex
This study compared the movement dynamics of two bowl-shaped micromotors with platinum catalysts on their concave versus convex surfaces, finding that surface geometry significantly influences bubble formation and propulsion speed. Self-propelled micromotors are being explored for potential applications including targeted removal of pollutants like microplastics from water.
Microfluidic Methods in Janus Particle Synthesis
This review examines microfluidic-based methods for synthesizing Janus particles -- asymmetric particles with two distinct surface chemistries -- highlighting how these techniques offer superior control over reaction conditions, rapid prototyping, and low reagent consumption compared to conventional synthesis methods.
Diffusiophoretic transport of colloids in porous media
This study is not primarily about microplastics; it investigates how chemical gradients (diffusiophoresis) change how colloidal particles move through porous media in general. Microplastic remediation is mentioned as one potential application area, but the work is fundamentally a fluid physics study.
Transport of nanoplastics in saturated iron oxide-coated gravel: Effects of flow velocity, ionic strength and surface property of nanoplastics
Researchers investigated nanoplastic transport through saturated iron oxide-coated gravel by varying flow velocity, ionic strength, and surface properties, finding that higher flow rates promoted nanoplastic transport, while ionic strength had opposing effects on negatively and positively charged particles depending on their surface chemistry.
In Vivo Chemotaxis System with Ultra-High Ionic Tolerance
Researchers developed a chemotactic drug delivery system based on inducible nitric oxide synthase and arginine that maintains efficient directional motion in physiological high-ionic-strength environments, using mesoscale simulations to reveal a thermally enhanced self-electrophoresis mechanism that does not depend on structural asymmetry.
Self-Propelled Janus Microdimer Swimmers under a Rotating Magnetic Field
Researchers designed self-propelling microscopic swimmers powered by rotating magnetic fields, with potential uses in medicine and environmental monitoring. While not directly about microplastics, this micro-robotics technology could eventually be applied to detecting or removing contaminants at the microscale.
Dynamics of Colloids at Equilibrium and Thermal Non-equilibrium: From Microrheology to Environmental Sensing
This thesis is not primarily about microplastics; it investigates the general dynamics of colloidal particles — both at equilibrium (Brownian motion, self-assembly) and under thermal gradients — with applications in microrheology and biochemical sensing. Microplastic detection is not a focus of the work.
An efficient strategy to separate nanoplastics from water using anisotropic magnetic Janus particles
Researchers developed amphiphilic magnetic Janus particles that selectively capture nanoplastics from water, achieving capture capacities of 10.3-19.2 mg/g — approximately 4-7 times higher than conventional magnetic particles. The anisotropic design leverages hydrophobic-hydrophilic surface asymmetry to enhance nanoplastic affinity, offering an efficient approach for drinking water treatment.
Repulsions and attractions between membrane-deforming spheres, Janus-particles, and opposite tube-like deformations in giant unilamellar vesicles
Researchers experimentally and theoretically investigated interactions between membrane-deforming particles in giant unilamellar vesicles, finding that particles inducing opposite-direction membrane deformations exhibit repulsion-to-attraction transitions—a finding relevant to understanding how microplastics and nanoparticles interact with cell membranes.
Self-driven magnetorobots for recyclable and scalable micro/nanoplastic removal from nonmarine waters
Researchers developed self-driven magnetorobots using magnetizable ion-exchange resin spheres that can dynamically remove micro- and nanoplastics from nonmarine waters, overcoming limitations of conventional chemical flocculation and physical filtration methods.
Self-propelled micro/nanomotors for removal of insoluble water contaminants: microplastics and oil spills
This frontier review examines the capabilities of self-propelled micro/nanomotors for removing oil spills and plastic-based pollutants from water, discussing working mechanisms, current limitations, and future research directions for deploying these autonomous systems in environmental remediation.
Sedimentation and shear-induced dynamics of spheroids in fluids with spatial viscosity variations
Researchers used a generalized reciprocal theorem approach to analytically model how spheroid-shaped particles—relevant to elongated microplastics—settle and rotate in viscosity-stratified fluids. The analysis provides theoretical predictions for how viscosity gradients in natural water columns affect the transport dynamics of non-spherical microplastic particles.
A Self-Regulating Shuttle for Autonomous Seek and Destroy of Microplastics from Wastewater
Researchers developed a buoyancy-driven hybrid hydrogel that functions as a self-regulating shuttle for autonomous microplastic removal from wastewater, using thermally switchable buoyancy to cyclically transport captured contaminants from the seabed to the water surface for photocatalytic degradation without external intervention.
Sorting of heterogeneous colloids by AC-dielectrophoretic forces in a microfluidic chip with asymmetric orifices
Researchers demonstrated that AC dielectrophoretic forces in a microfluidic chip with asymmetric orifices can sort heterogeneous colloidal particles — including Janus particles and intact versus broken dumbbells — based on composition-dependent differences in their response to electric field gradients.