High‐Performance MXene Hydrogel for Self‐Propelled Marangoni Swimmers and Water‐Enabled Electricity Generator

Advanced Science, Journal Year: 2024, Volume and Issue: 12(2)

Published: Nov. 18, 2024

Abstract Developing multifunctional materials that integrate self‐propulsion and self‐power generation is a significant challenge. This study introduces high‐performance MXene‐chitosan composite hydrogel (CM) successfully combines these functionalities. Utilizing Schiff base bond hydrogen interactions, the CM hydrogel, composed of chitosan, vanillin, MXene, achieves exceptional on water driven by Marangoni forces. The demonstrates rapid movement, extended operation, controllable trajectories. Notably, also exhibits superior degradability, recyclability, repeatability. Furthermore, nano‐confined channels within play crucial role in enhancing its water‐enabled electricity (WEG) performance. By efficiently adsorbing molecules selectively transporting cations through channels, can generate from more efficiently. As result, CM‐WEG stable open‐circuit voltage up to 0.83 V short‐circuit current 0.107 mA seawater, with further improvements K 2 CO 3 ‐containing water, reaching 1.26 0.922 mA. Leveraging unique combination WEG functionalities, used for cargo delivery while simultaneously powering electronic devices. research represents step toward development self‐powered, autonomous soft robotics, opening new directions field.

Language: Английский

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Highly‐Adaptable Optothermal Nanotweezers for Trapping, Sorting, and Assembling across Diverse Nanoparticles

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(9)

Published: Nov. 10, 2023

Optical manipulation of various kinds nanoparticles is vital in biomedical engineering. However, classical optical approaches demand higher laser power and are constrained by diffraction limits, necessitating tailored trapping schemes for specific nanoparticles. They lack a universal biocompatible tool to manipulate diverse sizes, charges, materials. Through precise modulation diffusiophoresis thermo-osmotic flows the boundary layer an optothermal-responsive gold film, highly adaptable optothermal nanotweezers (HAONTs) capable manipulating single nanoparticle as small sub-10 nm designed. Additionally, novel doughnut-shaped vortex (DSV) strategy introduced, enabling new mode physical interaction between cells Furthermore, this versatile approach allows organic, inorganic, biological forms. It also offers function modes such trapping, sorting, assembling believed that holds potential be valuable fields synthetic biology, optofluidics, nanophotonics, colloidal science.

Language: Английский

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External power-driven micro/nanorobots: Design, fabrication, and functionalization for tumor diagnosis and therapy

Progress in Materials Science, Journal Year: 2023, Volume and Issue: 140, P. 101204 - 101204

Published: Oct. 9, 2023

Language: Английский

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Power Micromachines With Light

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 29, 2024

Abstract Optical manipulation technology encompasses a suite of micromanipulation techniques that employ light to control and actuate microscopic objects. As valuable scientific tool, optical is employed by researchers investigate fundamental biological processes, examine the mechanics microstructures, develop innovative technologies with applications in diagnostics, imaging, micro‐scale manufacturing. The rapid development technology, combined advanced microfabrication techniques, has catalyzed emergence burgeoning research domain termed optically‐driven micromachinery. This rapidly expanding field garnered significant interest recent years, fostering interdisciplinary collaboration across manufacturing, materials science, biotechnology, micro‐electromechanical systems. capability optically manipulate micromachines also opens new avenues for tools, sensors, devices enhanced functionalities, enabling accomplishment tasks previously considered impossible. review presents systematic overview two important technologies, tweezers optoelectronic tweezers, focus on their A comparative analysis conducted, accompanied discussion strategies further enhance performance, paving way more powerful micromachinery future.

Language: Английский

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Optimizing Light Pattern Curvature to improve the performance of Optoelectronic Tweezers in micromanipulation

Optics Express, Journal Year: 2025, Volume and Issue: 33(2), P. 2968 - 2968

Published: Jan. 10, 2025

Optoelectronic tweezers (OET) offer a versatile, programmable, and contactless method for manipulating microscale objects. While factors like AC voltage light intensity have been extensively studied, the role of pattern curvature in performance OET manipulation remains underexplored. This study investigates how patterns affects movement polystyrene microparticles under negative dielectrophoretic (DEP) forces an system. Experimental results show that as decreases, maximum velocity first increases to peak then gradually decreases. Numerical simulations reveal significantly influences horizontal vertical DEP forces, altering equilibrium positions velocities. By defining optimal (χ, ratio microparticle diameter inner pattern), we found achieve stability at this regardless sizes. These findings key insights into optimizing improved performance, facilitating more precise efficient applications micromanipulation, micro-assembly, microfabrication, beyond.

Language: Английский

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Reconfigurable Transport and Assembly of Colloidal Particles via Opto-Chemical-Electronic Tweezer (OCET)

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 22, 2025

Transporting and assembling colloidal particles is key to applications such as drug delivery, the fabrication of functional materials, microrobotics. As a result, there intense effort in developing techniques for manipulating colloids at high spatial temporal resolutions, dynamic, reconfigurable manner. Although optical manipulation provides precise particle control, its application often limited by energy requirements intricate setups. In this study, we present an opto-chemical-electronic tweezer (OCET), novel strategy that addresses these limitations. The OCET system utilizes photocatalytic TiO2/Pt film irradiated with perpendicular UV light. An electric field then generated parallel boundary patterned light, directed from illuminated region dark region. consequent electrophoresis electroosmosis work tandem move inert (e.g., SiO2 microspheres) ∼1 μm/s trap them few μm inside along light pattern. By dynamically modulating patterns, achieves directional transport assembly into arbitrary patterns. holds promise optofluidics, micro/nanorobotics, biomedical systems, setting stage further advancements technologies.

Language: Английский

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Automated and collision-free navigation of multiple micro-objects in obstacle-dense microenvironments using optoelectronic tweezers

Microsystems & Nanoengineering, Journal Year: 2025, Volume and Issue: 11(1)

Published: March 17, 2025

Abstract Automated parallel manipulation of multiple micro-objects with optoelectronic tweezers (OET) has brought significant research interests recently. However, the objects in complex obstacle-dense microenvironment using OET technology based on negative dielectrophoresis (nDEP) remain a big technical challenge. In this work, we proposed an adaptive light pattern design strategy to achieve automated and navigate them through obstacles target positions high precision no collision. We first developed multi-micro-object system, capable simultaneous image processing microparticles path planning. To overcome microparticle collisions caused by overlapping patterns, employed novel that can dynamically adjust layout patterns according surrounding environment, ensuring enough space for each preventing unintended escapes from trap. The efficacy approach been verified systematic simulations experiments. Utilizing strategy, polystyrene were autonomously navigated microchannels their intended destinations, demonstrating strategy’s effectiveness potential micromanipulation confined microenvironments.

Language: Английский

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Particle‐Assisted Optoelectronic Tweezers for Manipulating Single Cells and Microparticles

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

Abstract Manipulation of single cells or particles is crucial in the biomedical field. However, precisely and rapidly manipulating without damaging them a significant challenge. In this study, novel strategy for indirect manipulation microparticles that can satisfy these requirements via combination particle‐induced dielectrophoretic forces (PiDEP) optoelectronic tweezers (OET) developed. This based primarily on principle experiencing same tend to repel each other, whereas those different are attracted other. During manipulation, Ag‐SiO 2 controlled by OET act as intermediaries other through forces. Thus, range be expanded two three times its original size, speed significantly increased while maintaining precision. Furthermore, results indicate proposed method effectively reduce cell damage one‐third caused traditional OET. study demonstrates potential particle‐assisted single‐cell offers an effective microparticles.

Language: Английский

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Dielectrophoretic Colloidal Levitation by Electrode Polarization in Oscillating Electric Fields

Langmuir, Journal Year: 2023, Volume and Issue: 39(19), P. 6932 - 6945

Published: May 6, 2023

Controlled colloidal levitation is key to many applications. Recently, it was discovered that polymer microspheres were levitated a few micrometers in aqueous solutions alternating current (AC) electric fields. A mechanisms have been proposed explain this AC such as electrohydrodynamic flows, asymmetric rectified fields, and aperiodic electrodiffusiophoresis. Here, we propose an alternative mechanism based on dielectrophoresis spatially inhomogeneous field gradient extending from the electrode surface into bulk. This derived polarization, where counterions accumulate near surfaces. dielectric microparticle then height dielectrophoretic lift balances gravity. The supported by two numerical models. One model assumes point dipoles solves for Poisson-Nernst-Planck equations, while second incorporates sphere of realistic size permittivity uses Maxwell-stress tensor formulation solve electrical body force. In addition proposing plausible mechanism, further demonstrate can be used move synthetic microswimmers controlled heights. study sheds light understanding dynamics particles paves way using manipulate particles, active or passive.

Language: Английский

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Orbits, Spirals, and Trapped States: Dynamics of a Phoretic Janus Particle in a Radial Concentration Gradient

ACS Nano, Journal Year: 2024, Volume and Issue: 18(34), P. 23047 - 23057

Published: Aug. 13, 2024

A long-standing goal in colloidal active matter is to understand how gradients fuel concentration influence the motion of phoretic Janus particles. Here, we present a theoretical description spherical particle presence radial gradient chemical solute driving self-propulsion. Radial are geometry relevant many scenarios systems and naturally arise due point source or sink fuel. We derive an analytical solution for particle's velocity quantify on trajectory. Compared linear concentration, uncover much richer set dynamic behaviors including circular orbits trapped stationary states. identify ratio mobilities between two domains as central quantity tuning their dynamics. Our results provide path developing optimum protocols dynamics particles mixing fluid at microscale. In addition, this work suggests method quantifying surface properties particles, which have proven be challenging probe experimentally.

Language: Английский

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