Microparticle manipulation using laser-induced thermophoresis and thermal convection flow

Yang, Qian; Neale, Steven L.; Marsh, J.H.

doi:10.1038/s41598-020-76209-9

Cited by 22 publications

(15 citation statements)

References 53 publications

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“…When particle assembly is induced by the synergy of natural convection and positive thermophoresis (i.e., moving away from the heating source), ring-shaped colloidal assemblies can be obtained due to the counterbalance between thermophoretic force and Stokes drag force induced by the natural convection (Figure a). ,,− Flores-Flores et al further demonstrated the transition from integral assembled structures to ring-shaped ones by increasing the power of the incident laser (Figure b) . At low optical power (0.8 mW), natural convection was dominant and thermophoresis became trivial, leading to particle accumulation around the laser spot.…”

Section: Optical Manipulation Based On Natural Convectionmentioning

confidence: 99%

Heat-Mediated Optical Manipulation

Chen

Zheng

2021

Chem. Rev.

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Progress in optical manipulation has stimulated remarkable advances in a wide range of fields, including materials science, robotics, medical engineering, and nanotechnology. This Review focuses on an emerging class of optical manipulation techniques, termed heat-mediated optical manipulation. In comparison to conventional optical tweezers that rely on a tightly focused laser beam to trap objects, heat-mediated optical manipulation techniques exploit tailorable optothermo–matter interactions and rich mass transport dynamics to enable versatile control of matter of various compositions, shapes, and sizes. In addition to conventional tweezing, more distinct manipulation modes, including optothermal pulling, nudging, rotating, swimming, oscillating, and walking, have been demonstrated to enhance the functionalities using simple and low-power optics. We start with an introduction to basic physics involved in heat-mediated optical manipulation, highlighting major working mechanisms underpinning a variety of manipulation techniques. Next, we categorize the heat-mediated optical manipulation techniques based on different working mechanisms and discuss working modes, capabilities, and applications for each technique. We conclude this Review with our outlook on current challenges and future opportunities in this rapidly evolving field of heat-mediated optical manipulation.

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Section: Optical Manipulation Based On Natural Convectionmentioning

confidence: 99%

Heat-Mediated Optical Manipulation

Chen

Zheng

2021

Chem. Rev.

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“…Many optothermal manipulation experiments rely on heat-induced flow at a temperature gradient. In recent years, there have been some methods developed to generate the temperature gradients in sample cells, which can be induced by laser heating of absorbing films [5][6][7], absorbing particles [27][28][29], or absorbing liquids [30]. Among them, a commonly used method is laser heating of absorbing films.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Transverse Trapping Forces of an Optothermal Trap Close to an Absorbing Reflective Film

et al. 2022

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The optothermal manipulation of micro-objects is significant for understanding and exploring the unknown in the microscale word, which has found many applications in colloidal science and life science. In this work, we study the transverse forces of an optothermal trap in front of a gold film, which is an absorbing reflective surface for the incident laser beam. It is demonstrated that optothermal forces can be divided into two parts: optical force of a standing-wave trap, and thermal force of a thermal trap. The optical force of the standing-wave trap can be obtained by measuring the optical trapping force close to a non-absorbing film with same reflectance. The thermal force can be obtained by subtracting the optical force of the standing-wave trap from the total trapping force of the optothermal trap close to the gold film. The results show that both optical and thermal trapping forces increase with laser power increasing. The optical trapping force is larger than the thermal trapping force, which is composed of convective drag force and thermophoretic force. Further experiment is run to study the composition of thermal force. The result shows that the convective flow is generated later than the thermophoretic flow. The results proposed here are useful for enabling users to optimize optothermal manipulation method for future applications.

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“…Graphene and its derivatives have a broad absorption band in the visible to near-infrared making them efficient thermal emitters. Microparticle aggregation and manipulation using single walled carbon nanotubes with relatively low optical intensities was demonstrated by Qian and co-workers 54 . However, there have been no reports of using 2D materials such as graphene or GO as thermal sources for large-scale optical assembly of colloidal particles.…”

Section: Introductionmentioning

confidence: 97%

Optically-assisted thermophoretic reversible assembly of colloidal particles and E. coli using graphene oxide microstructures

Joby

Das

Pinapati

et al. 2022

Sci Rep

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Optically-assisted large-scale assembly of nanoparticles have been of recent interest owing to their potential in applications to assemble and manipulate colloidal particles and biological entities. In the recent years, plasmonic heating has been the most popular mechanism to achieve temperature hotspots needed for extended assembly and aggregation. In this work, we present an alternative route to achieving strong thermal gradients that can lead to non-equilibrium transport and assembly of matter. We utilize the excellent photothermal properties of graphene oxide to form a large-scale assembly of silica beads. The formation of the assembly using this scheme is rapid and reversible. Our experiments show that it is possible to aggregate silica beads (average size 385 nm) by illuminating thin graphene oxide microplatelet by a 785 nm laser at low intensities of the order of 50–100 µW/µm2. We further extend the study to trapping and photoablation of E. coli bacteria using graphene oxide. We attribute this aggregation process to optically driven thermophoretic forces. This scheme of large-scale assembly is promising for the study of assembly of matter under non-equilibrium processes, rapid concentration tool for spectroscopic studies such as surface-enhanced Raman scattering and for biological applications.

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Microparticle manipulation using laser-induced thermophoresis and thermal convection flow

Cited by 22 publications

References 53 publications

Heat-Mediated Optical Manipulation

Heat-Mediated Optical Manipulation

Experimental Study of Transverse Trapping Forces of an Optothermal Trap Close to an Absorbing Reflective Film

Optically-assisted thermophoretic reversible assembly of colloidal particles and E. coli using graphene oxide microstructures

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