Hydrodynamic manipulation of nano-objects by optically induced thermo-osmotic flows

Fränzl, Martin; Cichos, Frank

doi:10.1038/s41467-022-28212-z

Cited by 65 publications

(73 citation statements)

References 50 publications

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“…Over recent decades, optothermal manipulation techniques [1][2][3][4] have become useful tools for manipulating micro-objects such as microparticles [5][6][7][8][9][10][11][12], or microbubbles [13][14][15][16][17], etc. The optothermal methods manipulate the micro-objects by exerting the optothermal forces, which are based on various light-induced thermal processes [1] such as Marangoni convection [18], thermophoresis [19], thermophoretic depletion [20], thermoelectricity [21][22][23], and photophoresis [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

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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“…Moreover, when a substrate is heated, the thermo-osmotic flow in the vicinity of the substrate can also be used to direct and rotate neighboring micro/nanoparticles. 36,75,76…”

Section: Fundamental Mechanismsmentioning

confidence: 99%

Optothermal rotation of micro-/nano-objects

et al. 2023

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“…However, they are usually limited by specific substrates, complex setups, or confined working ranges. Recently, optothermal tweezers have been developed to achieve versatile manipulation of colloidal particles under a light-controlled temperature gradient [14][15][16][17][18] . While optothermal tweezers enable enhanced trapping capability with a laser power that is 2-3 orders of magnitude lower than optical tweezers, 19 optical heating can cause thermal stress and degradation to the particles and biological cells.…”

Section: Introductionmentioning

confidence: 99%

Hypothermal opto-thermophoretic tweezers

Kollipara

et al. 2023

Preprint

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Optical tweezers have profound importance across fields ranging from manufacturing to biotechnology. However, the requirement of refractive index contrast and high laser power results in potential photon and thermal damage to the trapped objects, such as nanoparticles and biological cells. Optothermal tweezers have been developed to trap particles and biological cells via opto-thermophoresis with much lower laser powers. However, the intense laser heating and stringent requirement of the solution environment prevent their use for general biological applications. Here, we propose hypothermal opto-thermophoretic tweezers (HOTTs) to achieve low-power trapping of diverse colloids and biological cells in their native fluids. HOTTs exploit an environmental cooling strategy to simultaneously enhance the thermophoretic trapping force at sub-ambient temperatures and suppress the thermal damage to target objects. We further apply HOTTs to demonstrate the three-dimensional manipulation of functional plasmonic vesicles for controlled cargo delivery. With their noninvasiveness and versatile capabilities, HOTTs present a promising tool for fundamental studies and practical applications in materials science and biotechnology.

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Hydrodynamic manipulation of nano-objects by optically induced thermo-osmotic flows

Cited by 65 publications

References 50 publications

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

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

Optothermal rotation of micro-/nano-objects

Hypothermal opto-thermophoretic tweezers

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