An opto-thermal approach for rotating a trapped core–shell magnetic microparticle with patchy shell

Bai, Wen Hui; Meng, Sheng; Zhou, Jinhua; Zhao, Qian; Ji, Feng; Zhong, Min

doi:10.1063/5.0092384

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…Opto-thermo-osmotic rotation techniques. Thermo-osmotic flow, generated on the surfaces of the particles 125 or substrates 75 in nonuniform temperature fields, can be utilized for the manipulation of particles resting on substrates. The flow velocity is given by 126…”

Section: Out-of-plane Rotationmentioning

confidence: 99%

“…Thermo-osmotic flow, generated on the surfaces of the particles 125 or substrates 75 in nonuniform temperature fields, can be utilized for the manipulation of particles resting on substrates. The flow velocity is given by 126 where h is the excess specific enthalpy in the boundary layer, which is positive for common solid substrates ( e.g.…”

Section: Optothermal Rotation Techniquesmentioning

confidence: 99%

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Optothermal rotation of micro-/nano-objects

et al. 2023

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Section: Out-of-plane Rotationmentioning

confidence: 99%

Section: Optothermal Rotation Techniquesmentioning

confidence: 99%

Optothermal rotation of micro-/nano-objects

et al. 2023

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An opto-thermal approach for assembling yeast cells by laser heating of a trapped light absorbing particle

Zhang

Meng

et al. 2023

Review of Scientific Instruments

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Cell assembly has important applications in biomedical research, which can be achieved with laser-heating induced thermal convective flow. In this paper, an opto-thermal approach is developed to assemble the yeast cells dispersed in solution. At first, polystyrene (PS) microbeads are used instead of cells to explore the method of microparticle assembly. The PS microbeads and light absorbing particles (APs) are dispersed in solution and form a binary mixture system. Optical tweezers are used to trap an AP at the substrate glass of the sample cell. Due to the optothermal effect, the trapped AP is heated and a thermal gradient is generated, which induces a thermal convective flow. The convective flow drives the microbeads moving toward and assembling around the trapped AP. Then, the method is used to assemble the yeast cells. The results show that the initial concentration ratio of yeast cells to APs affects the eventual assembly pattern. The binary microparticles with different initial concentration ratios assemble into aggregates with different area ratios. The experiment and simulation results show that the dominant factor in the area ratio of yeast cells in the binary aggregate is the velocity ratio of the yeast cells to the APs. Our work provides an approach to assemble the cells, which has a potential application in the analysis of microbes.

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Optical trapping of microparticles with two tilted-focused laser beams

Meng

Zhang

et al. 2023

Review of Scientific Instruments

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We present an optical method for the manipulation of microparticles using two tilted-focused beams. First, the action on the microparticles is studied with a single tilted-focused beam. The beam is used to drive the directional motion of a dielectric particle. When the optical scattering force is larger than the optical gradient force, the particle is pushed to the tilted side of the optical axis by the optical force. Second, two tilted-focused beams with the same power and complementary tilt angles are used to assemble an optical trap. The trap can be used to realize the optical trapping of the dielectric particles and opto-thermal trapping of the light absorbing particles. The trapping mechanism is the balance of the forces exerted on the particles, including the optical scattering force, optical gradient force, gravity, and thermal gradient force. The trap center is away from the focal spots, which effectively prevents the laser beam from being focused on the trapped object.

show abstract

An opto-thermal approach for rotating a trapped core–shell magnetic microparticle with patchy shell

Cited by 4 publications

References 40 publications

Optothermal rotation of micro-/nano-objects

Optothermal rotation of micro-/nano-objects

An opto-thermal approach for assembling yeast cells by laser heating of a trapped light absorbing particle

Optical trapping of microparticles with two tilted-focused laser beams

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