Theoretical Analysis of Metallic-Nanodimer Thermoplasmonics for Phototactic Nanoswimmers

Bertoni, Andrés I.; Passarelli, Nicolás; Bustos-Marún, Raúl A.

doi:10.1021/acsanm.9b02505

Cited by 3 publications

(3 citation statements)

References 54 publications

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“…Their velocity can reach 8.9 µm s −1 (Figure 8C). Furthermore, Bertoni et al [60] suggested that simple symmetric structures of metal nanodimers (Au, Ag, and Cu) have strong phototropism by theoretical calculations. Among them, symmetric Ag homodimers with radii between 20-40 nm were the best candidates.…”

Section: Design Of Mnms With Phototaxismentioning

confidence: 99%

Micro‐Nano Motors with Taxis Behavior: Principles, Designs, and Biomedical Applications

Gao

Feng

Wilson

et al. 2022

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As a novel mobile nanodevice, micro‐nano motors (MNMs) can convert the energy of the surrounding environment into mechanical motion. With this unique ability, they promise revolutionary potential in bio‐applications including precise drug delivery, bio‐sensing, and noninvasive surgery. Yet for practically reaching the target and fulfilling these tasks in dynamically changing bio‐environment, environment adaptivity beyond propulsion is important yet challenging. MNMs with taxis behavior/autonomous target‐seeking ability offer a desirable solution. These motors can adaptively move to the target location and complete the task. Thanks to the persistent efforts of researchers, tactic MNMs have shown automatic navigation to target under various energy fields, not only in static environments, but also in shear rheological conditions that simulate blood flow. Therefore, tactic motors with self‐targeting capability lay a concrete foundation for targeted drug delivery, cell transplantation, and thrombus ablation. This review systematically presents the moving principle, design, and biological applications of tactic MNMs under different energy fields. Through in‐depth analysis of state‐of‐art progress, the obstacles of the field and possible solutions are discussed. With the continuous innovation and breakthroughs of multi‐disciplinary researchers, MNMs with taxis behavior are expected to provide a revolutionary solution for cancer and other major diseases in the biomedical field.

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Section: Design Of Mnms With Phototaxismentioning

confidence: 99%

Micro‐Nano Motors with Taxis Behavior: Principles, Designs, and Biomedical Applications

Gao

Feng

Wilson

et al. 2022

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“…Trajectory loops were created using a diverging laser beam. An interesting Janus-like configuration was also proposed [ 33 ], having pairs of spherical particles, where each pair consisted of two particles of different materials and providing estimates for the thermophoretic forces and velocities. This brings us to the idea of designing special micro-motors based on the JP concept (e.g.…”

Section: Introductionmentioning

confidence: 99%

Self-thermophoresis of laser-heated spherical Janus particles

Avital

Miloh

2021

Eur. Phys. J. E

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An analytic framework is presented for calculating the self-induced thermophoretic velocity of a laser-heated Janus metamaterial micro-particle, consisting of two conducting hemispheres of different thermal and electric conductivities. The spherical Janus is embedded in a quiescent fluid of infinite expanse and is exposed to a continuous light irradiation by a defocused laser beam. The analysis is carried under the electrostatic (Rayleigh) approximation (radius small compared to wavelength). The linear scheme for evaluating the temperature field in the three phases is based on employing a Fourier–Legendre approach, which renders rather simple semi-analytic expressions in terms of the relevant physical parameters of the titled symmetry-breaking problem. In addition to an explicit solution for the self-thermophoretic mobility of the heated Janus, we also provide analytic expressions for the slip-induced Joule heating streamlines and vorticity field in the surrounding fluid, for a non-uniform (surface dependent) Soret coefficient. For a ‘symmetric’ (homogeneous) spherical particle, the surface temperature gradient vanishes and thus there is no self-induced thermophoretic velocity field. The ‘inner’ temperature field in this case reduces to the well-known solution for a laser-heated spherical conducting colloid. In the case of a constant Soret phoretic mobility, the analysis is compared against numerical simulations, based on a tailored collocation method for some selected values of the physical parameters. Also presented are some typical temperature field contours and heat flux vectors prevailing in the two-phase Janus as well as light-induced velocity and vorticity fields in the ambient solute and a new practical estimate for the self-propelling velocity. Graphic abstract

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“…This persistence length increases the diffusion constant of the Brownian particle. The aforementioned property has been verified experimentally, , and various propulsion mechanisms to induce a net nonreciprocal force have been proposed, such as chemical reactions, − external illumination, − ultrasound, and magnetic − and electric fields. , Speckle patterns have been used to promote out of equilibrium dynamics, , and the use of optical forces, applied currently to promote binding, , have been proposed in the literature to induce active motion . However, an analysis of an active propulsion driven by nonreciprocal optical forces in a isotropic radiation environment is still lacking.…”

mentioning

confidence: 98%

Active Motion Induced by Random Electromagnetic Fields

2022

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Active particles are capable of extracting energy from their environment and converting it into direct motion. This direct motion is usually attained by asymmetries, which induce a net force in the particle. In this article we show how a dimer made up of two nanoparticles can obtain this energy supply from the nonreciprocal force induced by an homogeneous and isotropic random electromagnetic field. We explicitly obtain the value of the force and find it to be different from zero only for sets of different particles in which at least one of them is absorbent. In addition, we prove that the nonreciprocity of the force is the condition for the interaction dynamics to be nonconservative. We further show how this mechanism can be used to induce active Brownian motion with persistent random walks, effective diffusion coefficients, and noticeable Péclet numbers.

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Theoretical Analysis of Metallic-Nanodimer Thermoplasmonics for Phototactic Nanoswimmers

Cited by 3 publications

References 54 publications

Micro‐Nano Motors with Taxis Behavior: Principles, Designs, and Biomedical Applications

Micro‐Nano Motors with Taxis Behavior: Principles, Designs, and Biomedical Applications

Self-thermophoresis of laser-heated spherical Janus particles

Active Motion Induced by Random Electromagnetic Fields

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