Optofluidic transport and manipulation of plasmonic nanoparticles by thermocapillary convection

Winterer, Felix; Maier, Christoph M.; Pernpeintner, Carla; Lohmüller, Theobald

doi:10.1039/c7sm01863k

Cited by 41 publications

(49 citation statements)

References 43 publications

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“…Compared with the natural convection described above, Maran goni convection is a much stronger convective flow, [18] which commonly occurs at liquid-gas interfaces under comparable thermal energy inputs. While natural convection originates from fluidic gravity induced by the temperaturedependent density of the fluid, Marangoni convection is caused by the temperaturedependent surface tension at the liquid-air inter face, where the fluid molecules are dragged toward regions with higher surface tension, [82] so it is also call thermocapillary effect.…”

Section: Marangoni Convectionmentioning

confidence: 99%

“…This effect operates near the interface of different phases and drives the particles along a temperature gradient from the cold to the hot region. The manipulation of colloidal particles based on interfacial Marangoni convection has been reported . As Figure shows, a 55 wt% solution of polyethyleneglycol (PEG) with high viscosity compared with water is used to suppress the particles' Brownian motion in the experiments.…”

Section: Thermal Optofluidic Applicationsmentioning

confidence: 99%

“…[20,[55][56][57] Microbubbles have found a range of applica tions in microfluidic systems, including the prominent ability to induce strong Marangoni convection by creating an uneven thermal distribution at the liquid-air interface to support long range actuation and particle transportation. [18,56,58] Because it can be used to manipulate microfluids in a noncontact manner, optofluidic actuation has a unique ability to enhance the sensing performance of microfluidic systems and simplify their design. He is also an advisor in startup companies, consulting on the solution for biomedical applications in different fields.…”

Section: Optofluidic Actuationmentioning

confidence: 99%

“…In addition, the powerful hydrodynamic phenomenon of microbubbles can be produced to enhance optofluidic systems due to their high optothermal conversion efficiency . Microbubbles have found a range of applications in microfluidic systems, including the prominent ability to induce strong Marangoni convection by creating an uneven thermal distribution at the liquid–air interface to support long‐range actuation and particle transportation . Because it can be used to manipulate microfluids in a noncontact manner, optofluidic actuation has a unique ability to enhance the sensing performance of microfluidic systems and simplify their design.…”

Section: Introductionmentioning

confidence: 99%

“…[14] A quanti tative study by Chen et al showed that nanostructures excited by a critical light pulse can be heated from room temperature to 795 K in 4 ns. [16] Therefore, the unique temporal and spa tial property of plasmonic temperature gradient can lead to various intriguing micro and nanoscale optothermal-hydrody namic phenomena, such as Rayleigh-Benardlike fluid convec tion, [17] Marangoni convection, [18][19][20] thermophoresis, [21][22][23] the Seebeck effect, [24] depletion forces, [25,26] interfacial effects in colloidal particles, [27][28][29] and other interactions. To comprehen sively understand optothermal effects, researchers have focused on the origins of heat and thermodynamic motion on the Thermal optofluidics is an emerging field that promises to create numerous research and application opportunities in biophysics, biochemistry, and clinical biology.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Thermal Optofluidics: Principles and Applications

Chen

Loo

Wang

et al. 2019

Advanced Optical Materials

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Thermal optofluidics is an emerging field that promises to create numerous research and application opportunities in biophysics, biochemistry, and clinical biology. Innovation in plasmonic optics has led to the development of various invaluable tools in the fields of biosensing and microfluidic manipulation. The optothermal effect originates from light–matter interactions during photon–phonon conversion, which can lead to micro‐ or nanoscale inhomogeneities in the thermal distribution. This further induces a series of hydrodynamic phenomena such as natural convection, Marangoni convection, thermophoresis, the electrolyte Seebeck effect, depletion forces, and interfacial effects in colloidal particles. Light–matter interactions are particularly important for three aspects of microfluidics, namely the motion of colloidal particles, fluidic actuation, and biochemical reactions. This review first systematically elucidates the role of both nanoscale plasmonic thermal generation and heat‐induced fluidic motion in optofluidic microsystems. Then, recent state‐of‐the‐art thermal optofluidic applications of the above‐listed three aspects are presented. The paper aims to provide an insightful reference for future research in optofluidic biochemical systems.

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Section: Marangoni Convectionmentioning

confidence: 99%

Section: Thermal Optofluidic Applicationsmentioning

confidence: 99%

Section: Optofluidic Actuationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Optofluidics: Principles and Applications

Chen

Loo

Wang

et al. 2019

Advanced Optical Materials

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Magnetically Enhanced Marangoni Convection for Efficient Mass and Heat Transfer like a Self‐Driving Liquid Conveyor Belt

Zhang

Lin

Liu

et al. 2022

Adv Funct Materials

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Temperature gradient-induced Marangoni convection has attracted much attention for basic research and applications since it provides an effective means for mass and heat transfer through a liquid surface flow. Here the authors first propose a general principle to enhance such surface flow by hindering its transition to recirculation flow using an external field. They subsequently identify ferrofluid and use it validate the principle since its reduced magnetic susceptibility at higher temperatures will make the heated surface liquid stay on the surface by a thermomagnetic body force. Using a laser beam to create a heated local surface and a magnet beneath the ferrofluid to provide a vertical field, a high speed and long-range Marangoni flow is confirmed experimentally and further supported by computational fluid dynamics simulations. To demonstrate possible applications, the authors show a self-driving pipeless liquid conveyor belt that can efficiently transfer heat from a source to sink without external power. The demonstration of enhanced Marangoni convection opens new avenue to explore interfacial fluid dynamics and its wide applications.

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High‐Rate Printing of Micro/Nanoscale Patterns Using Interfacial Convective Assembly

et al. 2020

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Electric-field-directed assembly [31,32] uses electrophoretic and dielectrophoretic forces to direct nanoelements. Although electric-field-directed assembly demonstrates high throughput, high scalability, and high resolution in assembling various nanomaterials, conductive substrates are required to generate electric field, which limits potential applications of printed structures in electronic devices. Fluidicflow-directed assembly such as convective [33][34][35] and capillary [36][37][38] assembly utilizes solvent evaporation-induced convective flow to guide and position nanoelements. Unlike electric-field-directed assembly, fluidic-flow-directed assembly is applicable to all kinds of substrates (both insulating and conductive). However, it takes hours to assemble over centimetersized substrates. Therefore, the scalability and throughput of this assembly process is a major challenge. Photothermally directed assembly uses photothermaleffect-induced Rayleigh-Benard [39] and/or Marangoni [40][41][42] convective flow to direct assembly. Similar to fluidic-flow-directed assembly, photothermally directed assembly suffers from scalability and throughput issues due to its serial processing nature. In addition, photothermally directed assembly has a limited resolution of micro or sub-micro scale. [43,44] Therefore, the development of a broadly applicable, highly scalable, high throughput, and high resolution printing technique is highly desirable.Here, we report a novel fluidic-flow-directed assembly technique, interfacial convective assembly, to rapidly assemble particles in pattern areas on any substrates. In the interfacial convective assembly, a patterned substrate is initially sonicated in isopropyl alcohol (IPA) using a bath type sonicator for a few seconds. With a low surface tension, IPA helps wet as well as remove trapped air in the patterned structures. After sonication, the substrate is removed from the IPA bath, leaving a thin IPA film on the substrate. Afterward, 50 µL aqueous particle suspension is drop casted on the IPA film. The particle suspension immediately mixes with the IPA film, resulting a suspension with ≈20 wt% IPA. Then, a glass slide is covered on the suspension, creating a confined environment with the substrate via a 300 µm thick spacer (Figure 1a). Finally, the setup is placed onto a hot plate with preheated temperatures between 40 and 75 °C. The substrate is heated up, inducing a convective flow. Due to the convective flow, particles are carried toward Printing of electronics has been receiving increasing attention from academia and industry over the recent years. However, commonly used printing techniques have limited resolution of micro-or sub-microscale. Here, a directed-assembly-based printing technique, interfacial convective assembly, is reported, which utilizes a substrate-heating-induced solutal Marangoni convective flow to drive particles toward patterned substrates and then uses van der Waals interactions as well as geometrical confinement to trap the particles in the pattern area...

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Optofluidic transport and manipulation of plasmonic nanoparticles by thermocapillary convection

Cited by 41 publications

References 43 publications

Thermal Optofluidics: Principles and Applications

Thermal Optofluidics: Principles and Applications

Magnetically Enhanced Marangoni Convection for Efficient Mass and Heat Transfer like a Self‐Driving Liquid Conveyor Belt

High‐Rate Printing of Micro/Nanoscale Patterns Using Interfacial Convective Assembly

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