Thermocapillary Migration of Liquid Droplets Induced by a Unidirectional Thermal Gradient

Dai, Qingwen; Khonsari, M. M.; Shen, Cong; Huang, Wei

doi:10.1021/acs.langmuir.6b01614

Cited by 61 publications

(51 citation statements)

References 41 publications

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“…In these latter cases, treating the viscosity as uniform is acceptable as most of the material migration necessarily occurs in the hottest regions, thus mirroring the results on LSA of liquids. [121][122][123][124][125] In FLaSk of polymers, however, some consideration needs to be taken of the viscosity/ mobility of the polymeric melts. Finally, in contrast to ablation or photolithography, where overlap effects are directly additive, in dewetting material is moved rather than removed, and thusly, the temporal sequence of overlapped patterning is critical.…”

Section: Reviewmentioning

confidence: 99%

“…Further, in glassy polymers, because there is a glass transition as opposed to complete melting, the viscosity is more varied than the metallic case considered by Grigopolous or even the molecular resist considered by Rogers. In these latter cases, treating the viscosity as uniform is acceptable as most of the material migration necessarily occurs in the hottest regions, thus mirroring the results on LSA of liquids . In FLaSk of polymers, however, some consideration needs to be taken of the viscosity/mobility of the polymeric melts.…”

Section: Introductionmentioning

confidence: 95%

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Thermocapillary approaches to the deliberate patterning of polymers

Singer

2017

J Polym Sci B Polym Phys

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The phenomenon of thermocapillarity, the response of fluids to thermal gradients due to thermal alteration of their surface tension, was first reported over a century ago. Since then, research has focused generally on either the fundamentals or mitigation of this effect during the processing of materials. Only in the past two decades has the deliberate use of thermocapillary forces for the patterning of polymers been actively pursued, either for the ordering of internal structure or the introduction of topographic features. This review seeks to highlight this work and to identify directions for further investigation. In particular, while thermocapillary forces are often inextricably bound to other mechanisms, there are emerging directions in the deliberate coupling of forces to improve the capabilities of each mechanism. Further, the applications of thermocapillary patterning to polymer-nanoparticle composites has recently provided another promising route to active architectures.

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Section: Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Thermocapillary approaches to the deliberate patterning of polymers

Singer

2017

J Polym Sci B Polym Phys

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“…Theoretically, the physical model of migration can be established based on the derivation of 2 main forces: the driving force due to the unbalanced interfacial tensions in the vicinity of the 3 phase contact line and the viscous resistance force. By solving the balance of these 2 forces, a theoretical expression for the migration velocity can be achieved . In practice, utilisation of specialty lubricants or lubricant additives provides an effective way to either mitigate or impede the thermocapillary migration.…”

Section: Introductionmentioning

confidence: 99%

The thermocapillary migration on rough surfaces

Dai

Khonsari

et al. 2018

Lubrication Science

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In tribo‐system, thermal gradients will drive the liquid lubricant to migrate from warm to cold regions, resulting in starved lubrication. This study reports an experimental investigation on the influence of surface topography on the migration behavior of paraffin oil lubricants. Experimental results are provided for specimens treated by polishing, shot‐blasting, and sandpaper grinding techniques. 3D surface parameters of average surface roughness Sa and developed interfacial area ratio Sdr are measured via a 3D optical microscope, and the influences on migration behavior are discussed. Experimental results demonstrate that shot‐blasting process is an effective approach to impede the thermocapillary migration, and that decreasing surface roughness will contribute to the obstruction effect. A particular attention is paid to the inherent correlation of the migration capacity with the contact angle and surface free energy.

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“…Note that the viscosity temperature dependence has a limited effect on the migration of the liquid bridge, which seems to be different from the migration on the free solid surface. 51 Liquid droplets would integrally migrate to the cold side on free solid surfaces, resulting in a rapid variation in viscosity, while for liquid bridges, the major part of liquids remains at the interface of spheres and plates.…”

Section: ■ Resultsmentioning

confidence: 99%

Migration of Liquid Bridges at the Interface of Spheres and Plates with an Imposed Thermal Gradient

Dai

Chong

2020

Langmuir

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In this paper, we experimentally investigate the migration of liquid bridges at the interface of spheres and plates with an imposed thermal gradient. The key influencing factors of interface gap, sphere material and diameter, liquid viscosity, and thermal gradient on the migration behaviors are highlighted. Furthermore, the physical mechanism of this intriguing interfacial phenomenon is numerically unraveled. The originality of this work lies in the fact that when thermal gradients were encountered, liquid bridges could migrate at the interface of spheres and plates, and a general design philosophy of related parameters for enhancing or weakening this thermal flow is proposed.

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Thermocapillary Migration of Liquid Droplets Induced by a Unidirectional Thermal Gradient

Cited by 61 publications

References 41 publications

Thermocapillary approaches to the deliberate patterning of polymers

Thermocapillary approaches to the deliberate patterning of polymers

The thermocapillary migration on rough surfaces

Migration of Liquid Bridges at the Interface of Spheres and Plates with an Imposed Thermal Gradient

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