Foil-to-Foil System Integration Through Capillary Self-Alignment Directed by Laser Patterning

Arutinov, Gari; Mastrangeli, Massimo; Smits, Ecp Edsger; Heck, van G; Toonder, den Jmj Jaap; Dietzel, Andreas

doi:10.1109/jmems.2014.2321013

Cited by 12 publications

(44 citation statements)

References 42 publications

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“…For displacements larger than the elastic limit, we show that this behavior is distinctively characterized by the unpinning of triple contact lines. These wetting discontinuities are integral to the presented model, and supported by recent experimental evidence 24,25 . We claim for the first time that the discontinuities divide the capillary response of the meniscus into three sequential regimes and pose the physical justification of the piece-wise nature of the model.…”

Section: Introductionsupporting

confidence: 79%

“…The case of perfect pad wettability, normally assumed in elastic models, is trivially excluded in presence of edge confinement, and only possible for chemical confinement. Liquid overflow due to enhanced wettability of pads with topographical edge confinement was recently evidenced in self-alignment experiments 25 .…”

Section: A Analytical Modelmentioning

confidence: 87%

“…Chemical edge confinement was used as the bottom pad was surrounded by non-wetting areas with water contact angle θ of = 120 •23 . Edge confinement is exemplified elsewhere 25 . In spite of the optimized precoating 23 , conformal coverage of both pads by the liquid bridge is achieved along the self-alignment process only after a sequence of dynamic regimes.…”

Section: Discussionmentioning

confidence: 99%

“…In this type of models the restoring capillary forces arise exclusively from the shear deformation of liquid interfaces pinned to bounding solid surfaces. Recently however capillary self-alignment was successfully a) Corresponding author: massimo.mastrangeli@ulb.ac.be demonstrated also for centimeter-sized components 7,23 across relatively large lateral offsets 24,25 . Accounting for such evidence prompts an expansion of the reach of purely elastic models through wetting arguments.…”

Section: Introductionmentioning

confidence: 99%

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Modeling capillary forces for large displacements

Mastrangeli

Arutinov

Smits

et al. 2014

Microfluid Nanofluid

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Originally applied to the accurate, passive positioning of submillimetric devices, recent works proved capillary self-alignment as effective also for larger components and relatively large initial offsets. In this paper we describe an analytic quasi-static model of 1D capillary restoring forces that generalizes existing geometrical models and extends the validity to large displacements from equilibrium. The piece-wise nature of the model accounts for contact line unpinning singularities ensuing from large perturbations of the liquid meniscus and dewetting of the bounding surfaces. The superior accuracy of the generalized model across the extended displacement range, and particularly beyond the elastic regime as compared to purely elastic models, is supported by finite element simulations and recent experimental evidence. Limits of the model are discussed in relation to the aspect ratio of the meniscus, contact angle hysteresis, tilting and self-alignment dynamics.

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Section: Introductionsupporting

confidence: 79%

Section: A Analytical Modelmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling capillary forces for large displacements

Mastrangeli

Arutinov

Smits

et al. 2014

Microfluid Nanofluid

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“…8,9 The shape of the menisci as a function of the geometry of the bounding surfaces 21−24 as well as the ensuing capillary forces 1,24−26 and torques 1,27,28 driving capillary self-alignment have been the object of intense analytical and numerical modeling for decades. 29 Several physical and geometrical parameters have influence on the yield, throughput, and accuracy of the process, notably the geometry of the components, 18,28,30,31 the physical properties of the liquid (surface tension, 7,23 volume, 32,33 density, and viscosity 22,34−36 ), the height and curvature of the meniscus, 2,17,22 the initial offsets, 24,37 the type of meniscus confinement, 16,38−40 the wettability of the bounding surfaces, 15,41,42 and the presence of wetting defects. 3,23 A number of models and experimental investigations have been reported to describe the dynamics of capillary self-alignment.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Mode Dynamics of Capillary Self-Alignment

et al. 2014

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We present an experimental study of the complete in-plane dynamics of capillary self-alignment. The two translational (shift) and single rotational (twist) in-plane modes of square millimetric transparent dies bridged to shape-matching receptor sites through a liquid meniscus were selectively excited by preset initial offsets. The entire self-alignment dynamics was simultaneously monitored over the three in-plane degrees of freedom by high-speed optical tracking of the alignment trajectories. The dynamics of the twist mode is shown to qualitatively follow the sequence of dynamic regimes also observed for the shift modes, consisting of initial transient wetting, acceleration toward, and underdamped harmonic oscillations around the equilibrium position. Systematic analysis of alignment trajectories for individually as well as simultaneously excited modes shows that, in the absence of twist offset, the dynamics of the degenerate shift modes are mutually independent. In the presence of twist offset, the three modes conversely evidence coupled dynamics, which is attributed to a synchronization mechanism affected by the wetting of the bounding surfaces. The experimental results, justified by energetic, wetting, and dynamic arguments, provide substantial benchmarks for understanding the full dynamics of the process.

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The Fluid Joint: The Soft Spot of Micro‐ and Nanosystems

Mastrangeli

2015

Advanced Materials

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Fluid bridges are ubiquitous soft structures of finite size that conform to and link the surfaces of neighboring objects. Fluid joints, the specific type of fluid bridge with at least one extremity constrained laterally, display even more pronounced reactivity and self-restoration, which make them remarkably suited for assembly, actuation, and manipulation purposes. Their peculiar surface and bulk properties place fluid joints at the rich intersection of diverse scientific interests, and foster their widespread use throughout micro- and nanotechnology. A critical survey of the mechanics and of the manifold applications of fluid bridges and joints in micro- and nanosystems is presented here, along with current challenges and multidisciplinary perspectives.

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Foil-to-Foil System Integration Through Capillary Self-Alignment Directed by Laser Patterning

Cited by 12 publications

References 42 publications

Modeling capillary forces for large displacements

Modeling capillary forces for large displacements

In-Plane Mode Dynamics of Capillary Self-Alignment

The Fluid Joint: The Soft Spot of Micro‐ and Nanosystems

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