Dip- and die-coating of hydrophilic squares on flat, hydrophobic substrates

Brasjen, BJ Berend; Wedershoven, Hmjm Ber; Cuijk, van Aw Nick; Darhuber, Anton A.

doi:10.1016/j.ces.2016.10.026

Cited by 13 publications

(12 citation statements)

References 75 publications

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“…At slightly higher withdrawal speeds the average droplet volume increases (see Fig. 3 and Figure S2 ) which is consistent with previous observations 20 , 22 , 23 , 34 . However, due to the very complicated 3-dimensional geometry of the flow limiting region, analytical estimates of the effects of flow speed are very difficult to make.…”

Section: Resultssupporting

confidence: 92%

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Generation of micro-droplet arrays by dip-coating of biphilic surfaces; the dependence of entrained droplet volume on withdrawal velocity

Mandsberg

Hansen

Taboryski

2017

Sci Rep

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Droplet array chips were realized using an alignment-free fabrication process in silicon. The chips were textured with a homogeneous nano-scale surface roughness but were partially covered with a self-assembled monolayer of perfluorodecyltrichlorosilane (FDTS), resulting in a super-biphilic surface. When submerged in water and withdrawn again, microliter sized droplets are formed due to pinning of water on the hydrophilic spots. The entrained droplet volumes were investigated under variation of spot size and withdrawal velocity. Two regimes of droplet formation were revealed: at low speeds, the droplet volume achieved finite values even for vanishing speeds, while at higher speeds the volume was governed by fluid inertia. A simple 2D boundary layer model describes the behavior at high speeds well. Entrained droplet volume could be altered, post-fabrication, by more than a factor of 15, which opens up for more applications of the dip-coating technique due to the significant increase in versatility of the micro-droplet array platform.

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Section: Resultssupporting

confidence: 92%

“…For chemically patterned surfaces (long, narrow hydrophilic lines) Darhuber et al . and Davis found a different power law scaling, 20 – 23 . In this study, we find a clear deviation from the classical power law theories, since we observe a finite droplet volume in the zero-speed limit.…”

Section: Introductionmentioning

confidence: 99%

Generation of micro-droplet arrays by dip-coating of biphilic surfaces; the dependence of entrained droplet volume on withdrawal velocity

Mandsberg

Hansen

Taboryski

2017

Sci Rep

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“…I showed that combined topographical and chemical patterning enables selective and fully conformal liquid coating of receptors with arbitrary shape [27,28]. Reproducibility of deposited liquid volumes depends on the dynamics of the coating process [26]. Edge confinement of liquids in air, over e.g.…”

Section: Self-assembly Across Scales Millimeter Scale: Capillary Selfmentioning

confidence: 99%

“…My research has addressed several aspects of capillary SA and self-alignment, eminently liquid deposition, quasi-statics and dynamics of confined liquid bridges, and electronic systems integration. Dip coating [26] is a conveniently simple technique for coating in parallel large, planar arrays of receptors with liquid droplets [12]. I showed that combined topographical and chemical patterning enables selective and fully conformal liquid coating of receptors with arbitrary shape [27,28].…”

Section: Self-assembly Across Scales Millimeter Scale: Capillary Selfmentioning

confidence: 99%

Self-assembly of micro/nanosystems across scales and interfaces

Mastrangeli

2017

2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)

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Steady progress in understanding and implementation are establishing self-assembly as a versatile, parallel and scalable approach to the fabrication of transducers. In this contribution, I illustrate the principles and reach of self-assembly with three applications at different scales -namely, the capillary self-alignment of millimetric components, the sealing of liquid-filled polymeric microcapsules, and the accurate capillary assembly of single nanoparticles -and propose foreseeable directions for further developments.

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“…Note that the thickness scaling factor k is independent of the width ( W ) of the micropatterned wettable domains. Its value is related to the transverse curvature of the liquid droplet deposited within the patterned domain and is expected to remain constant for length scales used in this work. − Using an asymptotic matching technique, Davis et al computed the numerical value of the proportionality constant k = 0.356. The k value for our data ( k ∼ 0.33) closely matches this theoretical value.…”

mentioning

confidence: 99%

Wettability Engendered Templated Self-Assembly (WETS) for the Fabrication of Biocompatible, Polymer–Polyelectrolyte Janus Particles

et al. 2019

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Fabrication of charged, multiphasic, polymeric microand nanoparticles with precise control over their composition, size, and shape is critical for developing the next generation of drug carriers for combinatorial therapies and theranostics. The addition of charged polyelectrolyte multilayers on the surface of polymeric particles can significantly improve their stability, targeting efficacy, drug-release kinetics, and their ability to encapsulate different drugs within a single particle. Many of the traditional methods for multilayer functionalization of multiphasic polymeric particles are time and energy intensive which significantly limits their scalability, and therefore therapeutic potential. In this work, we combine the bulk layer-by-layer polyelectrolyte application methodology with our previously developed technique of fabricating multiphasic polymeric particles on substrates with patterned wettability to synthesize biocompatible, monodisperse, Janus polymer−polyelectrolyte particles.

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Dip- and die-coating of hydrophilic squares on flat, hydrophobic substrates

Cited by 13 publications

References 75 publications

Generation of micro-droplet arrays by dip-coating of biphilic surfaces; the dependence of entrained droplet volume on withdrawal velocity

Generation of micro-droplet arrays by dip-coating of biphilic surfaces; the dependence of entrained droplet volume on withdrawal velocity

Self-assembly of micro/nanosystems across scales and interfaces

Wettability Engendered Templated Self-Assembly (WETS) for the Fabrication of Biocompatible, Polymer–Polyelectrolyte Janus Particles

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