Liquid Morphologies on Structured Surfaces: From Microchannels to Microchips

Gau, Hartmut; Herminghaus, Stephan; Lenz, Peter; Lipowsky, Reinhard

doi:10.1126/science.283.5398.46

Cited by 998 publications

(870 citation statements)

References 12 publications

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“…2(b). Such bulges have been reported before in the case of wetting of planar patterned surfaces by liquid stripes [43][44][45] and for the melting behavior of terraces with straight edges 20 . There are temperature ranges, where rouloids or bulged morphologies are possible and there are ranges (below T m ), where only rouloids are possible.…”

Section: A General Theoretical Approachmentioning

confidence: 80%

Morphological Transitions during Melting of Small Cylindrical Aggregates

Jin

Riegler

2016

J. Phys. Chem. C

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Most studies on melting under confinement focus only on the solid and liquid melt phases. Despite of its ubiquity, contributions from the capillary interface (liquid / vapor interface) are often neglected. In this study the melting behavior of small cylindrical aggregates in vapor attached to planar surfaces is analyzed. For the assumed boundary conditions (cylindrical solid with a non wetting top plane and a wettable side wall) solid and the liquid phases can coexist within a certain temperature range. Due to capillary instability, the liquid phase can form either an axisymmetric rouloid morphology or, above a certain threshold liquid volume fraction, a bulge coexisting with a rouloid-like section. The corresponding melting points are different. The analysis explicitly describes the behavior of a real system of small aggregates of long chain alkanes on planar substrates. It also gives qualitative insights into the melting behavior of small aggregates with anisotropic wetting behaviors in general. It reveals in particular how melting points and melting pathways depend on the energetic respectively morphological pathways leading to complete melting.

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Section: A General Theoretical Approachmentioning

confidence: 80%

Morphological Transitions during Melting of Small Cylindrical Aggregates

Jin

Riegler

2016

J. Phys. Chem. C

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“…The behaviour of fluids spreading and moving across such surfaces is extremely rich, and is only just beginning to be explored [1,2,3,4,5,6,7,8,9,10,11]. Biosystems have evolved to use hydrophobic and hydrophilic patches to direct the motion of fluids at surfaces [12,13].…”

Section: Introductionmentioning

confidence: 99%

Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Kusumaatmaja

Yeomans

2006

Langmuir

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We explore numerically the feasibility of using chemical patterning to control the size and polydispersity of micron-scale drops. The simulations suggest that it is possible to sort drops by size or wetting properties by using an array of hydrophilic stripes of different widths. We also demonstrate that monodisperse drops can be generated by exploiting the pinning of a drop on a hydrophilic stripe. Our results follow from using a lattice Boltzmann algorithm to solve the hydrodynamic equations of motion of the drops and demonstrate the applicability of this approach as a design tool for micofluidic devices with chemically patterned surfaces.

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“…Several techniques to realize such a modulation of the wetting properties have been reported, so far. These include microcontact printing (3), vapor deposition, and photolithography (4,5). Fluidic motion or guided flow on the substrate can be observed (6) by changing the wetting properties with time.…”

mentioning

confidence: 99%

Pressure-driven flow in open fluidic channels

Davey¹,

Neild²

2011

Journal of Colloid and Interface Science

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The miniaturization and integration of electronic circuitry has not only made the enormous increase in performance of semiconductor devices possible but also spawned a myriad of new products and applications ranging from a cellular phone to a personal computer. Similarly, the miniaturization and integration of chemical and biological processes will revolutionize life sciences. Drug design and diagnostics in the genomic era require reliable and cost effective high throughput technologies which can be integrated and allow for a massive parallelization.Microfluidics is the core technology to realize such miniaturized laboratories with feature sizes on a submillimeter scale. Here, we report on a novel microfluidic technology meeting the basic requirements for a microfluidic processor analogous to those of its electronic counterpart: Cost effective production, modular design, high speed, scalability and programmability.Microfluidic systems miniaturize chemical and biological processes on a submillimeter scale. Reducing the dimensions of macroscopic biological or chemical laboratories is advantageousfor the following reasons: The small scale allows for the integration of various processes on one chip analogous to integrated microelectronic circuitry. Thus manual handling, e.g. when transferring reagents from one process step to the next, can be reduced. Such an integration is the prerequisite for a fully automated data management system covering all steps of a given chemical or biological process. Furthermore, the required reagent volumes are reduced thus saving both material costs and process time as many of the time consuming amplification steps for biological substances can be omitted. Finally, the miniaturization results in enhanced precision by providing more homogenous reaction conditions and in shorter times for diffusion driven reactions.

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Liquid Morphologies on Structured Surfaces: From Microchannels to Microchips

Cited by 998 publications

References 12 publications

Morphological Transitions during Melting of Small Cylindrical Aggregates

Morphological Transitions during Melting of Small Cylindrical Aggregates

Controlling Drop Size and Polydispersity Using Chemically Patterned Surfaces

Pressure-driven flow in open fluidic channels

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