Order-Disorder Structural Transitions in Mazes Built by Evaporating Drops

Panizza, Pascal; Algaba, H.; Postic, Marie; Raffy, Guillaume; Courbin, Laurent; Artzner, Franck

doi:10.1103/physrevlett.121.078002

Cited by 6 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…12a-c. Similar bridge configurations are observed in experiments from studies (Hamon et al 2012;Bizien et al 2014;Panizza et al 2016) as shown in Fig. 12d-f.…”

Section: Effects Of Initial Particle Concentration In Large Systemssupporting

confidence: 85%

LBM Simulation of Self-Assembly of Clogging Structures by Evaporation of Colloidal Suspension in 2D Porous Media

et al. 2018

View full text Add to dashboard Cite

Evaporation of colloidal suspension in two-dimensional (2D) porous media leads to the formation of self-assembled clogging structures (SCS). The self-assembly pattern is studied with a hybrid two-phase lattice Boltzmann method incorporating non-isothermal phase change, particle transport and deposition models. During drying, particles accumulate along the liquid-vapor interface while colloidal suspension is evaporating. Upon reaching a certain local concentration threshold, the particles deposit and form a solid structure. The patterns formed by these structures are analyzed in different 2D porous media. In small porous systems of 4 pillars, the self-assembly of C-shaped and X-shaped structures is observed, which compares well with experimental bridge configurations. SCS in porous media of three different initial particle concentrations and of three different porosities are studied in larger porous systems. Simulated self-assembled clogging configurations show good qualitative matches with experimental configuration results. Particle concentration and porosity are both seen to affect the dynamic drying processes as well as the final self-assembled clogging configuration. The liquid configuration and the clogging structure affect each other mutually during drying. With initial concentration increasing from C 0 0.00 to C 0 0.16 at a given porosity φ 0 0.68, the average evaporation rate and porosity decrease by 21.9% and 1.9%, respectively, due to blockage of pores. With increasing initial porosity from φ 0 0.53 to φ 0 0.81 at a given concentration of C 0 0.16, the average evaporation rate increases by a factor of 2.9 due to larger liquid-vapor interfacial area. Also with the given concentration of C 0 0.16, the decrease in the porosity (0.94%, 1.9% and 2.7%) is higher for higher initial porosity (φ 0 0.53, 0.68, and 0.81), since more particles (proportional to φ 0 • C 0 ) are initially present. This work opens the door for numerically assisted design of colloid-deposition-based clogging patterns.

show abstract

“…12a-c. Similar bridge configurations are observed in experiments from studies (Hamon et al 2012;Bizien et al 2014;Panizza et al 2016) as shown in Fig. 12d-f.…”

Section: Effects Of Initial Particle Concentration In Large Systemssupporting

confidence: 85%

LBM Simulation of Self-Assembly of Clogging Structures by Evaporation of Colloidal Suspension in 2D Porous Media

et al. 2018

View full text Add to dashboard Cite

show abstract

“…A step further towards more realistic biomimetic chips would also consist in replacing the PDMS by more hygrophilic materials such as hydrogels or cellulose-based porous materials. Recent studies showed for both wood (Penvern et al 2020) and cellulose-based fabrics (Ma et al 2022) that the higher water solubility of these materials leads to dynamics characterised by a most significant role played by bound water.…”

Section: Discussionmentioning

confidence: 99%

“…Once the meniscus reaches its maximal possible curvature compatible with the geometrical constraints and the contact angles of water on PDMS and glass, the situation becomes unstable, because the Laplace pressure can no longer equilibrate the elastic deformation of the channel, and the meniscus advances rapidly until the channel is fully relaxed. The onset of the jump is therefore an occurrence of a capillary threshold, as encountered in the drainage of Newtonian fluids in porous media (Wilkinson & Willemsen 1983; Lenormand & Zarcone 1985;Måløy, Feder & Jøssang 1985;Méheust et al 2002), in the flow of foams in porous media (Géraud et al 2016), or in the pervaporation dynamics in an array of micropillars (Panizza et al 2018). Hence the maximal deformation of the channel is correlated, through Laplace pressure, to the maximal curvature of the meniscus.…”

Section: Confocal Imaging Of the Deformation Of The Channel During Th...mentioning

confidence: 99%

See 1 more Smart Citation

Intermittent air invasion in pervaporating compliant microchannels

Keiser

Marmottant²,

Dollet³

2022

J. Fluid Mech.

View full text Add to dashboard Cite

We explore air invasion in a dead-end compliant water-filled microchannel containing a constriction. The phenomenon is driven by the pervaporation of the liquid present in the channel through the surrounding medium. The penetration is intermittent, jerky and characterised by a stop-and-go dynamics as the bubble escapes the constriction. We demonstrate that this sequence of arrest and jump of the bubble is due to an elasto-capillary coupling between the air–liquid interface and the elastic medium. When the interface enters the constriction, its curvature increases strongly, leading to a depressurisation within the liquid-filled channel that drives a compression of the channel. As the interface is forced to leave the constriction at a given threshold pressure, due to the ongoing loss of liquid content by pervaporation, the pressure is suddenly released, which gives rise to a rapid propagation of the air bubble away from the constriction, and a restoration of the rest shape of the channel. Combining macroscopic observations and confocal imaging, we present a comprehensive experimental study of this phenomenon. In particular, the effect of the channel geometry on the time of arrest in the constriction and the jump length is investigated. Our novel microfluidic design succeeds in mimicking the role of inter-vessel pits in plants, which transiently stop the propagation of air embolisms during long and severe droughts. It is expected to serve as a building block for further biomimetic studies in more complex leaf-like architectures, in order to recover this universal phenomenon of intermittent propagation reported in real leaves.

show abstract

“…To do so, we used a previously developed approach in which we let dry an aqueous suspension of QRs in between a flat substrate, either a silicon wafer or a glass coverslip, and a PDMS stamp on which round pillars, 35 μm high and 100 μm in radius, are regularly spaced by 75 μm on a square lattice (Figure 2(a)) [36,43]. More precisely, sample QR Pattern S2A).…”

Section: Qr Supracrystals Synthesis and Morphological Characterizationmentioning

confidence: 99%

Controlling the Emission Properties of Quantum Rods via Multiscale 3D Ordered Organization

Bizien

Postic

Even-Hernandez

et al. 2021

Journal of Nanomaterials

View full text Add to dashboard Cite

A specific organization of optically active nanoscale objects can greatly affect the optical response of a system. Here, we report the controlled modification of the fluorescent emission by the assembly of water-soluble quantum rods (QRs). Our study combines optical, electron microcopy, and X-ray scattering characterizations to reveal a correlation between the self-assembly behavior of QRs into ordered 3D-arrays and the optical properties (luminescence) of formed assemblies, where the observed optical response is highly dependent on the QR aspect ratio. Specifically, shorter, 18 nm long QRs (QR18), exhibiting a well-defined smectic packing, demonstrate an enhancement of the emission intensity accompanied by a red shift and a lifetime reduction. In contrast, 40 nm long QRs (QR40), forming a columnar phase, does not show these optical properties.

show abstract

Order-Disorder Structural Transitions in Mazes Built by Evaporating Drops

Cited by 6 publications

References 21 publications

LBM Simulation of Self-Assembly of Clogging Structures by Evaporation of Colloidal Suspension in 2D Porous Media

LBM Simulation of Self-Assembly of Clogging Structures by Evaporation of Colloidal Suspension in 2D Porous Media

Intermittent air invasion in pervaporating compliant microchannels

Controlling the Emission Properties of Quantum Rods via Multiscale 3D Ordered Organization

Contact Info

Product

Resources

About