Drops on functional fibers: from barrels to clamshells and back

Eral, Hüseyin Burak; Ruiter, Jolet de; Ruiter, Riëlle de; Oh, Jung Min; Semprebon, Ciro; Brinkmann, Martin; Mugele, Friedrich Gunther

doi:10.1039/c0sm01403f

Cited by 96 publications

(94 citation statements)

References 28 publications

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“…For QF, it can be observed-upon closer inspection-that between the few large growing droplets, very small droplets occur and disappear within the grooves (see electronic supplementary material). The shapes of the droplets tend to attain the 'clamshell' state for both fibres, probably mainly owing to the contact angle [26]. In this state, droplets do not engulf the fibre completely, but are only attached sideways.…”

Section: Fog Chamber Experimentsmentioning

confidence: 99%

Leaf surface structures enable the endemic Namib desert grass Stipagrostis sabulicola to irrigate itself with fog water

Roth‐Nebelsick

Ebner

Miranda

et al. 2012

J. R. Soc. Interface.

177

147

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The Namib grass Stipagrostis sabulicola relies, to a large degree, upon fog for its water supply and is able to guide collected water towards the plant base. This directed irrigation of the plant base allows an efficient and rapid uptake of the fog water by the shallow roots. In this contribution, the mechanisms for this directed water flow are analysed. Stipagrostis sabulicola has a highly irregular surface. Advancing contact angle is 988 + 58 and the receding angle is 568 + 98, with a mean of both values of approximately 778. The surface is thus not hydrophobic, shows a substantial contact angle hysteresis and therefore, allows the development of pinned drops of a substantial size. The key factor for the water conduction is the presence of grooves within the leaf surface that run parallel to the long axis of the plant. These grooves provide a guided downslide of drops that have exceeded the maximum size for attachment. It also leads to a minimum of inefficient drop scattering around the plant. The combination of these surface traits together with the tall and upright stature of S. sabulicola contributes to a highly efficient natural fog-collecting system that enables this species to thrive in a hyperarid environment.

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Section: Fog Chamber Experimentsmentioning

confidence: 99%

Leaf surface structures enable the endemic Namib desert grass Stipagrostis sabulicola to irrigate itself with fog water

Roth‐Nebelsick

Ebner

Miranda

et al. 2012

J. R. Soc. Interface.

177

147

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“…1a and b) might be the roll-up process of a drop on a cylinder [31][32][33][34][35]. Depending on the contact angle and the volume, a drop will spread around a long cylinder in a shape resembling a barrel shape or alternatively roll-up into a non-axisymmetric shape resembling a clamshell.…”

Section: Introductionmentioning

confidence: 98%

“…Depending on the contact angle and the volume, a drop will spread around a long cylinder in a shape resembling a barrel shape or alternatively roll-up into a non-axisymmetric shape resembling a clamshell. The drop and cylinder geometries provide a seemingly simple system; yet, even though the morphologies have been calculated numerically [33][34][35], the precise instability criterion and non-axisymmetric topology are still uncertain [35]. A challenge is the existence of metastable states in which a drop can conform to a topology that is a local energy minimum while not necessarily being a global minimum.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric capillary bridges between contacting spheres

Farmer

Bird

2015

Journal of Colloid and Interface Science

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“…The study of static droplets on fibers has been extensively reported regarding their geometry, their wetting properties and their lifetime [1][2][3][4][5][6][7][8]. However, Gilet et al demonstrated that droplets are also able to slide along fibers owing to the competition between gravity and capillary force [9].…”

Section: Introductionmentioning

confidence: 99%

Compound droplet manipulations on fiber arrays

et al. 2015

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Recent works demonstrated that fiber arrays may constitue the basis of an open digital microfluidics. Various processes, such as droplet motion, fragmentation, trapping, release, mixing and encapsulation, may be achieved on fiber arrays. However, handling a large number of tiny droplets resulting from the mixing of several liquid components is still a challenge for developing microreactors, smart sensors or microemulsifying drugs. Here, we show that the manipulation of tiny droplets onto fiber networks allows for creating compound droplets with a high complexity level. Moreover, this cost-effective and flexible method may also be implemented with optical fibers in order to develop fluorescence-based biosensor.

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Drops on functional fibers: from barrels to clamshells and back

Cited by 96 publications

References 28 publications

Leaf surface structures enable the endemic Namib desert grass Stipagrostis sabulicola to irrigate itself with fog water

Leaf surface structures enable the endemic Namib desert grass Stipagrostis sabulicola to irrigate itself with fog water

Asymmetric capillary bridges between contacting spheres

Compound droplet manipulations on fiber arrays

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