Microplasma writing for surface-directed millifluidics

West, Jonathan; Michels, A.; Kittel, Silke; Jacob, Peter; Franzke, Joachim

doi:10.1039/b706788g

Cited by 47 publications

(35 citation statements)

References 15 publications

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“…Similar to surface-directed channels reported by other groups [6][7][8][9][10][11][12][13], the channels used in this study did not have sidewalls. Such channels are likely to flood if one uses a pressure pump to make the water flow.…”

Section: Mechanism To Cause Water To Flow Through a Channel Without Ssupporting

confidence: 73%

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Microchannels Constructed on Rough Hydrophobic Surfaces

Watanabe

2008

Chem Eng & Technol

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A microchannel was constructed between two glass slides, taking advantage of their surface properties. The channel geometry was defined by a line that was previously printed on the slide surface using a highly water-soluble liquid [2-(2-ethoxyethoxy)ethanol] as the ink. Water, which acted as the working fluid flowed along this line. Although the channel did not have any sidewalls, the water was fixed along the printed line due to the large contact-angle hysteresis of the slide surface whose properties were rough and hydrophobic. Such roughness was more advantageous over smoothness due to the large contact-angle hysteresis of water and the good wettability of the ink. Using a syringe pump, the water was able to continuously flow through a 1 mm wide and 0.13 mm deep channel without flooding.

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Section: Mechanism To Cause Water To Flow Through a Channel Without Ssupporting

confidence: 73%

“…However, some groups have recently reported surface-directed channels that are not pipes [6][7][8][9][10][11][12][13]. These channels were constructed between parallel top and bottom glass slides separated by a spacer.…”

Section: Introductionmentioning

confidence: 99%

Microchannels Constructed on Rough Hydrophobic Surfaces

Watanabe

2008

Chem Eng & Technol

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“…As an emerging alternative to the conventional microfluidics, surface microfluidic networks, defined by surface micropatterns with sufficient wettability contrast (i.e., hydrophobic patterns on hydrophilic substrate, or vice versa) have intrinsically overcome several technical challenges encountered in the closed-channel counterpart (Piorek et al 2007;West et al 2007;Watanabe 2009b). For instance, the exposed gas-liquid interface completely eliminates bubble trapping and cavitation obstruction (Skelley and Voldman 2008;Watanabe 2009a).…”

Section: Introductionmentioning

confidence: 99%

Surface microfluidics fabricated by photopatternable superhydrophobic nanocomposite

Hong

Pan

2010

Microfluid Nanofluid

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Surface microfluidics can be of potential use in a variety of emerging applications, including biological and chemical analysis, cellular detection and manipulation, high-throughput pharmaceutical screening, and etc. In comparison with the conventional closed-channel microfluidic system, surface microfluidics shows the distinct advantages of simple construction, direct surface access, no cavitation or interphase obstruction, clear optical path, easy fluidic packaging, and device reusability. In this article, we first present surface microfluidic networks microfabricated by a single-step lithographic process using a novel superhydrophobic photosensitive nanocomposite formula. The photopatternable superhydrophobic nanocomposite (PSN) incorporates PTFE nanoparticles into a SU-8 matrix, in which superhydrophobicity (contact angle of above 160°) is primarily contributed by the extremely low chemical energy and nano-topology of PTFE nanoparticles, while the SU-8 polymer matrix offers photopatternability (lithographic resolution of 10 lm) and substrate adhesion. Moreover, an additive intermediate layer with hydrophilic sidewall considerably reduces flow resistance while improving the substrate adhesion, as a crucial improvement from the previous surface flow configuration. Furthermore, self-propelled microfluidic networks driven by surface tension-induced pressure gradient have been fabricated and characterized to demonstrate the applicability of the novel nanocomposite fabrication approach.

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“…Typically, a 3D profile or a 2D stripe zone with higher surface energy, on the substrate, can help to prevent the pinch-off or the formation of bulges on such rivulets that would occur otherwise as the consequence of a capillary-originating instability (Lenz 1999;Brinkmann and Lipowsky 2002;Brinkmann and Blossey 2004;Speth and Lauga 2009). For example, West et al (2007) used microplasma patterning of glass surfaces modified with dichlorodimethylsiloxane giving rise to flat aqueous liquid straight or Y-shaped patterns. In the same way, local degradation of PDMS by O 2 exposure using microscale plasma activated templating technique (lPLAT) provided 900 lm wide channels with 15°TCA after PDMS curing (Chao et al 2007).…”

Section: Introductionmentioning

confidence: 98%

Simple and low-cost fabrication of PDMS microfluidic round channels by surface-wetting parameters optimization

Ville

Coquet

Brunet

et al. 2011

Microfluid Nanofluid

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Convenient for both biologists and MEMS designers, Polydimethylsiloxane (PDMS) polymer is intensively investigated for its biocompatibility, transparency, high resistance under plasma treatment, flexibility and resistance to high temperature. However, for microfluidic applications, the fabrication of PDMS circular channels is difficult to achieve except by wire moulding. In this article, we present a simple, fast and low-cost fabrication method which can be applied out of clean-room environment. It is based on the deposition of alginic acid sodium salt aqueous solution, enabling the formation of a liquid cylinder on the most hydrophilic part of a hydrophilic/hydrophobic patterned surface. We experimentally studied the interaction between liquid rivulets and surfaces presenting a contrast of wettability and/or a stepwise texture. Subsequent moulding of the half-cylinder of liquid produces round PDMS microfluidic channels. The optimal parameters for hydrophilic/hydrophobic patterns have then been applied to produce the roundest possible channels. The realisation of both straight channels 300-500 lm wide, 1 cm long and 75°t angent chord angle at best, and Y-shaped channels with the same dimensions and 55°TCA is demonstrated.

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Microplasma writing for surface-directed millifluidics

Abstract: Hydrophilic patterns were directly written on a hydrophobic glass substrate with a microplasma jet and used for surface-directed capillary flow operations.

Cited by 47 publications

References 15 publications

Microchannels Constructed on Rough Hydrophobic Surfaces

Microchannels Constructed on Rough Hydrophobic Surfaces

Surface microfluidics fabricated by photopatternable superhydrophobic nanocomposite

Simple and low-cost fabrication of PDMS microfluidic round channels by surface-wetting parameters optimization

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