Glass-particle adhesion-force-distribution on clean (laboratory) and contaminated (outdoor) surfaces

Rush, Matthew N.; Brambilla, Sara; Speckart, Scott; Montaño, Gabriel A.; Brown, Michael J.

doi:10.1016/j.jaerosci.2018.06.002

Cited by 19 publications

(3 citation statements)

References 24 publications

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“…The surface roughness was about 72 ± 15 nm ( Figure S3 in Supplementary Materials ). For comparison, glass slides [ 66 , 67 ] or commercially available PMMA and COC wafers [ 68 ] displayed a surface roughness between 5 and 30 nm. The surface of neutralized chitosan films displayed a water contact angle of 99.5 ± 2.4°, indicating their hydrophobic character.…”

Section: Resultsmentioning

confidence: 99%

Chitosan as an Alternative to Oil-Based Materials for the Fabrication of Lab-on-a-Chip

Zimmer,

Trombotto,

Laurenceau

et al. 2024

Micromachines

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Given the growing importance of lab-on-a-chip in a number of fields, such as medical diagnosis or environmental analysis, the fact that the current fabrication process relies mainly on oil-based polymers raises an ecological concern. As an eco-responsible alternative, we presented, in this article, a manufacturing process for microfluidic devices from chitosan, a bio-sourced, biodegradable, and biocompatible polysaccharide. From chitosan powder, we produced thick and rigid films. To prevent their dissolution and reduce their swelling when in contact with aqueous solutions, we investigated a film neutralization step and characterized the mechanical and physical properties of the resulting films. On these neutralized chitosan films, we compared two micropatterning methods, i.e., hot embossing and mechanical micro-drilling, based on the resolution of microchannels from 100 µm to 1000 µm wide. Then, chitosan films with micro-drilled channels were bonded using a biocompatible dry photoresist on a glass slide or another neutralized chitosan film. Thanks to this protocol, the first functional chitosan microfluidic devices were prepared. While some steps of the fabrication process remain to be improved, these preliminary results pave the way toward a sustainable fabrication of lab-on-a-chip.

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Section: Resultsmentioning

confidence: 99%

Chitosan as an Alternative to Oil-Based Materials for the Fabrication of Lab-on-a-Chip

Zimmer,

Trombotto,

Laurenceau

et al. 2024

Micromachines

View full text Add to dashboard Cite

show abstract

“…Such models were later refined to include wall roughness [16]. Using atomic force microscopy, surface roughness measurements and contact mechanics, Brambilla et al [17,18] revisited the calculation of the adhesion and lift torques induced by the lever arm. Some of latest developments found in the literature indicates that the resuspension of an isolated particle from a surface occurs following a combination of three mechanisms: (i) a particle is first set in motion by the fluid action, (ii) it then translates on the rough substrate by either rolling, sliding, or a combination of both, and (iii) it finally detaches from the surface to re-enter the flow upon colliding with a surface asperity [19,20].…”

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confidence: 99%

“…This initial resuspension stage, where roughly 25% of the particles resuspend, is triggered by the motion of particles that loosely adhere to the wall surface. A loosely adhering particle is one, whose adhesion force is at the lower end of the adhesion force distribution [17]. More precisely, these loosely adhering particles start rolling and ram into their neighbors to eventually cause a local clustered resuspension.…”

mentioning

confidence: 99%