Role of uncrosslinked chains in droplets dynamics on silicone elastomers

Hourlier-Fargette, Aurélie; Antkowiak, Arnaud; Chateauminois, A.; Neukirch, Sébastien

doi:10.1039/c7sm00447h

Cited by 60 publications

(90 citation statements)

References 32 publications

(51 reference statements)

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“…Despite a reduction in surface tension of more than a factor of two, the results obtained here were quantitatively indistinguishable. Further, our surface tension measurements did not change when compared before and after the experiment: any free polymer chains released by the sheets did not modify the surface tension of our (relatively large bath) significantly, as recently reported for small droplets [36].…”

Section: Low Mechanical Bendability τsupporting

confidence: 81%

Indentation of a floating elastic sheet: geometry versus applied tension

et al. 2017

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The localized loading of an elastic sheet floating on a liquid bath occurs at scales from a frog sitting on a lily pad to a volcano supported by the Earth’s tectonic plates. The load is supported by a combination of the stresses within the sheet (which may include applied tensions from, for example, surface tension) and the hydrostatic pressure in the liquid. At the same time, the sheet deforms, and may wrinkle, because of the load. We study this problem in terms of the (relatively weak) applied tension and the indentation depth. For small indentation depths, we find that the force–indentation curve is linear with a stiffness that we characterize in terms of the applied tension and bending stiffness of the sheet. At larger indentations, the force–indentation curve becomes nonlinear and the sheet is subject to a wrinkling instability. We study this wrinkling instability close to the buckling threshold and calculate both the number of wrinkles at onset and the indentation depth at onset, comparing our theoretical results with experiments. Finally, we contrast our results with those previously reported for very thin, highly bendable membranes.

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Section: Low Mechanical Bendability τsupporting

confidence: 81%

Indentation of a floating elastic sheet: geometry versus applied tension

et al. 2017

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“…Here, they are induced at the length scale of microasperity contacts. For the Sylgard silicone used in our experiments, viscoelastic dissipation may especially arise from the presence of free chains [15] and dangling bonds [16] within the polymer network. Such viscoelastic effects are obviously not taken into account in the FT's theory which is based on an equilibrium description of adhesive contacts.…”

Section: A Pull-off Force and Total Contact Areamentioning

confidence: 99%

Adhesive Contact of Model Randomly Rough Rubber Surfaces

et al. 2019

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We study experimentally and theoretically the equilibrium adhesive contact between a smooth glass lens and a rough rubber surface textured with spherical microasperities with controlled height and spatial distributions. Measurements of the real contact area A versus load P are performed under compression by imaging the light transmitted at the microcontacts. A(P ) is found to be non-linear and to strongly depend on the standard deviation of the asperity height distribution. Experimental results are discussed in the light of a discrete version of Fuller and Tabor's (FT) original model (Proceedings of the Royal Society A 345 (1975) 327), which allows to take into account the elastic coupling arising from both microasperities interactions and curvature of the glass lens. Our experimental data on microcontact size distributions are well captured by our discrete extended model. We show that the elastic coupling arising from the lens curvature has a significant contribution to the A(P ) relationship. Our discrete model also clearly shows that the adhesioninduced effect on A remains significant even for vanishingly small pull-off forces. Last, at the local asperity length scale, our measurements show that the pressure dependence of the microcontacts density can be simply described by the original FT model.

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“…The mass loss observed for our material system is considerably larger than that reported for Sylgard 184 in ref. 29. Nevertheless our layers remained optically clear and the surface remained smooth and flat.…”

Section: Introductionmentioning

confidence: 78%

“…The black dots represent experiments using 2-propanol-treated samples, as described in ref. 29, to investigate the influence of uncrosslinked chains on the movement of droplets. Fig.…”

Section: Droplet Coalescencementioning

confidence: 99%

“…According to ref. 29, silicone polymers may still contain uncrosslinked chains after curing, which can be extracted by immersing the elastomer in a good solvent and subsequently deswelling it. We swelled different samples in toluene, p-xylene, ethyl acetate and 2-propanol for several days, refreshing the solution daily, then used a 1 : 1 mix by volume of the good solvent and ethanol for one day and pure ethanol for another day to deswell the samples.…”

Section: Introductionmentioning

confidence: 99%

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