Thickness and Elastic Modulus of Plasma Treated PDMS Silica-like Surface Layer

Befahy, Stéphane; Lipnik, P.; Pardoen, Thomas; Nascimento, Cristiane Santos; Patris, Benjamin; Bertrand, Patrick; Yunus, Sami

doi:10.1021/la903154y

Cited by 141 publications

(133 citation statements)

References 22 publications

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“…A more direct way of estimating thickness would be to use transmission election microscopy to measure the thickness as a function of oxidation time. Béfahy et al used this approach to investigate the silicate growth for different plasma conditions [21]. Fitting and extrapolating their results to our conditions, the predicted growth rate is ~15 nm/min which is in agreement with our result [21].…”

Section: Discussionsupporting

confidence: 87%

“…Béfahy et al used this approach to investigate the silicate growth for different plasma conditions [21]. Fitting and extrapolating their results to our conditions, the predicted growth rate is ~15 nm/min which is in agreement with our result [21]. Speculating that the oxidized surface layer is more brittle than the intact PDMS, we considered the failure mode of the oxide skin.…”

Section: Discussionsupporting

confidence: 82%

“…Surface modification typically includes oxidation of the PDMS surface to introduce functional hydroxyl groups that temporarily render the surface hydrophilic [18]. Previous studies have used X-ray photoelectron spectrometry (XPS) [19], scanning electron microscopy (SEM) [20] or transmission electron microscopy (TEM) [21], atomic force microscopy (AFM) [22], and film buckling [23][24][25][26] to show that the oxidation of bulk PDMS forms a thin silicate layer on the surface. However, micropost stiffness characterization [10,11,13-16,27,27] is typically conducted only before oxidation and neglects oxidation effects.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxidation stiffening of PDMS microposts

Sim

Taylor

Larsen

et al. 2015

Extreme Mechanics Letters

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This paper presents guidance for analyzing the stiffness changes of micropost arrays after oxidation. Numerous mechanobiology studies exploit micropost arrays to quantify cell-generated micropost displacements and traction forces. Cell adhesion requires surface functionalization typically facilitated by an oxidation step, which can form a glassy skin. We estimate the material properties of this skin, analytically calculate the stiffness of oxidized microposts and compare it with direct measurements. We find correction factors increase exponentially with decreasing micropost diameter. Ignoring this oxidation stiffening of microposts results in more than 200% underestimation in micropost stiffness as well as the cellular traction forces extracted from micropost deflections.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Oxidation stiffening of PDMS microposts

Sim

Taylor

Larsen

et al. 2015

Extreme Mechanics Letters

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“…Like oxygen or air plasmas, UVO exposure of PDMS generates a glassy skin, albeit with a much larger thickness and non-uniform profile 38,41 , resulting from the combined UV exposure and oxygen reactivity at the surface. Employing XRR, we resolve the densification of the PDMS surface upon UVO oxidised PDMS, as shown in Figure 3, whose SLD is shown in Figure 3c.…”

Section: Double Frontal Uvo and Air Plasma Oxidation Approachmentioning

confidence: 99%

Sub-100 nm wrinkling of polydimethylsiloxane by double frontal oxidation

et al. 2017

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We demonstrate nanoscale wrinkling on polydimethylsiloxane (PDMS) at sub-100 nm length scales via a (double) frontal surface oxidation coupled with a mechanical compression. The kinetics of the glassy skin propagation is resolved by neutron and X-ray reflectivity, and atomic force microscopy, combined with mechanical wrinkling experiments to evaluate the resulting pattern formation. In conventional PDMS surface oxidation, the smallest wrinkling patterns attainable have an intrinsic lower wavelength limit due to the coupling of skin formation and front propagation at fixed strain ε prestrain , whose maximum is, in turn, set by material failure. However, combining two different oxidative processes, an ultra-violet ozonolysis followed by air plasma exposure, we break this limit by fabricating trilayer laminates with excellent interfacial properties and a sequence of moduli and layer thicknesses able to trivially reduce the surface topography to sub-100 nm dimensions. This method provides a powerful, yet simple, non-lithographic approach to extend surface patterning from visible to the deep UV range.

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“…o C로 저온에서도 유연성이 유지될 수 있는 [15][16][17] polydimethylsiloxane (PDMS)이 일반적으로 사용되고 있 다. 1,3,[18][19][20] Silicone 계열의 고분자인 PDMS는 backbone이…”

Section: )unclassified

Elastic Modulus of Locally Stiffness-variant Polydimethylsiloxane Substrates for Stretchable Electronic Packaging Applications

Oh¹,

Park²,

Han³

et al. 2015

Journal of the Microelectronics and Packaging Society

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In order to apply to stretchable electronics packaging, locally stiffness-variant stretchable substrates consisting of island structure were fabricated by combining two polydimethylsiloxane elastomers of different stiffnesses and their elastic moduli were characterized as a function of the width of the high-stiffness island. The low-stiffness substrate matrix and the embedded high-stiffness island of the stretchable substrate were formed by using Dragon Skin 10 of the elastic modulus of 0.09 MPa and Sylgard 184 of the elastic modulus of 2.15 MPa, respectively. A stretchable substrate was fabricated to be a configuration of 6.5-cm length, 0.4-cm thickness, and 2.5-cm width, in which a high-stiffness Sylgard 184 island, of 4-cm length, 0.2-cm thickness, and 0.5~1.5-cm width, was embedded. The elastic modulus of a stretchable substrate was increased from 0.09 MPa to 0.16 MPa by incorporating the Sylgard 184 island of 0.5-cm width to Dragon Skin 10 substrate matrix. The elastic modulus was further improved to 0.18 MPa and 0.2 MPa with increasing the Sylgard 184 island width to 1.0 cm and 1.5 cm, which were in good agreement with values estimated by combining the Voigt structure of isostrain and the Reuss structure of isostress.

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Thickness and Elastic Modulus of Plasma Treated PDMS Silica-like Surface Layer

Cited by 141 publications

References 22 publications

Oxidation stiffening of PDMS microposts

Oxidation stiffening of PDMS microposts

Sub-100 nm wrinkling of polydimethylsiloxane by double frontal oxidation

Elastic Modulus of Locally Stiffness-variant Polydimethylsiloxane Substrates for Stretchable Electronic Packaging Applications

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