Study on the surface energy characteristics of polydimethylsiloxane (PDMS) films modified by C4F8/O2/Ar plasma treatment

Kim, Yong Geun; Lim, Nomin; Kim, Jihun; Kim, Changmok; Lee, Junmyung; Kwon, Kwang‐Ho

doi:10.1016/j.apsusc.2017.11.009

Cited by 33 publications

(15 citation statements)

References 26 publications

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“…Surface energy values estimated using the binary mixture method are in reasonable agreement with values reported previously. ,− For example, Lee et al reported 12.54, 11.05, and 1.49 mN/m for γ S , γ S d , and γ S p , respectively. These values are comparable to those estimated here.…”

Section: Resultssupporting

confidence: 88%

Binary Liquid Mixture Contact-Angle Measurements for Precise Estimation of Surface Free Energy

et al. 2019

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Surface free energy remains a fundamental material property to characterize the interfacial interactions between liquid and solid. Here, we developed a precise approach to determine surface energy by using contact angles of binary mixtures of water–dimethyl sulfoxide (DMSO), water–formamide, water–ethylene glycol, and water–glycerol and analyzed using the Owens–Wendt method. A mixing equation was developed to estimate liquid-dispersive surface tension (γL,mix d) and polar surface tension (γL,mix p) parameters for binary mixtures. To test the approach, two hydrophobic surfaces, flat polydimethylsiloxane (PDMS), and silane-derivatized glass were prepared and the contact angle of mixtures on the surfaces were obtained. Surface energy of PDMS determined by three binary mixtures agrees with that from pure solvents, but the uncertainty decreases to less than 13%; remarkably, the uncertainty drops to around 5% once we combined measured contact angles from all the mixtures, namely, water–DMSO, water–formamide, and water–ethylene glycol. Surface energies of silane-derivatized glass bearing ethyl (C2), hexyl (C6), and octadecyl (C18) alkyl chains were determined with water–formamide and water–glycerol mixtures. Measured contact angles fit the Owens–Wendt model, and surface energy value determined from different binary mixtures agree with each other within error. Contact angle measurement of liquid mixtures is a simple method for determination of surface energy that improves the precision of surface energy determined by measurements of multiple pure solvents.

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Section: Resultssupporting

confidence: 88%

Binary Liquid Mixture Contact-Angle Measurements for Precise Estimation of Surface Free Energy

et al. 2019

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“…First, the PDMS/OTS@SiO 2 based surface has excellent superhydrophobicity, large WCA, low surface energy, and low surface roughness. The large WCA leads to smaller contact area between water droplets and the surface, reducing the heat transfer rate between the cold surface and water droplets. , This also leads to a reduction in the contact area between the ice and the surface, thereby improving the anti-icing performance and reducing ice adhesion. The lower surface energy results in smaller van der Waals forces between the ice and the surface, resulting in lower ice adhesion.…”

Section: Resultsmentioning

confidence: 99%

“…The lower surface energy (1.4 mN/m) of OTS@SiO 2 was also key role for the above result compared to that (11.0 mN/m) of pure PDMS. 31,32 Although the PDMS/ SiO 2 based surface had a roughness similar to that of the SiO 2 based surface, it yet showed a larger WCA and a smaller SA. These results could be attributed to the synergistic effect of the soft PDMS microspheres and stiff OTS@SiO 2 nanoparticles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Ultralow Icing Adhesion of a Superhydrophobic Coating Based on the Synergistic Effect of Soft and Stiff Particles

Cheng

Yang

et al. 2021

Langmuir

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A novel superhydrophobic coating composed of soft polydimethylsiloxane microspheres and stiff SiO 2 nanoparticles was developed and prepared. This superhydrophobic coating showed excellent superhydrophobicity with a large water contact angle of 171.3°and also exhibited good anti-icing performance and ultralow icing adhesion of 1.53 kPa. Furthermore, the superhydrophobic coating displayed good icing/deicing cycle stability, in which the icing adhesion was still less than 10.0 kPa after 25 cycles. This excellent comprehensive performance is attributed to stress-localization between ice and the surface, resulting from the synergistic effect of soft and stiff particles. This work thus opens a new avenue to simultaneously optimize the antiicing and icephobic performance of a superhydrophobic surface for various applications.

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“…For a given final temperature (here 4 °C), we found t i to increase from ∼35 s on plasma-treated glass (contact angle ≈ 8°) to ∼80 s on polycarbonate PC (contact angle ≈ 75°) and finally to ∼650 s on PDMS (contact angle ≈ 107°). The corresponding total surface free energy values reported in the literature are included in Figure c as a reference; see Figure SI3 for comparison of the impacts of polar and nonpolar surface energy contributions. − …”

Section: Resultsmentioning

confidence: 99%

Surface-Induced Crystallization of Sodium Dodecyl Sulfate (SDS) Micellar Solutions in Confinement

et al. 2020

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We investigate the role of confinement on the onset of crystallization in subcooled micellar solutions of sodium dodecyl sulfate (SDS), examining the impact of sample volume, substrate surface energy, and surface roughness. Using small angle neutron scattering (SANS) and dynamic light scattering (DLS), we measure the crystallization temperature upon cooling and the metastable zone width (MSZW) for bulk 10−30 wt% SDS solutions. We then introduce a microdroplet approach to quantify the impact of surface free energy (18−65 mN/m) and substrate roughness (R α ≃ 0−60 μm) on the kinetics of surface-induced crystallization through measurements of induction time (t i ) under isothermal conditions. While t i is found to decrease exponentially with decreasing temperature (increasing subcooling) for all tested surfaces, increasing the surface energy could cause a significant further reduction of up to ∼40 fold. For substrates with the lowest surface energy and longest t i , microscale surface roughness is found to enhance crystal nucleation, in particular for R α ≥ 10 μm. Finally, we demonstrate that tuning the surface energy and microscopic roughness can be effective routes to promote or delay nucleation in bulk-like volumes, thus greatly impacting the stability of surfactant solutions at lower temperatures.

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Study on the surface energy characteristics of polydimethylsiloxane (PDMS) films modified by C4F8/O2/Ar plasma treatment

Cited by 33 publications

References 26 publications

Binary Liquid Mixture Contact-Angle Measurements for Precise Estimation of Surface Free Energy

Binary Liquid Mixture Contact-Angle Measurements for Precise Estimation of Surface Free Energy

Ultralow Icing Adhesion of a Superhydrophobic Coating Based on the Synergistic Effect of Soft and Stiff Particles

Surface-Induced Crystallization of Sodium Dodecyl Sulfate (SDS) Micellar Solutions in Confinement

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