Phase Separation in Wetting Ridges of Sliding Drops on Soft and Swollen Surfaces

Hauer, Lukas; Cai, Zhuoyun; Skabeev, Artem; Vollmer, Doris; Pham, Jonathan T.

doi:10.1103/physrevlett.130.058205

Cited by 18 publications

(28 citation statements)

References 62 publications

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“…We shadowgraphically visualize wetting ridges at high spatio-temporal resolution (Figure 6.1), for various substrate materials and wetting liquids, to test the existing scaling relations. With this approach, we show that neither of the former explanation attempts [143,144,145,146,147,148,133,149,150,151,154,128,155,156,157] delivers a consistent description of the observations.…”

Section: Introductionmentioning

confidence: 81%

“…This indicates that the zero-frequency loss modulus is not a good parameter for the scaling behavior of the ridge profile. It rather motivates the existence of poroelastic relaxation [165] or an oil skirt [155,157] extracted from the gel by the contact line.…”

Section: Discussionmentioning

confidence: 99%

“…h ′ (q) = −i ℓs ℓ skirt sin q ℓ skirt ℓs µ(v q)/χ(q) + q 2 , (6.5) , a skirt with ℓ skirt ∼ 0.86ℓ s is required, corresponding to 150 µm and 41 µm for the soft and the stiff gels, respectively. In the light of recent direct visualizations of oil skirts for static [155] and moving [157] contact lines on artificially swollen networks, this estimate appears unreasonably large.…”

Section: Quasi-static Ridge Anglesmentioning

confidence: 95%

“…In case (iii), the three-phase line is no longer located at the solid surface. Instead, an oil skirt [155,157] with a negative laplace pressure p skirt transmits the normal force of the liquidliquid or liquid-air interface, γ sin θ, onto the solid, distributed over a width ℓ skirt : p skirt = γ sin θ/ℓ skirt . Figure 6.6 shows a sketch of this wetting configuration.…”

Section: Quasi-static Ridge Anglesmentioning

confidence: 99%

“…Still, well-defined angles have been observed experimentally at the three-phase line [137,138,140,141]. Recently, a debate on the contributing forces has emerged, and various mechanisms that could alter the force balance have been proposed, both in static and dynamic situations, including strain-dependent solid surface tensions [142,143,144,145,146,147,148,133], surface adaptation [149], concentrated line loads due to non-linear elastic bulk stresses [150,151], geometric and non-linear rheological effects [152,153], as well as extraction of free polymer chains from the gel [154,128,155,156,157].…”

Section: Introductionmentioning

confidence: 99%

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Wetting dynamics on soft surfaces

Jeon¹

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First and foremost, thank you Stefan for your guidance through the 4 years of my PhD. I am quite sure it was very tough to supervise a chemist with not so much knowledge in Physics, but you did so very patiently throughout my entire PhD. I learnt a lot from you, and really enjoyed working with you. I hope you will have a blast in Konstanz and I wish your family the very best in the future! Thank you! Also, I would like to thank Dr. Isabella Guido, and Prof. Marcus Müller for their co-supervision throughout my PhD as thesis committee members. Thank you Prof. Philipp Vana, Prof. Timo Betz, and Prof. Ulrich Parlitz for agreeing to be part of my examination board. Thank you Youchuang for being an awesome colleague and a friend. I will miss our random scientific/non-scientific discussions and your endless supply of fruits! Good luck with your new position in Harbin and don't forget me if you get a Nobel prize! Thank you Prashanth for being a very supportive friend. I always felt so relaxed after talking to you about things in life. I will miss you wandering around the corridors of the institute and randomly dropping by my office/labs! Have fun in Twente and good luck with the rest of your PhD! Thank you Olinka for being a nice office and groupmate! I still remember my first day at the institute and you were very friendly! I miss you and hope you are enjoying your time in Mexico! Thank you Ajinkya for being one of my best friends at the institute. I enjoyed chilling with you at 5pm in your office in the beginning of my PhD! Thank you Jan for being a cool football and gym buddy. I was always amazed by your beer drinking speed! I would also like to thank the other members of my group: Antaran, Franziska, and Maximilian. I will definitely miss everyone! Thank you Kris for your help with microscopes and other instruments, and also for the nice Ludwigstein retreat! Thank you Monika, Guido, Thomas, and Wolf for your help so far. I want to thank the other friends from the institute: Xin, Sebastian, Akinori, Swati, and Michiel. I'm glad that we still keep in touch even years after you leave the institute. Thank you old colleagues and friends who are now in Bayreuth, Rodrigo, Cote, and Alex. Thank you for your hospitality whenever I visit Bayreuth. Thank you Kenny for your awesome barbeque parties and random jokes in the middle of the German class! Thank you friends in the other side of the world-Hyesu, Crystal, Devico, McZingers, Jit Wu, and so on. I miss all of you! Thank you Antoine for being the best person in my life. I am very glad to have met you at this institute. Thank you for your continuous support throughout my PhD and always being there for me.Last but not least, I want to thank my parents for their endless love and support ever since the day I was born. We went through many tough events in the past two years, but we managed to stay solid as a family and continued to love each other. I dedicate my thesis to them and my grandma, whom I dearly miss.

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Section: Introductionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Quasi-static Ridge Anglesmentioning

confidence: 95%

Section: Quasi-static Ridge Anglesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wetting dynamics on soft surfaces

Jeon¹

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A Flexible and Electrically Conductive Liquid Metal Adhesive for Hybrid Electronic Integration

Pozarycki,

Zu,

Wilcox

et al. 2024

Adv Funct Materials

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Electrical and mechanical integration approaches are essential for emerging hybrid electronics that must robustly bond rigid electrical components with flexible circuits and substrates. However, flexible polymeric substrates and circuits cannot withstand the high temperatures used in traditional electronic processing. This constraint requires new strategies to create flexible materials that simultaneously achieve high electrical conductivity, strong adhesion, and processibility at low temperature. Here, an electrically conductive adhesive is introduced that is flexible, electrically conductive (up to 3.25×105 S m−1) without sintering or high temperature post‐processing, and strongly adhesive to various materials common to flexible and stretchable circuits (fracture energy 350 <Gc < 700 J m−2). This is achieved through a multiphase soft composite consisting of an elastomeric and adhesive epoxy network with dispersed liquid metal droplets that are bridged by silver flakes, which form a flexible and conductive percolated network. These inks can be processed through masked deposition and direct ink writing at room temperature. This enables soft conductive wiring and robust integration of rigid components onto flexible substrates to create hybrid electronics for emerging applications in soft electronics, soft robotics, and multifunctional systems.

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Humidity‐Responsive Polyvinyl Alcohol/Microcrystalline Cellulose Composites with Shape Memory Features for Hair‐Styling Applications

Uto,

Liu,

et al. 2023

Adv Materials Inter

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This study investigates the maintenance of humidity‐responsive shape memory polymer composites comprising polyvinyl alcohol (PVA) and cellulose microcrystal for maintaining hair curls in humid environments. The composite films are prepared by a simple blending method using aqueous solutions of different polymer ratios and characterized for thermal properties, chemical structure, and surface morphology. The hydroxyl groups in the PVA and cellulose provided hydrogen‐bonding interactions and improved the miscibility of the composites. Increasing the cellulose content in the composites enhanced mechanical properties and curl‐shape recovery performance, with 20–25 wt.% cellulose achieving maximum recovery. When the PVA/cellulose solution is applied to natural hair, it effectively maintains the shape of curled hair bundles for at least 6 h under 80% humidity and promotes the hair shape recovery rate to 8–10%. Overall, The proposed humidity‐responsive PVA/cellulose composites present promising application potential in the field of hairstyling to withstand humid weather.

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Phase Separation in Wetting Ridges of Sliding Drops on Soft and Swollen Surfaces

Cited by 18 publications

References 62 publications

Wetting dynamics on soft surfaces

Wetting dynamics on soft surfaces

A Flexible and Electrically Conductive Liquid Metal Adhesive for Hybrid Electronic Integration

Humidity‐Responsive Polyvinyl Alcohol/Microcrystalline Cellulose Composites with Shape Memory Features for Hair‐Styling Applications

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