Droplet motion on a wrinkled PDMS surface with a gradient structural length scale shorter than the droplet diameter

Yamada, Yutaka; Isobe, Kazuma; Horibe, Akihiko

doi:10.1039/d1ra09244h

Cited by 4 publications

(4 citation statements)

References 37 publications

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“…After cooling, the surface of PDMS—now with deposited metal on it—returns to its initial state, and wrinkles are formed. The result is coherent with the state of the art [ 20 , 21 , 22 , 23 , 24 , 25 ]. Therefore, the PDMS/metal wrinkles, shown in Figure 2 c,d, result from the plasma treatment which occurs in the course of sputtering.…”

Section: Resultssupporting

confidence: 85%

“…The authors also fabricated tailored wrinkles based on Cu and thin PDMS [ 21 ]. Promising applications for tailored wrinkled soft metalized layers [ 22 , 23 ] include strain sensors [ 24 ] and droplet motion devices [ 25 ]. However, considering the published works, there is no clear and univocal understanding of the wrinkle formation mechanism and behavior of large-area freestanding metallized soft polymer layers.…”

Section: Introductionmentioning

confidence: 99%

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Wrinkled Thermo-Electric Meander-Shaped Element on a Thin Freestanding PDMS Membrane

Bakhchova,

Deckert,

Steinmann

2023

Membranes

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Natural wrinkling of metal films on silicone substrates can appear by means of the metal sputtering process and can be described by the continuous elastic theory and non-linear wrinkling model. Here, we report the fabrication technology and behavior of thin freestanding Polydimethylsiloxane (PDMS) membranes equipped with thermo-electric meander-shaped elements. The Cr/Au wires were obtained on the silicone substrate by magnetron sputtering. We observe wrinkle formation and suppose furrows appear once PDMS returns to its initial state after the thermo-mechanical expansion during sputtering. Although the substrate thickness is usually a negligible parameter in the theory of wrinkle formation, we found that the self-assembled wrinkling architecture of the PDMS/Cr/Au varies due to the membrane thickness of 20 µm and 40 µm PDMS. We also demonstrate that the wrinkling of the meander wire affects its length, and it causes a 2.7 times higher resistance compared to a calculated value. Therefore, we investigate the influence of the PDMS mixing ratio on the thermo-electric meander-shaped elements. For the stiffer PDMS with a mixing ratio of 10:4, the resistance due to wrinkle amplitude alterations is 25% higher compared to the PDMS of ratio 10:1. Additionally, we observe and describe a thermo-mechanically induced motion behavior of the meander wires on completely freestanding PDMS membrane under applied current. These results can improve the understanding of wrinkle formation, which influences thermo-electric characteristics and may promote the integration of this technology in applications.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Wrinkled Thermo-Electric Meander-Shaped Element on a Thin Freestanding PDMS Membrane

Bakhchova,

Deckert,

Steinmann

2023

Membranes

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“…26 Recent work has shown that the motion of droplets on a solid surface is significantly affected by the morphology of the surface. 27 Liu et al 28 demonstrated that mechanical measurement methods can be used to characterize the wettability of solid surfaces; such measurement techniques also represent an effective method to quantify the lateral friction force at the solid-liquid interface. Mannetje et al 29 used a simple force sensor based on capillary optical imaging to characterize the hysteresis motion of the drop along the surface.…”

Section: Introductionmentioning

confidence: 99%

Analysis of water droplet motion on hydrophobic surfaces with different microstructures

Zhang,

Feng,

et al. 2024

J of Applied Polymer Sci

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The influence of material surface microstructure on interface properties is crucial for the preparation and development of special functional materials. In this paper, polydimethylsiloxane‐based superhydrophobic surfaces of varying roughness and surface energy are prepared using the template method and a spraying technique, and the effect of surface microstructure on lateral friction is studied using a lateral friction detection system. The experimental results indicate that as the surface roughness of a sample decreases, it is observed that the water droplets transition from a Cassie state to a Wenzel state. When the roughness changes from 4.619 μm, reduce to 3.512 μm, the maximum static friction force increases from 33.59 μN increased to 51.52 μN. The lateral sliding friction force ranges from 15.87 ± 1.9 μN increases to 40.91 ± 1.2 μN. For a given surface roughness, when the surface energy is reduced, the water droplets on the surface can be seen to transition from a Wenzel state to a Cassie state, the maximum static friction force increases from 19.32 μN dropped to 9.23 μN, and the lateral sliding friction force increases from 15.26 ± 1.6 μN dropped to 3.47 ± 2.1 μN. However, this behavior is distinct from that observed when changing the roughness of the sample. Studying the influence of the surface microstructure on the lateral friction force observed at a solid–liquid interface can provide important insights into novel geometries that may be used in new, advanced functional surfaces.

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“…17,18 Creating wettability gradients on soft surfaces especially on polydimethylsiloxane (PDMS) is of great interest due to the potential applications in microfluidics, self-cleaning surfaces, smart devices, etc. 1,[19][20][21][22][23] Wettability gradients induced by chemical gradients have been prepared by the surface modifications of soft surfaces through various chemical treatments like plasma treatment, the immersion technique, electrochemical methods, etc. [24][25][26] Wettability gradients from morphological gradients can be prepared by controlled variation of the surface roughness, shape, size, etc.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of stable wettability gradients on elastomeric surfaces for applications in water collection and controlled cell adhesion

et al. 2023

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Droplet motion on a wrinkled PDMS surface with a gradient structural length scale shorter than the droplet diameter

Abstract: Gradient wrinkled PDMS surfaces were fabricated through metal film deposition with installation of a mask and the motion of impinged droplets on the surfaces followed the structural gradient.

Cited by 4 publications

References 37 publications

Wrinkled Thermo-Electric Meander-Shaped Element on a Thin Freestanding PDMS Membrane

Wrinkled Thermo-Electric Meander-Shaped Element on a Thin Freestanding PDMS Membrane

Analysis of water droplet motion on hydrophobic surfaces with different microstructures

Facile fabrication of stable wettability gradients on elastomeric surfaces for applications in water collection and controlled cell adhesion

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