Fabricating translucent polydimethylsiloxane (PDMS) super-hydrophobic surface greenly by facile water-dissolved fillers

Lin, Yung Tsan; Chou, Jung-Hua

doi:10.1080/01694243.2016.1145314

Cited by 11 publications

(3 citation statements)

References 31 publications

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“…Surfaces with very large contact angles can be created in a variety of manners, in many cases inspired by Nature itself . For example, one may create a rough surface by abrading fluorinated hydrophobic materials − or use particulates to create rough surfaces in curable liquid polymers such as polydimethylsiloxane. − In the current study, abrasion is chosen since it can be applied with very simple means to existing surfaces to get reasonably repeatable results when it comes to surface statistics and wetting. This further allowed a study of the triboelectric charge that formed when water droplets moved over the rough surface with different types of electrodes.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification

Helseth

2019

Langmuir

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When water comes in contact with a hydrophobic fluoropolymer, a triboelectric charge tends to form on the surface. Here, it is investigated how the triboelectric charge formed upon contact with water drops depends on the microscale surface statistics of the polymer. In particular, it is found that the transition to a superhydrophobic fakir state results in a considerable reduction in triboelectric contact charge, due to a reduced liquid–solid contact area. Thus, when processing charge-sensitive electronic systems one may want to utilize such surfaces promoting reduced tribocharging. This also has implications for energy harvesting purposes, where one may collect electrical energy by letting water droplets move on the polymer with an interdigitated current-collecting electrode on its back side. In such a situation, it is observed that the surfaces promoting the superhydrophobic fakir state give rise to larger water droplet velocities and smaller collected charge, which explains the need for careful assessment of surface treatment before applying microstructured polymers for water droplet energy harvesting.

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Section: Introductionmentioning

confidence: 99%

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification

Helseth

2019

Langmuir

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“…Increasing the height of the embossed microchannels increases the volume of air confined in the valleys. This air prevents water droplets from entering the troughs of microchannels, causing water droplets to settle at the peak of the microchannels and increasing the WCA ⟂ [26,48]. So in the next section, the type-IV pattern is considered for further analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Lin and Chou [26] manufactured micron-scaled cavities over the recycled polypropylene (PP) film just by pressing sea salt grains of 4 sizes (25 μm, 53 μm, 74 μm, 104 μm) on heated PP film. In the next step, PDMS was cast over the PP mold, vacuumed for 30 min, and cured in the hot oven at 80 °C for 1 h. After curing, it is peeled from the mold, and the positive protrusion patterns of various densities are developed.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of superhydrophobic surface by a dimensional change in surface topography of microchannel on polymer substrate through induction-aided hot embossing: parametric investigation and optimization

Deshmukh,

Rana,

Goswami

2023

Surf. Topogr.: Metrol. Prop.

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Hot embossing (HE) is a micro-fabrication technique employed to create micron-scale patterns on the polymer substrate. An in-house induction-assisted hot embossing (IHE) setup was fabricated to complete the embossing in a short duration as compared to traditional hot embossing process. This work alters the polymer surface topography to make it superhydrophobic for self-cleaning. Fiber laser machining was used to produce four-microchannel designs on an Aluminum-6061 plate in which the microchannel width was varied from 600 μm to 150 μm while maintaining a constant adjacent distance of 300 μm. This textured plate is employed as a mold in the IHE setup. IHE process parameters, embossing temperature, pressure, time, and deembossing temperature were varied to emboss the mold designs on a polyethylene terephthalate substrate. Thereafter, the embossed microchannel height, surface roughness, and water contact angle perpendicular to the embossed microchannels (WCA⟂) were calculated. The parametric analysis examined how operational factors affected the output. The experiment was done as per the central composite design (experimental design) part of the design-of-experiments useful in the response surface model. Parametric research demonstrates that embossed microchannel height and width had a maximum effect on WCA⟂. Type-IV microchannels with 150 μm width demonstrated the highest WCA⟂. The WCA⟂ was mostly impacted by embossed microchannel height; hence a regression model was created using type-IV channel height data. Analysis of variance showed that embossing temperature mainly impacts microchannel height. The recently invented Jaya-algorithm optimized this model to increase embossed microchannel height and WCA⟂. Setting the parameters at the best level predicted by Jaya-algorithm yielded an embossed microchannel height inaccuracy of 2.18%. The WCA⟂ measured on the surface of a sample prepared at the best parameters was found to be 154.71°± 2°. Lastly, FTIR (Fourier-transform-infrared-spectroscopy) test showed no chemical composition change between the embossed and bare samples.

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Mechanical and Optical Properties of Stretchable Silicon Nanocrystal/Polydimethylsiloxane Nanocomposites

Izadi

Toback

Sinha

et al. 2020

Physica Status Solidi (a)

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Nanoparticle‐infused polymer composites have long been an area of interest due to the typically stabilizing effects they have on the mechanical behavior of the composites, as well as added functionalities such as reduced surface resistance. Newer applications of these nanocomposites include dispersing optoelectronically functional nanoparticles in polymer matrices, for example, including luminescent nanocrystals in rigid slabs for luminescent solar concentrating photovoltaics and electrochromic panels. Dispersion of luminescent nanocrystals in stretchable polymers adds novel possibilities for applications, such as wearable health monitoring systems, flexible communications devices, and more. To leverage the exciting combined properties that these nanocomposites promise, there is a pressing need to evaluate and understand the interconnections between the optical effects, mechanical behavior, and the properties of the constituents. Herein, the optical and mechanical behavior of brightly emissive silicon nanocrystal/polydimethylsiloxane (PDMS) nanocomposites are investigated as a function of nanocrystal concentration and nanocrystal surface functionality. Mechanically, incorporating the nanocrystals at higher concentration leads to a dramatic reduction in the mechanical properties of the nanocomposite. The results suggest that the nanocrystal inclusions interfere with polymer cross‐linking, changing the mechanical behavior of the host PDMS as compared to the control.

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Fabricating translucent polydimethylsiloxane (PDMS) super-hydrophobic surface greenly by facile water-dissolved fillers

Cited by 11 publications

References 31 publications

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification

The Influence of Microscale Surface Roughness on Water-Droplet Contact Electrification

Fabrication of superhydrophobic surface by a dimensional change in surface topography of microchannel on polymer substrate through induction-aided hot embossing: parametric investigation and optimization

Mechanical and Optical Properties of Stretchable Silicon Nanocrystal/Polydimethylsiloxane Nanocomposites

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