Nanostructuring of a Polymeric Substrate with Well-Defined Nanometer-Scale Topography and Tailored Surface Wettability

Lee, Woo; Jin, Michelle; Yoo, Won-Cheol; Lee, Jin-Kyu

doi:10.1021/la049411+

Cited by 401 publications

(306 citation statements)

References 25 publications

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“…Researchers have created several superhydrophobic surfaces where water drops roll off, removing surface contamination, an effect observed on the lotus leaf and several other life forms in nature [1], [2] and [3]. In general, the contact angle of water on smooth flat hydrophobic surfaces, such as Teflon, does not exceed 120° [4].…”

mentioning

confidence: 99%

Superhydrophobic properties of ultrathin rf-sputtered Teflon films coated etched aluminum surfaces

2008

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Superhydrophobicity has been demonstrated on ultrathin rf-sputtered Teflon coated etched aluminum surfaces. The etching of aluminum surfaces has been performed using dilute hydrochloric acid. An optimized etching time of 2.5 min is found to be essential, before Teflon coating, to obtain a highest water contact angle of 164 ± 3° with a lowest contact angle hysteresis of 2.5 ± 1.5°, with the water drops simply rolling off these surfaces with even the slightest inclination of the sample. The presence of − CF3 radicals along with − CF2 radicals in the ultrathin rf-sputtered Teflon films, as investigated by X-ray photoelectron spectroscopy (XPS), contributes to the lowering of the surface energy on the aluminum surfaces. The presence of patterned microstructure as revealed by field emission scanning electron microscope (FESEM) together with the low surface energy ultrathin rf-sputtered Teflon films renders the aluminum surfaces highly superhydrophobic.

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mentioning

confidence: 99%

Superhydrophobic properties of ultrathin rf-sputtered Teflon films coated etched aluminum surfaces

2008

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“…In general, biofouling on superhydrophobic surfaces wash off more easily (self-cleaning) when compared with superhydrophilic surfaces. Images show a variety of examples found in nature, including the hydrophilic elephant [26] ear (Alocasia odora) [87], microtextured shark skin (Carcharhinus galapagensis) [99], hydrophobic water fern (Regnellidium diphyllum) [87] and superhydrophobic nanocolumns on an insect wing (Cicada orni) [100].…”

Section: (C) Surface Factorsmentioning

confidence: 99%

“…Submerged fish scales are oil resistant because of their hierarchical structure, which consists of 4-5 mm diameter scales covered by papillae 100-300 mm long and 30-40 mm wide [114]. Other superhydrophobic examples include broccoli, lady mantle and the insect cicada [100,104].…”

Section: (A) Lessons From Naturementioning

confidence: 99%

Biofouling: lessons from nature

Bixler

Bhushan

2012

Phil. Trans. R. Soc. A.

451

358

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Biofouling is generally undesirable for many applications. An overview of the medical, marine and industrial fields susceptible to fouling is presented. Two types of fouling include biofouling from organism colonization and inorganic fouling from non-living particles. Nature offers many solutions to control fouling through various physical and chemical control mechanisms. Examples include low drag, low adhesion, wettability (water repellency and attraction), microtexture, grooming, sloughing, various miscellaneous behaviours and chemical secretions. A survey of nature's flora and fauna was taken in order to discover new antifouling methods that could be mimicked for engineering applications. Antifouling methods currently employed, ranging from coatings to cleaning techniques, are described. New antifouling methods will presumably incorporate a combination of physical and chemical controls.

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“…18 Their repellent properties are based on the creation of a composite air/solid interface by introducing topographic features at the micro-and nanoscale to a surface bearing a chemical functionality that maximizes the contact angle with the liquid to be repelled. [19][20][21][22] Liquids with high surface tensions, predominantly water, can easily be prevented from inltrating the roughness features; resting on a cushion of air and being in contact only with the tips of the structures. This wetting scenario is known as the Cassie-Baxter state.…”

Section: -17mentioning

confidence: 99%

Tailoring re-entrant geometry in inverse colloidal monolayers to control surface wettability

et al. 2016

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Controlling the microscopic wetting state of a liquid in contact with a structured surface is the basis for the design of liquid repellent as well as anti-fogging coatings by preventing or enabling a given liquid to infiltrate the surface structures. Similarly, a liquid can be confined to designated surface areas by locally controlling the wetting state, with applications ranging from liquid transport on a surface to creating tailored microenvironments for cell culture or chemical synthesis. The control of the wetting of a low-surfacetension liquid is substantially more difficult compared to water and requires surface structures with overhanging features, known as re-entrant geometries. Here, we use colloidal self-assembly and templating to create two-dimensional nanopore arrays with tailored re-entrant geometry. These pore arrays, termed inverse monolayers, are prepared by backfilling a sacrificial colloidal monolayer with a silica sol-gel precursor material. Varying the precursor concentration enables us to control the degree to which the colloids are embedded into the silica matrix. Upon calcination, nanopores with different opening angles result. The pore opening angle directly correlates with the re-entrant curvature of the surface nanostructures and can be used to control the macroscopic wetting behavior of a liquid sitting on the surface structures. We characterize the wetting of various liquids by static and dynamic contact angles and find correlation between the experimental results and theoretical predictions of the wetting state based on simple geometric considerations. We demonstrate the creation of omniphobic surface coatings that support Cassie-Baxter wetting states for liquids with low surface tensions, including octane (g ¼ 21.7 mN m À1). We further use photolithography to spatially confine such low-surface-tension liquids to desired areas of the substrate with high accuracy.

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Nanostructuring of a Polymeric Substrate with Well-Defined Nanometer-Scale Topography and Tailored Surface Wettability

Cited by 401 publications

References 25 publications

Superhydrophobic properties of ultrathin rf-sputtered Teflon films coated etched aluminum surfaces

Superhydrophobic properties of ultrathin rf-sputtered Teflon films coated etched aluminum surfaces

Biofouling: lessons from nature

Tailoring re-entrant geometry in inverse colloidal monolayers to control surface wettability

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