Extreme tuning of wetting on 1D nanostructures: from a superhydrophilic to a perfect hydrophobic surface

Ali, Awadelkareem A.; Haidar, Ayman; Polonskyi, Oleksandr; Faupel, Franz; Abdul‐Khaliq, Hashim; Veith, Michael; Aktas, Oral Cenk

doi:10.1039/c7nr05336c

Cited by 13 publications

(11 citation statements)

References 33 publications

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“…The dependence of WCA on surface morphology at the nanoscale is also under active investigation. [83][84][85] Finally, it was reported that the wettability of the calcite/oil/brine system depends on a variety of factors such as brine concentration 86 and temperature. 87 It has been proposed that ions present in seawater altering the surface charge of calcite is responsible for wettability alteration.…”

Section: Discussionmentioning

confidence: 99%

Water wettability of graphene: interplay between the interfacial water structure and the electronic structure

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Water wettability of graphene: interplay between the interfacial water structure and the electronic structure

et al. 2018

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“…The arrows in Figure b show nanospheres assembled on silanized HNT particles which create rough surfaces, a characteristic critical to enhancing the hydrophobicity. These nanospheres create the needed air gaps that reduce the solid–liquid interaction . The highly irregular shape of Si–HNT particles is helpful in creating surface roughness on the cotton fibers which increases the WCA …”

Section: Resultsmentioning

confidence: 99%

“…These nanospheres create the needed air gaps that reduce the solid-liquid interaction. [37] The highly irregular shape of Si-HNT particles is helpful in creating surface roughness on the cotton fibers which increases the WCA. [38] Figure 3 shows TEM images of Si-HNT particles at different magnifications.…”

Section: Figure 1amentioning

confidence: 99%

“…Figure 1a shows the schematic illustration of the one-step synthesis of Si-HNT particles, and Figure 1b shows the process developed in this study for preparing ultrahydrophobic cotton fabrics. [37] The highly irregular shape of Si-HNT particles is helpful in creating surface roughness on the cotton fibers which increases the WCA. As seen in Figure 2a, pure HNT particles show a smooth surface and tubular structure with diameters less than 100 nm and lengths varying from 500 to 800 nm.…”

Section: Introductionmentioning

confidence: 99%

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Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

Patil

2019

Advanced Sustainable Systems

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This paper presents a sustainable biomimetic approach to create ultrahydrophobic cotton fabrics. Cotton fabrics are modified using biobased raw materials to create multiple scale roughness and low surface energy on their surfaces. Naturally occurring halloysite nanotubes (HNT) are modified by silanization and direct assembly of silica (SiO2) nanospheres on the surface of HNTs. HNTs “decorated” with SiO2 nanospheres are covalently bonded onto the surface of cotton fabrics, creating a durable multiple scale surface roughness. Surface modified cotton fabrics are further grafted with fatty acid without using any solvent, via esterification. The combination of the hierarchical roughness pattern created on the surface through modified HNT, and fatty acid treatment results in ultrahydrophobic fabrics with water contact angles (WCAs) above 150°. Surface topographies of modified HNT particles and chemical changes are fully characterized. Attenuated total reflectance Fourier‐transform infrared and WCA studies are used to confirm the grafting of modified HNT particles and aliphatic fatty chains on surface of fabrics. The ultrahydrophobic cotton fabrics washed for five standard laundry cycles (25 home washings) show that the ultrahydrophobicity is durable. Moreover, the ultrahydrophobic fabrics are oleophilic, making them suitable for use in oil–water separation, anti‐biofouling and packaging, and other applications apart from water repellent clothing.

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“…Determining CAs exceeding 160°–170° (especially when water droplets do not come to rest on a horizontal surface) by using conventional static analysis is not trivial. Recently we presented an alternative approach by recording a videotape during compressing a water droplet attached to a relatively hydrophobic surface with a counter superhydrophobic (to be tested) surface . This method is known as the contact–compress–release technique .…”

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confidence: 99%

Superhydrophobic 3D Porous PTFE/TiO₂ Hybrid Structures

Aktas

Schröder

Veziroglu

et al. 2019

Adv Materials Inter

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or partially removed, superhydrophobicity properties vanish easily. Such 2D surfaces provide a metastable superhydrophobic state since the limited entrapped air in such surfaces disappears quickly in contacting with water and the surface gets completely wetted within a short time. In contrast, 3D structures maintain trapped air at the surface and through whole bulk. [7] These kinds of structures may provide a stable and long-running superhydrophobicity since penetrating water will meet continuously with a fresh trapped-air barrier. It is essential to extend the surface topographies responsible for superhydrophobicity into the bulk by creating both roughness and low surface energy to achieve superhydrophobic 3D materials.Herein, a commercially available polyurethane (PU) foam was utilized as the sacrificial hard template to infiltrate TiO 2 nanoparticles in its interstitial pores. By simply burning out PU template and sintering at 850-900 °C, a 3D TiO 2 skeleton (forming inner and outer macropores) was achieved by 2D assembling of TiO 2 nanoparticles through the whole bulk. By combining macrolevel pores and the micro-/nanostructured topography, a 3D high surface roughness was achieved (Figure 1a; Figure S1, Supporting Information). The prepared TiO 2 slurry was also applied to planar quartz substrates by double-doctor blade coating technique to achieve micro-/nanostructured 2D TiO 2 (Figure 1a; Figure S2, Supporting Information). Afterward, initiated chemical vapor deposition (iCVD) was carried out to coat 2D and 3D TiO 2 homogenously with a thin layer of polytetrafluoroethylene (PTFE) while conserving the inner micro-and nanotopography (as shown schematically in Figure 1b). iCVD allows coating various types of substrates varying from simple 2D to complex 3D structures with a high conformity (without altering topographic details of the pristine structure). [8] After coating a thin layer of PTFE, 3D TiO 2 showed an extraordinary superhydrophobicity.3D TiO 2 has a porous structure with the pore size of ≈100-150 µm (Figure 2a) and exhibits approximately the same micro-and nanoscale structures with 2D TiO 2 surface prepared for the comparison by the well-established doctor blade technique. [9] While 2D surface was composed of micro/nano hierarchical porous texture, 3D surface consists additionally macropores (Figure 2a). Clearly micro-and nanoscale roughness was provided through the whole bulk in 3D TiO 2 . Following the iCVD step, we did not observe any significant change in the morphology of both 2D and 3D TiO 2 . This indicates that the deposited PTFE layer was extremely thin and highly conformal. Figure 2b shows the X-ray photoelectron spectroscopy (XPS) survey spectra of the uncoated and coated 3D TiO 2 . Simply Combining hard-templating and infiltration processes, micro-and nanoscale topography induced by 2D assembling of TiO 2 nanoparticles is extended to 3D TiO 2 . By applying an ultrathin and highly conformal polytetrafluoroethylene (PTFE) layer on prepared 3D TiO 2 via initiated chemical vapor deposition (iC...

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Extreme tuning of wetting on 1D nanostructures: from a superhydrophilic to a perfect hydrophobic surface

Cited by 13 publications

References 33 publications

Water wettability of graphene: interplay between the interfacial water structure and the electronic structure

Water wettability of graphene: interplay between the interfacial water structure and the electronic structure

Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

Superhydrophobic 3D Porous PTFE/TiO₂ Hybrid Structures

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Extreme tuning of wetting on 1D nanostructures: from a superhydrophilic to a perfect hydrophobic surface

Cited by 13 publications

References 33 publications

Water wettability of graphene: interplay between the interfacial water structure and the electronic structure

Water wettability of graphene: interplay between the interfacial water structure and the electronic structure

Direct Assembly of Silica Nanospheres on Halloysite Nanotubes for “Green” Ultrahydrophobic Cotton Fabrics

Superhydrophobic 3D Porous PTFE/TiO2 Hybrid Structures

Contact Info

Product

Resources

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Superhydrophobic 3D Porous PTFE/TiO₂ Hybrid Structures