Pillars or Pancakes? Self-Cleaning Surfaces without Coating

Akhtar, Naureen; Thomas, Peter J.; Svardal, Benny; Almenningen, Stian; Jong, Edwin de; Magnussen, Stian; Onck, Patrick; Fernø, Martin A.; Holst, Bodil

doi:10.1021/acs.nanolett.8b02982

Cited by 15 publications

(8 citation statements)

References 27 publications

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“…Wetting, hydrophobicity and ice nucleation are all very widely studied on the macroscopic scale, using routine methods such as contact angle measurements [11][12][13] . However, more precise measurements, with a molecular level of detail, are much scarcer, despite the fact that an understanding could open up opportunities for the design of advanced materials, by exploiting our ability to tune surfaces at the nanoscale 14 . For example, ice nucleation on surfaces is alone of huge technological relevance to fields as diverse as wind power 11,15 , aviation 12,16 and telecommunications 11 .…”

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confidence: 99%

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

et al. 2021

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The interfacial behaviour of water remains a central question to fields as diverse as protein folding, friction and ice formation. While the properties of water at interfaces differ from those in the bulk, major gaps in our knowledge limit our understanding at the molecular level. Information concerning the microscopic motion of water comes mostly from computation and, on an atomic scale, is largely unexplored by experiment. Here, we provide a detailed insight into the behaviour of water monomers on a graphene surface. The motion displays remarkably strong signatures of cooperative behaviour due to repulsive forces between the monomers, enhancing the monomer lifetime ( ≈ 3 s at 125 K) in a free-gas phase that precedes the nucleation of ice islands and, in turn, provides the opportunity for our experiments to be performed. Our results give a molecular perspective on a kinetic barrier to ice nucleation, providing routes to understand and control the processes involved in ice formation.

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confidence: 99%

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

et al. 2021

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“…In recent years, the creation of superhydrophobic coatings for metal surface protection proved to be a good strategy for the improvement of the corrosion resistance while extending the service life of those materials. , A surface is defined as superhydrophobic if it has a water CA above 150° and a sliding angle (SA) below 10°. Due to their particular properties, these surfaces are used for a much larger range of applications, such as self-cleaning, − anticorrosion, − oil–water separation, − anti-icing, − liquid transport, − etc., which attracted the attention of researchers globally. Preparation of such a superhydrophobic surface requires an appropriate combination of surface roughness at micro/nano-scale and a low surface free energy.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic Self-Cleaning Hierarchical Micro-/Nanocomposite Coating with High Corrosion Resistance and Durability

Jin

Hui

Pan

et al. 2021

ACS Sustainable Chem. Eng.

105

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Due to their special wetting properties, bioinspired superhydrophobic coatings are used to protect various materials. However, contamination with corrosive liquids or mechanical damage causes the loss of water repellency of many superhydrophobic surfaces. Therefore, it is imperative to develop chemically stable and durable superhydrophobic coatings. In this work, we report a straightforward method to fabricate a metal–organic framework (ZIF-8)/SiO2 with hierarchical micro-/nanostructures, whose surface hydrophobicity is induced by polydimethylsiloxane (PDMS) modification. Notably, the surface of the resulting ZIF-8@SiO2/PDMS displays superhydrophobicity, together with a water contact angle (CA) of 157°. The superhydrophobic material is chemically stable, the water CA remaining above 150° even after exposure to a wide range of pH values (1–14) for 24 h. The electrochemical results showed that the coating exhibits a high corrosion potential (E corr = −0.321 V) and a very low corrosion current density (i corr = 1.442 × 10–11 A·cm–2) relative to an uncoated aluminum substrate (E corr = −0.711 V, i corr = 6.616 × 10–5 A·cm–2), indicating a high resistance to corrosion as a result of the coating. Also, electrochemical impedance spectroscopy showed that the charge transfer resistance is significantly increased by the coating. These results indicate that the ZIF-8@SiO2/PDMS coating with superhydrophobic properties has excellent corrosion resistance. In addition, the superhydrophobicity was proven for various droplets (i.e., water, tea, milk, coffee), an achievement related to the excellent self-cleaning performance: when the droplets roll off, surface contaminants are easily removed. The coating exhibited good mechanical properties, the CA being above 150° after 100 cycles of scrubbing with a pressure of 20 kPa. These excellent properties recommend the obtained superhydrophobic coating for various practical applications.

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“…This might prove to be excellent UV resistance for ZnO . Many researchers have linked the self-cleaning properties of nanoparticles and architectural conservation in recent years. − These inspirations are critical as they will have a significant impact on the protection of stone in an integrated environment. As an inorganic material with stable chemical properties and the main component of sandstone, the nanoscale SiO 2 has excellent compatibility with the surface of sandstones .…”

Section: Introductionmentioning

confidence: 99%

Nanosized ZnO/SiO₂-Based Amphiphobic Coatings for Stone Heritage Protection

Chai

Wang

Shi

et al. 2022

ACS Appl. Nano Mater.

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Exploring and developing an efficient protective coating for precious stone heritages that have been exposed to sunlight and rain for a long time is crucial. The UV resistance properties of nano-ZnO are apparent. Nano-SiO2 has a stable chemical structure and is one of the main components of stone. This paper introduces the synergistic protective effect of ZnO nanoparticles (ZnO-NPs) and SiO2 nanoparticles (SiO2-NPs) on stone, which is novel in this field. The functional nanocomposite coating (FZS coating) was obtained by spraying the ultrasonic mixture of ZnO-NPs and SiO2-NPs, cross-linked with a silane coupling agent, and modified by fluorocarbon. Wettability and UV aging tests showed that the sandstone deposited by FZS coating had excellent amphiphobicity (water contact angle (WCA) > 160°, oil contact angle (OCA) < 140°). The hydrophobicity was almost changeless after 300 h of UV irradiation, indicating high UV absorption capacity and durability. Interestingly, the amphiphobicity remains unchanged after alternating treatments of temperature and humidity, expressing superior weathering stability. This facile functional coating has potential applications protecting outdoor stone heritages.

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Pillars or Pancakes? Self-Cleaning Surfaces without Coating

Cited by 15 publications

References 27 publications

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Superhydrophobic Self-Cleaning Hierarchical Micro-/Nanocomposite Coating with High Corrosion Resistance and Durability

Nanosized ZnO/SiO₂-Based Amphiphobic Coatings for Stone Heritage Protection

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Pillars or Pancakes? Self-Cleaning Surfaces without Coating

Cited by 15 publications

References 27 publications

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Motion of water monomers reveals a kinetic barrier to ice nucleation on graphene

Superhydrophobic Self-Cleaning Hierarchical Micro-/Nanocomposite Coating with High Corrosion Resistance and Durability

Nanosized ZnO/SiO2-Based Amphiphobic Coatings for Stone Heritage Protection

Contact Info

Product

Resources

About

Nanosized ZnO/SiO₂-Based Amphiphobic Coatings for Stone Heritage Protection