Special Issue "Wetting of Nanostructured Materials"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: 30 October 2018

Special Issue Editor

Guest Editor
Dr. Rafael J. Taboryski

Department of Nanotechnology, Technical University of Denmark, Ørsteds Plads, Bygning 345C, 2800 Kgs. Lyngby, Denmark
Website | E-Mail
Interests: micro and nanofabrication techniques of polymers; Si and glass; microfluidics; electrophysiology; surface wetting phenomena; electrochemical biosensors; sensitive electrical measurement techniques

Special Issue Information

Dear Colleagues,

Controlling the wetting properties of solid surfaces is important in many aspects of engineering solutions for healthcare, water harvesting, energy conversion, and industrial painting, just to mention some key applications. As scientists, we can contribute by providing a deeper understanding of the wetting phenomena and demonstrate the solutions. For inspiration, we can look at the solutions already developed by nature through millions of years of evolution. Many of those biomimetic designs comprise surface textures on the nano-scale. How do we engineer solid surfaces by nanostructures and surface chemistry to enable properties such as self-cleaning, omni-phobicity, anti-icing, anti-fogging, drag reduction, anti-fouling, and lubrication to address the societal needs, and why does it work? We would very much like to consider your proposed answer in the form of a scientific paper to these questions in this Special Issue of Nanomaterials.

Dr. Rafael J. Taboryski
Guest Editor

Manuscript Submission Information

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Keywords

  • self-cleaning
  • anti-fogging
  • anti-icing
  • drag-reduction
  • lubrication
  • anti-fouling
  • oleophobic
  • omni-phobic
  • super-wetting
  • hemiwicking

Published Papers (4 papers)

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Research

Open AccessArticle Effect of Structure Hierarchy for Superhydrophobic Polymer Surfaces Studied by Droplet Evaporation
Nanomaterials 2018, 8(10), 831; https://doi.org/10.3390/nano8100831
Received: 1 October 2018 / Revised: 5 October 2018 / Accepted: 10 October 2018 / Published: 13 October 2018
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Abstract
Super-hydrophobic natural surfaces usually have multiple levels of structure hierarchy. Here, we report on the effect of surface structure hierarchy for droplet evaporation. The two-level hierarchical structures studied comprise micro-pillars superimposed with nanograss. The surface design is fully scalable as structures used in
[...] Read more.
Super-hydrophobic natural surfaces usually have multiple levels of structure hierarchy. Here, we report on the effect of surface structure hierarchy for droplet evaporation. The two-level hierarchical structures studied comprise micro-pillars superimposed with nanograss. The surface design is fully scalable as structures used in this study are replicated in polypropylene by a fast roll-to-roll extrusion coating method, which allows effective thermoforming of the surface structures on flexible substrates. As one of the main results, we show that the hierarchical structures can withstand pinning of sessile droplets and remain super-hydrophobic for a longer time than their non-hierarchical counterparts. The effect is documented by recording the water contact angles of sessile droplets during their evaporation from the surfaces. The surface morphology is mapped by atomic force microscopy (AFM) and used together with the theory of Miwa et al. to estimate the degree of water impregnation into the surface structures. Finally, the different behavior during the droplet evaporation is discussed in the light of the obtained water impregnation levels. Full article
(This article belongs to the Special Issue Wetting of Nanostructured Materials)
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Open AccessFeature PaperArticle Resistance of Superhydrophobic Surface-Functionalized TiO2 Nanotubes to Corrosion and Intense Cavitation
Nanomaterials 2018, 8(10), 783; https://doi.org/10.3390/nano8100783
Received: 25 August 2018 / Revised: 25 September 2018 / Accepted: 27 September 2018 / Published: 2 October 2018
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Abstract
The availability of robust superhydrophobic materials with the ability to withstand harsh environments are in high demand for many applications. In this study, we have presented a simple method to fabricate superhydrophobic materials from TiO2 nanotube arrays (TNTAs) and investigated the resilience
[...] Read more.
The availability of robust superhydrophobic materials with the ability to withstand harsh environments are in high demand for many applications. In this study, we have presented a simple method to fabricate superhydrophobic materials from TiO2 nanotube arrays (TNTAs) and investigated the resilience of the materials when they are subjected to harsh conditions such as intense cavitation upon ultrasonication, corrosion in saline water, water-jet impact, and abrasion. The TNTAs were prepared by anodization of Ti foil in buffered aqueous electrolyte containing fluoride ions. The hydrophilic TNTAs were functionalized with octadecylphosphonic acid (ODPA) or 1H, 1H′, 2H, 2H′-perfluorodecyl phosphonic acid (PFDPA) to form a self-assembled monolayer on the TNTA surface to produce superhydrophobic ODPA@TNTA or PFDPA@TNTA surfaces. The superhydrophobic ODPA@TNTA and PFDPA@TNTA have contact angles of 156.0° ± 1.5° and 168° ± 1.5°, and contact angle hysteresis of 3.0° and 0.8°, respectively. The superhydrophobic ODPA@TNTA and PFDPA@TNTA were subjected to ultrasonication, corrosion in saline water, and water-jet impact and abrasion, and the resilience of the systems was characterized by electrochemical impedance spectroscopy (EIS), contact angle (CA) measurements, diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), and field-emission scanning electron microscopy (FESEM). The results presented here show that superhydrophobic ODPA@TNTA and PFDPA@TNTA are robust and resilient under the harsh conditions studied in this work, and indicate the potential of these materials to be deployed in practical applications. Full article
(This article belongs to the Special Issue Wetting of Nanostructured Materials)
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Graphical abstract

Open AccessArticle Controlling the Wetting Properties of Superhydrophobic Titanium Surface Fabricated by UV Nanosecond-Pulsed Laser and Heat Treatment
Nanomaterials 2018, 8(10), 766; https://doi.org/10.3390/nano8100766
Received: 13 September 2018 / Revised: 19 September 2018 / Accepted: 21 September 2018 / Published: 27 September 2018
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Abstract
In this study, the effects of nanosecond-pulsed laser and pattern design were researched on the wettability of titanium material. Nanosecond-pulsed laser and heat treatment are used to fabricate superhydrophobic titanium surfaces. The effects of laser power (1–3 W) and step size (50–300 µm)
[...] Read more.
In this study, the effects of nanosecond-pulsed laser and pattern design were researched on the wettability of titanium material. Nanosecond-pulsed laser and heat treatment are used to fabricate superhydrophobic titanium surfaces. The effects of laser power (1–3 W) and step size (50–300 µm) on a microscale patterned titanium surface (line pattern and grid pattern) were investigated to explain the relation between microstructure and superhydrophobicity. The surface morphologies and wettability of the surfaces were analyzed by three-dimensional confocal microscopy and a contact angle meter. The results show that the laser power and pattern design affected the apparent contact angle (CA) and sliding angle (SA). The maximum step size, which could show superhydrophobicity with apparent CA > 150° and SA < 10°, was increased when the laser power increased from 1 to 3 W. Grid pattern showed isotropic wetting behavior, but line pattern showed both isotropic and anisotropic wetting behavior according to step size and laser power. Furthermore, when choosing the proper laser power and step size, the wetting properties of superhydrophobic surface such as lotus effect (apparent CA > 150° and SA < 10°) and petal effect (apparent CA > 150° and no SA) and isotropic/anisotropic behavior can be controlled for applications of water droplet control. Full article
(This article belongs to the Special Issue Wetting of Nanostructured Materials)
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Graphical abstract

Open AccessArticle Wetting Behaviors of a Nano-Droplet on a Rough Solid Substrate under Perpendicular Electric Field
Nanomaterials 2018, 8(5), 340; https://doi.org/10.3390/nano8050340
Received: 27 April 2018 / Revised: 14 May 2018 / Accepted: 15 May 2018 / Published: 17 May 2018
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Abstract
Molecular dynamic simulations were adopted to study the wetting properties of nanoscale droplets on rough silicon solid substrate subject to perpendicular electric fields. The effect of roughness factor and electric field strength on the static and dynamic wetting behaviors of a nano-droplet on
[...] Read more.
Molecular dynamic simulations were adopted to study the wetting properties of nanoscale droplets on rough silicon solid substrate subject to perpendicular electric fields. The effect of roughness factor and electric field strength on the static and dynamic wetting behaviors of a nano-droplet on a solid surface was investigated at the molecular level. Results show that the static contact angle tends to decrease slightly and show small difference with the increase of roughness factor, while it shows an obvious increase for the ramp-shaped surface because the appearing bottom space reduces the wettability of solid surface. Additionally, under the electric field, a nano-droplet was elongated in the field direction and the equilibrium contact angle increases with the increase of electric field strength. The nano-droplet was completely stretched to be column-shaped at a threshold value of the field. Besides, accompanied by the shape variation of water droplets, the molecular dipole orientations of water molecules experience a remarkable change from a random disordered distribution to an ordered profile because of the realignment of water molecules induced by electric fields. Full article
(This article belongs to the Special Issue Wetting of Nanostructured Materials)
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