Design, and Applications Shutao Wang,†,‡ Kesong Liu, Xi Yao, and Lei Jiang*,†,‡,§ †Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, and ‡Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, BeiHang University, Beijing 100191, People’s Republic of China Department of Biomedical Sciences, City University of Hong Kong, Hong Kong P6903, People’s Republic of China

Bioinspired Surfaces with Superwettability: New Insight on Theory, Design, and Applications

Chemical and Physical Pathways for the Preparation of Superoleophobic Surfaces and Related Wetting Theories

Frost formation is a major problem affecting a variety of industries including transportation, power generation, construction, and agriculture. Currently used active chemical, thermal, and mechanical techniques of ice removal are time-consuming and costly. The use of nanotextured coatings infused with perfluorinated oil has recently been proposed as a simple passive antifrosting and anti-icing method. However, we demonstrate that the process of freezing subcooled condensate and frost formation on such lubricant-impregnated surfaces is accompanied by the migration of the lubricant from the wetting ridge and from within the textured substrate to the surface of frozen droplets. For practical applications, this mechanism can comprise the self-healing and frost-repelling characteristics of lubricant impregnated-surfaces, regardless of the underlying substrate’s topography. Thus, further research is necessary to develop liquid-texture pairs that will provide a sustainable frost suppression method.

Mechanism of Frost Formation on Lubricant-Impregnated Surfaces

Corrosion is a subject of interest to interdisciplinary research communities, combining fields of materials science, chemistry, physics, metallurgy and chemical engineering. In order to understand mechanisms of corrosion and the function of corrosion inhibitors, the reactions at the interfaces between the corrosive electrolyte and a steel surface, particularly at the initial stages of the corrosion process, need to be described. Naturally, these reactions are strongly affected by the nature and properties of the steel surfaces. It is however seen that the majority of recent corrosion and corrosion-inhibition investigations are limited to electrochemical testing, with ex situ analysis of the treated steels (post-exposure analysis). The characterization of materials and their surface properties, such as texture and morphology, are not being considered in most studies. Similarly, in situ investigations of the initial stages of the corrosion reactions using advanced surface characterization techniques are scarce. In this review, attention is brought to the importance of surface features of carbon steels, such as texture and surface energy, along with defects dislocation related to mechanical processing of carbon steels. This work is extended to a critical review of surface analytical techniques used for characterization of carbon steels in corrosive media with particular focus on examining steel surfaces treated with corrosion inhibitors. Further, emerging surface analysis techniques and their applicability to analyse carbon steels in corrosive media are discussed. The importance of surface properties is commonly addressed by surface scientists as well as researchers in other chemistry fields such as nanotechnology, fuel cells, and catalysis. This article is expected to appeal to a broad scientific community, including but not limited to corrosion scientists, material chemists, analytical chemists, metal physicists, corrosion and materials engineers.

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Carbon steel corrosion: a review of key surface properties and characterization methods

Superhydrophobic nanocoatings, a combination of nanotechnology and superhydrophobic surfaces, have received extraordinary attention recently, focusing both on novel preparation strategies and on investigations of their unique properties. In the past few decades, inspired by the lotus leaf, the discovery of nano- and micro-hierarchical structures has brought about great change in the superhydrophobic nanocoatings field. In this paper we review the contributions to this field reported in recent literature, mainly including materials, fabrication and applications. In order to facilitate comparison, materials are divided into 3 categories as follows: inorganic materials, organic materials, and inorganic-organic materials. Each kind of materials has itself merits and demerits, as well as fabrication techniques. The process of each technique is illustrated simply through a few classical examples. There is, to some extent, an association between various fabrication techniques, but many are different. So, it is important to choose appropriate preparation strategies, according to conditions and purposes. The peculiar properties of superhydrophobic nanocoatings, such as self-cleaning, anti-bacteria, anti-icing, corrosion resistance and so on, are the most dramatic. Not only do we introduce application examples, but also try to briefly discuss the principle behind the phenomenon. Finally, some challenges and potential promising breakthroughs in this field are also succinctly highlighted.

Superhydrophobic nanocoatings: from materials to fabrications and to applications

Preparation and anti-icing of superhydrophobic PVDF coating on a wind turbine blade

Structural investigation of composite wind turbine blade considering structural collapse in full-scale static tests

Water absorption behavior and mechanical properties of specimens of an epoxy resin casting and the glass fiber reinforced epoxy matrix composites (GFRP) with two fiber volume fractions (Vf) immerse...

Effects of seawater immersion on water absorption and mechanical properties of GFRP composites

A superamphiphobic (super-repellent) surface with both water and rapeseed oil contact angle higher than 150° was prepared on a common cast iron substrate. The water and rapeseed oil contact angles were 158 ± 1.9° and 151 ± 1.7°, respectively. The sliding angles of water and rapeseed oil on the superamphiphobic surface were 2° and 16°, respectively. Scanning electron microscope images showed that many interesting microflower-like microstructures comprised many nanorods with the average diameter of about 200 nm, which were distributed on the superamphiphobic cast iron substrate. Each nanorod was composed of many smaller nanostructures and nano particles, which created interesting micro–nano binary structures similar to the surface microstructures of lotus leaves. When kept in an ambient environment for 6 months, no rust was observed on the superamphiphobic cast iron substrate surface, which showed excellent corrosion resistance.

Jingcheng Zeng

Papers

Preparation and anti-icing of superhydrophobic PVDF coating on a wind turbine blade

Structural investigation of composite wind turbine blade considering structural collapse in full-scale static tests

Effects of seawater immersion on water absorption and mechanical properties of GFRP composites

Preparation of a superamphiphobic surface on a common cast iron substrate

Preparation and characterization of a novel microcapsule-type latent curing agent for epoxy resin