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

Superhydrophobic coatings have tremendous potential for applications in different fields and have been achieved commonly by increasing nanoscale roughness and lowering surface tension. Limited by the availability of either ideal nano-structural templates or simple fabrication procedures, the search of superhydrophobic coatings that are easy to manufacture and are robust in real-life applications remains challenging for both academia and industry. Herein, we report an unconventional protocol based on a single-step, stoichiometrically controlled reaction of long-chain organosilanes with water, which creates micro- to nano-scale hierarchical siloxane aggregates dispersible in industrial solvents (as the coating mixture). Excellent superhydrophobicity (ultrahigh water contact angle >170° and ultralow sliding angle <1°) has been attained on solid materials of various compositions and dimensions, by simply dipping into or spraying with the coating mixture. It has been demonstrated that these complete waterproof coatings hold excellent properties in terms of cost, scalability, robustness, and particularly the capability of encapsulating other functional materials (e.g. luminescent dyes). Artificial superhydrophobic coatings that are simple to prepare and practical to use are sought after. Here, the authors create versatile, complete-waterproof coatings based on a single-step, stoichiometrically controlled reaction of organosilanes with water.

/pdf/functional-and-versatile-superhydrophobic-coatings-via-20v3fygykw.pdf

Functional and versatile superhydrophobic coatings via stoichiometric silanization.

Development of water-repellent organic–inorganic hybrid sol–gel coatings on aluminum using short chain perfluoro polymer emulsion

A moderate method is first developed here for superfast (in seconds) growth of an ultrafine graphdiyne (GDY) nanochain on arbitrary substrates in the atmosphere. This is an environmentally friendly and metal-catalyst-free method, efficiently eliminating extraneous contaminations for the carbon materials. The seamless GDY coating on any substrates demonstrates that an all-carbon GDY possesses outstanding controllability and processability, perfectly compensating for the drawbacks of prevailing all-carbon materials. After the decoration of 3D GDY nanostructures, the substrates become superhydrophobic with contact angles high up to of 148° and can be used as outstanding frameworks for storing organic pollution. Because of the reasonable porous and 3D continuous features, the as-prepared samples can be applied as high-performance binder-free supercapacitor electrodes with high area capacitance of up to 53.66 mF cm -2, prominent power performance, and robust long-term retention (99% after 1300 cycles).

Ultrafastly Interweaving Graphdiyne Nanochain on Arbitrary Substrates and Its Performance as a Supercapacitor Electrode.

Superhydrophobic surfaces on engineering materials are prepared via a convenient solution-immersion method. The binary geometric structures at the micro- and nanometer scale bestow superhydrophobic properties on the surfaces. The surfaces show stable superhydrophobicity even in many corrosive solutions, such as acidic or basic solutions over a wide pH range, and also in salt solutions. The procedure is time-saving, inexpensive, and fairly facile to carry out. It is expected that this facile technique will accelerate the large-scale production of superhydrophobic engineering materials with new industrial applications.

Fabrication of Superhydrophobic Surfaces on Engineering Materials by a Solution-Immersion Process

6-(N-Allyl-1,1,2,2-tetrahydroperfluorododecyl)amino-1,3,5-triazine-2,4-dithiol monosodium (ATP) was used to prepare polymeric thin films on pure aluminum plates to achieve a superhydrophobic surface. The electrochemical polymerization process of ATP on aluminum plates in NaNO2 aqueous solution and the formation of poly(6-(N-allyl-1,1,2,2-tetrahydroperfluorododecyl)amino-1,3,5-triazine-2,4-dithiol) (PATP) thin film were studied by means of optical ellipsometry and film weight. The chemical structure of the polymeric film is investigated using FT-IR spectra and X-ray photoelectron spectroscopy (XPS). Contact angle goniometry was applied to measure the contact angles with distilled water drops at ambient temperature. The experimental results indicate that the polymeric film formed on pure aluminum plates exhibits superhydrophobic properties with a distilled water contact angle of 153°. The electrochemical polymerization process is time-saving, inexpensive, environmentally friendly and fairly convenient to carry out. It is expected that this technique will advance the production of superhydrophobic materials with new applications on a large scale. Moreover, this kind of polymeric thin film can be used as a dielectric material due to its insulating features.

https://www.mdpi.com/1420-3049/14/11/4737/pdf

Preparation of superhydrophobic polymeric film on aluminum plates by electrochemical polymerization.

Practical adhesion of rubber to aluminum is measured for various aluminum silanization treatments In this study, 6-(3-triethoxysilylpropylamino)-1,3,5-triazine-2,4-dithiol (TES) was used as the coupling agent for preparing self-assembly monolayers (SAMs) on an aluminum surface The structure and chemical composition of the SAMs were analyzed using Fourier transform infra-red spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) The changes in the surface features of the aluminum surface due to TES treatment were investigated by atomic force microscopy (AFM) The adhesive properties of the silanized aluminum surface and EPDM rubber have been evaluated by a T-peel strength test The results suggested that the Si-O-Al bonding at aluminum TES interface existed and a TES self-assembly monolayer was formed on the aluminum surface More than 60 KN/m adhesion strength is obtained when the aluminum is silanized with 25 mmol/dm(3) TES, cured at 160 degrees C and vulcanized with EPDM rubber at 160 degrees C for 30 min It is suggested that the TES self-assembly monolayer is bound to aluminum through its ethoxysilyl functional group, and the thiol function group is strongly crosslinked to EPDM rubber, respectively

https://www.mdpi.com/1420-3049/14/10/4087/pdf

A new organofunctional ethoxysilane self-assembly monolayer for promoting adhesion of rubber to aluminum.

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Preparation of superhydrophobic polymeric film on aluminum plates by electrochemical polymerization.

A new organofunctional ethoxysilane self-assembly monolayer for promoting adhesion of rubber to aluminum.