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Preparation of a Stable Superhydrophobic Mortar Surface Using a One-Step Method
Yutong Han1,2, Jue Liu1,2, Xiaojing Xia1,2
1Hunan Province Key Laboratory of Engineering Rheology, Central South University of Forestry and Technology, Changsha 410004, PR China.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 11, 2023
Summary
Researchers developed a durable superhydrophobic coating for concrete using zinc oxide (ZnO), stearic acid, and epoxy resin. This one-step method enhances concrete
Area of Science:
- Materials Science
- Surface Chemistry
- Civil Engineering
Background:
- Cementitious materials like concrete are naturally porous and hydrophilic, leading to damage.
- Existing methods for superhydrophobic surfaces often involve complex preparation and lack stability.
- Developing robust superhydrophobic coatings is crucial for protecting concrete structures.
Purpose of the Study:
- To create a straightforward and effective one-step method for preparing superhydrophobic coatings on mortar surfaces.
- To investigate the microstructure, properties, and stability of the developed superhydrophobic coating.
- To assess the performance of the superhydrophobic coating in terms of water repellency, anti-contamination, and durability.
Main Methods:
- A one-step method was employed using zinc oxide (ZnO) nanoparticles modified with stearic acid and epoxy resin.
- Systematic investigation of the coating's microstructure, physical/chemical properties, hydrophobic characteristics, and stability.
- Evaluation of durability through sandpaper abrasion, tape peeling, and high-temperature resistance tests.
- Molecular dynamics simulation to determine water cluster diffusion coefficients.
Main Results:
- The superhydrophobic coating achieved a maximum water contact angle of 164.2° and a sliding angle of 4.6°.
- Water absorption of the coated mortar decreased by approximately 61% compared to ordinary mortar.
- The coating demonstrated resistance to both particulate and liquid pollutants.
- Excellent physical durability was observed after abrasion, tape peeling, and high-temperature tests.
- Molecular dynamics simulation showed a significantly lower water cluster diffusion coefficient on the modified surface (0.0328 × 10-4 cm2/s) compared to the ordinary coating (0.1645 × 10-4 cm2/s).
Conclusions:
- The one-step preparation method effectively produced a stable and durable superhydrophobic coating on mortar.
- The developed superhydrophobic coating significantly enhances concrete's resistance to water absorption and contamination.
- This advanced coating offers a promising solution for improving the longevity and performance of concrete structures.
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