Enhanced Wear Resistance of Transparent Epoxy Composite Coatings with Vertically Aligned Halloysite Nanotubes
| Autor: | Robert E. Cohen, Roberta Polak, Dayong Chen, Kenan Song, Michael F. Rubner, Khalid Askar |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Abrasion (mechanical) Composite number Nanoparticle Nanotechnology 02 engineering and technology Epoxy Surface finish engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Halloysite 0104 chemical sciences Scratch visual_art engineering visual_art.visual_art_medium Particle General Materials Science Composite material 0210 nano-technology computer computer.programming_language |
| Zdroj: | ACS applied materialsinterfaces. 8(51) |
| ISSN: | 1944-8252 |
| Popis: | The influence of nanoparticle orientation on wear resistance of transparent composite coatings has been studied. Using a nozzle spray coating method, halloysite nanotubes (HNTs) were aligned in the in-plane and out-of-plane directions and in various randomly oriented states. Nanoscratching, falling sand, and Taber Abrasion tests were used to characterize the wear resistance at different length scales. Composites consistently displayed better wear resistance than pure epoxy. Samples with out-of-plane particle orientations exhibited better wear-resistant behavior than those with in-plane particle distributions. In nanoscratching tests, the out-of-plane orientation decreases the normalized scratch volume by as much as 60% compared to pure epoxy. In the falling sand and Taber Abrasion tests, out-of-plane aligned halloysite particles resulted in surfaces with smaller roughness based on stylus profilometry and SEM observations. The decrease in roughness values after these wear tests can be as large as 67% from pure epoxy to composites. Composites with higher out-of-plane particle orientation factors exhibited better light transmittance after sand impingements and other wear tests. This study suggests a useful strategy for producing material systems with enhanced mechanical durability and more durable optical properties. |
| Databáze: | OpenAIRE |
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