The world of 3D printing is constantly evolving, and researchers at Jiangnan University and Jiangda Vibration Isolator Co., Ltd. have made a groundbreaking discovery that could revolutionize the field. They've developed a 3D-printed silicone rubber lattice that not only resists fungal growth but also excels at vibration isolation and cushioning in marine environments. This innovative material addresses a critical trade-off in the industry: antifungal coatings can wear off, while high filler loadings can reduce flexibility, a crucial factor for cushioning applications.
The key to this success lies in the use of additive manufacturing, which allows for precise control over both composition and internal geometry. By formulating a composite ink with silicone rubber and hexagonal boron nitride (hBN), the team created a material with remarkable properties. Optical microscopy and micro-CT imaging revealed a well-ordered structure with stable interlayer bonding, ensuring the lattice's integrity. However, the processing window was crucial; inks with more than 5 wt% hBN became too viscous for reliable extrusion, limiting the workable composition range to 1-5 wt%.
Antifungal testing showcased the material's prowess. Lattice structures without hBN exhibited visible colonization after 28 days, while those with 5 wt% hBN showed no observable fungal growth. The geometry played a role, too; larger filament spacing increased fungal coverage, especially at lower filler loadings. This finding highlights the importance of design in achieving antifungal performance.
The antifungal mechanism is twofold. Firstly, hBN increased surface hydrophobicity, making the material more water-repellent and reducing fungal spore penetration. Secondly, microscopy data revealed biochemical and physical damage at the fungus-material interface, with reactive oxygen species and disrupted hyphal surfaces observed. This dual approach, combining hydrophobicity and oxidative stress, contributes to the material's antifungal effectiveness.
Mechanical testing demonstrated the lattice's cushioning capabilities. The material exhibited an elastic region, a stress plateau, and a final stage of rapid stress increase, attributed to elastic buckling in the lattice cells. Finite element simulations and in situ observations supported this mechanism, and durability testing showed remarkable resilience under repeated loading.
Vibration tests further extended the material's capabilities. The lattice shifted the isolation frequency, widening the effective vibration-isolation range. Random vibration tests produced impressive results, with isolation efficiencies above 80% in multiple directions. Even after fungal exposure, the vibration-isolation performance remained largely unchanged.
This research presents a unique 3D-printed elastomer lattice that seamlessly combines antifungal protection and mechanical performance. By integrating antifungal and cushioning properties into a single structure, the study opens up new possibilities for shipborne equipment and other systems exposed to harsh conditions. The authors, including Zhenyu Wang and Xinyu Song, have made a significant contribution to the field of additive manufacturing, showcasing its potential to address complex material trade-offs.
As the 3D printing industry continues to evolve, events like the 2026 Additive Manufacturing Applications series will play a crucial role in showcasing real-world applications. The field is ripe with opportunities, and researchers like those at Jiangnan University and Jiangda Vibration Isolator Co., Ltd. are paving the way for exciting advancements in 3D printing technology.
