One-step laser etching of a bionic hierarchical structure on a silicone rubber surface with thermal and acid/alkali resistance and tunable wettability

Efficient fabrication of hunting trap-inspired degradable film with enhancing antimicrobial activity and reducing fomite transmission

The extensive application of medical protective polymers has significantly contributed to preserving human lives and well-being. Due to the widespread use of protective polymer materials and their non-degradable nature, environmental and biological pollution issues are becoming increasingly severe. To address the environmental pollution problems caused by traditional polymer materials, this study proposes an efficient and successive method for the mass production of polylactic acid/graphene oxide (MNPG) films with the hunting trap-inspired pyramidal micro/nanostructure by combining micro-extrusion compression molding and electrostatic flocking. The hunting trap-inspired pyramidal micro/nanostructure enhances liquid repellency and antibacterial performance, effectively reducing contaminant adhesion. The MNPG film exhibits an impressive antibacterial efficacy, inhibiting bacterial growth by up to 98.1 %, demonstrating excellent repellency against common liquids, such as blood, bovine serum albumin, milk, and tea, leaving no detectable residue. This provides initial protection against bacterial adhesion and dissemination as well as the spread of pollutants. Importantly, the film retains only 30 wt% of its original mass after 14 days in degradation experiments, indicating favorable biodegradability. This method offers a novel approach for designing sustainable protective materials and holds potential to replace traditional non-degradable polymers.

Biomimetic superhydrophobic metal/nonmetal surface manufactured by etching methods: A mini review

As an emerging fringe science, bionics integrates the understanding of nature, imitation of nature, and surpassing nature in one aspect, and it organically combines the synergistic complementarity of function and structure-function integrated materials which is of great scientific interest. By imitating the microstructure of a natural biological surface, the bionic superhydrophobic surface prepared by human beings has the properties of self-cleaning, anti-icing, water collection, anti-corrosion and oil-water separation, and the preparation research methods are increasing. The preparation methods of superhydrophobic surface include vapor deposition, etching modification, sol-gel, template, electrostatic spinning, and electrostatic spraying, which can be applied to fields such as medical care, military industry, ship industry, and textile. The etching modification method can directly modify the substrate, so there is no need to worry about the adhesion between the coating and the substrate. The most obvious advantage of this method is that the obtained superhydrophobic surface is integrated with the substrate and has good stability and corrosion resistance. In this article, the different preparation methods of bionic superhydrophobic materials were summarized, especially the etching modification methods, we discussed the detailed classification, advantages, and disadvantages of these methods, and the future development direction of the field was prospected.