Langmuir最新文献

Superhydrophobic coatings show promising potential for applications in petroleum pipeline anticorrosion due to their exceptional water repellency. A core bottleneck in the development of superhydrophobic coatings is their limited mechanical and corrosion durability, which is closely linked to microstructural fragility. Inspired by the protective mechanism of leaf mineralization, a superhydrophobic coating is developed via a simple low-temperature spraying method to reduce wear and corrosion in pipelines. A micro-nano structure is obtained by the synergistic effect of polydopamine (PDA)-linked ZrO₂ nanoparticles and carbon nanotubes (CNTs) (ZrO₂/CNTs@PDA). The CNTs imitate cellulose nanofibers to create a three-dimensional (3D) porous network. The ZrO₂ nanoparticles simulate plant-based mineralized materials in both the internal holes of the network and the surfaces of the carbon nanotubes, thereby enhancing the mechanical strength and corrosion resistance of the ZrO₂/CNTs@PDA coating. The ZrO₂/CNTs@PDA coating exhibits a high water contact angle (WCA) of 165.6°, a small sliding angle (SA) of 6°, and an oil contact angle of 138.8°, demonstrating excellent superhydrophobicity and oleophobicity. The ZrO₂/CNTs@PDA hydrophobic coating shifts the corrosion potential of X80 steel from -0.643 to +0.305 V and has a 7 orders of magnitude decrease in corrosion current density. The coating's corrosion resistance showed no significant change after being immersed in 3.5 wt % NaCl solution for 21 days, confirming its excellent durability. Even after 1500 cm of abrasion, the coating retained a WCA above 150°, demonstrating its remarkable wear resistance. The coating exhibits excellent self-cleaning and antifouling performance, effectively repelling the accumulation of various substances such as sand, methylene blue, oil, and milk. It is worth emphasizing that the ZrO₂/CNTs@PDA hydrophobic coating can be produced efficiently on a large scale while also demonstrating effective corrosion resistance, self-cleaning, and antifouling properties even under harsh operating conditions.

Through dual encapsulation of the insecticide lufenuron with β-cyclodextrin octadecanoate and urea-formaldehyde resin, a lufenuron@β-cyclodextrin octadecanoate/urea formaldehyde resin (LF@β-CDs/UF) nanoformulation was prepared. This dual-carrier synergy significantly prolonged the release cycle of lufenuron and enhanced environmental adaptability. Results demonstrated that under 25 °C and pH 7 conditions, its release cycle reached 324 h in 20% methanol-water, representing a 1.5-fold prolongation compared to the single-carrier lufenuron@β-cyclodextrin octadecanoate (LF@β-CDs) nanoformulation, with a pH/temperature-responsive release behavior. The photolysis half-life (t₅₀) was extended by 1.6- and 9.3-fold compared to LF@β-CDs (51 h) and lufenuron (LF) microemulsion (8.9 h), respectively. At a low concentration of 6.25 mg/L, the mortality rate against Spodoptera litura reached 73.33%, significantly outperforming LF@β-CDs (29.33%) and LF microemulsion (5.33%). The LF@β-CDs/UF also substantially prolonged insecticidal duration and enhanced the systemic translocation of lufenuron in plants. Biosafety assessment showed that it significantly reduced ecological toxicity, increasing rice seed germination rates from 40.7% (microemulsion) to 71.3% at 400 mg/L seed-soaking concentration, while elevating the acute toxicity LC₅₀ value in zebrafish by 4.4-fold, demonstrating substantially comparative eco-friendliness compared to conventional formulations. This dual-carrier technology, via structure-function synergy, provides an innovative solution to challenges such as low pesticide utilization efficiency and high environmental risks.