Hao Wang,Yinjie Wang,Tianyu Li,Chuang Yu,Peng Lin,Jiping Liu,Yuxuan Lan,Ye-Tang Pan
Flexible polyurethane foams are widely used in building and vehicle interiors due to their lightweight and high resilience. However, most foams are non-biodegradable or fireproof, leading to serious white foam pollution and safety problems. Here, FPUF made of a porous MOF material loaded with flame retardant elements as a coating is reported, which realizes fire protection, isolation of heat and noise, and recovery of foam. The results show that FPUF-3 exhibited excellent fire and smoke suppression effects, and PHRR, CO production, and CO 2 production are reduced by 28.5%, 54.5%, and 21.4%, respectively. The FPUF-3 shows a longer heat preservation effect and can reduce the common noise decibel by >35%. In addition, the coating exhibits excellent stability under extreme acid–base conditions and has longer durability and effectiveness under alkaline conditions. Furthermore, the separation and recovery of FPUF and coating can be realized by ethanol solvent, and the recovery rate of coating can reach >80%, the foam still has the original high elasticity and lightweight characteristics. It provides a sustainable and practical solution for effectively improving the noise reduction, fire prevention, and heat insulation capabilities of FPUF.
Muscle tissue performs crucial contraction/extension motions that generate mechanical force and work by consuming chemical energy. Inspired by this naturally created biomolecular machine, artificial molecular muscles are designed and synthesized to undertake linear actuation functions. However, most of these muscle-like actuators are performed at large ensembles, while to realize the nanoscale actuation at the single- to few-molecule level remains challenging. Herein, we developed an artificial muscle-like molecular actuator that can reversibly control the proximity of the attached nano-objects, gold nanoparticles, within the single-molecule length level by its stimuli-responsive muscle-like linear contraction/extension motion. The molecular actuation motion is accompanied by an optical signal output resulting from the plasmonic resonance properties of gold nanoparticles. Meanwhile, the thermal noise of the muscle-like molecular actuator can be overcome by integrating the optical signal over a sufficiently long period.
危险品化学品经营许可证（带存储）