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"ACS Nano" Zhang Xuitong of Suna Institute of Chinese Academy of Sciences: Bending Stiffness-oriented Manufacturing of Kevlar Aerogel Organic Phase Change Fibers
Release time:
2021-08-27 16:40
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Smart and functional fibers show great potential in a wide range of applications including wearable devices and other high-tech fields, but designing and manufacturing smart fibers with manageable structures and multifunctional functions is still a huge challenge. recently, Research Team of Suzhou Institute of Nanotechnology and Nano-bionics, Chinese Academy of Sciences An ingenious bending stiffness guiding strategy was developed to manufacture smart phase-change fibers with different bending stiffnesses suitable for various applications. Specifically, hydrophobic Kevlar aerogel fibers (H-KAFs) is a porous body and paraffin wax is a functional object. Hydrophobic Kevlar aerogels occluded paraffin fibers (PW@H-KAF), whereH-KAFBy applying a two-step method using a special coagulation bath containing a mixture of ethanol and n-bromobutane onKevlarnanofiber(KNF)Functionalization is performed. PreparedPW@H-KAFswith high latent heat (135.1-172 J/g), excellent thermal cycle stability and satisfactory mechanical properties (tensile strength is30 MPaand the tensile strain is30%）。
In addition, even in paraffin solid state, with bending stiffnessPW@H-KAFsAlso below the critical value (1.22 × 10-9 N · m 2), showing high flexibility, cleanability and high heat management capabilities, indicating the great potential of smart temperature regulating fabrics.PW@H-KAFsThe bending stiffness of is higher than the critical stiffness of solid paraffin and can be used as a shape memory material, which is attributed to the transition between rigidity and flexibility caused by phase transformation. As a proof of concept, based onPW@H-KAF(Diameter400 μm) designed a dynamic The state gripper is used to transport items by grasping in a rigid state and releasing in a flexible state. This work is achieved by the bending stiffness-oriented approachPW@H-KAFsmulti-functional applications, provides ideas for the application of phase change composite materials.
Figure1.Schematic diagram of Kevlar fiber manufacturing and application according to bending stiffness
Figure4.with large diameter and high bending stiffnessPW@H-KAFcharacteristics and performance.
Aerogel, Hydrophobic aerogel, Aerogel fiber, Hydrophobic Kevlar aerogel occluded paraffin fiber
