Preparation of polyacrylonitrile- based porous hollow carbon microspheres

Abstract

Hollow carbon microspheres were successfully fabricated in a convenient fashion by employing polyacrylonitrile (PAN) emulsions as precursors. The obtained hollow carbon microspheres were shown high monodispersity, tunable pore structures-gradient pore diameters and uniform orientation of pores. Through varying the flowing rates of three phases and solidification time, the PAN microspheres with different sizes and densities could be simply synthesized. Besides the relationship between the solidification time and the density of microspheres as well as their gas barrier properties were studied in this paper. These structured microspheres have great potential applications in various areas, including foam targets, carbon molecular sieve, cargo storage, medical instruments and so on.

Improved rate performance of nanoscale cross-linked polyacrylonitrile-surface-modified LiNi0.8Co0.1Mn0.1O2 lithium-ion cathode material with ion and electron transmission channels

“…Among them, polyacrylonitrile (PAN) with high mechanical strength, chemical stability and corrosion resistance can be used as the precursor for carbon fibers. 25 The presence of CuN in its molecular structure provides certain flexibility. 26,27 PAN is susceptible to dehydrogenation and cyclization after heat treatment and forms a conjugated derivative with a cyclized structure, namely crosslinked polyacrylonitrile (cPAN).…”

Microwave-Mediated Stabilization and Carbonization of Polyacrylonitrile/Super-P Composite: Carbon Anodes with High Nitrogen Content for Lithium Ion Batteries

“…Polyacrylonitrile (PAN) is a widely used polymeric precursor for fabricating carbonaceous materials. ,, For most polymeric carbon precursors to become carbonaceous materials, including PAN, two-step heat treatment procedures are followed. ,, The first heat treatment is a pretreatment before the high-temperature carbonization process, which is called the stabilization process. During the stabilization process, heat treatment is applied to polymeric precursors in an atmospheric environment at a temperature ranging from 200–400 °C.…”

Helical structure of linear homopolymers

“…Because is hard, relatively insoluble, and a highmelting material [38], PAN is used to develop carbon fibers by stabilization, carbonization, and graphitization under controlled conditions [39,40]. PAN is also used in development of nanofibers [41,42], microcapsules/microspheres with diverse application (such as foam targets, carbon molecular sieve, cargo storage, or medical instruments) [43], semiconductor PAN powder (10 -10 S/cm < conductivity < 10 -3 S/cm when treated at 285-300°C) [44], or in the treatment of metals [45].…”