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This paper reports rapid, continuous and carbon-nanotube free synthesis of carbon encapsulated magnetic nanoparticles by thermal-plasma expansion technique, which combines the typical advantages of high-temperature plasma assisted synthesis method with efficient particle-size control. Core nanocrystals were encapsulated with few layers of graphitized carbon, which could provide protection against...
A model detailing the development of morphology in copolymer PAN (polyacrylonitrile) fibers during oxidative stabilization was recently proposed (Gupta and Harrison, Carbon, 1996, 34, 1427). Some of the main features of this model are: (a) a two-step oxidative stabilization process wherein reactions initiate in the amorphous phase, and progress to the crystalline phase at high temperatures; (b) intramolecular...
Oxidative stabilization studies on PAN-based copolymer fibers indicate the presence of at least two distinct reactions occurring at temperatures below 380°C. Techniques such as thermal stress, percentage shrinkage, differential scanning calorimetry, wide-angle X-ray diffraction and small-angle X-ray scattering have been used to elucidate the mechanisms involved. Reactions initiate in the amorphous...
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