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The structure of carbon nanofiber (CNF) with platelet texture was found to be constructed by a primary structural unit named carbon nano-rod by the authors through comprehensive examination of X-ray diffraction (XRD), high-resolution scanning electron microscopy (HR-SEM), high-resolution transmission electron microscopy (HR-TEM), and scanning tunneling microscopy (STM). Single carbon nano-rod resembles...
The solid-phase annealing of the mesophase pitch spun fiber was examined between the glass transition (T g ) and softening (T s ) temperatures of the pitch to improve the graphitization degree of the graphitized fiber through recovering or further improving the stacking height of the mesogen molecules in the spun fiber, since the rapid spinning reduced markedly stacking height in the...
Mesophase pitch has been synthesized from pure aromatic hydrocarbons (naphthalene, methylnaphthalene) aided by an HF–BF 3 catalyst. These synthesized pitches have better performance for many applications — carbon fibers, binders, and anode materials for lithium ion batteries etc. — because the purity and high aromaticity leads to high orientation. This paper discusses the kinds of pitch, the...
Development of mesoscopic texture in the longitudinal surface of mesophase pitch-based carbon fibers through heat treatment was characterized in as-spun, stabilized, carbonized and graphitized fibers using a high resolution scanning electron microscope (HR-SEM). The basic structural units on the longitudinal surface of the mesophase pitch-based graphitized fibers defined as the pleat and fibril were...
Mesocarbon microbeads (MCMB) prepared from a synthetic naphthalene isotropic pitch with or without carbon black were compared in their microstructure observed under high resolution scanning electron microscopy and transmission electron microscopy (TEM). The spheres prepared without carbon black exhibited an assemble of microdomain units with a number of voids among the units after isolation by pyridine...
Co-oligomerized mesophase pitch from naphthalene and methylnaphthalene at mixing ratio of 7:3 by aid of HFBF 3 was studied in terms of its structure, flow behavior and stabilization reactivity as well as microstructure and mechanical properties of the resultant fiber. The molecular structure of co-oligomerized mesophase pitch was rather similar to that of naphthalene pitch because of major...
The mesoscopic textures of the mesophase pitch and its spun fiber were examined in the as-prepared and solvent extracted forms using high resolution scanning electron microscopy (HR-SEM). HR-SEM revealed spherical or elliptical grains of 10-50 nm size. Such units were defined as microdomains in the insoluble fraction of the mesophase pitch. The solvent of high dissolving activity reduced the size...
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