Year: 2012
Type: dissertation
Abstract: Carbon nanofibers (CNFs) have several properties that make them attractive for electronic devices, filtration membranes, tissue engineering scaffolds, composites (reinforcement agents), or catalyst carriers. Exploitation of renewable resources such as cellulosic materials can help to supply all these expanding demands. \n\nSynthesis of carbon nanofibrous materials with controlled properties by carbonization of electrospun cellulose was performed in the present work. At the first step fine fibers were fabricated by electrospinning of cellulose acetate solution, they were subsequently regenerated to cellulose in various conditions and, finally, carbonized. Scanning electron microscopy (SEM) and x-ray diffraction (XRD) showed that carbonization of electrospun cellulose (EC) at 800 -1000 °C led to the formation of amorphous granular carbon nanofibers with diameters of 20-150 nm, controlled electrical conductivity (3.8 – 17.0 S/cm) and\nwettability (water contact angle is 55 – 120°).\n\nOur analysis shows that the structure and properties of the resulting CNFs are influenced by deacetylation conditions and temperature of carbonization. XRD patterns illustrate different crystallinity indexes (CI) in different cases of\ndeacetylation. Cellulose samples with sufficiently high CI are appropriate precursors for CNF synthesis.
Author: Volodymyr Kuzmenko
Language: English
Subfield: Biomaterials
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1605543908