MULTIWALLED CARBON NANOTUBE/CHITOSAN BASED AEROGELS
Keywords:
aerogel, carbonization, carbon nanotubes, chitosan, freeze-dryingAbstract
This paper is devoted to synthesis and investigation of aerogels based on carbon nanomaterials. Graphene and other carbon nanomaterials based aerogels represent a class of ultra-light materials in which the liquid phase is completely substituted by gaseous. The methodology of synthesis of these aerogels mostly consists of three main parts: synthesis – creation of aqueous dispersions of carbon nanomaterials with its subsequent reduction, freeze-drying of the samples and thermal heating of aerogels in inert atmosphere. Aerogels were synthesized by homogenization of carbon nanotubes and chitosan under ultrasonic treatment and active stirring, followed by freeze-drying in order to remove the liquid from its structure. Freezedrying was carried out at temperature of - 5 °C and pressure of 30-80 Pa. After freeze-drying which lasted for 20 hours, the as-obtained aerogels were carbonized at temperature of 800 °C in an inert atmosphere. Surface morphology of resulting aerogels was studied using scanning electron microscopy. The hydrophobicity and sorption capacity to organic liquids that are characterized by different densities were investigated.
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