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Hollow / porous carbon spheres derived from biopolymers

Abstract : In the present work, we proposed for the first time to synthesize hollow / porous carbon spheres by hydrothermal treatment and subsequent pyrolysis of templates, either natural such as fish eggs or alginate beads, or synthetic such as polymer capsules filled with xylitol-erythritol blend. Sucrose, tannin, resorcinol-formaldehyde, etc., were used as carbon precursors. The influence of the reaction conditions during the hydrothermal treatment or the pyrolysis was investigated in order to find the optimal reaction conditions and to tune the diameter and the porosity of the resultant materials. The microwave-absorbing properties of a heterostructure consisting of an ordered monolayer of hollow or porous glassy carbon spheres packed in 2D were experimentally and theoretically investigated in the Ka-band (26–37 GHz) frequency range. The first test of the hollow carbon spheres used for concentrating the solar energy and thus improving solar thermal evaporation was also carried out in this thesis
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Submitted on : Monday, April 9, 2018 - 2:47:45 PM
Last modification on : Friday, January 7, 2022 - 3:42:59 AM

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  • HAL Id : tel-01761902, version 1



Sijin Li. Hollow / porous carbon spheres derived from biopolymers. Chemical Sciences. Université de Lorraine, 2017. English. ⟨NNT : 2017LORR0121⟩. ⟨tel-01761902⟩



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