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Carbon aerogels prepared by autocondensation of flavonoid tannin

Carbon Resources Conversion 2019年第1期2卷 72-84页

作者： A.Szczurek V.Fierro G.Medjahdi a.celzard Universitede Lorraine CNRSIJLF-88000 EpinalFrance LTNFM Centre of New TechnologiesUniversity of WarsawBanacha 2c02097 WarsawPoland Universitéde Lorraine CNRSIJLF-54000 NancyFrance

The first carbon aerogels prepared by autocondensation of condensed(flavonoid)tannin,a cheap renewable resource extracted from Mimosa barks,are *** aqueous solutions of tannin and sodium silicate indeed produced the very fast gelation of tannins,thus leading to organic hydrogels which were first converted into organic aerogels by supercritical drying,and then into carbon aerogels after pyrolysis at 900℃.Subsequent dissolution of the silica nanoparticles thus formed within the carbon structure further increased significantly the porosity of the *** thus appeared to be both the gelation catalyst and a pore-directing *** this work,the influence on the porosity of the silica/tannin ratio and of the nature of the etching agent used for removing the silica was thoroughly investigated by combining several *** conditions for producing either the most porous materials or those with the highest surface areas were identified and discussed.

关键词： Condensed tannins Autocondensation reactions Mesoporous carbons Carbon aerogels

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Development of a Carbon Felt/Salt-Based Hybrid Material for Thermal Energy Storage Applications

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Journal of Energy and Power Engineering 2018年第7期12卷 356-364页

作者： Fouzia Achchaq E.Risueno I.Mahroug P.Legros Eric Lebraud B.Karakashov Elena Palomo del Barrio a.celzard V.Fierro Jean Toutain Bordeaux University I2M UMR CNRS 5295Esplanade des Arts et MétiersTalence 33 405France PLACAMAT 87 Avenue du Docteur SchweitzerPessac Cedex 33608France ICMCB 87 Avenue du Docteur SchweitzerPessac 33608France UMR Universitéde Lorraine-CNRS 7198 IJL27 rue Philippe SéguinBP 21042épinalFrance CICenergiGUNE Parque Tecnológico deálavaAlbert Einstein48Vitoria-Gasteiz 01510Espagne INP Bordeaux I2M UMR CNRS 529516 avenue Pey-BerlandPessac 33607France

A LiBr/LiOH non-eutectic mixture shows a potentially outstanding heat energy density of 800 J/g at a constant temperature,which makes it a very promising candidate for heat storage applications around 300℃.However,salt-based phase change materials are known for their too low thermal conductivity which can question the thermal storage systems effective *** objective here is to infiltrate a carbon felt of high porosity(>93%)with the LiBr/LiOH mixture to anticipate this *** device has to be adapted according to the properties and the characteristics of the studied storage and host *** developed procedure for the carbon felt infiltration with the synthesized binary system is *** optimised working conditions allow(1)minimizing the interaction time duration between the quartz tube and the salt-based mixture and,(2)verifying the good chemical compatibility of the mixture with the host matrix after infiltration.

关键词： Liquid infiltration carbon felt LiBr/LiOH-based mixture chemical compatibility

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