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LGP2, a center of innovative research

3D printed conductive cellulosic structure

Published on October 10, 2017
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PhD Defense September 29, 2017

Ying SHAO, Ph.D. student of LGP2, defended her Ph.D. thesis: "Use of lignocellulosic materials and 3D printing for the elaboration of conductive carbon strutures".

PAG-car_these4.jpg

PAG-car_these4.jpg

This University Grenoble Alpes doctoral thesis was prepared under the supervision of Davide BENEVENTI, CNRS Research Director, of Professor Didier CHAUSSY (Grenoble INP-Pagora / LGP2) and the co-supervision of Philippe GROSSEAU, Research Director (École des Mines, Saint-Étienne).

In this thesis, electrically conductive and mechanically resistant carbon structures were elaborated by 3D printing and subsequent pyrolysis using microfibrillated cellulose, lignosulfonate and cellulose powder (MFC/LS/CP) blends.

The processability of MFC/LS/CP slurries by 3D printing was examined by rheological tests in both steady flow and thixotropic modes. The printed MFC/LS/CP pastes were selfstanding, provided a high printing definition and were proved to be morphologically stable to air drying and the subsequent pyrolysis.

Pyrolysis at a slow rate (0.2°C/min) to a final temperature in the range of 400-1200°C was used to manufacture MFC/LS/CP carbons. The TGA/DTG was applied to monitor the thermal degradation of MFC/LS/CP materials in blends as well as in a separated form. The resulting carbons were further characterized in terms of morphology, microstructure and physical properties (such as density, electrical conductivity and mechanical strength). At 900°C, MFC/LS/CP carbons displayed a high electrical conductivity of 47.8 S/cm together with a low density of 0.74 g/cm3 as well as an important porosity of 0.58. They also achieved an elastic modulus maximum of 6.62 GPa. Such interesting electrical and mechanical properties would lead to a promising application of MFC/LS/CP- derived biocarbons in energy storage devices as electrode materials in close future.

LGP2 Ph.D. thesis (2017)

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Written by Anne Pandolfi

Date of update October 10, 2017

Communauté Université Grenoble Alpes