University Grenoble Alpes, CNRS, Grenoble INP, LGP2, Grenoble, France
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Pr Julien Bras (H index: 65; more than 200 scientific papers & 20 patents) is Professor at Grenoble Institute of Technology (Grenoble INP Pagora) in University Grenoble Alpes.
After engineer diploma in Chemistry and a PhD on Renewable Materials for biopackaging in 2004, he worked in industry few years and then left industry to become associate professor in 2006.
Since that time, he has directly supervised 40 PhD, 23 Post-doc and more than 70 master students.
He is member of Institut Universitaire de France (top delegation for french professor). Among the world’s Top 2% most-cited scientists, he received the French “Academy of Science” Major Prize of Innovation (IMT Espoir) in 2017, the international mid-career award from Tappi Nano in 2019 and the French “Academy of Science” Major price for chemistry of renewable materials in 2023.
During two years (2019-2021), he has worked in Nestle thanks to a disponibility sabbatical period as Senior Expert and Department Head in the Institute of Packaging Science in the global Nestle Research Center in Switzerland.
He is head of the “Multiscale Biobased Material” group (ab. 40 pers., 8 years). Since 2021, he is in charge of International Affairs of Grenoble INP Pagora and he has launched the Cellulose Valley Chair in 2022 with 8 companies for 5 years.
Through his different experiences, he develops several competences. His expertise deals particularly with (nano)cellulose and their functionalization, paper science, biobased and smart materials, mainly for sustainable packaging applications.
Numerous studies have been focused on the functionalization of cellulosic materials at different scale in order to bring new functions to this bio-based polymer widely available. For example, anti-oxidant, antibacterial, drug release or hydrophobic cellulose can be obtained for numerous applications (medical, packaging, composites, etc..). However most of the processes needs toxic solvents or toxic reagents which limit any technology transfer and so their industrialization. It is then urgent to propose more sustainable approaches for functionalizing the surface of cellulose and nanocellulose.
This presentation will focus on novel approaches using mainly water as solvent or even proposing alternative on physisorption or on “zero solvent” strategies.
A large overview of cellulose functionalization will be summarized and then some specific cases will be detailed. On one hand, multi step grafting or irreversible physisorption will be proposed for medical applications and drug release. On the other hand, zero solvent approach and water based amidation will be detailed for applications in active and barrier packaging fields. The last part will focus on a novel approach called mechanochemistry on cellulosic fibres for packaging and nanocellulose production developed within the Cellulose Valley which will be shortly introduced.
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