Probing Biomass Nanorods Dielectric Properties

**Probing biomass nanorods dielectric properties**:

- Réf **ABG-126032**
- Stage master 2 / Ingénieur- Durée 6 mois- Salaire net mensuel 600- 30/09/2024- IMP (UMR 5223)- Lieu de travail- Lyon Auvergne-Rhône-Alpes France- Champs scientifiques- Matériaux
- Chimie- 29/11/2024**Établissement recruteur**:
Le Laboratoire présente un ensemble de compétences unique couvrant toute la chaîne de valeur dans le domaine des matériaux polymères. La force de l’IMP réside dans sa capacité à coordonner les savoirs scientifiques et les moyens pour mettre en œuvre une démarche d’ingénierie multi-échelle et pluridisciplinaire en assemblant des briques fondamentales issues de la chimie et de la physique des polymères mises en jeu dans les procédés de mise en œuvre à l’échelle laboratoire mais aussi à l’échelle pilote pour concevoir des matériaux polymères à architecture contrôlée, respectueux de l’environnement et porteurs de fonctionnalités.

**Description**:
**Keywords** : cellulose, chitin, nanocrystals, broadband dielectric spectrosocopy, permanent dipole, piezoelectric properties.

**Context**. Designing smart materials which can sense, actuate or harvest energy is a critical goal to address the current technological and environmental challenges. Cellulose and chitin are biosynthesized in the form of crystalline nanorods in numerous organisms (plant, algae, fungi, arthropod), constituting thus the most abundant biomass on Earth. Yet, their specific polar non centrosymmetric crystalline structure shall also provide them interesting dielectric properties which have been under-investigated, even if recently the presence of a giant electric dipole and of a tensile piezoelectricity were reported. [1-2]

[1] Frka-Petesic, B., Jean, B., & Heux, L. (2014). First experimental evidence of a giant permanent electric-dipole moment in cellulose nanocrystals. Europhysics Letters, 107(2), 28006.
[2] Barlemont, S., Burg, A., Serghei, A., Capsal, J. F., & Fumagalli, M. (2023). Macroscopic tensile piezoelectricity characterization of β-chitin in tubeworm tissues. Cellulose, 30(13), 8451-8458.

**Goal**. Evaluation of the relaxation and structuration of biomass nanorods colloidal suspensions in apolar solvents under an electrical field, and investigation of the influence of the nanoparticule structure on it.

**Methodology**. Preparation of cellulose nanocrystals from varying biological source (coton, tunicate, green algae) and redispersion in apolar solvents (electron microscopy, X ray diffraction, dynamic light scattering). Characterization of the resulting suspensions by broadband dielectric spectroscopy.

**Practical informations**. Internship for at least 6 months which can start as early as January 2025. We are looking for a student with a strong interest for experimental work, and a background in polymer materials. Additional skills in electrical measurements will be particularly valued.

**Profil**:
We are looking for a student with a strong interest for experimental work, and a background in polymer materials. Additional skills in electrical measurements will be particularly valued.

**Prise de fonction**:

- 06/01/2025