PhD (M/F) in Sonochemsitry and solid-liquid interfaces

Scientific Context and Objectives

Power ultrasound, whether at low or high frequency, is widely recognized for its physical and chemical effects, with applications ranging from process intensification (cleaning, degassing, solid-liquid extraction) to chemical reaction activation (catalysis). However, fundamental research on ultrasound mechanisms—particularly in heterogeneous media—remains limited, and operational parameters for industrial applications are poorly understood.

This PhD project aims to develop a novel sonochemical reactor combining dual-frequency ultrasound irradiation and fluidized bed technology. The dual-frequency approach leverages the synergy between chemical and physical effects, while fluidization enhances accessibility, heat/mass transfer, and continuous operation. The reactor will be designed for biomass valorization and molecule recovery, addressing key challenges in sustainable process engineering.

Research Program

The PhD candidate will:

• Design and construct the dual-frequency ultrasound-assisted fluidized bed reactor, following a preliminary literature review to confirm its innovative nature.
• Characterize the reactor’s energetic performance and sonochemical efficiency using established laboratory methodologies, complemented by hydrodynamic analysis.
• Optimize operating conditions (frequency, power, flow rate, solid loading) for heterogeneous applications, focusing on biomass valorization and high-value molecule extraction.
• Validate the reactor’s performance against traditional methods (e.g., maceration) for applications such as antioxidant extraction from agricultural waste (e.g., blueberry skins, nut shells) or algae processing (in collaboration with CEA Tech Cadarache).
• Compare results in terms of yield, energy efficiency, and scalability, with a focus on sustainable process development.

The project builds on prior research at CERMAV and LRP, including studies on cellulose microfibrils, ultrasound-assisted defibrillation, and sonochemical reactivity at solid-liquid interfaces.

Profile and Required Skills

• Master’s degree or engineering diploma (Bac+5) in Process Engineering, with complementary knowledge in chemistry and/or materials science highly valued.
• Familiarity with ultrasound technology and characterization techniques (e.g., calorimetry, sonoluminescence, chemical sensors) is advantageous.
• Strong motivation for experimental work, autonomy, and practical problem-solving skills.
• Upper-intermediate proficiency in French and English (written and oral) for effective scientific communication.
   

Working Environment

• Facilities: Access to advanced ultrasound equipment, fluidization pilots, and characterization tools at the Rheology and Processes Laboratory (LRP, CNRS/Grenoble INP).
• Collaborations: Partnerships with CERMAV, LGC Toulouse, IMT Mines-Albi, and CEA Marcoule, offering a rich interdisciplinary and industrial network.
• Supervision: Co-supervised by Sonia Molina-Boisseau (CERMAV) and LRP advisors, with regular progress meetings and external thesis committee reviews.
• Safety: Mandatory half-day safety training before handling ultrasound equipment.