Publications by authors named "S Molina-Boisseau"
Sonochemical activity in ultrasonic reactors under heterogeneous conditions.
Ultrason Sonochem
April 2021
Due to its physical and chemical effects, ultrasound is widely used for industrial purposes, especially in heterogeneous medium. Nevertheless, this heterogeneity can influence the ultrasonic activity. In this study, the effect of the addition of inert glass beads on the sonochemical activity inside an ultrasonic reactor is investigated by monitoring the formation rate of triiodide, and the ultrasonic power is measured by calorimetry and by acoustic radiation.
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- Researchers developed rubber materials using a diene elastomer and tailored nanocellulose fillers, achieving better mechanical reinforcement.
- The nanocellulose was derived from freeze-dried cellulose nanocrystals and microfibrillated cellulose with high specific surface areas, modified for better compatibility with the rubber matrix.
- Enhanced materials showed significant modulus increases and maintained flexibility; in some cases, the stress-stiffening behavior resulted in ultimate stress increases of up to 7 times compared to the unfilled matrix.
In this exploratory work, the comparison of the utilisation of different non-conventional technologies (ultrasound and microwave irradiations) for the depolymerisation of a complex industrial starch-based waste into reducing sugars was investigated. Reducing sugars could then be converted into higher value-added compounds such as higher alcohols. The experiments were performed on three different starting materials named as 'Potato flour', 'Wet potato sludge' and 'Dry potato sludge'.
View Article and Find Full Text PDFA phenomenological modeling approach was developed to try to understand the reinforcing mechanism of starch nanocrystals in a nonvulcanized natural rubber matrix. Natural rubber was not cross-linked to maintain the biodegradability of the biosourced materials. Nonlinear dynamic mechanical experiments highlighted the significant reinforcing effect of starch nanocrystals and the presence of the Mullins and Payne effects.
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- A novel synthetic method for surface esterification has been developed using palmitoyl chloride on high crystallinity cellulose substrates, monitored by solid-state CP-MAS (13)C NMR.
- The degree of grafting varied based on experimental conditions and the specific cellulose type, influencing the structural and morphological changes observed through scanning electron microscopy and X-ray diffraction.
- The process results in fully grafted surfaces while keeping the cellulose core intact, allowing for high substitution rates under specific conditions that yield distinct X-ray diffraction patterns.