Mélanie Girard

Polytechnique Montréal

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Marie‐Claude Heuzey

Polytechnique Montréal

Jason R. Tavares

Polytechnique Montréal

François Bertrand

Polytechnique Montréal

Noëlle Billon

Centre de Mise en Forme des Matériaux

Christelle Combeaud

Centre de Mise en Forme des Matériaux

A. Karthikeyan

Polytechnique Montréal

Daniel Therriault

Polytechnique Montréal

David Vidal

Polytechnique Montréal

Marie‐Josée Dumont

McGill University

Gérald Chouinard

Institut de Recherche et de Développement en Agroenvironnement

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Polytechnique Montréal

McGill University

Centre National de la Recherche Scientifique

Université de Montréal

Centre de Mise en Forme des Matériaux

École Nationale Supérieure des Mines de Paris

Université Paris Sciences et Lettres

ParisTech

École Polytechnique

Université Laval

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A technique for the ultrasonic dispersion of larger quantities of cellulose nanocrystals with in-line validation

Chemical Engineering Journal (2022)

Mélanie Girard François Bertrand Jason R. Tavares Marie‐Claude Heuzey

Rheometry

Sonication

10.1016/j.cej.2022.137434

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Citations (1)

3D printed protein/polysaccharide food simulant for dysphagia diet: Impact of cellulose nanocrystals

Food Hydrocolloids (2023)

Chi Zhang Changsheng Wang Mélanie Girard Daniel Therriault Marie‐Claude Heuzey

Whey protein isolate

3d printed

10.1016/j.foodhyd.2023.109455

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Citations (32)

Rheological insights on the evolution of sonicated cellulose nanocrystal dispersions

Ultrasonics Sonochemistry (2021)

Mélanie Girard François Bertrand Jason R. Tavares Marie‐Claude Heuzey

Cellulose nanocrystals (CNCs) are promising biomaterials, but their tendency to agglomerate when dried limits their use in several applications. Ultrasonication is commonly used to disperse CNCs in water, bringing enough energy to the suspension to break agglomerates. While the optimized parameters for sonication are now well defined for small volumes of low concentration CNC suspensions, a deeper understanding of the influence of the dispersing process is needed to work with larger volumes, at higher concentrations. Herein, rheology is used to define the distribution and dispersion states upon ultrasonication of a 3.2 wt% CNC suspension. After considering the importance of the measurement sampling volume, the behavior of a more concentrated suspension (6.4 wt%) is examined and compared with a never-dried suspension of the same concentration to validate the dispersion state.

Sonication

Suspension

Agglomerate

10.1016/j.ultsonch.2021.105747

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Citations (15)

Surface Modification of Commercially Available PLA Polymer Mesh

Industrial & Engineering Chemistry Research (2022)

A. Karthikeyan Mélanie Girard Marie‐Josée Dumont Gérald Chouinard Jason R. Tavares

Poly(lactic acid) (PLA) is a promising environmentally friendly candidate to replace petroleum-based polymers. However, its inherent hydrophilic wettability is a drawback for applications in the textile and packaging industry, and outdoor applications such as exclusion nets on plants. Even though researchers have successfully altered the wettability of tightly controlled amorphous PLA samples in the lab, none have yet reported the modification of commercial PLA. The goal of this article was to develop an easily scalable surface modification technique to alter the wettability of commercially available, highly crystalline PLA. In this work, a surface modification technique─called dip-dip-dry (DDD)─previously validated for amorphous three-dimensional (3D)-printed PLA, has been optimized for transforming the wettability of commercially available PLA material. Herein, we utilized a short preheat treatment in ethylene glycol to reduce the surface crystallinity (confirmed via X-ray diffraction analysis) to enable microstructure formation using acetone/water as a solvent/coagulant sequence. The change in wettability from hydrophilic to superhydrophobic has been attributed to an increase in surface roughness, with the change in surface topography confirmed using scanning electron microscopy.

Surface Modification

10.1021/acs.iecr.2c02502

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Citations (5)

Evidence-based guidelines for the ultrasonic dispersion of cellulose nanocrystals

Ultrasonics Sonochemistry (2020)

Mélanie Girard David Vidal François Bertrand Jason R. Tavares Marie‐Claude Heuzey

Nanoparticles possess unique, size-driven properties. However, they can be challenging to use as they easily agglomerate - their high surface area-to-volume ratio induces strong interparticle forces, generating agglomerates that are difficult to break. This issue prevails in organic particles as well, such as cellulose nanocrystals (CNCs); when in their dried form, strong hydrogen bonding enhances agglomeration. Ultrasonication is widely applied to prepare CNC suspensions, but the methodology employed is non-standardized and typically under-reported, and process efficiency is unknown. This limits the ability to adapt dispersion protocols at industrial scales. Herein, numerical simulations are used in conjunction with validation experiments to define and optimize key parameters for ultrasonic dispersion of CNCs, allowing an operating window to be inferred.

Agglomerate

Sonication

10.1016/j.ultsonch.2020.105378

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Citations (56)

Etude de la stabilité dimensionnelle d’un PET étiré au-dessus de sa transition vitreuse : Effets de la microstructure induite par l’étirage

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Christelle Combeaud Mélanie Girard Noëlle Billon

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Effects of annealing prior to stretching on strain induced crystallization of polyethylene terephthalate