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Open AccessArticle

Impact of Two-Dimensional Particle Size Distribution on Estimation of Water Vapor Diffusivity in Micrometric Size Cellulose Particles

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JRU IATE 1208—CIRAD/INRA/Montpellier Supagro/University of Montpellier, 2 Place Pierre Viala, Bat 31, F-34060 Montpellier, France
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INRA, Biopolymères Interactions Assemblages (BIA), Rue de la Geraudière, F-44000 Nantes, France
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1712; https://doi.org/10.3390/ma11091712
Received: 24 July 2018 / Revised: 1 September 2018 / Accepted: 9 September 2018 / Published: 13 September 2018
This work aims at assessing the impact of two-dimensional particle size distribution (2D-PSD) on the identification of water vapor diffusivity in micrometric size cellulose particles displaying a size aspect ratio lower than 2 and a cylindrical shape. First, different methodologies to obtain the two-dimensional (2D) particle size distribution (diameter versus length) were compared, based on image analysis. Then, experimental sorption kinetics were obtained by using a quartz crystal microbalance (QCM) coupled with a water vapor adsorption system. Diffusivity values were estimated when considering either the 2D-PSD or global descriptors, such as the mean or median diameter and length of particles. Results revealed that the use of an analytical approach when considering the 2D mean-PSD or the median-PSD was the most accurate way to get diffusivity values at the scale of particles in a polydisperse sample of cellulose particles. Following this approach, a water vapor apparent diffusivity of 3.1 × 10−12 ± 2.3 × 10−12 m2·s−1 was found for the considered cellulose sample. Neglecting PSD in diffusivity estimation led to an underestimation of a factor of 2. This procedure could be extended for all the polydisperse samples in order to have an accurate estimation of water vapor diffusivity at the scale of single particles. View Full-Text
Keywords: cellulose; quartz crystal microbalance; particle size distribution; apparent diffusivity; water vapor cellulose; quartz crystal microbalance; particle size distribution; apparent diffusivity; water vapor
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MDPI and ACS Style

Thoury-Monbrun, V.; Angellier-Coussy, H.; Guillard, V.; Legland, D.; Gaucel, S. Impact of Two-Dimensional Particle Size Distribution on Estimation of Water Vapor Diffusivity in Micrometric Size Cellulose Particles. Materials 2018, 11, 1712.

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