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  1. Article ; Online: New design of microchip for in-situ DLS measurement of colloidal suspensions

    Claire Marliere / Sylvie Perrin / Didier Frot / Xavier Lefebvre / Eric Lécolier

    JCIS Open, Vol 11, Iss , Pp 100086- (2023)

    2023  

    Abstract: Stability of dispersed materials remains an important question in a wide variety of fields such as cosmetics, catalysis, food or energy and the environment. As stability is directly linked to the size of the dispersed colloids it is essential to assess ... ...

    Abstract Stability of dispersed materials remains an important question in a wide variety of fields such as cosmetics, catalysis, food or energy and the environment. As stability is directly linked to the size of the dispersed colloids it is essential to assess the size distribution of colloidal suspensions. Nowadays, microfluidic-based approaches generate increasing interest as they represent flexible and fast measurements allowing high throughput experimentations. However, characterization of colloidal dispersions is usually performed by dynamic light scattering (DLS), that requires static measurements as well as significant volumes, that are not compatible with on-line analysis and microfluidics. Moreover, due to flow-induced decorrelation terms, DLS measurements in microfluidic channels are only accurate at very low shear rates.This work aimed at developing an on-line microfluidic device for dispersed materials characterization using DLS. The main challenges of this project were i) to adapt the microfabrication of the PDMS device in order to combine microchannels of hundreds of microns with a milli-fluidic cavity to perform the DLS measurements, and ii) to downsize the DLS set up. A PDMS microchip, consisting in a millimeter cavity for DLS measurements in parallel with a microchannel, was designed to perform the measurement on the sample without stopping the suspension flow during the microfluidic experiment. The cavity geometry was then optimized thanks to numerical simulation to ensure a good sweep efficiency and to downscale as much as possible without impairing the DLS signal.By adapting the microfabrication process, a PDMS microfluidic chip was designed allowing the size measurements of successive suspensions containing 100 and 12 nm diameter particles. This work is a first step towards the implementation of a new technological building block for online microfluidic characterization.© 2017 Elsevier Inc. All rights reserved.
    Keywords Colloidal suspension ; Microfluidics ; Dynamic light scattering ; DLS ; Physical and theoretical chemistry ; QD450-801 ; Chemical technology ; TP1-1185
    Subject code 600
    Language English
    Publishing date 2023-10-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Assessment of Solute Transfer Between Static and Dynamic Water During Percolation Through a Solid Leach Bed in Dry Batch Anaerobic Digestion Processes

    Shewani, Anil / Etienne Paul / Gérald Debenest / Pierre Horgue / Sébastien Pommier / Sophie Decremps / Xavier Lefebvre

    Waste and biomass valorization. 2018 Nov., v. 9, no. 11

    2018  

    Abstract: The aim of this work was to characterize solute transfer between static and dynamic water during percolation through a solid leach bed reactor. A new experimental procedure was set up to measure the solute exchange rate between macro-and micro-porosity. ... ...

    Abstract The aim of this work was to characterize solute transfer between static and dynamic water during percolation through a solid leach bed reactor. A new experimental procedure was set up to measure the solute exchange rate between macro-and micro-porosity. Tracer tests were performed in closed-circuit recirculation experiments. The water behavior was modeled by a multiphase flow model in a double porosity medium using a previously published methodology. The solute exchange rate between static and dynamic water was described by first-order kinetics. The methodology was applied to wheat straw and solid cow manure beds. The solute exchange rate (h s was 0.054 and 0.324 h−1) for wheat straw and solid cow manure, respectively. The measured data was used to improve the prediction capacity of a CFD tool. The results of this work could be used to develop appropriate leachate recirculation strategies to optimize full-scale dry batch anaerobic digestion processes.
    Keywords anaerobic digestion ; cow manure ; leachates ; models ; porosity ; prediction ; solutes ; tracer techniques ; wheat straw
    Language English
    Dates of publication 2018-11
    Size p. 2081-2089.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 2541900-6
    ISSN 1877-265X ; 1877-2641
    ISSN (online) 1877-265X
    ISSN 1877-2641
    DOI 10.1007/s12649-017-0011-1
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Assessment of percolation through a solid leach bed in dry batch anaerobic digestion processes

    Shewani, Anil / Pierre Horgue / Sébastien Pommier / Gérald Debenest / Xavier Lefebvre / Emmanuel Gandon / Etienne Paul

    Bioresource technology. 2015 Feb., v. 178

    2015  

    Abstract: This work aimed at assessing water percolation through a solid cow manure leach bed in dry batch AD processes. A laboratory-scale percolation column and an experimental methodology were set up. Water behaviour was modelled by a double porosity medium ... ...

    Abstract This work aimed at assessing water percolation through a solid cow manure leach bed in dry batch AD processes. A laboratory-scale percolation column and an experimental methodology were set up. Water behaviour was modelled by a double porosity medium approach. An experimental procedure was proposed to determine the main hydrodynamic parameters of the multiphase flow model: the porosity, the permeability and the term for water exchange from macro- to micro-porosity. Micro- and macro-porosity values ranged from 0.42 to 0.70m3m−3 and 0.18 to 0.50m3m−3. Intrinsic permeability values for solid cow manure ranged from 5.55·10−11 to 4.75·10−9m2. The term for water exchange was computed using a 2nd order model. The CFD tool developed was used to simulate successive percolation and drainage operations. These results will be used to design leachate recirculation strategies and predict biogas production in full-scale dry AD batch processes.
    Keywords anaerobic digestion ; batch systems ; biogas ; cattle manure ; drainage ; hydrodynamics ; models ; permeability ; porosity
    Language English
    Dates of publication 2015-02
    Size p. 209-216.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1065195-0
    ISSN 1873-2976 ; 0960-8524
    ISSN (online) 1873-2976
    ISSN 0960-8524
    DOI 10.1016/j.biortech.2014.10.017
    Database NAL-Catalogue (AGRICOLA)

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