CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)

Revista con referato

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Autor principal: D´Onofrio, Alejandro Gustavo
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: ACS Publications 2026
Materias:
Microbubbles
Silicone Oil
CO2
Henry's Constant
Anomalous Diffusion
Ingeniería del Medio Ambiente
Acceso en línea:http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2733
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Repositorio Institucional Digital de Acceso Abierto (UNGS) de Universidad Nacional de General Sarmiento
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spelling I71-R177-UNGS-27332026-01-15T21:08:06Z CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion) D´Onofrio, Alejandro Gustavo Microbubbles Silicone Oil CO2 Henry's Constant Anomalous Diffusion Ingeniería del Medio Ambiente Revista con referato Fil: D'Onofrio, Alejandro Gustavo. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina. Fil: D'Onofrio, Alejandro Gustavo. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Física. Grupo de Medios Porosos; Argentina. Fil: D'Onofrio, Alejandro Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. This work demonstrates the utility of microfluidic devices for characterizing diffusion mechanisms. We determined Henry’s constant and characterized the diffusion process of gaseous CO2 in silicone oil. Using microfluidic techniques, we analyzed the evolution of the CO2 bubble size in a solvent flowing through a microchannel system. The reduction in bubble size due to the mass transfer of gaseous CO2 into the solvent fluid primarily affects their length. A microfluidic device was used to produce bubbles, consisting of a pressure-driven injection system for the gas and a flow-driven system for the liquid. Additionally, an optical device was coupled for tracking and studying the bubbles in the microchannels, enabling us to study their spatial and temporal evolution using image analysis. From this study, we found two diffusion regimes. The first is a superdiffusive process for short times. In this regime, due to the high concentration gradient values at the gas–liquid interface, we observed a higher rate of carbon dioxide transfer to the silicone oil. At longer times, we see that the gas transfer rate significantly decreases compared to the previous regime, leading to a subdiffusive process. In this latter regime, it was found that if we increase the gas pressure, the system approaches a normal diffusive process that coincides with previously conducted studies by other researchers. It is suggested that the subdiffusion could be due to the high degree of confinement of the bubbles within the microchannel, similar to what occurs in porous media, the high viscosity of the fluid, and the low gas pressure used in the tests. The microfluidic device proved to be a very efficient method for determining the diffusion process and Henry’s constant in this case. Its easy fabrication and low cost make this type of device appropriate for substance characterization. 2026-01-15T21:08:06Z 2026-01-15T21:08:06Z 2024 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion D´Onofrio, A. G. y Freytes, V. M. (2024). CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion). Langmuir, 41(2), 1207-1216. 0743-7463 http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2733 eng http://dx.doi.org/10.1021/acs.langmuir.4c02020 info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf ACS Publications Langmuir. Nov. 2024; 41(2): 1207-1216 https://pubs.acs.org/toc/langd5/41/2?ref=breadcrumb
institution Universidad Nacional de General Sarmiento
institution_str I-71
repository_str R-177
collection Repositorio Institucional Digital de Acceso Abierto (UNGS)
language Inglés
orig_language_str_mv eng
topic Microbubbles
Silicone Oil
CO2
Henry's Constant
Anomalous Diffusion
Ingeniería del Medio Ambiente
spellingShingle Microbubbles
Silicone Oil
CO2
Henry's Constant
Anomalous Diffusion
Ingeniería del Medio Ambiente
D´Onofrio, Alejandro Gustavo
CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)
topic_facet Microbubbles
Silicone Oil
CO2
Henry's Constant
Anomalous Diffusion
Ingeniería del Medio Ambiente
description Revista con referato
format Artículo
Artículo
publishedVersion
author D´Onofrio, Alejandro Gustavo
author_facet D´Onofrio, Alejandro Gustavo
author_sort D´Onofrio, Alejandro Gustavo
title CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)
title_short CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)
title_full CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)
title_fullStr CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)
title_full_unstemmed CO2 Microbubbles in Silicone Oil (Part II: Henry’s Constant and Anomalous Diffusion)
title_sort co2 microbubbles in silicone oil (part ii: henry’s constant and anomalous diffusion)
publisher ACS Publications
publishDate 2026
url http://repositorio.ungs.edu.ar:8080/xmlui/handle/UNGS/2733
work_keys_str_mv AT donofrioalejandrogustavo co2microbubblesinsiliconeoilpartiihenrysconstantandanomalousdiffusion
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