Cargando…

Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux

Colloidal fouling can be mitigated by membrane surface patterning. This contribution identifies the effect of different pattern geometries on fouling behavior. Nanoscale line-and-groove patterns with different feature sizes were applied by thermal embossing on commercial nanofiltration membranes. Th...

Descripción completa

Detalles Bibliográficos
Autores principales: Malakian, Anna, Zhou, Zuo, Messick, Lucas, Spitzer, Tara N., Ladner, David A., Husson, Scott M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7767534/
https://www.ncbi.nlm.nih.gov/pubmed/33371519
http://dx.doi.org/10.3390/membranes10120445
_version_ 1783628981568798720
author Malakian, Anna
Zhou, Zuo
Messick, Lucas
Spitzer, Tara N.
Ladner, David A.
Husson, Scott M.
author_facet Malakian, Anna
Zhou, Zuo
Messick, Lucas
Spitzer, Tara N.
Ladner, David A.
Husson, Scott M.
author_sort Malakian, Anna
collection PubMed
description Colloidal fouling can be mitigated by membrane surface patterning. This contribution identifies the effect of different pattern geometries on fouling behavior. Nanoscale line-and-groove patterns with different feature sizes were applied by thermal embossing on commercial nanofiltration membranes. Threshold flux values of as-received, pressed, and patterned membranes were determined using constant flux, cross-flow filtration experiments. A previously derived combined intermediate pore blocking and cake filtration model was applied to the experimental data to determine threshold flux values. The threshold fluxes of all patterned membranes were higher than the as-received and pressed membranes. The pattern fraction ratio (PFR), defined as the quotient of line width and groove width, was used to analyze the relationship between threshold flux and pattern geometry quantitatively. Experimental work combined with computational fluid dynamics simulations showed that increasing the PFR leads to higher threshold flux. As the PFR increases, the percentage of vortex-forming area within the pattern grooves increases, and vortex-induced shielding increases. This study suggests that the PFR should be higher than 1 to produce patterned membranes with maximal threshold flux values. Knowledge generated in this study can be applied to other feature types to design patterned membranes for improved control over colloidal fouling.
format Online
Article
Text
id pubmed-7767534
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-77675342020-12-28 Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux Malakian, Anna Zhou, Zuo Messick, Lucas Spitzer, Tara N. Ladner, David A. Husson, Scott M. Membranes (Basel) Article Colloidal fouling can be mitigated by membrane surface patterning. This contribution identifies the effect of different pattern geometries on fouling behavior. Nanoscale line-and-groove patterns with different feature sizes were applied by thermal embossing on commercial nanofiltration membranes. Threshold flux values of as-received, pressed, and patterned membranes were determined using constant flux, cross-flow filtration experiments. A previously derived combined intermediate pore blocking and cake filtration model was applied to the experimental data to determine threshold flux values. The threshold fluxes of all patterned membranes were higher than the as-received and pressed membranes. The pattern fraction ratio (PFR), defined as the quotient of line width and groove width, was used to analyze the relationship between threshold flux and pattern geometry quantitatively. Experimental work combined with computational fluid dynamics simulations showed that increasing the PFR leads to higher threshold flux. As the PFR increases, the percentage of vortex-forming area within the pattern grooves increases, and vortex-induced shielding increases. This study suggests that the PFR should be higher than 1 to produce patterned membranes with maximal threshold flux values. Knowledge generated in this study can be applied to other feature types to design patterned membranes for improved control over colloidal fouling. MDPI 2020-12-21 /pmc/articles/PMC7767534/ /pubmed/33371519 http://dx.doi.org/10.3390/membranes10120445 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Malakian, Anna
Zhou, Zuo
Messick, Lucas
Spitzer, Tara N.
Ladner, David A.
Husson, Scott M.
Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux
title Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux
title_full Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux
title_fullStr Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux
title_full_unstemmed Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux
title_short Understanding the Role of Pattern Geometry on Nanofiltration Threshold Flux
title_sort understanding the role of pattern geometry on nanofiltration threshold flux
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7767534/
https://www.ncbi.nlm.nih.gov/pubmed/33371519
http://dx.doi.org/10.3390/membranes10120445
work_keys_str_mv AT malakiananna understandingtheroleofpatterngeometryonnanofiltrationthresholdflux
AT zhouzuo understandingtheroleofpatterngeometryonnanofiltrationthresholdflux
AT messicklucas understandingtheroleofpatterngeometryonnanofiltrationthresholdflux
AT spitzertaran understandingtheroleofpatterngeometryonnanofiltrationthresholdflux
AT ladnerdavida understandingtheroleofpatterngeometryonnanofiltrationthresholdflux
AT hussonscottm understandingtheroleofpatterngeometryonnanofiltrationthresholdflux