The role of wetting on the water flux performance of microsieve membranes

Miriam Girones nogue, Zandrie Borneman, Rob G.H. Lammertink, Matthias Wessling

Research output: Contribution to journalArticleAcademicpeer-review

30 Citations (Scopus)

Abstract

Microsieve membranes are microfabricated devices that possess a high and controlled porosity. Due to the extremely high product throughput, microsieves are very sensitive systems in terms of flux decline during clean water measurements. The goal of this investigation was to study the influence of the surface properties of silicon nitride microsieves and the hydrodynamic parameters on the clean water flux performance. First, we studied the properties of bare silicon nitride dices. Contact angles and XPS measurements clearly demonstrated that silicon nitride experiences aging and variations in its surface properties, making it necessary to hydrophilize and homogenize the substrates. To understand the role of the surface properties on the water permeation, the water flux through unmodified, hydrophilized and hydrophobized silicon nitride microsieves was studied as a function of the wetting procedure and the presence of air in the feed liquid. For most surfaces, a good wetting protocol and the exclusion of contaminating particles and air from the system led to stable fluxes. Hydrophobized membranes presented low performance when they were poorly wetted. In these cases, air was massively deposited on the surface, since the low working pressures made the filtration sensitive to air bubbles. For highly hydrophobized membranes (contact angle, ¿ = 112°) no stable fluxes could be measured due to rapid dewetting.
Original languageUndefined
Pages (from-to)55-64
JournalJournal of membrane science
Volume259
Issue number1-2
DOIs
Publication statusPublished - 2005

Keywords

  • IR-52610
  • METIS-224251

Cite this

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title = "The role of wetting on the water flux performance of microsieve membranes",
abstract = "Microsieve membranes are microfabricated devices that possess a high and controlled porosity. Due to the extremely high product throughput, microsieves are very sensitive systems in terms of flux decline during clean water measurements. The goal of this investigation was to study the influence of the surface properties of silicon nitride microsieves and the hydrodynamic parameters on the clean water flux performance. First, we studied the properties of bare silicon nitride dices. Contact angles and XPS measurements clearly demonstrated that silicon nitride experiences aging and variations in its surface properties, making it necessary to hydrophilize and homogenize the substrates. To understand the role of the surface properties on the water permeation, the water flux through unmodified, hydrophilized and hydrophobized silicon nitride microsieves was studied as a function of the wetting procedure and the presence of air in the feed liquid. For most surfaces, a good wetting protocol and the exclusion of contaminating particles and air from the system led to stable fluxes. Hydrophobized membranes presented low performance when they were poorly wetted. In these cases, air was massively deposited on the surface, since the low working pressures made the filtration sensitive to air bubbles. For highly hydrophobized membranes (contact angle, ¿ = 112°) no stable fluxes could be measured due to rapid dewetting.",
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journal = "Journal of membrane science",
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The role of wetting on the water flux performance of microsieve membranes. / Girones nogue, Miriam; Borneman, Zandrie; Lammertink, Rob G.H.; Wessling, Matthias.

In: Journal of membrane science, Vol. 259, No. 1-2, 2005, p. 55-64.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - The role of wetting on the water flux performance of microsieve membranes

AU - Girones nogue, Miriam

AU - Borneman, Zandrie

AU - Lammertink, Rob G.H.

AU - Wessling, Matthias

PY - 2005

Y1 - 2005

N2 - Microsieve membranes are microfabricated devices that possess a high and controlled porosity. Due to the extremely high product throughput, microsieves are very sensitive systems in terms of flux decline during clean water measurements. The goal of this investigation was to study the influence of the surface properties of silicon nitride microsieves and the hydrodynamic parameters on the clean water flux performance. First, we studied the properties of bare silicon nitride dices. Contact angles and XPS measurements clearly demonstrated that silicon nitride experiences aging and variations in its surface properties, making it necessary to hydrophilize and homogenize the substrates. To understand the role of the surface properties on the water permeation, the water flux through unmodified, hydrophilized and hydrophobized silicon nitride microsieves was studied as a function of the wetting procedure and the presence of air in the feed liquid. For most surfaces, a good wetting protocol and the exclusion of contaminating particles and air from the system led to stable fluxes. Hydrophobized membranes presented low performance when they were poorly wetted. In these cases, air was massively deposited on the surface, since the low working pressures made the filtration sensitive to air bubbles. For highly hydrophobized membranes (contact angle, ¿ = 112°) no stable fluxes could be measured due to rapid dewetting.

AB - Microsieve membranes are microfabricated devices that possess a high and controlled porosity. Due to the extremely high product throughput, microsieves are very sensitive systems in terms of flux decline during clean water measurements. The goal of this investigation was to study the influence of the surface properties of silicon nitride microsieves and the hydrodynamic parameters on the clean water flux performance. First, we studied the properties of bare silicon nitride dices. Contact angles and XPS measurements clearly demonstrated that silicon nitride experiences aging and variations in its surface properties, making it necessary to hydrophilize and homogenize the substrates. To understand the role of the surface properties on the water permeation, the water flux through unmodified, hydrophilized and hydrophobized silicon nitride microsieves was studied as a function of the wetting procedure and the presence of air in the feed liquid. For most surfaces, a good wetting protocol and the exclusion of contaminating particles and air from the system led to stable fluxes. Hydrophobized membranes presented low performance when they were poorly wetted. In these cases, air was massively deposited on the surface, since the low working pressures made the filtration sensitive to air bubbles. For highly hydrophobized membranes (contact angle, ¿ = 112°) no stable fluxes could be measured due to rapid dewetting.

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