Details
| Original language | English |
|---|---|
| Pages (from-to) | 7-14 |
| Number of pages | 8 |
| Journal | Journal of membrane science |
| Volume | 289 |
| Issue number | 1-2 |
| Publication status | Published - 24 Nov 2006 |
Abstract
Asymmetric membrane structures provide greater permeability due to reduced flow resistance and more efficient separation. The aim of this study was to produce a cellulose acetate (CA) microfiltration membrane with an asymmetric structure that combines a prefilter layer and selective layer in one membrane and, secondarily, to investigate how the new CA-based solvent system for manufacturing membranes affects membrane morphology. Asymmetric CA microfiltration membranes were prepared by a single-layer dry-casting process using a pseudo-ternary mixture of CA, methyl formate (MF), 2-propanol and water. The resulting membranes consisted of two isotropic regions with almost uniform pore size covered by a protective skin. Unlike other asymmetric membranes, the selective layer of these developed CA microfiltration membranes faced the solid-liquid interface, while the upper region facing the liquid-gas interface exhibited larger pore sizes. The top layer acted like a prefilter, and the denser bottom layer like a selective layer. Structural studies of the membranes were conducted by scanning electron microscopy. The membrane structures identified are discussed in detail and a theory about the events taking place in the casting solution during membrane formation.
Keywords
- Cellulose acetate, Dry-casting process, Membrane morphology, Microfiltration, Morphological studies
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Biochemistry
- Materials Science(all)
- General Materials Science
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Filtration and Separation
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In: Journal of membrane science, Vol. 289, No. 1-2, 24.11.2006, p. 7-14.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Structural development of asymmetric cellulose acetate microfiltration membranes prepared by a single-layer dry-casting method
AU - Sossna, Melanie
AU - Hollas, Markus
AU - Schaper, Jörg
AU - Scheper, Thomas
PY - 2006/11/24
Y1 - 2006/11/24
N2 - Asymmetric membrane structures provide greater permeability due to reduced flow resistance and more efficient separation. The aim of this study was to produce a cellulose acetate (CA) microfiltration membrane with an asymmetric structure that combines a prefilter layer and selective layer in one membrane and, secondarily, to investigate how the new CA-based solvent system for manufacturing membranes affects membrane morphology. Asymmetric CA microfiltration membranes were prepared by a single-layer dry-casting process using a pseudo-ternary mixture of CA, methyl formate (MF), 2-propanol and water. The resulting membranes consisted of two isotropic regions with almost uniform pore size covered by a protective skin. Unlike other asymmetric membranes, the selective layer of these developed CA microfiltration membranes faced the solid-liquid interface, while the upper region facing the liquid-gas interface exhibited larger pore sizes. The top layer acted like a prefilter, and the denser bottom layer like a selective layer. Structural studies of the membranes were conducted by scanning electron microscopy. The membrane structures identified are discussed in detail and a theory about the events taking place in the casting solution during membrane formation.
AB - Asymmetric membrane structures provide greater permeability due to reduced flow resistance and more efficient separation. The aim of this study was to produce a cellulose acetate (CA) microfiltration membrane with an asymmetric structure that combines a prefilter layer and selective layer in one membrane and, secondarily, to investigate how the new CA-based solvent system for manufacturing membranes affects membrane morphology. Asymmetric CA microfiltration membranes were prepared by a single-layer dry-casting process using a pseudo-ternary mixture of CA, methyl formate (MF), 2-propanol and water. The resulting membranes consisted of two isotropic regions with almost uniform pore size covered by a protective skin. Unlike other asymmetric membranes, the selective layer of these developed CA microfiltration membranes faced the solid-liquid interface, while the upper region facing the liquid-gas interface exhibited larger pore sizes. The top layer acted like a prefilter, and the denser bottom layer like a selective layer. Structural studies of the membranes were conducted by scanning electron microscopy. The membrane structures identified are discussed in detail and a theory about the events taking place in the casting solution during membrane formation.
KW - Cellulose acetate
KW - Dry-casting process
KW - Membrane morphology
KW - Microfiltration
KW - Morphological studies
UR - http://www.scopus.com/inward/record.url?scp=33846785584&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2006.11.024
DO - 10.1016/j.memsci.2006.11.024
M3 - Article
AN - SCOPUS:33846785584
VL - 289
SP - 7
EP - 14
JO - Journal of membrane science
JF - Journal of membrane science
SN - 0376-7388
IS - 1-2
ER -