We studied some of the more employed microporous membrane filters via small-angle static light scattering under quasi-index matching conditions. We report data from both acetate of cellulose (AC) and mixed-esters of cellulose (MEC) membranes of various pore sizes ps. On short length scales, the membranes have fractal morphology. While AC filters may be described as surface fractals, MEC membranes turn out to be mass fractals. Furthermore, the scattered intensity distributions exhibit a peak at a finite wave vector qm, thus indicating the presence of a certain degree of spatial order over a characteristic length Λ = 2π/qm. A is found to increase with Ps, as expected, although it is always larger than ps and is not trivially related to it. We propose a description of the membrane structure which accounts for the experimental results and is further corroborated by mass density measurements.
Microporous membrane filters: A static light scattering study / L. Cipelletti, M. Carpineti, M. Giglio. - In: PHYSICA. A. - ISSN 0378-4371. - 235:1-2(1997), pp. 248-256. [10.1016/S0378-4371(96)00345-7]
Microporous membrane filters: A static light scattering study
M. Carpineti;M. Giglio
1997
Abstract
We studied some of the more employed microporous membrane filters via small-angle static light scattering under quasi-index matching conditions. We report data from both acetate of cellulose (AC) and mixed-esters of cellulose (MEC) membranes of various pore sizes ps. On short length scales, the membranes have fractal morphology. While AC filters may be described as surface fractals, MEC membranes turn out to be mass fractals. Furthermore, the scattered intensity distributions exhibit a peak at a finite wave vector qm, thus indicating the presence of a certain degree of spatial order over a characteristic length Λ = 2π/qm. A is found to increase with Ps, as expected, although it is always larger than ps and is not trivially related to it. We propose a description of the membrane structure which accounts for the experimental results and is further corroborated by mass density measurements.File | Dimensione | Formato | |
---|---|---|---|
1-s2.0-S0378437196003457-main.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
426.14 kB
Formato
Adobe PDF
|
426.14 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.