Zur Charakterisierung poröser Polymerstrukturen durch quantitative Bildauswertung elektronenmilkroskopischer Aufnahmen

Purz, H. ‐J.; Rosin, C.; Philipp, B.; Stiller, K.J.; Zglinicki, Th. v.

doi:10.1002/actp.1981.010321111

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…21, No. 3,1989 The micro-phase separation may occur simultaneously from the outer and inner surfaces of the solution resulting in the same pore characteristics in both membrane surfaces. When the micro-phase separation proceeds at the same time from outer and inner surfaces with the same speed to the inside of the membrane, as is the case of a RC hollow fiber, the pore characteristics vs. Z/d curves may show a symmetrical pattern with respect to Z/d = 0.5.…”

Section: Characteristic Features Of a Porous Hollow Fiber Prepared Bymentioning

confidence: 99%

“…Merin and Cheryan 2 studied the structure or a plane ultrafiltration polysulfone membrane, using scanning and transm1ss10n electron microscopes (SEM and TEM) and estimated pore radius distribution of the surface layer of the membrane. Based on electron microscopic observation on a cross section of a cellulose acetate plane membrane, Purz et al 3 suggested that pore radius distribution depends on the distance from the surface of the membrane. However, in characterizing a membrane by electron microscope, only the observation of the surface and cross section of a membrane has been carried out to date.…”

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An Electromicrographical Method for Evaluating Layer Structure of Polymeric Hollow Fiber Membrane

Kamide¹,

Nakamura²,

Akedo³

et al. 1989

Polym J

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ABSTRACT:An attempt was made to establish a novel electron micrographic method (aslant sliced thin sectional (ASTS) method) for evaluating pore characteristics, such as mean pore radius, pore radius distribution and porosity on inner layer at a given distance from the outer or inner wall of a porous polymeric hollow fiber membrane and to apply the method for clarifying the effect of preparatory conditions of the membrane on pore characteristics. Regenerated cellulose, cellulose diacetate, poly(vinyl alcohol) and polypropylene hollow fiber membranes for electron microscopic observation were sliced obliquely along the fiber axis at an angle 0 (0<0<2.5") to give a thin section with a thickness less than I µm. The method affords us the information on continuous changes in pore characteristics along the radial direction, where the normal line of the section intercepts the fiber axis at angle 90-0 degree. The electron microscopic image obtained for a portion of an aslant sliced thin section could not be distinguished from those obtained by a thin section cut strictly parallel to the fiber axis (i.e., 0=0). The ASTS method has the following advantages: (I) The location of a sliced section film can be evaluated accurately; (2) only a single operation to slice the sample section is needed; and (3) information on pore characteristics can be obtained continuously along the membrane thickness.

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Section: Characteristic Features Of a Porous Hollow Fiber Prepared Bymentioning

confidence: 99%

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confidence: 99%

An Electromicrographical Method for Evaluating Layer Structure of Polymeric Hollow Fiber Membrane

Kamide¹,

Nakamura²,

Akedo³

et al. 1989

Polym J

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Morphometrische Untersuchungen an asymmetrischen Celluloseacetatmembranen

Hirte¹,

Rosin²,

Philipp³

1991

Acta Polymerica

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Die Porenstruktur asymmetrischer Cellulose-2,5-acetat-Membranen wurde mittels elektronenmikroskopischer Aufnahmen der Oberfliichenabdriicke von Schnitten senkrecht zur Membranebene charakterisiert. Unter der Voraussetzung kugelformiger Poren und einer logarithmischen Normalverteilung der Porengrokn gelangen Aussagen uber den der trennaktiven Randschicht unmittelbar benachbarten Bereich der Membran. Morphometric investigation of asymmetric cellulose acetate membranesThe pore structure of asymmetric cellulose-2.5-acetate membranes has been characterized by means of electron micrographs of surface replicas of sections perpendicular to the membrane direction. Assuming a sphere model of pore geometry and a logarithmic normal distribution of pore sizes it was possible to describe the membrane range in direct neighbourhood of the outer layer which is active in separation.

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Determination of Pore Radius Distribution of Porous Polymeric Membranes by Electron Microscopic Method

Manabe

Shigemoto

Kamide

1985

Polym J

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An attempt was made to establish a method for evaluating the pore characteristics of porous polymeric membrane having the mean pore diameter larger than 10 nm through electron micrograph with help of stereology (EM method). For this purpose, ellipsoidal, spherical, and straight-through cylindrical pore models were adopted. Theoretical equations relating the pore radius distribution function N(r) to the distribution function F(x) of the length x of test lines cut off by pores in an electron micrograph were derived as follows;

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Zur Charakterisierung poröser Polymerstrukturen durch quantitative Bildauswertung elektronenmilkroskopischer Aufnahmen

Cited by 3 publications

References 3 publications

An Electromicrographical Method for Evaluating Layer Structure of Polymeric Hollow Fiber Membrane

An Electromicrographical Method for Evaluating Layer Structure of Polymeric Hollow Fiber Membrane

Morphometrische Untersuchungen an asymmetrischen Celluloseacetatmembranen

Determination of Pore Radius Distribution of Porous Polymeric Membranes by Electron Microscopic Method

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