Permeation porometry: Effect of probe diffusion in the condensate

Mottern, Matthew L.; Shqau, Krenar; Zalar, Frank M.; Verweij, H.

doi:10.1016/j.memsci.2007.08.053

Cited by 18 publications

(17 citation statements)

References 17 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The substrate pore had a typical diameter (Øp) of $40 nm and can be considered as the interstitial space between three densepacked surface grains of a-Al 2 O 3 ; these grains were <300 nm in size, smaller than the bulk ones. [28] This was also confirmed by energy dispersive X-ray spectrometry (EDX) analysis of the cross-section shown, which did not reveal any silicon in the support (Fig. 6).…”

Section: Zeta Potential Measurements and Zeolite A Seed Layer Formationsupporting

confidence: 54%

“…A custom built permeation porometry setup, described elsewhere [28,32], was used to evaluate the presence of connected meso-defects in the continuous zeolite membrane. A desorption method was used, in which the membrane was first saturated for 48 h by allowing cyclohexane (99.9% purity, Fisher Scientific) to condense within it and close all active pores to gas permeation.…”

Section: Methodsmentioning

confidence: 99%

“…Cyclohexane was used for selective blocking of intercrystalline pores below a certain size; simultaneous oxygen (kinetic Ø is 0.35 nm) permeation was used to determine the open porosity above that size. [28] Cyclohexane is too big to fit in the zeolite NaA micro-pores. Cumulative O 2 permeance, measured during cyclohexane desorption, showed a primary inflection at $20 nm apparent Øp, creating an upper boundary for defect size detection (Fig.…”

Section: T a Kuzniatsova Et Al / Zeolite A Membranes On Macroporoumentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Thin, Oriented Zeolite A Membranes on a Macroporous Support

Kuzniatsova

Mottern

Chiu

et al. 2008

Adv Funct Materials

View full text Add to dashboard Cite

Continuous, thin, oriented zeolite A membranes are produced by a two‐step synthesis on macroporous α‐Al2O3 supports. In the first step, zeolite A nano‐cubes with ∼350‐nm edges are prepared as a native impurity phase in zeolite Y synthesis dispersions, the support surface is pre‐modified with a cationic polymer having a selective affinity for zeolite A. The thus‐treated support is contacted with a colloidally stable dispersion of zeolite A and Y mixture in water, which results in selective, dense‐packed deposition of the zeolite A cubes with one face aligned to the average support surface. In a second step of hydrothermal epitaxial growth, the seed layer grows epitaxially into a continuous, meso‐defect free, ∼1 µm thick zeolite A layer, already after 1 h of treatment. This microstructure of the membrane compares very favorably to what is commonly obtained. The pH value of the zeolite mixture suspension is found to have a major influence on seed layer morphology, and thereby, on the quality and orientation of zeolite A membrane after short synthesis times. The final zeolite A membrane thickness and morphology is controlled by varying secondary growth synthesis time. The approach presented is thought to be of generic use for the preparation of oriented zeolite membranes.

show abstract

Section: Zeta Potential Measurements and Zeolite A Seed Layer Formationsupporting

confidence: 54%

Section: Methodsmentioning

confidence: 99%

Section: T a Kuzniatsova Et Al / Zeolite A Membranes On Macroporoumentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of Thin, Oriented Zeolite A Membranes on a Macroporous Support

Kuzniatsova

Mottern

Chiu

et al. 2008

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…The porosity and tortuosity values for these membranes were taken as 0.4 and 3, respectively [18,23]. The thickness of the active filtering layer ( x) is 15 m [17,18].…”

Section: Water Permeationmentioning

confidence: 99%

Removal of char particles from fast pyrolysis bio-oil by microfiltration

Javaid

Ryan

Berg

et al. 2010

Journal of Membrane Science

View full text Add to dashboard Cite

“…Regardless of the preparation method of the top layer, its properties are also affected by the characteristics of the support layer [1], which include its surface roughness, pore size distribution, and defects, etc. Amongst these characteristics, the presence of pinholes in the support (connected pores) that are several times larger than the average pore size of the support drastically reduces the integrity and selectivity of the subsequent layer [2][3][4]. Generally speaking, there are several reasons why it is difficult to avoid the occurrence of pinholes in supports during their preparation [5], e.g., the non-uniform dispersion of particles in suspension and the relatively unrestrained shrinking of particles when being sintered to a symmetric structure.…”

Section: Introductionmentioning

confidence: 99%