Permeation through a heterogeneous membrane: the effect of the dispersed phase

Bouma, R.H.B.; Checchetti, Andrea; Chidichimo, Giuseppe; Drioli, Enrico

doi:10.1016/s0376-7388(96)00303-1

Cited by 235 publications

(239 citation statements)

References 8 publications

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“…The aggregate shape is clearly nonuniform compared with the others that appear better dispersed and have a more uniform aggregate size. It is noteworthy that the relative permeability is almost identical for the nanocomposite membranes containing less than 20 vol.% silica, indicating that the local flow pattern around a filler particle is not disturbed by the presence of other particles [6].…”

Section: Microporous Morphologymentioning

confidence: 90%

“…7. Gas permeability of N2 ( ), O2 (᭹), and CO2 ( ) influenced by the incorporation of silica nanoparticles relative to that in unfilled PIM-1 membrane as a function of true silica volume fraction; properties were measured at 25 • C and p of 50 psig after being soaked in methanol and dried at 100 • C in a vacuum oven; the dotted line represents highly permeable dispersed phase by the Bruggeman's model [6]. nanoparticle aggregates, or as a result of nanoparticle-induced disruption of polymer chain packing is barely distinguishable.…”

Section: Gas Permeation Properties Of Pim-1/silica Mixed-matrix Membrmentioning

confidence: 99%

“…Subsequent studies [2][3][4] have shown that the gas permeability of non-porous inorganic (e.g., fumed silica, MgO, TiO 2 )-filled glassy polymeric mixed-matrix membranes do not behave according to the Maxwell [5] and other proposed models [6,7], which predict lower gas permeabilities than in unfilled polymers. Especially, nanosized non-porous fumed silica particles embedded in glassy polymer matrices have a tendency to form aggregates, which result in disruption of polymer packing and the creation of void spaces.…”

Section: Introductionmentioning

confidence: 99%

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Gas transport behavior of mixed-matrix membranes composed of silica nanoparticles in a polymer of intrinsic microporosity (PIM-1)

Ahn

Chung

Pinnau

et al. 2010

Journal of Membrane Science

254

189

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Gas transport behavior of mixed-matrix membranes composed of silica nanoparticles in a polymer of intrinsic microporosity (PIM-1) Ahn, Juhyeon; Chung, Wook-Jin; Pinnau, Ingo; Song, Jingshe; Du, Naiying; Robertson, Gilles P.; Guiver, Michael D.This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Recently, high-free volume, glassy ladder-type polymers, referred to as polymers of intrinsic microporosity (PIM), have been developed and their reported gas transport performance exceeded the Robeson upper bound trade-off for O 2 /N 2 and CO 2 /CH 4 . The present work reports the gas transport behavior of PIM-1/silica nanocomposite membranes. The changes in free volume, as well as the presence and volume of the void cavities, were investigated by analyzing the density, thermal stability, and nano-structural morphology. The enhancement in gas permeability (e.g., He, H 2 ,O 2 ,N 2 , and CO 2 ) with increasing filler content shows that the trend is related to the true silica volume and void volume fraction. Crown

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Section: Microporous Morphologymentioning

confidence: 90%

Section: Gas Permeation Properties Of Pim-1/silica Mixed-matrix Membrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gas transport behavior of mixed-matrix membranes composed of silica nanoparticles in a polymer of intrinsic microporosity (PIM-1)

Ahn

Chung

Pinnau

et al. 2010

Journal of Membrane Science

254

189

View full text Add to dashboard Cite

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“…The Maxwell principle dates back to 1873 when Maxwell defined the dielectric constant, or called permittivity, of a dielectric as the factor of proportion between the electric displacement and the electric field or potential gradient [18]. In the case of mixed matrix membranes, the gas permeation flux is proportional to the pressure difference or potential gradient and the permeability is the factor of the proportion.…”

Section: Gas Permeation In Mixed Matrix Membranesmentioning

confidence: 99%

“…Analogous to the permittivity of heterogeneous dielectrics, one can predict permeability of a mixed matrix membrane by replacing the permittivity with permeability in the continuous and dispersed phases in the equation. For a low loading of spherical fillers, the permeability, P c , of a mixed matrix membrane is described by Maxwell approximation below [18]: P m and P f are the permeability of the continuous phase and dispersed filler phase, respectively, in the mixed matrix membrane. refers the volume fraction of filler in the membrane.…”

Section: Gas Permeation In Mixed Matrix Membranesmentioning

confidence: 99%

Polymers of Intrinsic Microporosity (PIMs) Gas Separation Membranes: A mini Review

Ma¹,

Urban²

2018

Proc. Nat. Res. Soc.

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Polymers of Intrinsic Microporosity (PIMs) are broadly recognized as a potential next generation membrane material for gas separations due to their ultra-permeable characteristics. This mini review aims to provide an overview of these materials and capture its very essence, from chemistry to applications. PIMs-based gas separation membranes are divided into three main categories, i.e., neat PIMs, polymer blend PIMs, and mixed matrix PIMs membranes. This review covers a wide spectrum of PIMs with their gas diffusion mechanisms and separation performance, all of which are examined in detail. Core challenges and opportunities of PIMs membrane technology are reviewed, and this article concludes with future perspectives on PIMs. This mini review establishes a comprehensive understanding of the key technological competence and barriers of PIMs for next-generation gas separations membranes. S ignificant advances in the science and engineering of membrane materials and separation processes have been witnessed in recent decades. Membranes have demonstrated the capability of reducing the enormous amount of energy consumption for gas separations, compared to conventional thermally driven separation processes, like cryogenic distillation [1]. Indeed, membrane separation process is cost-effective and environmentally friendly with small physical footprints. Interests of membrane technology have been growing increasingly in past decades. Key areas that membranes are at play include CO 2 capture, nitrogen generation, hydrogen/helium recovery, natural gas sequestration and biogas purification [2]. Regarded as a new family of membrane materials, Polymers of Intrinsic microporosity (PIMs) have exhibited extremely high gas separation productivity and drawn extensive attention world-widely. The intrinsic microporosity leverages PIMs membranes to far exceed the Robeson upper bound limit of polymeric membranes, which opens an entirely new avenue for gas separations [3]. This review addresses the key developments and advances of PIMs as a super-permeable membrane material for gas separations. Specifically, this paper presents a comprehensive overview of three imperative types of PIMs membranes: those made from, respectively, neat PIMs, polymer blend PIMs, and mixed matrix PIMs.

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