Synthesis and characterization of polysulphone/clay membrane: effect of natural clay differences

Adams, Feyisayo Victoria; Mulaba‐Bafubiandi, Antoine F.

doi:10.1080/19443994.2015.1077347

Cited by 2 publications

(2 citation statements)

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“…The dynamics of confined water is an active field of research, since the modification of the structure and dynamics of water under confinement depends very much on the interaction of water molecules with the confining medium [7,8,[80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][281][282][283][284][285][286][287][288][289][290][291]. Their large water retention, low hydraulic conductivity, heat resistance, and ionic exchange capacities make clays ideal for many different applications in catalysis, desalination, enhanced oil recovery, and isolation barriers for radioactive waste disposal [116][117][118][119][120][121][122][123][124][125][126]. In the subsequent sections, we discuss the diffusion of water molecules in the interlayer spacing of these clay materials.…”

Section: Structure and Composition Of Various Clay Materialsmentioning

confidence: 99%

“…Depending on the amount of charge on the clay surfaces and the type of counterion between layers, the spacing can be controlled by the amount of hydration, enabling a wide range of interfaces to be created [114,115]. It is therefore unsurprising that clay materials have found applications in catalysis, desalination, enhanced oil recovery, and isolation barriers for radioactive waste disposal [116][117][118][119][120][121][122][123][124][125][126]. Since the catalytic and molecular sieving properties depend upon the diffusivity of the adsorbed molecules, a study of the dynamics of guest molecules adsorbed in zeolitic and clay materials is necessary to understand these properties.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion of confined fluids in microporous zeolites and clay materials

Mitra¹,

Sharma²,

Mukhopadhyay³

2021

Rep. Prog. Phys.

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Fluids exhibit remarkable variation in their structural and dynamic properties when they are confined at the nanoscopic scale. Various factors, including geometric restriction, the size and shape of the guest molecules, the topology of the host, and guest–host interactions, are responsible for the alterations in these properties. Due to their porous structures, aluminosilicates provide a suitable host system for studying the diffusion of sorbates in confinement. Zeolites and clays are two classes of the aluminosilicate family, comprising very ordered porous or layered structures. Zeolitic materials are important due to their high catalytic activity and molecular sieving properties. Guest molecules adsorbed by zeolites display many interesting features including unidimensional diffusion, non-isotropic rotation, preferred orientation and levitation effects, depending on the guest and host characteristics. These are useful for the separation of hydrocarbons which commonly exist as mixtures in nature. Similarly, clay materials have found application in catalysis, desalination, enhanced oil recovery, and isolation barriers used in radioactive waste disposal. It has been shown that the bonding interactions, level of hydration, interlayer spacing, and number of charge-balancing cations are the important factors that determine the nature of diffusion of water molecules in clays. Here, we present a review of the current status of the diffusion mechanisms of various adsorbed species in different microporous zeolites and clays, as investigated using quasielastic neutron scattering and classical molecular dynamics simulation techniques. It is impossible to write an exhaustive review of the subject matter, as it has been explored over several decades and involves many research topics. However, an effort is made to cover the relevant issues specific to the dynamics of different molecules in microporous zeolites and clay materials and to highlight a variety of interesting features that are important for both practical applications and fundamental aspects.

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