Microstructural study of aromatic polyamide membrane material

Dutta, Dhanadeep; Bhattacharyya, Amitabha; Ganguly, Bichitra Nandi

doi:10.1016/j.memsci.2003.08.001

Cited by 41 publications

(21 citation statements)

References 7 publications

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“…The surface images were obtained via field emission scanning electron microscopy (FESEM). The FESEM and TEM images in panels (a), (b), and (c) demonstrate that the PA layer of the base TFC membrane possesses a ridge-and-valleys morphology with multiple internal nano- and microvoids 47 , 48 . In contrast to the homogeneous surface feature of the base TFC membrane, the FESEM image of TFN4 membrane obtained using back-scattered electron detector (BSE) in panel (d) reveals the formation of multiple large islands at the membrane surface.…”

Section: Resultsmentioning

confidence: 99%

Robust fabrication of thin film polyamide-TiO2 nanocomposite membranes with enhanced thermal stability and anti-biofouling propensity

Khorshidi

Biswas

Ghosh

et al. 2018

Sci Rep

138

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The development of nano-enabled composite materials has led to a paradigm shift in the manufacture of high-performance nanocomposite membranes with enhanced permeation, thermo-mechanical, and antibacterial properties. The major challenges to the successful incorporation of nanoparticles (NPs) to polymer films are the severe aggregation of the NPs and the weak compatibility of NPs with polymers. These two phenomena lead to the formation of non-selective voids at the interface of the polymer and NPs, which adversely affect the separation performance of the membrane. To overcome these challenges, we have developed a new method for the fabrication of robust TFN reverse osmosis membranes. This approach relies on the simultaneous synthesis and surface functionalization of TiO2 NPs in an organic solvent (heptane) via biphasic solvothermal reaction. The resulting stable suspension of the TiO2 NPs in heptane was then utilized in the interfacial (in-situ) polymerization reaction where the NPs were entrapped within the matrix of the polyamide (PA) membrane. TiO2 NPs of 10 nm were effectively incorporated into the thin PA layer and improved the thermal stability and anti-biofouling properties of the resulting TFN membranes. These features make our synthesized membranes potential candidates for applications where the treatment of high-temperature streams containing biomaterials is desirable.

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Section: Resultsmentioning

confidence: 99%

Robust fabrication of thin film polyamide-TiO2 nanocomposite membranes with enhanced thermal stability and anti-biofouling propensity

Khorshidi

Biswas

Ghosh

et al. 2018

Sci Rep

138

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“…In a PALS experiment, the effect of the sample on the rate of o-Ps pick-off annihilation is studied to estimate the size of the pores in the sample. Detailed methodology for the pore size analysis using PALS technique given elsewhere [10]. The liberated photons mostly come out from open spaces such as holes or voids.…”

Section: Pals Studymentioning

confidence: 99%

“…Therefore the measurements depend on the measuring temperature and pressure, degree of crystallinity and sample aging. The intensity I is a measure of number density of the network pores, which are the inter-and intra-chain spacing of the polymer that can be varied as monomers concentration changes [10]. In the present case, the obtained values of p and I are similar to the ones obtained earlier in the case commercial FT-30 of FilmTecCorp [25], which are also produced through interfacial polymerization of m-phenylenediamine in the aqueous phase and trimesoyl chloride in the organic phase.…”

Section: Pals Studymentioning

confidence: 99%

“…However, in the presence of matter, o-Ps can seek out an electron of opposite spin from the pore surface and annihilate through two-photon mode known as pickoff annihilation within the time range ∼1-10 ns. This component of positron lifetime has paramount importance, because it enables its use as nano-probe to study the microstructural properties of porous material [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of water sorbed in reverse osmosis polyamide membrane

Sharma

Singh

Gautam

et al. 2009

Journal of Membrane Science

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“…With increasing thickness, the fraction of void spaces decreases and leads to the observed decrease in water permeability and decrease in permselectivity. Second, many of the current measurements used to study nanomembranes used in reverse osmosis are done in the dry state. Yet these membranes operate in the hydrated state.…”

Section: Introductionmentioning

confidence: 99%

Thickness‐dependent swelling of molecular layer‐by‐layer polyamide nanomembranes

Chan

Lee

2017

J Polym Sci B Polym Phys

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The thickness‐dependent water vapor swelling of molecular layer‐by‐layer polyamide films is studied via specular X‐ray reflectivity. The maximum swelling ratio of these ultrathin films scale inversely with thickness but more importantly show a dual‐mode sorption behavior characterized by Langmuir‐like sorption at low relative humidity and network swelling at high relative humidity. The thickness‐dependent network parameters are extracted using a proposed model that builds on Painter‐Shenoy network swelling model while taking into account the glass‐like characteristic below a critical swelling ratio, which also scales inversely with thickness. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 412–417

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Microstructural study of aromatic polyamide membrane material

Cited by 41 publications

References 7 publications

Robust fabrication of thin film polyamide-TiO2 nanocomposite membranes with enhanced thermal stability and anti-biofouling propensity

Robust fabrication of thin film polyamide-TiO2 nanocomposite membranes with enhanced thermal stability and anti-biofouling propensity

Dynamics of water sorbed in reverse osmosis polyamide membrane

Thickness‐dependent swelling of molecular layer‐by‐layer polyamide nanomembranes

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