Effect of nanoclay orientation on oxygen barrier properties of LbL nanocomposite coated films

Dhieb, Fatma Ben; Dil, Ebrahim Jalali; Tabatabaei, Seyyed H.; Mighri, Frej; Ajji, Abdellah

doi:10.1039/c8ra09522a

Cited by 29 publications

(23 citation statements)

References 64 publications

(80 reference statements)

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“…In addition, the oxygen and hydroxyl groups on the NC‐LAP surface can establish hydrogen bonds with MPD, and thus, more MPD can be adsorbed onto the particle surface for reaction with TMC. [ 44 ] Furthermore, PEG200 trapped in the clay interlayer can react with TMC to form poly(ether ester)s, [ 45 ] which may also contribute to the increase in selective‐layer thickness.…”

Section: Resultsmentioning

confidence: 99%

“…However, with further increase in NC‐LAP loading to 0.4 wt%, an abrupt drop in salt rejection is observed possibly due to the formation of defects at higher NC‐LAP loadings. In other words, since NC‐LAP are coated and attached onto the PSf surface through van der Waals interactions and its particle size can swell up by sorbing water molecules in the aqueous solution, [ 44,48 ] this may induce voids among particles. [ 49 ] For thinner NC‐LAP layers, the grown polyamide during the thin‐film polymerization could penetrate the NC‐LAP layers and anchor the nanoclays onto the substrate and polyamide through hydrogen bond interactions.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Zhao

Chung

2020

Adv Materials Inter

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produce a TFC membrane with both high water permeability and salt rejection as there is a trade-off relationship between them. [5,6,[11][12][13] Up to now, various methods, such as monomer alteration, [14][15][16] surface modification, [17,18] and posttreatment, [19] have been attempted to improve the membrane performance.The rapid progress in nanomaterials has brought new possibilities to break through the bottleneck. Thin-film nanocomposite (TFN) membranes, a new type of nanotechnology-enhanced membranes, are studied as a promising candidate for desalination purposes. [5,6,[20][21][22] Many nanoparticles, such as zeolites, [6,[23][24][25] silica, [26,27] metal-organic frameworks− covalent-organic frameworks (MOFs− COFs), [28][29][30] carbon nanotubes, [31,32] and carbon−graphene oxide quantum dots, [33][34][35] have been incorporated into the polyamide matrix of TFN membranes to increase membrane hydrophilicity and provide additional water pathways. [36] Nevertheless, most of the nanoparticles used are produced in laboratory scale and the yield is relatively low, which is difficult to scale up for commercialization when taking economic viability into account.Of the nanomaterials available in the market, nanoclays of abundant sources from nature are potential to be the nanofillers in TFN membranes. [37] Ghanbari et al. incorporated halloysite nanotubes into polyamide layers for brackish water desalination. [38] Dong et al. used montmorillonite as nanofillers to enhance fouling resistance. [39] Hebbar et al. utilized functionalized bentonite to improve nanofiltration performance in removal of heavy metals and humic acids. [40] However, most of the nanoclays reported have relatively low dispersity in solvents, which have to undergo long-time activation or complicated surface modifications prior to be dispersed in water or organic solvents. [38][39][40] Laponite (Na +0.7 [Si 8 Mg 5.5 Li 0.3 O 20 (OH) 4 ] 0.7− ) nanoclays (NC-LAP), a type of synthetic nanoclays, have been discovered and commercialized for decades, and commonly used as a film-forming agent, emulsifier, and gelling agent. [41,42] Owing to its excellent aqueous dispersity, small size and nontoxicity, Laponite can be a good candidate as nanofillers in TFN membranes, which requires no complicated pretreatment when being blended with the aqueous monomer solution for interfacial polymerization.Herein, new TFN membranes with incorporation of commercialized Laponite nanoclays were fabricated via conventional interfacial polymerization (illustrated in Figure 1). The influence of nanoclays on membrane morphology and separation A series of thin-film nanocomposite (TFN) membranes with incorporation of Laponite nanoclays (NC-LAP) is prepared and demonstrated for brackish water and seawater desalination. It is the first attempt to use poly(ethylene glycol) 200 (PEG200) assisted Laponite as nanofillers to improve the performance of TFN membranes for reverse osmosis (RO) seawater desalination. The influence of NC-LAP loading and PEG200 as the dispersant on membrane ...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Zhao

Chung

2020

Adv Materials Inter

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“…However, PP is a hydrophobic polymer with poor oxygen barrier properties and low affinity with hydrophilic fillers. Cellulose nanofibers (CNF) and nano-sized clays are well known for their hydrophilic fillers that improve polymers’ mechanical strength and oxygen barrier properties [ 4 , 5 , 6 , 7 , 8 ]. CNFs are produced by a variety of materials, such as bleached wood pulp and cotton linters, and exhibit a great performance even with low composite content [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Cellulose Nanofiber and Nanoclay as Distributed Phase in a Polypropylene Based Nanocomposite System

Jung

Kang

et al. 2020

Polymers

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Since the plastic-based multilayer films applied to food packaging are not recyclable, it is necessary to develop easily recyclable single materials. Herein, polypropylene (PP)-based cellulose nanofiber (CNF)/nanoclay nanocomposites were prepared by melt-mixing using a fixed CNF content of 1 wt %, while the nanoclay content varied from 1 to 5 wt %. The optimum nanoclay content in the PP matrix was found to be 3 wt % (PCN3), while they exhibited synergistic effects as a nucleating agent. PCN3 exhibited the best mechanical properties, and the tensile and flexural moduli were improved by 51% and 26%, respectively, compared to PP. In addition, the oxygen permeability was reduced by 28%, while maintaining the excellent water vapor permeability of PP. The improvement in the mechanical and barrier properties of PP through the production of PP/CNF/nanoclay hybrid nanocomposites suggested their possible application in the field of food packaging.

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“…These coatings have also a better barrier owing to the important fraction of clay that can be achieved. New techniques such as layer-by-layer (LbL) have succeeded in depositing thin nanocomposite coatings with good orientation, 12 dispersion, and intercalation of clay platelets. This methodconsists in the successive deposition of thin layers (polymers and/or nanofiller) on a substrate with numerous types of interlayer interactions to hold these layers together (electrostatic interactions, hydrogen bonding, etc.).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Crosslinking Efficiency in Dip and Roll-Deposited Coatings on Their Oxygen Barrier

et al. 2019

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Coating techniques are key factors in determining coated film properties. In the present study, nanocomposite coatings of poly(vinyl alcohol) and a nanoclay, montmorillonite, were deposited layer-by-layer using roll (doctor blade, DB) and dip coating techniques, in an effort to compare the impact of these techniques on the crosslinking efficiency and oxygen barrier of the coated films. The barrier properties at different relative humidities were tested, and the extent of nanoclay intercalation as well as the films’ morphology was investigated. Barrier was further improved by crosslinking the coating with glyoxal and glutaraldehyde. Both techniques gave similar results but with a higher impact of relative humidity in roll coated films. Better results were achieved by tailoring the composition of those coatings to favor a higher density of hydrogen bonding in the coating.

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Effect of nanoclay orientation on oxygen barrier properties of LbL nanocomposite coated films

Abstract: Quantify clay orientation in a layer by layer deposited films. Demonstrate the importance of interfacial region in a high clay loading nanocomposite film, in decreasing permeability.

Cited by 29 publications

References 64 publications

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Nanoclays‐Incorporated Thin‐Film Nanocomposite Membranes for Reverse Osmosis Desalination

Synergistic Effect of Cellulose Nanofiber and Nanoclay as Distributed Phase in a Polypropylene Based Nanocomposite System

Comparison of Crosslinking Efficiency in Dip and Roll-Deposited Coatings on Their Oxygen Barrier

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