Super Gas Barrier of Transparent Polymer−Clay Multilayer Ultrathin Films

Priolo, Morgan A.; Gamboa, Daniel; Holder, Kevin M.; Grunlan, Jaime C.

doi:10.1021/nl103047k

Cited by 306 publications

(347 citation statements)

References 40 publications

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“…Therefore, the intensity ratio of I D /I G provides direct evidence of the degree of functionalization [21,22]. pect-ratio of graphene multilayers can maximize the diffusion length of gaseous molecules through the composites; in what is called a "tortuous path" [23,24]. Therefore, PI composites with rGO and rAPGO should exhibit lower OTR values than that of pure PI due to the barrier effect of the graphene film on the PI surface.…”

Section: Preparation Of Apgomentioning

confidence: 99%

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Kim¹,

Park²,

Lee³

et al. 2013

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123

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In this study, we present a facile method of fabricating graphene oxide (GO) films on the surface of polyimide (PI) via layer-by-layer (LBL) assembly of charged GO. The positively charged amino-phenyl functionalized GO (APGO) is alternatively complexed with the negatively charged GO through an electrostatic LBL assembly process. Furthermore, we investigated the water vapor transmission rate and oxygen transmission rate of the prepared (reduced GO [rGO]/rAPGO) 10 deposited PI film (rGO/rAPGO/PI) and pure PI film. The water vapor transmission rate of the GO and APGO-coated PI composite film was increased due to the intrinsically hydrophilic property of the charged composite films. However, the oxygen transmission rate was decreased from 220 to 78 cm 3 /m 2 ·day·atm, due to the barrier effect of the graphene films on the PI surface. Since the proposed method allows for large-scale production of graphene films, it is considered to have potential for utilization in various applications.

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Section: Preparation Of Apgomentioning

confidence: 99%

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Kim¹,

Park²,

Lee³

et al. 2013

Carbon letters

123

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“…7 LbL assembly is capable of fabricating polymer nanocomposites with exceptionally high contents of welldispersed nano-reinforcement (approximately 50-70 volume %), and with correspondingly high stiffness (tensile moduli as high as 15.7 to 125 GPa). [6][7][8][9][10] The total thickness of an LbL assembled film is determined by the number of times an alternating deposition cycle of anionic and cationic species is repeated, 11,12 but the nano-to microscale thickness per deposition cycle typical for LbL assembly is a major limitation of the technique and an impediment to utilizing the resulting materials for macroscale applications. 13 LbL assembly of conformal coatings onto three-dimensional porous templates, such as foams, colloidal crystals, and hollow tubes has been implemented for a variety of applications, [14][15][16][17][18][19] but these studies have largely focused on modifying the surfaces of these materials rather than altering the porous structure and bulk mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Porous Materials with Tunable Structure and Mechanical Properties via Templated Layer-by-Layer Assembly

Ziminska

Dunne

Hamilton

2016

ACS Appl. Mater. Interfaces

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The deposition of stiff and strong coatings onto porous templates offers a novel strategy for fabricating macroscale materials with controlled architectures at the micro-and nanoscale. Here, layer-by-layer assembly is utilized to fabricate nanocomposite-coated foams with highly customizable properties by depositing polymer−nanoclay coatings onto open-cell foam templates. The compressive mechanical behavior of these materials evolves in a predictable manner that is qualitatively captured by scaling laws for the mechanical properties of cellular materials. The observed and predicted properties span a remarkable range of density-stiffness space, extending from regions of very soft elastomer foams to very stiff, lightweight honeycomb and lattice materials.

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“…9 Nanoplatelets of smectite family clays such as montmorillonite (MMT), which have a high aspect ratio and a high in-plane elastic modulus, can be included within LbL films at a much higher percentage than their clay-polymer bulk counterparts, resulting in ultrathin LbL assemblies with exceptional mechanical 8 and fire retardant/oxygen barrier properties. 10,11 However, the response properties of nanocomposite LbL constructs, which are central to the biomedical applications of these materials, have remained largely unexplored. We have recently reported on highly swollen, hydrogellike nanocomposite LbL films composed of neutral, temperatureresponsive polymer and MMT nanoplatelets.…”

Section: Introductionmentioning

confidence: 99%

Small-molecule-hosting nanocomposite films with multiple bacteria-triggered responses

et al. 2014

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We report pH/bacteria-responsive nanocomposite coatings with multiple mechanisms of antibacterial protection that include the permanent retention of antimicrobials, bacteria-triggered release of antibiotics and bacteria-induced film swelling. A novel small-molecule-hosting film was constructed using layer-by-layer deposition of montmorillonite (MMT) clay nanoplatelets and polyacrylic acid (PAA) components, both of which carry a negative charge at neutral pH. The films were highly swollen in water, and they exhibited major changes in swelling as a function of pH. Under physiologic conditions (pH 7.5, 0.2 M NaCl), hydrogel-like MMT/PAA films took up and sequestered B45% of the dry film matrix mass of the antibiotic gentamicin, causing dramatic film deswelling. Gentamicin remained sequestrated within the films for months under physiologic conditions and therefore did not contribute to the development of antibiotic resistance. When challenged with bacteria (Staphylococcus aureus, Staphylococcus epidermidis or Escherichia coli), the coatings released PAA-bound gentamicin because of bacteria-induced acidification of the immediate environment, whereas gentamicin adsorbed to MMT nanoplatelets remained bound within the coating, affording sustained antibacterial protection. Moreover, an increase in film swelling after gentamicin release further hindered bacterial adhesion. These multiple bacteria-triggered responses, together with nontoxicity to tissue cells, make these coatings promising candidates for protecting biomaterial implants and devices against bacterial colonization. INTRODUCTIONPolymer nanocomposites uniquely combine the properties of inorganic and organic components that is central to the development of novel advanced materials. The naturally occurring smectite clays, which are chemically and thermally stable and biocompatible, are attractive nanocomposites. Exfoliated clay nanoplatelets strongly impact the mechanical, transport, optical, fire retardant and gas barrier properties of nanocomposite materials. 1,2 For many biomedical applications, however, hydrophilic rather than hydrophobic nanocomposites are of great interest, and responsive properties are essential. 3 Reports on responsive hydrophilic nanocomposites are rare, and those few known to us advantageously use the complementary properties of temperature/pH-responsive polymers and clay nanosheets to yield environmentally controlled free-standing materials. 4 A promising way to leverage the favorable properties of hydrophilic-responsive nanocomposites on surfaces is to use the layer-by-layer (LbL) technique to construct 'smart' surface coatings. 5 To construct clay-containing LbL films, electrostatic interactions of positively charged polymers with negatively charged basal planes of silicate nanosheets, 6,7 neutral polymer/nanoplatelet hydrogen bonding 8 or a combination of the two have been explored. 9

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Super Gas Barrier of Transparent Polymer−Clay Multilayer Ultrathin Films

Cited by 306 publications

References 40 publications

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Layer-by-layer assembled graphene oxide films and barrier properties of thermally reduced graphene oxide membranes

Porous Materials with Tunable Structure and Mechanical Properties via Templated Layer-by-Layer Assembly

Small-molecule-hosting nanocomposite films with multiple bacteria-triggered responses

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