Graphene and boron nitride nanoplatelets for improving vapor barrier properties in epoxy nanocomposites

Damari, Sivan Peretz; Cullari, Lucas Luciano; Laredo, Dalia; Nadiv, Roey; Ruse, Efrat; Sripada, Raghu; Regev, Oren

doi:10.1016/j.porgcoat.2019.06.053

Cited by 23 publications

(16 citation statements)

References 60 publications

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“…The incorporation of nanoparticles in epoxy resins allows modification of many properties. In comparison to the neat polymer, enhanced mechanical properties [ 6 , 16 , 27 , 32 , 35 , 45 , 57 , 69 , 85 , 101 , 106 , 108 , 109 , 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 ], improved corrosion resistance [ 21 , 25 , 59 , 64 , 70 , 92 , 108 , 120 , 121 , 122 , 123 , 124 , 125 , 126 ], increased thermal and electrical conductivity [ 5 , 15 , 16 , 17 , 27 , 45 , 86 , 87 , 101 , 109 , 110 , 117 , 127 , 128 ], high dielectric permittivity and low dielectric loss [ 93 ...…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

“…Shape, size, and dispersion of the nanoparticles, more than the type of nanofiller, influence the final properties of the composite. In fact, nanoparticle aggregation is able to create defects into the matrix which may lead to micro-cracks [ 27 , 108 , 127 , 128 , 131 ]. It has been found that linearly shaped nanoparticles (e.g., CNTs) mainly produce increases in mechanical properties [ 108 ] and 2D nanosheets (such as GNP, graphene oxide, and MoS 2 ) appreciably improve the barrier properties [ 92 , 121 , 124 , 125 ], especially corrosion resistance, while spherically shaped nanofillers (e.g., fullerene), having a low capability to aggregate, yield an overall improvement in nanocomposites’ properties [ 108 , 132 ].…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

“…The effects of moist environments on the interfacial adhesion greatly depends on the nanofiller’s surface wettability [ 138 ] since hydrophobic features limit the water adsorption at the interface. Therefore, the use of hydrophobic nanofillers reduces the chemical interactions with water molecules and, in the absence of defects, lower amounts of water are absorbed and vapor barrier properties are enhanced [ 128 ]. As a consequence, the addition of nanofillers allows improvement of the stability and durability of the nanocomposite in humid environments [ 110 , 115 ].…”

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

“…The extraordinary chemical and physical properties of a wide variety of experimental nano-epoxies enable a wide range of applications, varying from coatings to structural adhesives, from FRP matrix to electrical/electronic components. Epoxy nanocomposites have found advantageous application in many industrial fields [ 59 , 120 ] such as aerospace [ 114 ], aircraft [ 119 ], automotive [ 33 , 110 ], buildings [ 18 , 67 , 145 , 146 ], electronic devices [ 17 , 86 , 99 , 128 ], sensors [ 90 , 110 , 115 , 127 , 144 ] (even for biomedical applications), anti-static materials [ 9 ], abrasive tools [ 103 ], anti-corrosive coatings (for example in marine environment [ 147 ] or pipes [ 10 ]), and structural applications [ 29 , 68 , 109 ] with self-sensing properties [ 127 ]. Often, the improved properties allow an efficient usage for multifunctional purposes [ 27 , 69 , 148 ].…”

Section: Applications Of Nanofilled/nanostructured Epoxy Resinsmentioning

confidence: 99%

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Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Frigione

Lettieri

2020

Materials

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This paper aims at reviewing the works published in the last five years (2016–2020) on polymer nanocomposites based on epoxy resins. The different nanofillers successfully added to epoxies to enhance some of their characteristics, in relation to the nature and the feature of each nanofiller, are illustrated. The organic–inorganic hybrid nanostructured epoxies are also introduced and their strong potential in many applications has been highlighted. The different methods and routes employed for the production of nanofilled/nanostructured epoxies are described. A discussion of the main properties and final performance, which comprise durability, of epoxy nanocomposites, depending on chemical nature, shape, and size of nanoparticles and on their distribution, is presented. It is also shown why an efficient uniform dispersion of the nanofillers in the epoxy matrix, along with strong interfacial interactions with the polymeric network, will guarantee the success of the application for which the nanocomposite is proposed. The mechanisms yielding to the improved properties in comparison to the neat polymer are illustrated. The most important applications in which these new materials can better exploit their uniqueness are finally presented, also evidencing the aspects that limit a wider diffusion.

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Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

Section: Properties Of the Epoxy Nanocompositesmentioning

confidence: 99%

Section: Applications Of Nanofilled/nanostructured Epoxy Resinsmentioning

confidence: 99%

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Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Frigione

Lettieri

2020

Materials

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“…The first isolation of graphene monolayers in 2004 ignited large scientific and commercial interest due to their unique thermal, electrical, optical and mechanical properties. − Applications ranging from energy storage through composite materials , to impermeable thin films − have led to increasing demand for high quality , exfoliated graphene sheets. Dispersing graphene at high concentration (>0.2 wt %) in liquids is crucial for various purposes, yet it remains a challenging task.…”

Section: Introductionmentioning

confidence: 99%

Trapped and Alone: Clay-Assisted Aqueous Graphene Dispersions

Cullari

Masiach

Damari

et al. 2021

ACS Appl. Mater. Interfaces

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Dispersing graphene sheets in liquids, in particular water, could enhance the transport properties (like thermal conductivity) of the dispersion. Yet, such dispersions are difficult to achieve since graphene sheets are prone to aggregate and subsequently precipitate due to their strong van der Waals interactions. Conventional dispersion approaches, such as surface treatment of the sheets either by surfactant adsorption or by chemical modification, may prevent aggregation. Unfortunately, surfactant-assisted graphene dispersions are typically of low concentration (<0.2 wt %) with relatively small sheets (<1 μm lateral size) while chemical modification is punished by increased defect density within the sheets. We investigate here a new approach in which the concentration of dispersed graphene in water is enhanced by the addition of a fibrous clay mineral, sepiolite. As we demonstrate, the clay particles in water form a kinetically arrested particle network within which the graphene sheets are effectively trapped. This mechanism keeps graphene sheets of high lateral size (∼4 μm) dispersed at high concentrations (∼1 wt %). We demonstrate the application of such dispersions as cooling liquids for thermal management solutions, where a 26% enhancement in the thermal conductivity is achieved as compared to that in a filler-free fluid.

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Lightweight All Graphene‐Based Two‐Phase Heat Transport Devices

Zheng

Shen

Wang

et al. 2023

Adv Materials Inter

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interactions of weak van der Waals force to form thick graphene-based film, and the films are not strong enough to withstand tensile and compression due to weak connection. [1] Past efforts in solving this problem were focused on improving the strength of graphene-based films through incorporating a polymer as a binder. [2][3][4] While this strategy has helped improve the mechanical performance of graphene-based films, it leads to the deterioration of other properties, such as thermal properties. The use of polymer binders greatly reduces the thermal conductivity of graphene-based film due to the low thermal conductivity of polymers and the high inherent interfacial thermal resistance between graphene and polymers. [5,6] To improve the thermal conductivity of graphene-based films, one effective solution is to incorporate polymers with high intrinsic thermal conductivity, [7] but the improvement is limited to a certain level.In order to generate graphene-based systems with high thermal conductivity, graphene films can be used as casing materials to prepare a two-phase heat transport device (TPHTD). Such a device mainly relies on the phase change heat transfer process and takes advantage of both the large latent heat and the fast flow of the vapor from the evaporator to the condenser to realize efficient heat transfer, thus achieving high thermal conductivity, enabling its extensive use in thermal management devices. [8][9][10] So far, graphene has been used in two different ways for the TPHTD. In one way, graphene is coated on the inner wall of the metal-based casing in the TPHTD. [11][12][13][14] While this approach improves the thermal conductivity of the TPHTD due to good-wettability and low flow resistance of working medium on the surface of graphene, the resulting device is still heavy due to the metal-based casing, which does not take advantage of the lightweight property of graphene. The other is to use graphene as the casing material and metal frame as the support to prepare TPHTDs. [15] Such an approach still has not yet been realized to lightweight all graphene-based TPHTDs. To achieve all graphene-based TPHTDs with high thermal performance, an alternative approach is needed to form reliable binding between graphene nanosheets at nanoscale and achieve desired geometry of devices at macroscale. Graphene-based composites show great potential in the development of lightweight functional devices and systems, and polymers are usually used as binders to enhance the mechanical properties of these composites. Due to the low thermal conductivity of the polymer and the high inherent interfacial thermal resistance between polymer and graphene, however, the developed devices and systems generally possess low thermal conductivity, which seriously limits their further thermal-related applications. Here, a lightweight two-phase heat transport device (TPHTD) based on a vapor-liquid phase transition-based heat transfer by using a graphene-based composite material as the casing is generated. The graphene-based TPHTD has h...

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Graphene and boron nitride nanoplatelets for improving vapor barrier properties in epoxy nanocomposites

Cited by 23 publications

References 60 publications

Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Recent Advances and Trends of Nanofilled/Nanostructured Epoxies

Trapped and Alone: Clay-Assisted Aqueous Graphene Dispersions

Lightweight All Graphene‐Based Two‐Phase Heat Transport Devices

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