Freestanding α-zirconium phosphate based nacre-like composite films cast from water

Smith, Andrew J.; Wan, Chaoying; Figiel, Łukasz; Farris, Stefano; McNally, Tony

doi:10.1016/j.compscitech.2020.108443

Cited by 8 publications

(11 citation statements)

References 53 publications

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“…Hence, such high mechanical strength and stiffness of 15P@G‐PVA/3G arise from synergistic effects of strong interfacial H‐bonding interactions and the hierarchical nacre‐like structure where GNPs nanosheets are highly aligned parallelly in the tensile direction. [ 62–66 ] The synergies facilitate the longitudinal interfacial stress transfer from mechanically weak PVA to mechanically strong and stiff GNPs nanolayers, [ 59,67 ] thus leading to high mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

Scalable, Robust, Low‐Cost, and Highly Thermally Conductive Anisotropic Nanocomposite Films for Safe and Efficient Thermal Management

Chen

Wang

et al. 2021

Adv Funct Materials

105

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Recently, soaring developments in microelectronics raise an urgent demand for thermal management materials to tackle their “overheating” concerns. Polymer nanocomposites are promising candidates but often suffer from their inability of mass production, high‐cost, poor mechanical robustness, and even flammability. Hence, it is desirable to scalably fabricate low‐cost, robust polymeric nanocomposites that are highly thermally conductive and fire‐retardant to ensure safe and efficient thermal management. Herein, the scalable production of nacre‐like anisotropic nanocomposite films using the layer‐by‐layer assembly of phenylphosphonic acid@graphene nanoplatelets (PPA@GNPs)‐poly(vinyl alcohol) (PVA) layer and GNPs layers, is demonstrated. The PPA serves as interfacial modifiers and fire retardants for flammable PVA (film‐forming agent) and GNPs (inexpensive conductive nanofillers) via hydrogen‐bonding and π–π stacking. The resultant nanocomposite exhibits a high flexibility, high tensile strength of 259 MPa, and an ultrahigh in‐plane thermal conductivity of 82.4 W m‐1 K‐1, making it effectively cool smartphone and high‐power light emitting diode modules, outperforming commercial tinfoil counterparts. Moreover, the as‐designed nanocomposites are intrinsically fire‐retardant and can shield electromagnetic interference. This work offers a general strategy for mass production of thermally conductive nanocomposites holding great promise as thermal management materials in electronic, military, and aerospace fields.

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Section: Resultsmentioning

confidence: 99%

Scalable, Robust, Low‐Cost, and Highly Thermally Conductive Anisotropic Nanocomposite Films for Safe and Efficient Thermal Management

Chen

Wang

et al. 2021

Adv Funct Materials

105

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“…The XRD spectrum of the nanosheets is shown in Figure f. The synthesized α-ZrP nanosheets mainly contain characteristic peaks at 11.6°, 19.8°, 25.0°, and 25.3°, corresponding to (002), (110), (112), and (204̅) crystal planes, respectively, indicating that α-ZrP nanosheets have good crystallinity . For α-ZrP/M and α-ZrP/M + nanosheets, a very obvious characteristic peak of (002) crystal plane appears at 11.6°, and the corresponding interplanar crystal spacing is 0.76 nm, indicating that M600 has effectively been exfoliated α-ZrP into single-layer nanosheets.…”

Section: Results and Discussionmentioning

confidence: 99%

“…α-ZrP nanosheets have the advantages of good chemical and thermal stability, appropriate mechanical strength, high specific surface area, and insoluble in water and organic solvents. − There are many active sites on its surface, which will produce strong interface effects when mixed with polymers. − Han et al prepared an α-ZrP nanosheet by a hydrothermal reaction and then assembled positively charged poly(dimethyl diallyl ammonium chloride), negatively charged α-ZrP, and poly(acrylic acid) into polyethylene terephthalate film through electrostatic interaction, which greatly reduced the oxygen transmission rate. Ding and his colleagues incorporated α-ZrP and GO nanofillers into poly(vinyl alcohol) (PVA) to improve the strength and barrier properties of PVA nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Orientation of Ultrathin α-ZrP Nanosheets in Aqueous Epoxy Resin for Anticorrosive Coatings

Zhu

Yan

et al. 2021

ACS Appl. Nano Mater.

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Two-dimensional layered materials have attracted wide attention owing to their many desirable properties. In particular, its outstanding barrier properties can effectively improve the impermeability of organic polymer coatings. However, the barrier properties of the coating depend to a large extent on the dispersion and orientation of the nanosheets in the coating. Here, monoamine-capped poly(etheramine) is inserted into the synthesized α-zirconium phosphate (α-ZrP) to obtain water-dispersible nanosheets with regular shapes and controllable thicknesses. In addition, the effects of the orientation (random and parallel) of α-ZrP nanosheets on the permeability and corrosion resistance of waterborne epoxy coatings have been systematically studied, and the results are in good agreement with the theoretical model. Compared with the pure coating, the impedance of the coating with high aspect ratio nanosheets and the coating with high aspect ratio nanosheets arranged in parallel increased by 83.5 and 221.7 times, respectively, after immersion for 60 days. This provides a strategy and theoretical basis for the two-dimensional nanosheet to improve the long-term service of anticorrosion coatings.

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“…The assembled hybrids containing α-ZrP nanosheets exhibited greatly improved mechanical properties. [88,100,[116][117][118] Boo et al [88] mixed α-ZrP nanosheets with epoxy monomers. After curing, the assembled hybrid possessed simultaneously improved mechanical strength, stiffness, and toughness compared to the neat epoxy, which has rarely been achieved, thanks to the excellent mechanical properties of α-ZrP nanosheets and their uniform dispersion and rough…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Assembly of exfoliated α‐zirconium phosphate nanosheets: Mechanisms and versatile applications

et al. 2022

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α-Zirconium phosphate (Zr(HPO 4 ) 2 ⋅H 2 O, α-ZrP) is an inorganic layered compound. Since the first report of crystalline α-ZrP in 1964, thanks to its simple synthesis and unique physiochemical properties, α-ZrP has found widespread application in many fields including mechanical reinforcing, barrier improvement, flame retardancy, anticorrosion, catalysis, environment, energy, and medicine. Because of the ease of exfoliation of α-ZrP to obtain single-layer nanosheets, as well as its rich surface chemistry thanks to the high density of orderly arranged surface acidic hydroxyl groups, α-ZrP single-layer nanosheets are ideal building blocks for self-assembly or assembly with other chemicals. The assembly of α-ZrP nanosheets could form a randomly dispersed structure (isotropic), roughly ordered structure (nematic), or highly ordered structure (smectic) within liquid colloids or solid hybrids (including hydrogels). Thanks to the combination of the unique structures and the novel functions of the components, the assembled materials have found a wide verity of applications due to their excellent properties. In this article, the methods to synthesize α-ZrP, the approaches and mechanisms to exfoliate α-ZrP, and the strategies to assemble α-ZrP nanosheets to form various structures, as well as the applications of the assembled materials are reviewed. The emerging prospects of α-ZrP nanosheets as a key material in next-generation functional applications are envisioned.

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Freestanding α-zirconium phosphate based nacre-like composite films cast from water

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 8 publications

References 53 publications

Scalable, Robust, Low‐Cost, and Highly Thermally Conductive Anisotropic Nanocomposite Films for Safe and Efficient Thermal Management

Scalable, Robust, Low‐Cost, and Highly Thermally Conductive Anisotropic Nanocomposite Films for Safe and Efficient Thermal Management

Orientation of Ultrathin α-ZrP Nanosheets in Aqueous Epoxy Resin for Anticorrosive Coatings

Assembly of exfoliated α‐zirconium phosphate nanosheets: Mechanisms and versatile applications

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