Ultrathin nanosheets of MAX phases with enhanced thermal and mechanical properties in polymeric compositions: Ti3Si0.75Al 0.25C2
Date
2013
Authors
Zhang, X.
Xu, J.
Wang, H.
Zhang, J.
Yan, H.
Pan, B.
Zhou, J.
Xie, Y.
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Journal article
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Angewandte Chemie International Edition, 2013; 52(16):4361-4365
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Abstract
Since first reported, layered ternary carbides and nitrides named "MAX phases" from Mn+1AXn (n=1, 2 or 3) phases, where M is a transition metal, A is a group IIIA or IVA element, and X is carbon or nitrogen atoms, have attracted the attention of scientists and industry for their unique combination of metallic and ceramic properties.[1] For example, MAX phases show excellent resistance to oxidation, heat, and corrosion, high electrical conductivity, high strength and elastic modulus, and are easily produced, benefiting from their inherent lamellar structure with alternately arranged MX and A layers (Figure 1a).[2-4] Currently, the study and application of MAX phases is still restricted to three-dimensional (3D) bulk samples. Nanosized materials, especially ultrathin twodimensional (2D) nanosheets, show enhanced properties with respect to their corresponding bulk counterpart.[5-8] For example, free-standing graphene shows remarkable in-plane thermal conductivity and mechanical strength, up to about 3000Wm 1K 1 and 1060 GPa, respectively.[8, 9] The thermal conductivity and mechanical strength of ultrathin boron nitride (BN) nanosheets are theoretically estimated as high as 2000Wm 1K 1 and 800 GPa,[10] respectively, which are much higher than the value of the corresponding bulk materials. Benefiting from these properties, graphene and BN nanosheets are considered to be promising fillers in polymeric composites, to improve their thermal and mechanical properties.[11-15] Accordingly, we anticipate enhanced properties of ultrathin nanosheets of MAX phases with respect to the bulk materials.
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Copyright 2013 Wiley-VCH Verlag GmbH & Co.