Nanocomposites are composite materials with nanoscale structures. This structure may be related to particle size, filler size, aperture size, etc. The size of the small hole helps to increase the mechanical strength of the porous material. Small grain sizes are attractive because they improve the yield strength of metals and the high toughness of ceramics. A small filler size provides a large filler-matrix interface area per unit volume. Large areas can be favorable or unfavourable, depending on the type of property. For example, due to the mechanical weakness of the interface, it can lead to low strength of composites (although the strength of a single nanoscale fiber unit may be high, for example, a single nanoscale fiber cell) and may also result in the high resistivity of the composite (although the resistivity of a single nanofiber unit may be low, for example, the strength of a single nanofiber unit), due to the resistance associated with the interface. On the other hand, a high interface area may be beneficial to the performance of electrochemical electrodes, as in fact, the interface between the electrode and the electrolyte is electrochemically chemicalreaction, and in batteries, it may also be beneficial to shield the conductivity (emi) of the near-surface area of the filler unit due to the skin effect (high-frequency electromagnetic radiation can only penetrate the near-surface area of the conductor). Therefore, nanocomposites are not necessarily superior to conventional composites.
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