nature shellfish, bones and teeth, both excellent strength and toughness. Numerous studies indicate that these biological material to obtain excellent mechanical properties mainly due to organic and inorganic nanoparticles anisotropy organic – forming highly ordered layered microstructure inorganic hybrid. Inspired by the above-described biological structure, including the preparation process layer assembly, vacuum filtration, etc. microstructure regulation layered nanocomposites. However, these methods are still some drawbacks, on the one hand, large-scale preparation of a composite long-range orientational structure can not be achieved. On the other hand, multi-component nanomaterials for enhanced system, can not avoid the problem of nano materials in the preparation process reunion, reunion and nanomaterials will directly affect its overall performance. Thus far, large-scale continuous layered structure of Making Nanocomposites remains a major problem.
Second, the research results
Recently, Beijing University of Aeronautics and Astronautics Professor Liu Mingjie Task Force the use of flow-induced shear large aspect ratio the two-dimensional sheet is oriented in its direction of flow are arranged, the method having a highly ordered layered nanocomposites continuous batch prepared. For example, the tensile strength of the nanocomposites based on clays and nano-graphene oxide sheets up display 1215 ± 80 MPa, a Young\’s modulus of 198.8 ± 6.5 GPa. Further, by adding carbon nanotubes using spread prepared by ultra high toughness nanoclay group (SS- clay / CNT) reaches the toughness of nanocomposite films 36.7 ± 3.0 MJ / m 3 [ 123], a 20.4 times the natural nacre, while the tensile strength of up to 1195 ± 60 MPa. GO large aspect ratio of the nano-sheet to have better stress transfer and higher cohesive strength, well-dispersed carbon nanotubes can be enhanced by adjacent nano sheet and the mechanical properties of the bridging polymer matrix further improve the mechanical properties . The work \”Layered nanocomposites by shear-flow-induced alignment of nanosheets\” was published in top international academic journals Nature 123] on [. III. Highlights herein:
to provide a shearing of the hydrogel / oil interface – Rheology induced two-dimensional arrangement of sheets, preparation of highly ordered quantities layered nanocomposites.
Method spreading over the paper can be easily extended to other two-dimensional packing, and provide a reference nanocomposite super layered structure prepared in bulk.
Fourth, the research results discussed ideas and specific
Preparation and Mechanism layered nanocomposite films
) diffuse from the hydrogel over the surface of the diffusion layer and the NaAlg crosslinking occurs, the GO nanosheet fixed to calcium alginate (CA), thereby forming a hydrogel CA composite film. The hydrogel film is then immersed in a water bath prepared, and dried, to obtain a continuous and uniform excellent in GO / CA nanocomposite films.
3 , is 20.4 times that of natural nacre, while the tensile strength of up to 1195 ± 60 MPa . under high stress, the critical interface can effectively prevent the formation and propagation of cracks. Furthermore, prepared to give OF SS-GO / clay / CNT Nanocomposite Films by simply laminate method used to prepare bulk artificial pearls (4 cm × 4 cm × 0.2 cm). In the same impact force, naturally Yi Beizhen layer of beads broke into pieces, and artificial pearls SS-GO / clay / CNT nanocomposite film formation occurs only certain indentation depth and not broken. V. Study Summary
The method of spreading a solution of ultra-induced shear flow based on the combination of highly ordered layered structure composite membrane, the composite layered structure solves not large continuous preparation problem area, and thus more polymer derived directly filler and a method of manufacturing a layered nanocomposite films 2D nm. This work has great potential for mass production and application of high strength films. The full text link: