Ordered Arrangement Of Carbon Nanotubes Driven By Evaporation Induced Self-assembly Of Nanocrystalline Cellulose

Nanocrystalline cellulose(NCC)is of a large Young’s modulus and specific surface area,and has excellent dispersing performance.It can be regarded as a nano-additive to enhance the mechanical strength of composite materials.Recently,the self-assembled behavior of NCC has been paid significant attention: evaporation would induce NCC to produce unique self-assembly,forming a specific chiral nematic structure and producing unique optical phenomenon of selective reflection.The cellulose material of chiral nematic structure is an excellent optical material,which can also be regarded as a template to prepare other optical materials.The dispersion and ordered arrangement of carbon nanotubes(CNTs)are the important researches in material preparation.The dispersing performance of NCC has been used to prepare NCC-CNTs composite dispersion,which is evaporated to fabricate the chiral nematic structure of NCC that induces the ordered arrangement of CNTs.Based on the preparation of NCC-CNTs composite films,CNTs doped carbon materials are produced under calcination.The thesis includes the following contents:(1)The ordered arrangement of CNTs driven by self-assembly of NCC with evaporationNCC rods are prepared by an approach of sulphuricacid hydrolysis,and then NCC is used to disperse single-walled CNTs,resulting in NCC-CNTs composite dispersions.At ambient temperature,NCC-CNTs composite films are prepared through slow evaporation of the composite dispersions.Both the composite dispersions and films were characterized with polarizing optical microscopy(POM),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD),atomic force microscopy(AFM).The ordered arrangement of CNTs is detected with ohmmeter,TEM,AFM,etc.It is shown that the self-assembly of NCC does not be influenced by the addition of CNTs,and CNTs can be sequestrated in the NCC helixes,which is responsible for a erect and parallel CNTs alignment.(2)The preparation and characterization of ordered mesoporous carbon materials doped by carbon nanotubesOn the basis of nanocrystalline cellulose-carbon nanotubes composite film,silica-nanocrystalline cellulose-carbon nanotube composite film is prepared by ethyl orthosilicate hydrolytic,then dealed with the methods of calcination and alkali etching processing,respectively.Subsequently the ordered mesoporous carbon materials are born.The microstructure characterization of carbon materials show that it keeps its chiral nematic phase spiral arrangement,owing large specific surface area.And its electrochemical properties tests show a good charge transfer behavior,excellent capacitance behavior and low impedance.