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Sheet mesoporous materials prepared in the template synthesis of nanostructures

Author: YangHaiFeng
Tutor: ZhaoDongYuan
School: Fudan University
Course: Inorganic Chemistry
Keywords: Mesoporous materials Nanostructures A single piece of material Hard template Step synthesis method Polymer nanostructures Electrodeposition Solvothermal Density functional theory
CLC: TB383
Type: PhD thesis
Year: 2004
Downloads: 1100
Quote: 2
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Abstract


The mesoporous materials plays an increasingly important role in in nanodevices building process. Using tunable pore size of the mesoporous material bore as a nanoreactor, nanoparticles or nanowires of uniform size can be obtained as a basic structural unit; height of mesoporous materials with a uniform and long-range ordered pore structure, given the presence of one of the structural units corresponding cycle ; mesoporous materials with rich macro-morphology, to meet different application needs. The topic of this thesis is based on this use of mesoporous materials synthesis, the concept of the assembled nanostructures synthesis to limit the space for research. First synthesized mesoporous silica monolithic material, and then explore the processes involved in the synthesis of such special template material, to examine different composition of nanomaterials template preparation, try a different synthesis methods, content involved in the synthesis and characterization of mesoporous materials, nano Synthesis and Characterization of the structure, the theoretical study of the synthesis mechanism, as well as received material light, electricity, the catalytic properties of the initial exploration. Second proposed the an inert media paraffin protection fast evaporation method to prepare large size, crack-free, optically transparent Ordered structure silica monolithic material, can be as long as several months synthesis cycle reduce to 8 hours. With this approach, we synthesized at 90 ℃ obtained mesoporous pore structure having a highly ordered cubic phase (Ia3d and Im3m) silicon oxide monolithic material. The third chapter of the thesis, the chosen the large size referrals structure silica monolithic material templates, a step synthesis method, direct synthesis of metal oxide nanocrystals highly ordered mesoporous silica monolithic material is double-teamed in the pore. Get a total of 10 kinds of metal oxide Cr 2 O 3 MnO, Fe 2 O 3 , Co < sub> 3 O 4 , NiO, CuO, ZnO, CdO, SnO 2 and In , 2 O < / sub> nanocrystals. These nanocrystalline particle size of from about 5 to about 8 nm, to the rod-like or linear structure is stably present in the mesopores of the silicon oxide. Step nano-pouring method, highly ordered In 2 O 3 single crystal nanowire arrays. The this material diameter of about 7 nm In 2 O 3 single crystal nanowires with bicontinuous cubic or hexagonal pore structure for the skeleton. In Chapter IV, step synthetic route, different metal sulfides doped silicon oxide / block copolymer is prepared Ordered structure monolithic material. The optical properties of the material by changing the doping component (ZnS, Co 8 , MnS, NIS, of CdS, SnS, Sb in S 9 2 S 3 and In 2 S 3 ), changes in the doping amount of the same component or a change in the stoichiometric ternary compound of two metals ratio of effective regulation. The highly ordered referral concept structure SiO 2 / CdO nanocomposite precursor source of selenium or sulfur source is present under reducing conditions, the use of in situ hydrothermal reaction mesoscopic the structure SiO 2 / of CdSe and SiO 2 / CdS nanocomposites remove the SiO 2 , diameter of about 8 nm CdS and CdSe spherical hexagonal phase nanocrystals. Chapter 5, the proposed one-step synthesis of a polymer nano-structure, access to the reported minimum polystyrene and polyacrylic acid nanoparticles having a diameter between 2 to 4 nm, having a spherical morphology and more uniform particle size. Polyacrylic acid to synthesize nano-particles as a template, the two semiconductor metal sulfide (CdS and ZnS) / polypropylene Fudan the doctoral thesis Yang Haifeng acid core-shell nanoparticles were prepared, the diameter of the particles obtained 5 a snrn. Sixth chapter material designed to introduce the concept of template synthesis of nanostructures, complex organic polymer nanostructures synthesis system, an organic interaction density functional theory calculations. Through geometry and electronic structure and energy calculation, a detailed description of the assembly process of the interaction based on the organic organic synthesis gives a series of laws and a suitable organic monomers and has been screened through these synthesis law corresponding nanostructure. Seventh different pore structure of mesoporous silica film as a template, using the method of electrochemical deposition synthesis of metallic copper and semiconductor zinc oxide nanomaterials. Hexagonal pore structure of mesoporous silica template diameter 7lun metal copper nanowire arrays; cage-like body-centered cubic pore structure template quality nanoparticles of copper single dumbbell-shaped morphology. Makes zinc oxide zinc oxide nanostructures, electrochemical deposition process to completely fill the silicon oxide corpse 'r' \> 'a''' \channels, respectively, hexagonal and body-centered cubic dielectric structure ZnolsiOZ nanocomposite film. thesis of Chapter VIII, mesoporous silica monolithic material as a template, synthesized with a sheet block macro morphology Ordered carbon mesoporous materials. resulting material has Ia3d symmetry bicontinuous cubic the skeleton structure, the aperture is 4.58Iun, BET specific surface area of ??1 530 mZ / g, the pore volume is 1 .93 cm3 of / g of its large specific surface area high porosity and macro-scale three-dimensional continuous referral structural skeleton, electrochemical tests reflect the electrochemical double layer capacitance nature. thesis IX, for the first time proposed a mesophase pitch carbon precursor Low melt impregnation method, mesophase pitch in the middle of the melt is injected into the pores of the mesoporous materials of the silicon oxide, having a highly ordered pore structure and graphite wall structure carbon mesoporous materials synthesis. hexagonal carbon mesoporous material, the walls of the graphite structure unit periodically arrayed, perpendicular to the (002) plane and the major axis direction of the carbon rod (c-axis). synthesized in bicontinuous cubic carbon mesoporous material is truly an Ia3d symmetric sexual reciprocal skeletal structure obtained graphitized carbon nano-fiber bundle diameter of about 7nm, an interesting material having a spiral-shaped lattice structure, more favorable to their electrochemical charge-discharge process. tenth study a simple solvothermal system mesophase self-assembly behavior of asphalt fused ring molecules, are very uniform size and morphology of submicron amorphous carbon beads, the diameter of which are adjustable in the range of 200 to 700nm single morphology yield extremely high. proposed a low-temperature, solvent-free catalytic thermal process, still using mesophase pitch as carbon precursor, join the block copolymer P123 additives, synthetic organic structure of ultra-small size graphite nanoparticles ( 6Iun and 3nm), carbon onion particles and graphite Nami Sheng, we hope through this series of synthetic restrictions

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