| Metal-organic frameworks(MOFs)have been widely developed as superhydrophobic materials because of their unique pore structure and adjustable functional group sites.Polyoxometalates(POMs)have excellent stability and reversible multi-electron transfer ability.The inorganic-organic hybrid photochromic material formed by polyoxmetalate and multi-pyridine ligands will have the rapid photoresponse of organic ligands,while maintaining the stability of POMs and reversible multi-electron transfer capabilities.In this research,two MOF materials were synthesized and superhydrophobic composite sponges were prepared.Inorganic-organic hybrid photochromic materials were synthesized by multi-pyridine ligands,phosphomolybdic acid and silicotungstic acid,and studied its discoloration performance under light.The specific research contents are as follows:(1)[Ni6(OH)4(BTB)8/3(H2O)6]·4H2O·9DMFand[Co6(OH)4(BTB)8/3(H2O)6]·4H2O·9DMFweresynthesizedby1,3,5-tris(4-carboxyphenyl)benzene,cobalt acetate,nickel acetate and other raw materials.Hydrophobic sponge with MOF coating was prepared by ultrasonic dispersion method.The MOF materials were characterized by XRD,SEM,EDS,IR and XPS.The influence of different low surface energy modifiers on the wettability of hydrophobic sponge was investigated,and it was found that the fluorosilane-modified composite sponges had the best wettability and reached a superhydrophobic state.The effects of solvent,temperature and p H value on the superhydrophobic composite sponge were also discussed.(2)[Ni(1,10-phen)3]3(PMo12O40)2(1,10-phen:1,10-phenanthroline monohydrate)and[Cu(1,10-phen)3]3(PMo12O40)2 polyoxometalate composite materials were synthesized by a simple chemical co-precipitation method.The chemical structure and morphology of the products were characterized by elemental analysis,XRD,SEM,IR,DRS and XPS.It was found that the samples in three forms of powder,film and solution will change color within ten minutes.The photochromic wavelength range of the powder sample was discussed,and the photochromic mechanism was explored.(3)[Ni(2,2'-bipy)3]3(PMo12O40)2,(2,2'-bipy:2,2'-bipyridin)and[Cu(2,2'-bipy)3]3(PMo12O40)2 polyoxometalate composite materials were synthesized by a simple chemical co-precipitation method.The chemical structure and morphology of the products were characterized by elemental analysis,XRD,SEM,IR,DRS and XPS.The sample can change color in the three forms of powder,film and solution.The effects of different solvents on the photochromic properties of the samples with film morphology were discussed,and the photochromic wavelength range of the samples with film morphology was studied.(4)Two hybrid photochromic materials[Ni(1,10-phen)3]2Si W12O40?2DMF(DMF:N,N-Dimethylformamide)and[Cu(1,10-phen)3]2Si W12O40?2DMF were synthesized by mixed solvent crystallization method.The chemical structure and morphology of the products were characterized by elemental analysis,XRD,SEM,IR,DRS and XPS.The sample can change color in the three forms of powder,film and solution,and can restore the original color within six days.The photochromic wavelength range of the powder sample was discussed,and the photochromic mechanism was explored. |
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