Lead oxide nanoparticles embedded carbon composites have been fabricated via the pyrolysis of Pb(NO3)2 impregnated starch gel under a N2 gas flow. The products were characterized by XRD,TGA,and TEM. The mass ratio between starch and Pb(NO3)2 greatly affected the final produts. The particle sizes of PbO decreased with the content of starch increased in the starting gel. Gel with mass ratio of 85∶15 between starch and Pb(NO3)2 gave rise to well-dispered lead oxide nanoparticles with tubable size and narrow size distribution that embedded in the carbon matrix. The particle sizes were in the range of 9—15 nm. Varying the reaction temperature would change the form of lead oxide. Lead oxide in the products calcined at 1000 ℃ was mainly β-PbO.
A novel three-dimensional manganese zinc phosphatophosphite [H2CHBMA][Zn1.5Mn(HPO3)2\5(PO4)]\5H2O(TJPU-3Mn) with extra-large twenty-membered ring channels was isolated by 1,3-cyclohexanebis(methylamine) as the template under hydrothermal conditions.Single crystal structure refinement reveals that TJPU-3Mn crystallizes in the monoclinic space group C2/c,with cell parameters,a=3.3929(7) nm,b=1.3045(3) nm,c=0.89713(18) nm,β=104.37(3)°,V=3.8465(13) nm3,Z=2.The connectivities of the ZnO4,MnO4,PO4 and HPO3 groups create a three-dimensional porous architecture with extra-large twenty-membered ring channels intersected by eight-membered rings.It is the first structure analogue to the famous aluminophsphate JDF-20.More interestingly,the diprotonated CHBMA cations in the channel are all in cis configuration,indicating the potential for separation and recognition of CHBMA isomers.Powder X-ray patterns reveal the structure of TJPU-3Mn sustains after the emission of water molecules obtained by calcining at 150 ℃ for 2 h.
Hybrid polymer/BaZrO3 hollow nanospheres were successfully synthesized via a simple polymer assisted hydrothermal route.Polymer additives play a key role on the formation of hollow nanospheres.The samples prepared in the absence of polymers are microcubes.The basicity also plays an important role on the formation of hollow nanospheres.In low concentration medium,the products are microcubes.Hollow spheres formed when the is larger than 4 mol/L.Pure hollow spheres could be formed with the over 8 mol/L.IR and TG data indicate the hybrid feature of the products.The polymer content(mass fraction)declined from 33 to 6 by adjusting the basicity from 8 to 16 mol/L.The diameters of nanos-pheres are tunable in the range of 300-100 nm via increasing the basicity.
