SnO2 hollow spheres and rod bundles were prepared using SnSO4 as raw material and sodium dodecyl benzenesulfonate and poly(vinyl pyrrolidone)as templates at room temperature through oxidation-crystallization of colloi...SnO2 hollow spheres and rod bundles were prepared using SnSO4 as raw material and sodium dodecyl benzenesulfonate and poly(vinyl pyrrolidone)as templates at room temperature through oxidation-crystallization of colloidal spheres in different systems.The products were characterized with X-ray diffractometer,X-ray photoelectron spectrometer,transmission electron microscope and scanning electron microscope.Meanwhile,the catalytic performance of the SnO2 hollow spheres and rod bundles toward CO oxidation was studied.The result indicates that SnO2 hollow spheres with the uniform size exhibit a better catalytic activity toward CO oxidation,suggesting that the morphology of the materials has exerted a noticeable influence on the catalytic performance.展开更多
The effect of KBr on the size, shape and microviscosity of CTAB micelles has been investigated by means of laser light scattering (LLS), 1H NMR measurements and fluorescence probe. The data obtained from the various t...The effect of KBr on the size, shape and microviscosity of CTAB micelles has been investigated by means of laser light scattering (LLS), 1H NMR measurements and fluorescence probe. The data obtained from the various techniques are quantitatively in agreement. The Rh of micelles in 0.01 mol ·L-1 CTAB solution increases from 3.5 nm to 43 nm and Rg increases to 89 nm with addition of KBr salt. In this process, both the microviscosity and molecular weight of micelles Mw have noticeable increases, too. The rod-like micelles are formed at 0.1 mol ·L -1 KBr and the worm-like micelles are formed at above 0.2 mol ·L-1 KBr.展开更多
文摘SnO2 hollow spheres and rod bundles were prepared using SnSO4 as raw material and sodium dodecyl benzenesulfonate and poly(vinyl pyrrolidone)as templates at room temperature through oxidation-crystallization of colloidal spheres in different systems.The products were characterized with X-ray diffractometer,X-ray photoelectron spectrometer,transmission electron microscope and scanning electron microscope.Meanwhile,the catalytic performance of the SnO2 hollow spheres and rod bundles toward CO oxidation was studied.The result indicates that SnO2 hollow spheres with the uniform size exhibit a better catalytic activity toward CO oxidation,suggesting that the morphology of the materials has exerted a noticeable influence on the catalytic performance.
文摘The effect of KBr on the size, shape and microviscosity of CTAB micelles has been investigated by means of laser light scattering (LLS), 1H NMR measurements and fluorescence probe. The data obtained from the various techniques are quantitatively in agreement. The Rh of micelles in 0.01 mol ·L-1 CTAB solution increases from 3.5 nm to 43 nm and Rg increases to 89 nm with addition of KBr salt. In this process, both the microviscosity and molecular weight of micelles Mw have noticeable increases, too. The rod-like micelles are formed at 0.1 mol ·L -1 KBr and the worm-like micelles are formed at above 0.2 mol ·L-1 KBr.
