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首页> 外文期刊>Chemistry - A European Journal >Periodic Mesoporous Organosilica (PMO) Materials with Uniform Spherical Core-Shell Structure
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Periodic Mesoporous Organosilica (PMO) Materials with Uniform Spherical Core-Shell Structure

机译:具有均匀球形核壳结构的周期性介孔有机硅(PMO)材料

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摘要

We report the synthesis of monodisperse, spherical periodic mesoporous organosilica (PMO) materials. The particles have diameters between about 350 and 550 nm. They exhibit a regular core-shell structure with a solid, non-porous silica core and a mesoporous PMO shell with a thickness of approximately 75 nm and uniform pores of about 1.7 nm. The synthesis of the core and the shell is carried out in a one-pot, two-stage synthesis and can be accomplished at temperatures between 25 and 100 °C. Higher synthesis temperatures lead to substantial shrinking of the solid core, generating an empty void between core and shell. This leads to interesting cavitation phenomena in the nitrogen physisorption analysis at 77.4 K.
机译:我们报告了单分散的球形周期性介孔有机二氧化硅(PMO)材料的合成。颗粒的直径在约350至550nm之间。它们表现出规则的核-壳结构,具有固体无孔二氧化硅核和中孔PMO壳,厚度约75 nm,均匀孔约1.7 nm。核和壳的合成是一锅两步合成,可以在25至100°C之间的温度下完成。较高的合成温度导致实心核大量收缩,从而在核和壳之间产生空洞。这会在77.4 K的氮物理吸附分析中引起有趣的空化现象。

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