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首页> 外文期刊>Journal of porous materials >Preparation of Spherical Hexagonal Mesoporous Silica
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Preparation of Spherical Hexagonal Mesoporous Silica

机译：球形六角形介孔二氧化硅的制备

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A series of hexagonal mesoporous silica (HMS) have been synthesized by the neutral assemble pathway in water-alcohol cosolvent systems, using dodecylamine (DDA) and tetraethyl orthosilicate (TEOS) as the starting materials. These materials were characterized with powder X-ray diffraction, nitrogen sorption measurement, differential thermal analysis, and transmission electron microscopy. The XRD patterns of these samples exhibited a strong intense reflection at low angle, suggesting the excellent mesostructures of the samples. The particle size of HMS decreased and the morphology of HMS exhibited high textural porosity as the HMS was prepared with high addition rate of TEOS. The particle size of HMS prepared without aging was smaller than that aged for 18 h, due to the reaction time of TEOS was not enough to form complete particles. Addition of NaCl and HCl hindered the formation of HMS mesoporous structure. In contrast, addition of 1-butanol did not affect the formation of HMS mesoporous structure. The sphereical HMS silica with uniform size has been synthesized by adjusting DDA and TEOS concentrations. The shape of HMS became larger and more spherical as the concentrate on of DDA decreased. The stirring rate of the reaction mixture had no effect on either the shape or the size of the spheroid HMS silicas. However, the particles started to crack at higher stirring rates.
机译：以十二烷基胺（DDA）和原硅酸四乙酯（TEOS）为起始原料，在水-醇共溶剂体系中通过中性组装途径合成了一系列六角形介孔二氧化硅（HMS）。用粉末X射线衍射，氮吸附测量，差热分析和透射电子显微镜对这些材料进行了表征。这些样品的XRD图谱在低角度下显示出强烈的强烈反射，表明样品具有出色的介孔结构。 HMS的粒度减小并且HMS的形态表现出高的结构孔隙率，因为以高的TEOS添加率制备了HMS。由于TEOS的反应时间不足以形成完整的颗粒，因此未老化的HMS的粒径小于老化18 h的粒径。 NaCl和HCl的加入阻碍了HMS中孔结构的形成。相反，添加1-丁醇不影响HMS介孔结构的形成。通过调节DDA和TEOS的浓度，可以合成出具有均一尺寸的球形HMS二氧化硅。随着DDA浓度的降低，HMS的形状变得更大，更球形。反应混合物的搅拌速率对球状HMS二氧化硅的形状或尺寸均没有影响。但是，颗粒在较高的搅拌速率下开始破裂。

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