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首页> 外文期刊>Journal of Materials Science >Morphological control on SBA-15 mesoporous silicas via a slow self-assembling rate
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Morphological control on SBA-15 mesoporous silicas via a slow self-assembling rate

机译：通过缓慢的自组装速率对SBA-15中孔二氧化硅进行形态控制

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摘要

Pluronic 123-templated mesoporous SBA-15 silica rods with a length of ca. 3.0-4.0 mu m were easily synthesized in a dilute silicate solution with a pH value of 2.0 at room temperature. Through a good control on the synthetic condition and the chemical components, a high homogeneity (> 95%) of the hexagonal SBA-15 silica rods can be achieved. In addition, the effect of the synthetic conditions including acid source, weight ratio of the P123/sodium silicate, temperature, water content, pH value, and applying shearing flow were explored in detail to tailor the morphologies of the SBA-15 mesoporous silicas. In this paper, we also focused on the counterion effect on the synthesis of the SBA-15 mesoporous silicas. It was found that the SO4 (2-) counterion from H2SO4 has higher affinity to induce the formation of P123 rod-like micelles than that of Cl-, NO3 (-). Meanwhile, we postulated that the self-assembly pathway of the silica species and the neutral tri-block copolymer micelles in a dilute solution with a pH value of 2.0 would occur through an S-0 center dot center dot center dot I-0 rather than the (SX-aEuro broken vertical bar I+)-X-0 one as previously discussed. We further employed the SAB-15 mesoporous silica rods as the templates to synthesize high-quality CMK-3 mesoporous carbon rods by using commercially available phenol-formaldehyde (PF) resin as the carbon source.
机译：Pluronic 123模板的中孔SBA-15硅胶棒的长度约为在室温下在pH值为2.0的稀硅酸盐溶液中容易合成3.0-4.0μm。通过对合成条件和化学成分的良好控制，可以实现六角形SBA-15硅胶棒的高均质性（> 95％）。此外，详细研究了合成条件的影响，包括酸源，P123 /硅酸钠的重量比，温度，水含量，pH值和施加剪切流量，以定制SBA-15中孔二氧化硅的形貌。在本文中，我们还关注了抗衡离子对SBA-15中孔二氧化硅合成的影响。发现来自H 2 SO 4的SO 4（2-）抗衡离子具有比C1-NO 3（-）更高的亲和力，以诱导P123棒状胶束的形成。同时，我们假设在pH值为2.0的稀溶液中，二氧化硅物种和中性三嵌段共聚物胶束的自组装途径将通过S-0中心点中心点中心点I-0而不是（SX-aEuro垂直折线I +）-X-0，如前所述。我们进一步使用SAB-15介孔二氧化硅棒作为模板，通过使用可商购的酚醛（PF）树脂作为碳源来合成高质量CMK-3介孔碳棒。

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