Belova Valentina, Möhwald Helmuth, Shchukin Dmitry G
Max-Planck Institute of Colloids and Interfaces, D14476 Potsdam, Germany.
Langmuir. 2008 Sep 2;24(17):9747-53. doi: 10.1021/la8010822. Epub 2008 Jul 25.
Multilayered Na (+)-montmorillonite clays intercalated with Au nanoparticles were synthesized by direct ultrasonic impregnation of preformed gold colloid into the clay matrix. The sonicated composite product then consists of Au nanoparticles homogeneously dispersed in the clay. The resulting clay/nano-Au composite was calcined at 800 degrees C and characterized by BET surface area analysis, transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and Fourier transform infrared measurements. Nearly spherical-shaped gold nanoparticles, with a size of 6 +/- 0.5 nm, are located in the pores of clay calcined at 800 degrees C. Their nanocomposites are thermally stable as was shown by thermogravimetric analysis. No aggregation of the gold nanoparticles was observed during calcination. The proposed ultrasonic intercalation approach is an universal one and can be employed for synthesis of catalytically active metal-clay nanocomposites stable at high temperatures with high dispersability of the metal nanoparticles in the clay matrix.
通过将预先制备的金胶体直接超声浸渍到粘土基质中，合成了插层有金纳米颗粒的多层钠蒙脱石粘土。然后，超声处理后的复合产物由均匀分散在粘土中的金纳米颗粒组成。将所得的粘土/纳米金复合材料在800℃下煅烧，并通过BET表面积分析、透射电子显微镜、扫描电子显微镜、X射线衍射和傅里叶变换红外测量进行表征。在800℃煅烧的粘土孔隙中存在尺寸为6±0.5nm的近球形金纳米颗粒。热重分析表明其纳米复合材料具有热稳定性。煅烧过程中未观察到金纳米颗粒的聚集。所提出的超声插层方法是一种通用方法，可用于合成在高温下稳定且金属纳米颗粒在粘土基质中具有高分散性的催化活性金属-粘土纳米复合材料。
