Physicochemical study of nanocapsular layered double hydroxides evolution
Physicochemical study of nanocapsular layered double hydroxides evolution
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DOI：
10.1021/jp810293y
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发表时间：
2009-03
影响因子：
3.7
通讯作者：
J. Valente;J. Prince;A. Maubert;L. Lartundo-Rojas;P. Angel;G. Ferrat;Jose G. Hernandez;E. López-Sal
中科院分区：
文献类型：
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作者：
J. Valente;J. Prince;A. Maubert;L. Lartundo-Rojas;P. Angel;G. Ferrat;Jose G. Hernandez;E. López-Sal
提出了一种溶胶-凝胶法制备MgAl层状双氢氧化物的方法。这样得到的溶胶在有水或没有水的情况下进行了多次热液处理，以检查特定物理化学性质的热演化，如形态、晶体大小、碱度和结构性质。通过透射电子显微镜（TEM）和扫描电子显微镜技术观察其形态演变。透射电镜分析显示独特的纳米囊形态；纳米胶囊随着水热处理时间的延长而生长，并在有水存在的情况下聚集。x射线衍射证实了晶体尺寸增大的预期。煅烧固体的氮吸附-解吸表面分析（Brunauer - Emmett - Teller）表明，煅烧固体的表面积在251 ~ 289 m2 g−1之间。此外，以CDCl3为探针分子的CO2热程序解吸和傅里叶变换红外分析表明，其基本强度与碳的浓度成反比。
A sol−gel method for the synthesis of MgAl layered double hydroxides is presented. The sols thus obtained were submitted to several hydrothermal treatments, in presence or absence of water, in order to examine the thermal evolution of specific physicochemical properties, such as morphology, crystal size, basicity, and textural properties. The morphological evolution was followed by transmission electron microscopy (TEM) and scanning electron microscopy techniques. TEM analyses revealed unique nanocapsular morphology; the nanocapsules grow with increasing hydrothermal treatment time and aggregate in the presence of water. X-ray diffraction confirms the expected increase in crystal size. The nitrogen adsorption−desorption surface analysis (Brunauer−Emmett−Teller) of the calcined solids indicates that surface areas range from 251 to 289 m2 g−1. Furthermore, CO2 thermoprogrammed desorption and Fourier-transform infrared analyses using CDCl3 as a probe molecule indicate that basic strength is inversely proport...