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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Freeze-dried resorcinol-formaldehyde gels
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Freeze-dried resorcinol-formaldehyde gels

机译：冻干间苯二酚-甲醛凝胶

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摘要

The texture of resorcinol-formaldehyde gels, previously synthesized by Pekala et al. [1-6], but dried by freeze-drying was studied. The freeze-dried gels present a complex porous structure from nanometer to micrometer length-scale. Taking a standard freezing rate, we study in detail the influence of the molar ratio resorcinol/catalyst on the texture, This molar ratio is one of the parameters under consideration which can lead to a tailoring of the dried gel texture in order to develop adsorbents or catalyst supports of controlled porosity. Characterization methods include nitrogen adsorption-desorption (including the classical and the fractal interpretations), mercury porosimetry, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS).
机译：Pekala等人先前合成的间苯二酚-甲醛凝胶的质地。 [1-6]，但是研究了通过冷冻干燥来干燥。冷冻干燥的凝胶呈现出从纳米到微米长度尺度的复杂的多孔结构。以标准的冷冻速率，我们详细研究间苯二酚/催化剂的摩尔比对质地的影响。该摩尔比是所考虑的参数之一，可导致定制干燥的凝胶质地以产生吸附剂或孔隙率受控的催化剂载体。表征方法包括氮吸附-解吸（包括经典解释和分形解释），汞孔隙率法，扫描电子显微镜（SEM），透射电子显微镜（TEM）和小角X射线散射（SAXS）。

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