Magnetischer, hochporöser geordneter Kohlenstoff vom CMK‐3‐ und CMK‐5‐Typ mit reinem Kohlenstoff‐ oder Kohlenstoff‐Stickstoff‐Gerüst wurde hergestellt. Die Materialien sind effiziente magnetische Adsorbentien (siehe Bild) oder Katalysatoren, doch kann man sich weit darüber hinaus gehende Anwendungen vorstellen.
Dedicated to Professor Dieter Fenske on the occasion of his 60th birthdayThe replication of nanoscale structures by a direct templating process has been used in recent years in several creative ways for the synthesis of carbon replicas of zeolites [1] or ordered mesoporous carbons, such as CMK-1 [2] or SNU-1. [3] Such processes rely on the fact that an ordered pore system, provided by the zeolite or ordered mesoporous silica, can be filled with a carbon precursor which is pyrolyzed and the silica leached with NaOH or HF solution. However, the technique is difficult to apply to the synthesis of framework compositions other than carbon, since the leaching of the silica typically also affects the material which is filled into the silica pore system. This problem could possibly be circumvented by not using the silica as the mold, but to instead go one step further and use the mesoporous ordered carbons as templates, which could then easily be removed by combustion or other techniques, as suggested recently. [4] On the macroscale, that is, for the production of photonic crystals, similar approaches are well known, where latex spheres are used as templates which can be removed by calcinations. [5] Also carbon black has been used as a ™template∫, for instance to synthesize mesoporous zeolite single crystals, in which the pores, however, are disordered. [6] In a first attempt to show the feasibility of using ordered mesoporous carbon to synthesize ordered mesoporous oxides, we decided to template mesostructured silica by using an ordered mesoporous carbon. Although this brings one only back to the starting point, that is, a mesoporous silica, it ZUSCHRIFTEN
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