Characterization of the Pore Structure of Three-Dimensionally Ordered Mesoporous Carbons Using High Resolution Gas Sorption

摘要

The use of colloidal crystals with various primary particle sizes as templates leads to the formation of threedimensionallynordered mesoporous (3DOm) carbons containing spherical pores with tailorable pore size and extremely highnpore volumes. We present a comprehensive structural characterization of these novel carbons by using nitrogen (77.4 K) andnargon (87.3 K) adsorption coupled with the application of novel, dedicated quenched solid density functional theory (QSDFT)nmethods which assume correctly the underlying spherical pore geometry and also the underlying adsorption mechanism. Thenobserved adsorption isotherms are of Type IV with Type H1-like hysteresis, despite the fact that pore blocking affects thenposition of the desorption branch. This follows also from detailed, advanced scanning hysteresis experiments which not onlynallow one to identify the underlying mechanisms of hysteresis, but also provide complementary information about the texture ofnthese unique porous materials. This work addresses the problem of pore size analysis of novel, ordered porous carbons andnhighlights the importance of hysteresis scanning experiments for textural analysis of the pore network.