The micropore structure of a series of organosilica materials with various organic groups in bridging (methylene, ethylene, hexylene, octylene, p-phenylene) and terminal (methyl, n-propyl) positions was analyzed and compared to that of inorganic amorphous silica. Vapor thermogravimetry with water, methanol, 1-propanol and cyclohexane vapors was used to measure accessible pore volumes, pore entrance sizes and surface chemistries. Gas pycnometry with He, Ar and N₂ was used to measure skeletal densities, semi-quantitative surface-to-volume ratios and surface areas, pore entrance sizes and semi-quantitative pore cavity sizes. Conventional adsorption isotherms were measured for N₂ at −196 °C to check for mesoporosity and for CO₂ at 0 °C to obtain Brunauer-Emmett-Teller surface areas for comparison. The known classification of 1) short or rigid organic bridges that open up the pore structure, 2) longer and more flexible bridges that cause pore filling and 3) terminal organic groups that reduce pore formation is further specified. The incorporation of any organic group in the silica network increased the dispersity in micropore entrance sizes as compared to inorganic silica in the probed size range. A critical discussion is given of the commonly accepted ‘spacing concept’ of organic bridges.

分析了在桥接（亚甲基，乙烯，己烯，辛烯，对亚苯基）和末端（甲基，正丙基）位置具有各种有机基团的一系列有机硅材料的微孔结构，并将其与无机无定形二氧化硅进行了比较。用水，甲醇，1-丙醇和环己烷蒸气的蒸气热重法用于测量可及的孔体积，孔入口尺寸和表面化学性质。用He，Ar和N _2的气体比重瓶法测量骨骼密度，半定量表面积与表面积的比值，表面积，孔进入尺寸和半定量孔腔尺寸。在−196°C下测量N _2的常规吸附等温线，以检查中孔性和CO₂在0°C下获得Brunauer-Emmett-Teller表面积用于比较。进一步定义了已知的分类：1）短或刚性的有机桥，它们打开了孔结构； 2）较长且更柔韧的桥，导致孔被填充； 3）末端有机基团减少了孔的形成。与在所探测的尺寸范围内的无机二氧化硅相比，二氧化硅网络中任何有机基团的引入均增加了微孔入口尺寸的分散性。对有机桥梁的普遍接受的“间距概念”进行了批判性讨论。