The effect of the amount of oxygen in carbons on the quantity of non-freezable pore water was studied to evaluate and to develop a simple methodology for the determination of the delta layer (ẟ). Porous carbon was oxidized by different ways to obtain samples with different surface oxidation degrees. It was found out that with the increasing oxygen content in carbonaceous samples, the amount of non-freezable water increases. Based on the quantity of unfrozen pore water and texture properties (from gas physisorption experiments), several approaches (4 in total) for the determination of the ẟ were tested. Regardless of the concrete approach, it was proved that the delta layer is not constant, but it strongly depends on the carbon chemistry in the way that its thickness significantly increases with increasing amount of oxygen (in the range of 0.46–2.72 nm in our case). To obtain reliable results (porosity information) from thermoporometry experiments it is necessary to take into account the surface chemistry and (in ideal case) to estimate the width of ẟ layer for specific class of materials by preliminary experiments. The suggested approaches for the evaluation of the ẟ layer value aim to making the thermoporometry a wide-spread method.

研究了碳中氧含量对不可冻结孔隙水量的影响，以评估和开发一种简单的方法来确定三角洲层 ( ẟ )。多孔碳通过不同方式氧化得到不同表面氧化程度的样品。发现随着含碳样品中氧含量的增加，非冻结水的量增加。基于未冻结孔隙水的数量和质地特性（来自气体物理吸附实验），几种方法（共 4 种）用于确定ẟ进行了测试。无论采用何种具体方法，都证明 delta 层不是恒定的，但它强烈依赖于碳化学，其厚度随着氧气量的增加而显着增加（在我们的案例中为 0.46-2.72 nm ）。为了从热孔测量实验中获得可靠的结果（孔隙率信息），有必要考虑表面化学，并且（在理想情况下）通过初步实验估计特定类别材料的ẟ层的宽度。评估ẟ层值的建议方法旨在使热孔测量法成为一种广泛应用的方法。