Authors affirm that "the presence of surfactant is the most (important??) factors which promote the increasing of the pore size". It is not clear if the pore size is determined by the introduction of a surfactant in the sol (and in this case it should the only factor promoting the increasing of the pore size), or by the surfactant kind and/or quantity.
or by the surfactant kind and/or quantity.主要是这句话什么意思？
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