Diffusionsbegrænsning
Diffusionsbegrænsning refers to a phenomenon in chemical reactions where the overall rate of the reaction is limited by how quickly reactants can diffuse through a medium to reach each other. This is particularly relevant in reactions occurring in solutions, gels, or biological systems where molecules are not in direct contact but are suspended in a solvent or matrix. In such cases, even if the intrinsic chemical reaction rate between the molecules is very fast, the observed reaction speed will be slower because the molecules must first travel through the medium to encounter each other. The diffusion process, governed by Fick's laws, involves the random motion of particles from regions of high concentration to regions of low concentration.
When a reaction is diffusion-limited, the rate is primarily dependent on factors that affect diffusion, such