17 research outputs found
Space-and time-resolved diffusion-limited binary reaction kinetics in capillaries: experimental observation of segregation, anomalous exponents, and depletion zone
An experimental investigation of one-dimensional, diffusion-limited A+BâC chemical reactions is reported. The persistence of reactant segregation and the formation of a depletion zone is observed and expressed in terms of the universal time exponents: Îą (motion of the boundary zone), β (width of instantaneous product formation zone), Îł (rate of instantaneous local formation of product), δ (rate of instantaneous global formation of product), etc. There is good agreement with the recently predicted and/or simulated values: Îą =1/2, β =1/6, Îł =2/3, δ =1/2, in contrast to classical predictions ( Îą =0, β =1/2, Îł =0, δ =â1/2). Furthermore, classically the segregation would not be preserved and there would be no formation of a depletion zone and no motion (just dissipation) of the reaction zone. We also discuss the relations to electrode oxidation-reduction reactions, i.e., A+CâC where C is a catalyst, electrode, or âtrap.âPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45162/1/10955_2005_Article_BF01049588.pd