文摘
All pH-oscillators reported to date function only under open (flow reactor) conditions. We describe an approach to generating pH-oscillations in a closed system by starting from an open system pH-oscillator, finding semibatch conditions under which it oscillates with an inflow of a single reactant to an otherwise closed reactor containing the remaining components, and replacing this inflow with a layer of silica gel impregnated with the key reactant. We present data showing the successful application of this technique to the BrO3鈥?/sup>鈥揗n2+鈥揝O32鈥?/sup>, IO3鈥?/sup>鈥揊e(CN)64鈥?/sup>鈥揝O32鈥?/sup>, and BrO3鈥?/sup>鈥揊e(CN)64鈥?/sup>鈥揝O32鈥?/sup> systems. In all three cases, sulfite ion is the species that is replenished via dissolution from the gel layer.