Complex periodic oscillations which are associated with Farey sequences and sustained aperiodic oscillations (maybe chemical chaos) have been first observed in Hydrogen Peroalde-Potassium Thiocyanate-Cupric Sulfate Sy...Complex periodic oscillations which are associated with Farey sequences and sustained aperiodic oscillations (maybe chemical chaos) have been first observed in Hydrogen Peroalde-Potassium Thiocyanate-Cupric Sulfate System in a CSTR. When pH is high (generally at pH>9), oscillations in pH and Pt potential in solution are synchronous,and pH increases as Pt potential in solution increases; when pH is low (gernerally pH<9),oscillations in pH and Pt potential are antiphase. Birthymicity of two oscillations appears at a same condition. A simple explanation is discussed.展开更多
In absence of catalysts, Oscillations in the oxidation of KSCN、Na2S2O3 and SC(NH2)2 by H2O2 are observed in CSTR experiments, single-peak and other phenomena are observed in batch experiments. Oscillations in pH and ...In absence of catalysts, Oscillations in the oxidation of KSCN、Na2S2O3 and SC(NH2)2 by H2O2 are observed in CSTR experiments, single-peak and other phenomena are observed in batch experiments. Oscillations in pH and Pt potential are antiphase in H2O2-Na2S2O3-H+ system and H2O2-KSCN-OH- system, but oscillations in pH and Pt potential are synchronous I n H2O2-SC(NH2)2-H+ system.展开更多
The influences of Ag+, Hg2+ and Tl3+ on the B-Z reaction were studied preliminarily. The limit cycles of the oscillating systems in pvesence of bromide removing ions were observed. The mechanism of the unusual oscilla...The influences of Ag+, Hg2+ and Tl3+ on the B-Z reaction were studied preliminarily. The limit cycles of the oscillating systems in pvesence of bromide removing ions were observed. The mechanism of the unusual oscillation was analysed simply.展开更多
It was found from experiments that the addition of polythylene glycol (PEG) can make the B-Z and B-R reactions producing double induction periods, i.e. before the general induction period there is an earlier stage of ...It was found from experiments that the addition of polythylene glycol (PEG) can make the B-Z and B-R reactions producing double induction periods, i.e. before the general induction period there is an earlier stage of induction in which there is no any change of color and state. The lifetime of the earlier stage is not noly effected by the concentration of PEG, but also by the time of the last reagent added. It was also found that there are two linear relationships between the concentration of PEG and the reduced viscodity of PEG solution or/and the lifetime of the earlier stage of induction. Another characteristic of PEG effect is that it can decrease the period change during the oscillat ing reactions. These experimental results are not only useful in the research pf chemical oscillation, but also give a simple method for determining colligative properties of macro molecule sultion.展开更多
文摘Complex periodic oscillations which are associated with Farey sequences and sustained aperiodic oscillations (maybe chemical chaos) have been first observed in Hydrogen Peroalde-Potassium Thiocyanate-Cupric Sulfate System in a CSTR. When pH is high (generally at pH>9), oscillations in pH and Pt potential in solution are synchronous,and pH increases as Pt potential in solution increases; when pH is low (gernerally pH<9),oscillations in pH and Pt potential are antiphase. Birthymicity of two oscillations appears at a same condition. A simple explanation is discussed.
文摘In absence of catalysts, Oscillations in the oxidation of KSCN、Na2S2O3 and SC(NH2)2 by H2O2 are observed in CSTR experiments, single-peak and other phenomena are observed in batch experiments. Oscillations in pH and Pt potential are antiphase in H2O2-Na2S2O3-H+ system and H2O2-KSCN-OH- system, but oscillations in pH and Pt potential are synchronous I n H2O2-SC(NH2)2-H+ system.
文摘The influences of Ag+, Hg2+ and Tl3+ on the B-Z reaction were studied preliminarily. The limit cycles of the oscillating systems in pvesence of bromide removing ions were observed. The mechanism of the unusual oscillation was analysed simply.
文摘It was found from experiments that the addition of polythylene glycol (PEG) can make the B-Z and B-R reactions producing double induction periods, i.e. before the general induction period there is an earlier stage of induction in which there is no any change of color and state. The lifetime of the earlier stage is not noly effected by the concentration of PEG, but also by the time of the last reagent added. It was also found that there are two linear relationships between the concentration of PEG and the reduced viscodity of PEG solution or/and the lifetime of the earlier stage of induction. Another characteristic of PEG effect is that it can decrease the period change during the oscillat ing reactions. These experimental results are not only useful in the research pf chemical oscillation, but also give a simple method for determining colligative properties of macro molecule sultion.
