The Application Of Oscillating Chemical Reactions In The Analytical Chemistry And The Research Of New Oscillating Chemical Reactions

The phenomena of nonequilibrium and nonlinear in the nature has attracted more and more reasearchers to study deeply. The research of chemical oscillation was fruitful both in theoretical and in experimental chemical kinetics.in recent years. More and more oscillating chemical reactions and their chemical kinetics were explored and oscillating chemical reactions were not limmited to pure theoretical studis any more, but used in the application of analytical determination. The paper reports the effect of Cr₂O^2-₇ on the B-Z oscillating system and its application in analytical chemistry, chemical oscillator using ninhydrin as a single organic substrate, liquid-membrane oscillator with crystal violet as cation surfactant, and macroscopic interface self-motion in an oil/water liquid membrane system. Part I Review: The application of oscillating chemical reactions in the analytical chemistry and the reseach of new oscillating chemical reactionsThis review provides a brief introduction to the development of the oscillating chemical reactions. Some oscillating chemical reactions, theoretical model, thermodynamic parameters and their applications are described in detail. The way to get new oscillating chemical reactions and the perspective of oscillating chemical reactions were discussed. Part II The effect of Cr₂O^2-₇ on the BZ oscillating chemical reactionThe addition of Cr₂O^2-₇ to the component solutions of the B-Z oscillating system can inhibit oscillating phenomena and even cease them totally, depending on the concentration of Cr₂O^2-₇. Moreover, we find the induction period change of B-Z oscillating system is linearly proportional to the concentration of Cr₂O^2-₇ in the range 3.45×10^-6--6.20×10^-4M, with the regression coefficient is 0.9992. The mechanism involving Cr₂O^2- is present in detail. Part III A novel chemical oscillator using ninhydrin as single organic substrateA novel chemical oscillator using ninhydrin as a single organic substrate was represented in mis paper. Potential oscillation phenomenon can be obtained both in batch and open system. As distinguished from the classic B-Z chemical oscillator, there is no active methene 2=) and/or enol structure in the ninhydrin molecule, which served only as single organic substrate. Because there was no bromination process in the oscillating system and thus the reproductionof bromide ion during the oscillating process could not be illustrated satisfactorily by FKNmechanism.Part IV A new liquid-membrane oscillator with crystal violet as cationsurfactantNonlinear behavior at oil/water interface membrane was reported. In certain concentration range, rhythmic oscillation and chaos of electrical potential were detected. The feature of the oscillation was novel: within a period, there were not only rhythmic oscillations but also chaos of electrical potential. The surfactant used in the proposed system was crystal violet, a kind of biology surfactant; many medicines are also biology surfactant, so it can be used to simulate transference of similar matter through cell membrane to obtain useful information.Part V Macroscopic interface self-motion in an oil/water liquid membrane systemA self-motion of oil/water system was studied and several self-motion patterns were found, such as random motion, wave-like motion and teeterboard-like motion for a two-phase system, in which the oil phase was a mixture solution containing nitrobenzene, picric acid and alcohol; and the aqueous phase was a solution of CTAB. The behavior of interface self-motion was found closely related to the boundary conditions, such as concentration of reactants, surface structure of reaction vessel wall and so on. The mechanism of these motions was deduced.