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Lawson HS, Holló G, Német N, Teraji S, Nakanishi H, Horvath R, Lagzi I. Design of non-autonomous pH oscillators and the existence of chemical beat phenomenon in a neutralization reaction. Sci Rep 2021; 11:11011. [PMID: 34040025 PMCID: PMC8155044 DOI: 10.1038/s41598-021-90301-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 05/10/2021] [Indexed: 11/08/2022] Open
Abstract
The beat in physical systems is a transparent and well-understood phenomenon. It may occur in forced oscillatory systems and as a result of the interference of two waves of slightly different frequencies. However, in chemical systems, the realization of the latter type of the beat phenomenon has been lacking. Here we show that a periodic titration of acid and alkaline solutions with each other using programmable syringe pumps in a continuous stirred-tank reactor exhibits the beat phenomenon in the temporal pH oscillation pattern if the time periods of sinusoidal inflow rates of the reagents are slightly different. Interestingly, the frequency of the chemical beat pattern follows the well-known relationship from physics, namely the frequency of the beat is equal to the absolute value of the difference of the two wave frequencies. Based on our strategy, we can design and engineer non-autonomous pH oscillatory systems, in which the characteristics of the temporal oscillations (amplitude, time period) can easily and precisely be controlled by the experimental conditions such as the inflow rates and feed concentrations. The demonstrated phenomena can be exploited in practical applications, we use the non-autonomous pH oscillators to drive the reversible assembly and disassembly of pH-sensitive building blocks (oleic acid and gold nanoparticles), both highly relevant in nanotechnology and biomedical applications.
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Affiliation(s)
- Hugh Shearer Lawson
- Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary
| | - Gábor Holló
- MTA-BME Condensed Matter Physics Research Group, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary
| | - Norbert Német
- Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary
| | - Satoshi Teraji
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan
| | - Hideyuki Nakanishi
- Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto, 606-8585, Japan
| | - Robert Horvath
- Nanobiosensorics Group, Institute of Technical Physics and Materials Science, Centre for Energy Research, Konkoly Thege M. u. 29-33, Budapest, 1121, Hungary
| | - István Lagzi
- Department of Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary.
- MTA-BME Condensed Matter Physics Research Group, Budapest University of Technology and Economics, Budafoki út 8, Budapest, 1111, Hungary.
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Light and chemical oscillations: Review and perspectives. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2020. [DOI: 10.1016/j.jphotochemrev.2019.100321] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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