Self-Oscillating Behaviors of Negatively Charged Polymer Chain Induced by the Belousov-Zhabotinsky Reaction

2011 ◽  
Vol 181-182 ◽  
pp. 206-211
Author(s):  
Yusuke Hara ◽  
Rumana A. Jahan
Keyword(s):  
Polymer Solution ◽  
Polymer Chain ◽  
Control Site ◽  
The Self ◽  
Sodium Bromate ◽  
Bz Reaction ◽  
Free Condition ◽  
Ru Catalyst ◽  
Damping Behavior ◽  
Belousov Zhabotinsky Reaction

In this paper, we studied the effect of the temperature and the initial concentration of sodium bromate (NaBrO3) on the aggregation-disaggregation self-oscillation for a polymer chain. The polymer chain consisted of N-isopropylacrylamide (NIPAAm), Ru catalyst of the BZ reaction and Acrylamide-2-methylpropanesulfonic acid (AMPS) as a solubility control site. The concentration of sodium bromate and the temperature significantly affected the self-oscillating behavior and the period of the aggregation-disaggregation self-oscillation. Moreover, the amplitude of the aggregation-disaggregation self-oscillation of the AMPS-containing polymer solution decreased with time. The damping behavior is originating from the increase in the size of the polymer chain. In addition, this study clarified that the period of the self-oscillation of the AMPS-containing polymer solution in the strongly acidic condition was significantly shorter than that in the acid-free condition.

Influence of Temperature and the BZ Substrate on Aggregation-Disaggregation Self-Oscillation of a Polymer Chain

2011 ◽  
Vol 467-469 ◽  
pp. 1472-1477
Author(s):  
Yusuke Hara ◽  
Rumana A. Jahan
Keyword(s):  
Polymer Solution ◽  
Polymer Chain ◽  
Life Time ◽  
The Self ◽  
The Other ◽  
Sodium Bromate ◽  
Bz Reaction ◽  
Influence Of Temperature ◽  
Other Hand ◽  
Increasing Temperature

We synthesized a self-oscillating polymer chain with a negatively charged moiety. The polymer chain caused the aggregation-disaggregation self-oscillation under the constant temperature induced by the Belousov-Zhabotinsky (BZ) reaction. In this study, we investigated the influence of temperature and the concentration of sodium bromate on the aggregation-disaggregation self-oscillation of the polymer solution (1.0 wt%) in a strongly acidic condition. As a consequence, we clarified that the life-time of the self-oscillation increased with decrease in the concentration of sodium bromate. On the other hand, the lifetime of the self-oscillation decreased with increase in temperature. In high temperature condition (48 and 60 °C), the amplitude of the self-oscillation was significantly inhomogeneous. Moreover, the frequency of the self-oscillation increased with increasing temperature. On the other hand, the frequency decreased with increase in the concentration of sodium bromate. This tendency was opposite to that in the acid-free condition and the 2.0 wt% AMPS-containing polymer solution.

A Self-Oscillating Polymer Chain with High LCST

2014 ◽  
Vol 941-944 ◽  
pp. 1208-1211 ◽  
Author(s):  
Yusuke Hara
Keyword(s):  
Polymer Chain ◽  
Driving Force ◽  
The Self ◽  
Solution Temperature ◽  
The Novel ◽  
Careful Selection ◽  
Critical Solution Temperature ◽  
Sodium Bromate ◽  
Belousov Zhabotinsky Reaction ◽  
Selection Of

A novel self-oscillating polymer displaying a high lower critical solution temperature (LCST) was developed. The novel polymer chain underwent soluble-insoluble self-oscillation induced by a Belousov–Zhabotinsky reaction. The driving force of the self-oscillation was the differing solubility of the polymer chain in the reduced and oxidized states. The amplitude of self-oscillation was hardly affected by the concentration of the oxidant, sodium bromate. In addition, the period of the polymer solution could be controlled by careful selection of the concentration of the sodium bromate.

Soluble-Insoluble Self-Oscillation of a Novel Nonthermoresponsive Polymer Chain Induced by the Belousov-Zhabotinsky Reaction

2012 ◽  
Vol 429 ◽  
pp. 37-41 ◽  
Author(s):  
Yusuke Hara ◽  
Rumana A. Jahan
Keyword(s):  
Polymer Chain ◽  
Main Chain ◽  
Sodium Bromate ◽  
Bz Reaction ◽  
Initial Concentration ◽  
Covalently Bonded ◽  
Belousov Zhabotinsky Reaction

In this paper, we investigated the effect ofthetemperatureand the initial concentration of sodium bromateon the soluble-insoluble self-oscillation of a nonthermoresponsiveself-oscillatingpolymer chain. The polymer chain consisted of Acrylamide (AM) main-chain covalently bonded to Ru (bpy)3as a catalyst of the Belousov-Zhabotinsky (BZ) reaction. The amplitude of the transmittance self-oscillation is hardly affected by the concentration of sodium bromate and the temperature.

Effect of Substrate Concentrations of the BZ Reaction on Period of Self-Oscillation for Non-Thermoresponsive Polymer Chain

2011 ◽  
Vol 480-481 ◽  
pp. 357-362 ◽  
Author(s):  
Yusuke Hara
Keyword(s):  
Polymer Chain ◽  
Main Chain ◽  
Polymer Concentration ◽  
Solution Viscosity ◽  
Thermoresponsive Polymer ◽  
Bz Reaction ◽  
Ru Catalyst ◽  
Initial Substrate ◽  
Covalently Bonded ◽  
Substrate Concentrations

In this study, effect of the initial substrate concentrations of the Belouzov-Zhabotinsky (BZ) on a period and transmittance self-oscillating behavior for a polymer chain were investigated under the constant temperature condition (T = 20 °C). The polymer chain was composed of a non-thermoresponsive poly-vinylpyrrolidone (PVP) main-chain covalently-bonded to the 10 wt% ruthenium catalyst (Ru(bpy)3) of the BZ reaction. The transmittance self-oscillation originates from the different solubility of the Ru catalyst moiety in the reduced and oxidized state. The waveform and period of the non-thermoresponsive polymer chain was significantly affected by the initial concentration of the BZ substrates. Moreover, as the concentration of the Ru catalyst increased due to the increase in the polymer concentration, the period hardly changed because of the high solution viscosity.

Trasmittance Self-Oscillating Behavior of a Non-Thermoresponsive Polymer Chain Induced by the Belouzov-Zhabotinsky (BZ) Reaction

2011 ◽  
Vol 480-481 ◽  
pp. 369-374 ◽  
Author(s):  
Yusuke Hara
Keyword(s):  
Polymer Chain ◽  
Main Chain ◽  
Ruthenium Catalyst ◽  
The Self ◽  
Thermoresponsive Polymer ◽  
Bz Reaction ◽  
Covalently Bonded ◽  
Selection Of

In this study, the influence of the temperature on the transmittance self-oscillation of a non-thermoresponsive polymer chain was investigated. The polymer chain was composed of a biocompatible and non-thermoresponsive poly-vinylpyrrolidone (PVP) main-chain covalently-bonded to the 10 wt% ruthenium catalyst moiety (Ru(bpy)3) of the BZ reaction. As a result, the amplitude of the transmittance self-oscillation slightly decreased with the increase in the temperature. The period of the transmittance self-oscillation decreased with increasing the temperature in accordance with the Arrenius equation. Therefore, the period of the self-oscillation can be controlled by the selection of the temperature.

Activation Energy of Autonomous Polymer Chains with High LCST

2014 ◽  
Vol 941-944 ◽  
pp. 1212-1215 ◽  
Author(s):  
Yusuke Hara
Keyword(s):  
Activation Energy ◽  
Polymer Chain ◽  
Polymer Chains ◽  
The Novel ◽  
Bz Reaction ◽  
Ru Catalyst

A self-oscillating polymer chain consisting ofN-ethylacrylamide (NEAAm) and a Ru catalyst of the BelousovZhabotinsky (BZ) reaction was prepared. The polymer chain underwent soluble-insoluble self-oscillation induced by the BZ reaction, originating from the differing solubility of the Ru moiety in the reduced and oxidized states. The amplitude of self-oscillation was small compared to that for the polymer chains prepared fromN-Isopropylacrylamide (NIPAAm). The activation energy observed with the novel, NEAAm-based polymer chain was 68 kJ/mol, similar to that found with the NIPAAm-based polymer chain and normal (no Ru catalyst incorporated in the polymer) BZ reaction.

PERIOD-DOUBLING GEOMETRY OF THE BELOUSOV-ZHABOTINSKY REACTION DYNAMICS

1996 ◽  
Vol 06 (07) ◽  
pp. 1267-1279 ◽  
Author(s):  
JICHANG WANG ◽  
F. HYNNE ◽  
P. GRAAE SØRENSEN
Keyword(s):  
Stable Manifold ◽  
Period Doubling ◽  
Quantitative Information ◽  
Stable And Unstable Manifolds ◽  
Bz Reaction ◽  
Positive Orthant ◽  
Model Independent ◽  
Unstable Manifolds ◽  
Belousov Zhabotinsky Reaction ◽  
Concentration Space

The intricate geometry of stable and unstable manifolds of a saddle cycle arising from a super-critical period-doubling bifurcation is explored experimentally for the Belousov-Zhabotinsky (BZ) reaction in a CSTR (Continuous flow Stirred Tank Reactor). We find clear experimental evidence that the stable manifold winds round the stable period-doubled orbit arising at the bifurcation. The stable manifold is probed experimentally by perturbations from the period-doubled limit cycle. The method provides a model-independent experimental test for species essential for the complexity, as well as quantitative information about the geometry of the limit cycles, the associated manifolds, and their embedding in the concentration space. The results are supported by simulations of the experiments with a four-dimensional model of the BZ reaction. Here stable manifold has several branches showing some tendency of curling. However the branches may end on the boundary of the positive orthant of the concentration space.

Self-Oscillating Soluble−Insoluble Changes of a Polymer Chain Including an Oxidizing Agent Induced by the Belousov−Zhabotinsky Reaction

2005 ◽  
Vol 109 (49) ◽  
pp. 23316-23319 ◽  
Author(s):  
Yusuke Hara ◽  
Takamasa Sakai ◽  
Shingo Maeda ◽  
Shuji Hashimoto ◽  
Ryo Yoshida
Keyword(s):  
Polymer Chain ◽  
Oxidizing Agent ◽  
Belousov Zhabotinsky Reaction

Self-Oscillating Gel as Smart Materials

2008 ◽  
Vol 57 ◽  
pp. 1-4 ◽  
Author(s):  
Ryo Yoshida
Keyword(s):  
Smart Materials ◽  
Ph Control ◽  
Control Site ◽  
Biological Condition ◽  
Bz Reaction ◽  
Gel Beads ◽  
Ciliary Motion ◽  
Microfabrication Technique ◽  
External Stimuli ◽  
Linear Polymer Chain

We have developed polymer and gels with an autonomous self-oscillating function by utilizing the Belousov-Zhabotinsky (BZ) reaction. Under the coexistence of the substrates, the polymer undergoes spontaneous cyclic soluble-insoluble changes or swelling-deswelling changes (in the case of gel) without any on-off switching of external stimuli. By using microfabrication technique, ciliary motion actuator or self-walking gel have been demonstrated. Further, in order to realize nano-actuator, the linear polymer chain and the submicrometer-sized gel beads were prepared. By grafting the polymers or arraying the gel beads on the surface of substrates, we have attempted to design self-oscillating surface as nano-conveyer. For application to biomaterials, it is necessary to cause the self-oscillation under biological condition without using non-biorelated BZ substrates. So we attempted to introduce pH-control site and oxidant-supplying site into the polymer. By using the polymer, self-oscillation only in the existence of biorelated organic acid was actually achieved.

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