Self-oscillatory systems based on polymer gels

Konotop, I. Yu.; Nasimova, I. R.; Rambidi, N. G.; Khokhlov, Alexei R.

doi:10.1134/s1560090409090097

Cited by 20 publications

(21 citation statements)

References 21 publications

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“…To obtain Figs. 1B-C, we synthesized the polyacrylamide-silica gel composite containing electrostatically bound ferroin as described by Konotop et al 10 Then, the gel was cut into a disc of 8 mm diameter (Fig. 1B) and a square of 3.6 mm width (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The gel was washed with water to remove unbound ferroin. 10 All reagents were obtained from Sigma-Aldrich.…”

Section: Synthesis Of Polyacrylamide-silica Gel Containing Ferroinmentioning

confidence: 99%

“…In contrast, Yoshida et al and Konotop et al have synthesized gels capable of undergoing autonomous, periodic changes in both volume and color in the absence of continuous external perturbation. [8][9][10] The spontaneous nature of these chemomechanical oscillations is reminiscent of biological processes such as cardiac rhythms. However, the origin of this synthetic functionality is the Belousov-Zhabotinsky (BZ) reaction, a complex but well-established self-oscillating chemical reaction that is characterized by oxidation of an organic acid substrate in the presence of a strong acid and a transition-metal catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Shape- and size-dependent patterns in self-oscillating polymer gels

et al. 2011

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Section: Resultsmentioning

confidence: 99%

“…The gel was washed with water to remove unbound ferroin. 10 All reagents were obtained from Sigma-Aldrich.…”

Section: Synthesis Of Polyacrylamide-silica Gel Containing Ferroinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shape- and size-dependent patterns in self-oscillating polymer gels

et al. 2011

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“…These additional cross-links are reversible; they break when the catalyst is in the reduced state so that the gel re-swells back to its original size. [23][24][25] While these newly synthesized BZ gel systems hold great promise, in this review, we focus on the more studied NIPAAm-based BZ gels.…”

Section: Introductionmentioning

confidence: 99%

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

et al. 2013

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Species ranging from single-cell organisms to social insects can undergo auto-chemotaxis, where the entities move towards a chemo-attractant that they themselves emit. Polymer gels undergoing the self-oscillating Belousov-Zhabotinsky (BZ) reaction exhibit autonomous, periodic pulsations, which produce chemical species collectively referred to as the activator. The diffusion of this activator into the surrounding solution affects the dynamic behavior of neighboring BZ gels and hence, the BZ gels not only emit, but also respond to self-generated chemical gradients. This review describes recent experimental and computational studies that reveal how this biomimetic behavior effectively allows neighboring BZ gels to undergo cooperative, self-propelled motion. These distinctive properties of the BZ gels provide a route for creating reconfigurable materials that autonomously communicate with neighboring units and thereby actively participate in constructing the desired structures.

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“…Interest in integrating these valuable properties of polypyridine metal complexes into materials and devices gave rise to research in bipyridine‐containing polymer ligands, as well as metallopolymers, coordination polymers, supramolecular polymers, and crosslinked polymer gels containing bipyridine moieties . The targeted applications and research areas include, among others, electroluminescent, electrochromic, and photoluminescent materials,[9b,10,11] sensors,[9b,12] and chemomechanically active self‐oscillating gels …”

Section: Introductionmentioning

confidence: 99%

Inverting the Swelling Trends in Modular Self‐Oscillating Gels Crosslinked by Redox‐Active Metal Bipyridine Complexes

Aizenberg

Okeyoshi

Aizenberg

2017

Adv Funct Materials

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The developing field of active, stimuli-responsive materials is in need for new dynamic architectures that may offer unprecedented chemomechanical switching mechanisms. Toward this goal, syntheses of polymerizable bipyridine ligands, bis(4-vinylbenzyl)[2,2′-bipyridine]-4,4′-dicarboxylate and N4,N4′-bis(4-vinylphenyl)-2,2′-bipyridine-4,4′-dicarboxamide, and a number of redox-active Ruthenium(II) and Iron(II) complexes with them are reported. Detailed characterizations by NMR, Fourier transform infrared spectroscopy, high-resolution mass-spectrometry, X-ray, and cyclic voltammetry show that the topology of these molecules allows them to serve as both comonomers and crosslinkers in polymerization reactions. Electronic properties of the ligands are tunable by choosing carboxylate-or carboxamido-linkages between the core and the vinylaryl moieties, leading to a library of Ru and Fe complexes with the M(III)/M(II) standard redox potentials suitable for catalyzing self-oscillating Belousov-Zhabotinskii (BZ) reaction. New poly(Nisopropylacrylamide)-based redox-responsive functional gels containing hydrophilic comonomers, which have been prepared using representative Ru bpy complexes as both a crosslinker and redox-active catalyst, exhibit a unique feature: their swelling/contraction mode switches its dependence on the oxidation state of the Ru center, upon changing the ratio of comonomers in the hybrid gel network. The BZ self-oscillations of such crosslinked hydrogels have been observed and quantified for both supported film and freestanding gel samples, demonstrating their potential as chemomechanically active modules for new functional materials.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adfm.201704205.Ruthenium complexes with polypyridine ligand core, in particular, have occupied a significant place in this body of work, in big part due to the fact that they have been recognized to be useful in a wide variety of applications, which rely on their chemical stability, as well as a unique combination of photochemical, electrochemical, and photophysical properties. Among many potential applications that have emerged over the years, some recent examples include mononuclear water oxidation catalysis, [3] light-emitting electrochemical cells, [4] photoredox catalysis coupled with organocatalysis, [5] light-activated anticancer drugs, [6] and dye-sensitized solar cells. [7,8] Interest in integrating these valuable properties of polypyridine metal complexes into materials and devices gave rise to research in bipyridine-containing polymer ligands, as well as metallopolymers, coordination polymers, supramolecular polymers, and crosslinked polymer gels containing bipyridine moieties. [9] The targeted applications and research areas include, among others, electroluminescent, electrochromic, and photoluminescent materials, [9b,10,11] sensors, [9b,12] and chemomechanically active self-oscillating gels. [13][14][15][16] Interdisciplinary field of development and ...

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Self-oscillatory systems based on polymer gels

Cited by 20 publications

References 21 publications

Shape- and size-dependent patterns in self-oscillating polymer gels

Shape- and size-dependent patterns in self-oscillating polymer gels

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

Inverting the Swelling Trends in Modular Self‐Oscillating Gels Crosslinked by Redox‐Active Metal Bipyridine Complexes

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