Supramolecular gelation controlled by an iodine clock

Riedel, Solenn; Schweizer, T.; Smith-Mannschott, Katrina; Dufresne, Eric R.; Panzarasa, Guido

doi:10.1039/d0sm02285c

Cited by 13 publications

(18 citation statements)

References 64 publications

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“…As can be seen from Figure 2b, the storage modulus suddenly increases when the iodine clock strikes, and quickly ' reaches its maximum value. How sudden this sol-gel transition is can be best appreciated by comparing it with the one observed for the IPT-PVA system 25 (Figure S4). In both systems the storage modulus increased of about four orders of ′ magnitude after the iodine clock struck, but in the iodate-HMS- Please do not adjust margins Please do not adjust margins PVA system this change happened much faster compared to the IPT-PVA one.…”

Section: Resultsmentioning

confidence: 99%

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Stable and transient self-propagating supramolecular gelation

Riedel

Panzarasa

2021

Mol. Syst. Des. Eng.

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Section: Resultsmentioning

confidence: 99%

“…δgluconolactone 22,23 ), or pH-clocks 24 to trigger sol-gel transitions. We recently described an alternative approach to program gelation in time by means of supramolecular complex formation 25 . "Iodine clocks", such as the iodide-persulfatethiosulfate (IPT) system, generate iodine ‡ as a product after an initial lagtime.…”

Section: Introductionmentioning

confidence: 99%

Stable and transient self-propagating supramolecular gelation

Riedel

Panzarasa

2021

Mol. Syst. Des. Eng.

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“…The design of artificial dissipative self-assembly systems is a way to mimic these processes and, as such, is one of the most attractive and challenging fields of research in contemporary materials science [33]. Of the different clock reactions that have been applied to colloidal and soft materials to make programmable autonomous dissipative systems [34][35][36][37][38][39][40][41][42], here the focus will be given to iodine-based ones.…”

Section: Applications Of Iodine Clocks To Materials Systemsmentioning

confidence: 99%

Iodine clocks: applications and untapped opportunities in materials science

Panzarasa

2022

Reac Kinet Mech Cat

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Iodine clocks are fascinating nonlinear chemical systems with a glorious past and a promising future. The dynamic removal of iodine from these systems by different means can have important consequences for their reaction dynamics, and could be exploited for time-controlled autonomous dissipative self-assembly. Here, the untapped opportunities offered by iodine clocks for materials science, especially for the time-programming of supramolecular assembly and sol–gel transition, are reviewed and discussed with the hope of arousing the interest on the subject and stimulating new research directions.

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“…In recent years, the application of systems exhibiting chemical clock type behavior in the material design and driving the self-assembly of various building blocks has gained much attention. A key engineering issue is that the clock time (induction period) and the final concentration of the product (e.g., H + ) can be easily adjusted by the initial concentration of the reagents and experimental conditions (e.g., temperature) [5][6][7][8][9]. Predominantly reactions showing chemical clock type of behavior are based on reactive inorganic compounds (e.g., sulfite, bromate) and non-biocompatible reagents (e.g., formaldehyde).…”

Section: Introductionmentioning

confidence: 99%

Inhibition of the urea-urease reaction by the components of the zeolite imidazole frameworks-8 and the formation of urease-zinc-imidazole hybrid compound

Német

Miele

Schuszter

et al. 2022

Reac Kinet Mech Cat

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In the past decade, much effort has been devoted to using chemical clock-type reactions in material design and driving the self-assembly of various building blocks. Urea-urease enzymatic reaction has chemical pH clock behavior in an unbuffered medium, in which the induction time and the final pH can be programmed by the concentrations of the reagents. The urea-urease reaction can offer a new alternative in material synthesis, where the pH and its course in time are crucial factors in the synthesis. However, before using it in any synthesis method, it is important to investigate the possible effects of the reagents on the enzymatic reaction. Here we investigate the effect of the reagents of the zeolite imidazole framework-8 (zinc ions and 2-methylimidazole) on the urea-urease reaction. We have chosen the zeolite imidazole framework-8 because its formation serves as a model reaction for the formation of other metal–organic frameworks. We found that, besides the inhibition effect of the zinc ions which is well-known in the literature, 2-methylimidazole inhibits the enzymatic reaction as well. In addition to the observed inhibition effect, we report the formation of a hybrid urease-zinc-2-methylimidazole hybrid material. To support the inhibition effect, we developed a kinetic model which reproduced qualitatively the experimentally observed kinetic curves.

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Supramolecular gelation controlled by an iodine clock

Abstract: The sol–gel transition and the mechanical properties of a supramolecular poly(vinyl alcohol)–iodine complex can be tuned in time thanks to an “iodine clock”.

Cited by 13 publications

References 64 publications

Stable and transient self-propagating supramolecular gelation

Stable and transient self-propagating supramolecular gelation

Iodine clocks: applications and untapped opportunities in materials science

Inhibition of the urea-urease reaction by the components of the zeolite imidazole frameworks-8 and the formation of urease-zinc-imidazole hybrid compound

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