UV patternable thin film chemistry for shape and functionally versatile self-oscillating gels

Yuan, Peixi; Kuksenok, Olga; Gross, Dustin E.; Balazs, Anna C.; Moore, Jeffrey S.; Nuzzo, Ralph G.

doi:10.1039/c2sm27100a

Cited by 57 publications

(76 citation statements)

References 51 publications

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“…This model combines a finite element approach for the spatial discretization of the equations of the gel elastodynamics and a finite difference approximation for modeling reaction‐diffusion equations. The findings from a number of computational studies using the gLSM agree with corresponding experimental results,, making this approach effective in simulating the behavior of a variety of chemo‐responsive gels.…”

Section: Methodology: Gel Lattice Spring Modelsupporting

confidence: 60%

Phase Transitions and Pattern Formation in Chemo‐Responsive Gels and Composites

Xiong

Dayal

Balazs

et al. 2018

Israel Journal of Chemistry

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Design of multifunctional materials often requires the chemical functionalization enabling the material to respond to a variety of stimuli. Herein, we focus on modeling of functionalized chemo‐responsive gels and composites; functionalization alters the volume phase transitions allowing system to undergo structural reconfiguration. For instance, we consider the volume phase transitions in photo‐sensitive hydrogels functionalized with two different types of chromophores that either alter the hydrophobicity of the illuminated sample or cause these samples to heat up. We then focus on gels that are driven by the oscillatory Belousov‐Zhabotinsky reaction and show that chemically mediated interactions among these gels drive them to self‐aggregate in a well‐defined manner. Finally, we focus on the self‐oscillating composite that does not contain oscillatory chemically reactions. In all these examples, effective control over the volume phase transitions is achieved through the combination of chemical functionalization and external stimuli, extending the potential utility of the host materials.

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Section: Methodology: Gel Lattice Spring Modelsupporting

confidence: 60%

Phase Transitions and Pattern Formation in Chemo‐Responsive Gels and Composites

Xiong

Dayal

Balazs

et al. 2018

Israel Journal of Chemistry

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“…Most recently, we further modified our gLSM model to capture the behavior of novel PAAm-based self-oscillating BZ gels, in which the oxidation of the catalysts leads to a deswelling of the sample due to the formation of additional reversible cross-links. 25 Hence, the gLSM 55,56 has proven to be a powerful approach for predicting the behavior of these self-oscillating gels.…”

Section: Dynamics Of the Bz Gelsmentioning

confidence: 99%

“…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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“…In this way, bending of the fins stops the reaction, allowing the structure to cool and resurrect, leading to sustained oscillations. Stimuli‐responsive hydrogels are ideal for creating chemomechanical feedback loops, as volume changes, in turn, influence mass transport and chemical reaction rates, for example, in self‐oscillating gels and rhythmic drug‐release systems . Other types of chemomechanical feedback can include self‐shadowing, as has been demonstrated for light‐responsive liquid‐crystalline elastomer thin‐films (Figure c‐ii) .…”

Section: Creating Pairs Of Opposing Interactionsmentioning

confidence: 99%

“…Chemical mini‐homeostatic modules span length scales through diffusion of reagents, intermediates, and products; if unstirred, oscillatory reaction systems create travelling waves and form patterns through diffusion of reagents, intermediates, and products. Self‐oscillating gels rely on these features for chemomechanical transduction. The BZ reaction is coupled through covalent attachment of the redox catalyst to a stimuli‐responsive polymer.…”

Section: Creating Pairs Of Opposing Interactionsmentioning

confidence: 99%

Viewpoint: Homeostasis as Inspiration—Toward Interactive Materials

2020

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are driven by homeostasis working in microcosm: modules of "mini-homeostasis" in which one component responds to a stimulus and another opposes the response, driving the module to restore its initial state. The coupling of responsive and restoring processes ensures self-regulation, but also allows for an unexpected consequence: perturbations of these modules can trigger various, nontrivial behaviors. Hormones and other stimuli can change heartbeat patterns and rhythms, blue light and chemicals can shorten or lengthen periods of cellular clocks, while the earth's orbit shapes seasonal weather patterns.Mini-homeostasis modules naturally couple a variety of physical and chemical processes, which often operate on and across different spatial and temporal scales. For example, locally induced gradients in ocean temperature or salinity are counteracted by global currents. The diversity of the module's responses to perturbations depends on the nature of the opposing processes and on the type of perturbation. When the initial response and the restoring force work across different length and time scales, the interactive behavior becomes particularly interesting and can include all kinds of patterns, dynamics, and complex kinetic phenomena. This interactivity, a hitherto underexplored aspect of homeostasis, is inspiring for materials design not only for the ability to program and create dynamic behavior, but also because it shows how such behaviors-resulting from the restoring aspect of mini-homeostasis-could potentially be mechanistically linked to resilience. Mini-homeostasis implemented in synthetic materials could thus produce a diverse set

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UV patternable thin film chemistry for shape and functionally versatile self-oscillating gels

Cited by 57 publications

References 51 publications

Phase Transitions and Pattern Formation in Chemo‐Responsive Gels and Composites

Phase Transitions and Pattern Formation in Chemo‐Responsive Gels and Composites

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

Viewpoint: Homeostasis as Inspiration—Toward Interactive Materials

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