Chemical and Electrochemical Manipulation of Mechanical Properties in Stimuli-Responsive Copper-Cross-Linked Hydrogels

Harris, Rachel D.; Auletta, Jeffrey T.; Motlagh, S. Amin Mohaghegh; Lawless, Matthew J.; Perri, Nicholas M.; Saxena, Sunil; Weiland, Lisa Mauck; Waldeck, David H.; Clark, William W.; Meyer, Tara Y.

doi:10.1021/mz4004997

Cited by 83 publications

(76 citation statements)

References 38 publications

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“…Molecular switches made of metal ions-organics complexation can enable SMEs by controlling the oxidative state of the metal ions [127,128]. It was found that the complex formed between ferric ions (Fe 3+ ) and phosphate groups was effective in fixing a temporary shape (Fig.…”

Section: Page 21 Of 106mentioning

confidence: 99%

“…Similarly, the complex between copper ions and pyridine ligands was also applied as molecular switches to enable a redox-induced SME since temporary crosslinking complexes could be reversibly formed through controlling oxidative states of copper ions (Cu + versus Cu 2+ ) ( Fig. 9b) [128]. Also of relevance is that the oxidative states of ions can be tuned both chemically and electrochemically.…”

Section: Page 21 Of 106mentioning

confidence: 99%

mentioning

confidence: 99%

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Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Zhao

Xie

2015

Progress in Polymer Science

1,163

749

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Shape memory polymers (SMPs), as a class of programmable stimuliresponsive shape changing polymers, are attracting increasing attention from the standpoint of both fundamental research and technological innovations. Following a brief introduction of the conventional shape memory effect (SME), progress in new shape memory enabling mechanisms and triggering methods, variations of in shape memory forms (shape memory surfaces, hydrogels, and microparticles), new shape memory behavior (multi-SME and two-way-SME), and novel fabrication methods are reviewed. Progress in thermomechanical modeling of SMPs is also presented. Abbreviations:SCPs shape changing polymers; LCEs liquid crystalline elastomers; SMP shape memory polymer; SME shape memory effect; 2W two-way; 1W oneway; T trans transition temperature; T g glass transition temperature; T m melting temperature; T cl liquid crystal cleaning temperature; T d deformation temperature; T f shape fixing temperature; T c crystallization temperature; R f shape stability ratio; R r shape recovery ratio; T sw switching temperature; ε max maximum recoverable strain; σ max maximum recovery stress; SMC shape memory cycle; ε load strain under load; ε fixed strain; T r recovery Page 2 of 106 A c c e p t e d M a n u s c r i p t 2 temperature; ε rec recovered strain; V r strain recovery rate; T σmax temperature corresponding to σ max ; T sw,app apparent switching temperature; PCL poly(ε-caprolactone); SMPU shape memory polyurethane; EMU elemental memory unit; TME temperature memory effect; PU polyurethane; T i liquid-crystal isotropic transition temperature; T v vitrification temperature; CIE crystallization induced elongation; MIC melting induced contraction

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Section: Page 21 Of 106mentioning

confidence: 99%

Section: Page 21 Of 106mentioning

confidence: 99%

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Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Zhao

Xie

2015

Progress in Polymer Science

1,163

749

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“…The focus on this study is primarily to demonstrate the expansion of the spatial domain of a deformed structure due to modulus change. One of the most state-of-the-art smart materials are the Electroplastic elastomer hydrogels (EPEHs) that can reversibly switch between hard and soft states with the application of an electrical potential [17,18]. Unlike conventional intelligent materials, these materials do not exhibit any time response issue, heat-transfer induced phase transformation or heat energy dissipation.…”

Section: Journal Of Engineeringmentioning

confidence: 99%

An Investigation on Shape Morphing by Modulus Variation: Forward Approach

Motlagh

Clark

2014

Journal of Engineering

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Structural shape deformation, in its conventional way, includes applying forces to a fixed-compliance structure to deform it to certain shapes. Rather than addressing shape control in the established way (applying forces to elastically or plastically deform a structure), this work studies the use of shape morphing, which involves combining applied forces and local modulus changes. Specifically in this paper, a simply supported elastic beam that can exhibit variable compliance behavior is selected as the model. This study focuses on the forward approach of morphing, that is, determining possible beam shapes due to the applied force and modulus variability. The goal is to incorporate variable-modulus materials into a structure model and utilize the controllable modulus change to quantify the morphing of the structure with limited actuator numbers, locations, and force levels. The resulting morphed shapes are quantified in terms of various characteristic parameters. The study demonstrates that a larger, and in some cases nonintuitive, space of shapes becomes possible when modulus change is utilized, for the same set of applied forces.

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“…[13][14][15] Electro-responsive hydrogels, as one of the attractive smart hydrogels, can change their physical properties, such as mechanical strength, volume, conductivity, and optical transparency in the presence of electric fields. [16][17][18][19][20][21][22][23][24] Such electrically controlled switch may lead to distinct bacteria adsorption/desorption behaviors of the hydrogels. Therefore, it is possible to use such electro-responsive hydrogels as novel bacteria removal materials.…”

Section: Introductionmentioning

confidence: 99%

Electroresponsive Supramolecular Graphene Oxide Hydrogels for Active Bacteria Adsorption and Removal

Xue¹,

Qin²,

Wu³

et al. 2016

ACS Appl. Mater. Interfaces

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Bacteria contamination in drinking water and medical products can cause severe health problems. However, currently available sterilization methods, mainly based on the size-exclusion mechanism, are typically slow and require the entire contaminated water to pass through the filter. Here, we present an electroresponsive hydrogel based approach for bacteria adsorption and removal. We successfully engineered a series of graphene oxide hydrogels using redox-active ruthenium complexes as noncovalent cross-linkers. The resulting hydrogels can reversibly switch their physical properties in response to the applied electric field along with the changes of oxidation states of the ruthenium ions. The hydrogels display strong bacteria adsorbing capability. A hydrogel of 1 cm(3) can adsorb a maximum of 1 × 10(8) E. coli. The adsorbed bacteria in the hydrogels can then be inactivated by a high voltage electric pulse and removed from the hydrogels subsequently. Owing to the high bacteria removal rate, reusability, and low production cost, these hydrogels represent promising candidates for the emergent sterilization of medical products or large-scale purification of drinking water.

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Chemical and Electrochemical Manipulation of Mechanical Properties in Stimuli-Responsive Copper-Cross-Linked Hydrogels

Cited by 83 publications

References 38 publications

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

Recent progress in shape memory polymer: New behavior, enabling materials, and mechanistic understanding

An Investigation on Shape Morphing by Modulus Variation: Forward Approach

Electroresponsive Supramolecular Graphene Oxide Hydrogels for Active Bacteria Adsorption and Removal

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