Responsive cellulose-hydrogel composite ink for 4D printing

Mulakkal, Manu C.; Trask, Richard S.; Ting, Valeska P.; Seddon, Annela M.

doi:10.1016/j.matdes.2018.09.009

Cited by 182 publications

(97 citation statements)

References 31 publications

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“…Over the past few decades, 3D printing, also known as additive manufacture or robocasting technology, has been developed and applied successfully to fabricate monoliths with controlled 3D shapes by careful placement of material in space. Currently, printing methods are not limited to utilising inks comprised of plastics for art exhibitions and may also employ inks comprised of ceramics, metals, graphene additives, and even stimuli-responsive hydrogel composites [129] for prototyping and industrial applications [130][131][132]. Recently scaffolds [133], membranes [134][135][136], carbons [137], zeolites [138][139][140], aminosilicate adsorbents [141], and heterogeneous catalytic systems [142] by taking advantage of this technique.…”

Section: D Printing Methodsmentioning

confidence: 99%

Hierarchical Metal–Organic Frameworks with Macroporosity: Synthesis, Achievements, and Challenges

et al. 2019

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HIGHLIGHTS• The advantages of macroporous metal-organic frameworks (MOFs) in comparison with micro-and mesoporous MOFs are discussed.• A range of synthetic methods for the fabrication and characterisation of hierarchical MOFs with macroporosity are reviewed.• The applications, advancements, and challenges of each method are compared and assessed in detail.ABSTRACT Introduction of multiple pore size regimes into metalorganic frameworks (MOFs) to form hierarchical porous structures can lead to improved performance of the material in various applications.In many cases, where interactions with bulky molecules are involved, enlarging the pore size of typically microporous MOF adsorbents or MOF catalysts is crucial for enhancing both mass transfer and molecular accessibility. In this review, we examine the range of synthetic strategies which have been reported thus far to prepare hierarchical MOFs or MOF composites with added macroporosity. These fabrication techniques can be either pre-or post-synthetic and include using hard or soft structural template agents, defect formation, routes involving supercritical CO 2 , and 3D printing. We also discuss potential applications and some of the challenges involved with current techniques, which must be addressed if any of these approaches are to be taken forward for industrial applications.

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Section: D Printing Methodsmentioning

confidence: 99%

Hierarchical Metal–Organic Frameworks with Macroporosity: Synthesis, Achievements, and Challenges

et al. 2019

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“…Anisotropy is generally introduced to transformer hydrogels by the addition of fibrils or fibers, nano/macroparticles and sheets, directionally aligned fibrous hydrogel composites, and molecular alignment of polymer chains . Gladman et al developed a hydrogel ink for 3D printing by combining a thermoresponsive cross‐linked acrylamide with stiff cellulose fibrils embedded in it.…”

Section: Principlesmentioning

confidence: 99%

Transformer Hydrogels: A Review

Erol

Pantula

Liu

et al. 2019

Adv Materials Technologies

233

211

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Hydrogels, which are hydrophilic soft porous networks, are an important class of materials of broad relevance to bioanalytical chemistry, soft‐robotics, drug delivery, and regenerative medicine. Transformer hydrogels are micro‐ and mesostructured hydrogels that display a dramatic transformation of shape, form, or dimension with associated changes in function, due to engineered local variations such as in swelling or stiffness, in response to external controls or environmental stimuli. This review describes principles that can be utilized to fabricate transformer hydrogels such as by layering, patterning, or generating anisotropy, and gradients. Transformer hydrogels are classified based on their responsivity to different stimuli such as temperature, electromagnetic fields, chemicals, and biomolecules. A survey of the current research progress suggests applications of transformer hydrogels in biomimetics, soft robotics, microfluidics, tissue engineering, drug delivery, surgery, and biomedical engineering.

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“…Real environmental and atmospheric conditions are however more complex, and changes of temperature are always coupled with variations of humidity. The moisture‐induced actuation of additive manufacturing materials is rarely discussed aside from cases related to the self‐folding hydrogel‐based microactuators or 2 GPa stiff polymer/acrylated monomers hydrogel systems . In recent time natural fiber hygromorph wood/PLA biocomposites with high actuation stiffness and strength have been developed for structural up‐scaled applications, in particular for buildings (cladding/façade, shading systems, and solar tracker).…”

Section: Introductionmentioning

confidence: 99%

Bioinspired Electro‐Thermo‐Hygro Reversible Shape‐Changing Materials by 4D Printing

Duigou

Chabaud

Scarpa

et al. 2019

Adv Funct Materials

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Hygromorph composites are moisture-induced shape-changing materials that are increasingly studied to develop autonomously actuated deployable structures. The morphing mechanism is based on the high affinity for moisture and the hygroexpansive nature of at least one component, combined with a bilayer microstructure. Among available hygromorphs, those consisting of cellulosic or hydrogel material-based actuators trigger fast responses to moisture. Their stiffness however decreases significantly with the moisture content and that restricts their potential application as soft actuators. This work proposes a novel 4D printed multistimuli-responsive structural material based on conductive carbon reinforcements and combined with a moisture sensitive polymer. These 4D printed materials possess a microstructure that provides the capability of natural actuators like pine cones. The actuation of these functional materials could be either triggered passively by the variation of the ambient moisture, or by electroheating, with the latter leading to the control of the moisture content in initially wet samples via Joule effects. This new class of functional materials shows an increase of the actuation speed by a factor 10 compared to other existing hygromorphs with the same responsiveness. When the electrical heating is turned off, passive cooling and moisture driven actuation is triggered in a full reversible mode.

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Responsive cellulose-hydrogel composite ink for 4D printing

Cited by 182 publications

References 31 publications

Hierarchical Metal–Organic Frameworks with Macroporosity: Synthesis, Achievements, and Challenges

Hierarchical Metal–Organic Frameworks with Macroporosity: Synthesis, Achievements, and Challenges

Transformer Hydrogels: A Review

Bioinspired Electro‐Thermo‐Hygro Reversible Shape‐Changing Materials by 4D Printing

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