3D Printing of Transparent Silicone Elastomers (Adv. Mater. Technol. 5/2022)

Ford, Michael J.; Loeb, Colin K.; Pérez, Lemuel X. Pérez; Gammon, Stuart A.; Guzorek, Steven; Gemeda, Hawi B.; Golobic, Alexandra M.; Honnell, August; Erspamer, Justin; Duoss, Eric B.; Wilson, Thomas S.; Lenhardt, Jeremy M.

doi:10.1002/admt.202270020

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These shortcomings limit the range of mechanical properties a given elastomer formulation can attain, as summarized in Figure a. [ 2,35,46–54 ] By contrast, the stiffness and ultimate tensile strain of our DNGE can be over a wide range by independently adjusting the composition of the microparticles and the 2 nd elastomer network. Indeed, the range of Young's moduli and ultimate tensile strains our 3D printable material can attain exceeds that of any previously published 3D printable elastomer system, as summarized in the Ashby plot in Figure 8a.…”

Section: Resultsmentioning

confidence: 99%

“…DNGEs with different mechanical properties. a) Ashby plot of bulk elastomers that have been 3D printed through DIW from precursor solutions that have (filled diamonds) [ 2,35,47,50,51,53 ] and have not been (empty diamonds) [ 46,48,49,52,54 ] modified with nanoparticles (NPs). The DNGE system introduced here (green shaded area) can span an unprecedented range of stiffnesses and ultimate tensile strains.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

3D Printing of Double Network Granular Elastomers with Locally Varying Mechanical Properties

Baur,

Tiberghien,

Amstad

2024

Advanced Materials

View full text Add to dashboard Cite

Fast advances in the design of soft actuators and robots demand for new soft materials whose mechanical properties can be changed over short length scales. Elastomers can be formulated as highly stretchable or rather stiff materials and hence, are attractive for these applications. They are most frequently casted such that their composition cannot be changed over short length scales. A method that allows to locally change the composition of elastomers on hundreds of micrometer lengths scales is direct ink writing (DIW). Unfortunately, in the absence of rheomodifiers most elastomer precursors cannot be printed through DIW. Here, we introduce 3D printable double network granular elastomers (DNGEs) whose ultimate tensile strain and stiffness can be varied over an unprecedented range. We leverage the 3D printability of these materials to produce an elastomer finger containing rigid bones that are surrounded by a soft skin. Similarly, we leverage the rheological properties of the microparticle‐based precursors to cast elastomer slabs with locally varying stiffnesses that deform and twist in a pre‐defined fashion. We foresee these DNGEs to open up new avenues in the design of the next generation of smart wearables, strain sensors, prosthesis, soft actuators and robots.This article is protected by copyright. All rights reserved

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

3D Printing of Double Network Granular Elastomers with Locally Varying Mechanical Properties

Baur,

Tiberghien,

Amstad

2024

Advanced Materials

View full text Add to dashboard Cite

show abstract

“…Because of its large specific surface area and high stability, it has been widely used in various fields as an additive in recent years. Many researchers add fumed silica to silicon elastic ink, which gives it superior rheology and printability 34,36 . In this paper, fumed silica was used as the rheological modifier of DIW ink.…”

Section: Resultsmentioning

confidence: 99%

3D printable and stretchable PVA‐PAAm dual network hydrogel with conductivities for wearable sensors

Wei

Duan

Yao

2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

Conductive hydrogel has broad potential applications in wearable sensors and flexible electronic devices. However, due to the complicated and restrictive mold‐casting process, the manufacture of hydrogel‐based sensors is still facing great challenges. In this paper, we adopt direct inkjet printing (DIW) technology to fabricate three‐dimensional structures of chemically and physically cross‐linked hydrogels by integrating fumed silica as a rheological modifier into crosslinked poly(vinyl alcohol)/poly(acrylamide) (PVA/PAAm) network. Fumed silica not only enables hydrogels with excellent rheological properties, but also provides more hydrogen bond crosslinking sites, further improving mechanical properties. Meanwhile, calcium chloride (CaCl2) is supplemented to construct conductive channels in the hydrogel, which powers the hydrogel with good conductivity and strain sensitivity. The sensor assembled from 3D printed hydrogel shows cycle stability and accurate recognition ability in detecting mechanical deformation and various human movements (for example knee bending and frown). This work extends the application of 3D printing hydrogel in the field of wearable devices.

show abstract

“…[9] To address these trade-offs in PDMS-based inks, different strategies have been applied, such as printing into support baths, adding wax particles, thiols, PEG, glycerol, cross-linked PDMS microspheres instead of inorganic fillers, commercial thixotropic additives, or complex custom-made additives. [3,[29][30][31][32][33][34][35] However, thus far, none of these strategies has been employed for DIW of DETs. While some of these strategies might work for DET applications, liquid additives and solvents are often attributed to negatively affecting the electrical breakdown field or to increase aging effects, such as the leaking of liquids from the crosslinked elastomer.…”

Section: Introductionmentioning

confidence: 99%

Polysiloxane Inks for Multimaterial 3d Printing of High‐Permittivity Dielectric Elastomers

Danner,

Pleij,

Siqueira

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

Dielectric elastomer transducers (DET) are promising candidates for electrically‐driven soft robotics. However, the high viscosity and low yield stress of DET formulations prohibit 3D printing, the most common manufacturing method for designer soft actuators. DET inks optimized for direct ink writing (DIW) produce elastomers with high stiffness and mechanical losses, diminishing the utility of DET actuators. To address the antagonistic nature of processing and performance constraints, principles of capillary suspensions are used to engineer DIW DET inks. By blending two immiscible polysiloxane liquids with a filler, a capillary ink suspension is obtained, in which the ink rheology can be tuned independently of the elastomer electromechanical properties. Rheometry is performed to measure and optimize processibility as a function of filler and secondary liquid fraction. Including polar polysiloxanes as the secondary liquid produces a printed elastomer exhibiting a four‐fold permittivity increase over commercial polydimethylsiloxane. The characterization and multimaterial printing into layered DET devices demonstrates that the immiscible capillary suspension improves the processability of the inks and enhances the properties of the elastomers, enabling actuation of the devices at comparatively low voltages. It is anticipated that this formulation approach will allow soft robotics to harness the full potential of DETs.

show abstract

3D Printing of Transparent Silicone Elastomers (Adv. Mater. Technol. 5/2022)

Cited by 3 publications

References 0 publications

3D Printing of Double Network Granular Elastomers with Locally Varying Mechanical Properties

3D Printing of Double Network Granular Elastomers with Locally Varying Mechanical Properties

3D printable and stretchable PVA‐PAAm dual network hydrogel with conductivities for wearable sensors

Polysiloxane Inks for Multimaterial 3d Printing of High‐Permittivity Dielectric Elastomers

Contact Info

Product

Resources

About