Acoustophoretic Liquefaction for 3D Printing Ultrahigh‐Viscosity Nanoparticle Suspensions

Liu, Zheng; Pan, Wenhao; Wang, Kaiyang; Matia, Yoav; Xu, Artemis; Barreiros, José Augusto Lima; Darkes-Burkey, Cameron; Giannelis, Emmanuel P.; Mengüç, Yiğit; Shepherd, Robert F.; Wallin, Thomas J.

doi:10.1002/adma.202106183

Cited by 23 publications

(22 citation statements)

References 39 publications

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“…At the same time, resins with higher loadings are too viscous to recover the vat surface after layer irradiation with just flow; nonetheless, printing is still possible if a more advanced VP setup is used (e.g., wiper, ultrasound, etc. ). , Such a drastic increase in viscosities of the filled resins relates to the extremely high aspect ratio and present entanglements of the SWCNT fibrils. Despite SWCNT loadings above 0.3 wt % making the printing process more complicated, higher loadings also lead to higher conductivity values (discussed later in the article).…”

Section: Resultsmentioning

confidence: 99%

Three Dimensionally Printed Biobased Electrodes: Ionic Liquid and Single-Walled Carbon Nanotube Hybrids in a Vegetable Oil Matrix for Soft Robotics

Jurinovs

Barkāne

Platnieks

et al. 2023

ACS Appl. Polym. Mater.

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The field of conductive polymer composites has been growing rapidly in recent years due to the increased demand for cutting-edge applications, such as sensors, soft robots, and other high-tech devices. Despite developing some biobased components, biobased solutions that yield working prototypes are still lacking. Herein, a method for making highly biobased, electroconductive, and 3D printable composites (electrodes) is presented. A formulation composed of acrylate-functionalized rapeseed oil (70 wt %) with the addition of a photoinitiator, reactive monomer, 1-ethyl-3-methylimidazolium acetate (ionic liquid (IL)), and single-walled carbon nanotubes (SWCNT) is reported. The proposed approach eliminates the use of solvents. Combining IL with SWCNTs resulted in highly conductive (up to 38 S m–1) biobased electrodes. The in-depth conductivity analysis was done through impedance spectroscopy, 4-point resistivity, and electroconducting atomic force microscopy. The prepared resins enable the creation of complex structures with exceptional precision and accuracy, thoroughly evaluated with optical and scanning electron microscopy. Biobased electrodes created by 3D printing have mechanical qualities like stretchability and flexibility, which make them a suitable replacement for traditional electrodes in soft robotics and flexible sensors. Furthermore, a fully 3D-printed soft-robotic actuator with performance comparable to that of commonly used petroleum-based alternatives was developed.

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Section: Resultsmentioning

confidence: 99%

Three Dimensionally Printed Biobased Electrodes: Ionic Liquid and Single-Walled Carbon Nanotube Hybrids in a Vegetable Oil Matrix for Soft Robotics

Jurinovs

Barkāne

Platnieks

et al. 2023

ACS Appl. Polym. Mater.

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“…"Softness" has been defined as "draping" for fabrics from a structural aspect 35 and "viscosity" for fluids from a flowing, dynamic aspect. 36 However, neither is appropriate to describe viscoelastic polymeric soft matters and soft biological tissues due to their hierarchical structures, hydration, inhomogeneous surface, or complex compositions. Herein, we define "softness" for materials having elastic modulus ≤1 MPa.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Bridging the Gap in Ashby’s Map for Soft Material Properties for Tissue Engineering

Lou

Paolino

Agarwal

2023

ACS Appl. Mater. Interfaces

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Ashby’s map’s role in rationally selecting materials for optimal performance is well-established in traditional engineering applications. However, there is a major gap in Ashby’s maps in selecting materials for tissue engineering, which are very soft with an elastic modulus of less than 100 kPa. To fill the gap, we create an elastic modulus database to effectively connect soft engineering materials with biological tissues such as the cardiac, kidney, liver, intestine, cartilage, and brain. This soft engineering material mechanical property database is created for widely applied agarose hydrogels based on big-data screening and experiments conducted using ultra-low-concentration (0.01–0.5 wt %) hydrogels. Based on that, an experimental and analysis protocol is established for evaluating the elastic modulus of ultra-soft engineering materials. Overall, we built a mechanical bridge connecting soft matter and tissue engineering by fine-tuning the agarose hydrogel concentration. Meanwhile, a soft matter scale (degree of softness) is established to enable the manufacturing of implantable bio-scaffolds for tissue engineering.

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“…Further, a surface transducer is integrated into the base of the resin vat to enhance the resin's flow property with yield stress property during printing, called the acoustic liquefaction printing approach. [ 73 ] This method mainly employs the shear‐thinning property of resin composed of polymer‐particle suspensions. In situ, the transducer can control the high‐viscosity resin's rheological properties by regulating the shear rate, where ultrahigh‐viscosity resin can be printed.…”

Section: Interfacial Regulation For Printing Optimizationmentioning

confidence: 99%

Interfacial Regulation for 3D Printing based on Slice‐Based Photopolymerization

Song

Dong

2023

Advanced Materials

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3D printing, also known as additive manufacturing, can turn computer‐aided designs into delicate structures directly and on demand by eliminating expensive molds, dies, or lithographic masks. Among the various technical forms, light‐based 3D printing mainly involved the control of polymer‐based matter fabrication and realized a field of manufacturing with high tunability of printing format, speed, and precision. Emerging slice‐ and light‐based 3D‐printing methods have prosperously advanced in recent years but still present challenges to the versatility of printing continuity, printing process, and printing details control. Herein, the field of slice‐ and light‐based 3D printing is discussed and summarized from the view of interfacial regulation strategies to improve the printing continuity, printing process control, and the character of printed results, and several potential strategies to construct complex 3D structures of distinct characteristics with extra external fields, which are favorable for the further improvement and development of 3D printing, are proposed.

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Acoustophoretic Liquefaction for 3D Printing Ultrahigh‐Viscosity Nanoparticle Suspensions

Cited by 23 publications

References 39 publications

Three Dimensionally Printed Biobased Electrodes: Ionic Liquid and Single-Walled Carbon Nanotube Hybrids in a Vegetable Oil Matrix for Soft Robotics

Three Dimensionally Printed Biobased Electrodes: Ionic Liquid and Single-Walled Carbon Nanotube Hybrids in a Vegetable Oil Matrix for Soft Robotics

Bridging the Gap in Ashby’s Map for Soft Material Properties for Tissue Engineering

Interfacial Regulation for 3D Printing based on Slice‐Based Photopolymerization

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