3-Dimensional Freeform Fabrication of High-Strength Gels by Laser Scanning Irradiation

Hidema, Ruri; Sugita, Keiichi; Furukawa, Hidemitsu

doi:10.1299/kikaia.77.1002

Cited by 15 publications

(8 citation statements)

References 7 publications

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“…3D gel printing and actuator design.-We used a light scanning type 3D gel printer for solution polymerization. [13][14][15][16] The 3D printer is capable of 3D modelling of the hydrogel by locally irradiating UV light and causing a polymerization reaction. This 3D printer was equipped with UV light laser source (Spectra-Physics, Tristar, wavelength 355 nm, maximum power 3 W), sequencer lens (OLYMPUS Corp., MPLN20X), fibre optic cable (THORLABS, SMA-SMA Fiber Patch Cable, Low OH), UV fused silica lens (diameter 6.0 mm, focal length 10 mm) and N-BK7 lens (diameter 6.0 mm, focal length 10 mm).…”

Section: Methodsmentioning

confidence: 99%

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Fully 3D-Printed Hydrogel Actuator for Jellyfish Soft Robots

Takishima

Yoshida

Khosla

et al. 2021

ECS J. Solid State Sci. Technol.

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Recently, interest to develop soft robots that mimic flora and fauna in the natural environment has been growing in order to meet the demand for shortage in labor, working in hazardous environments, disaster management, health care and oceanography. Actuators that are made from soft materials, such as elastomers and hydrogels, are integral components of soft robots. Although, 3D printing is a versatile technique to fabricate prototypes, it is a well-known fact that 3D printing for soft materials is challenging. In this work, we present the fabrication and characterization of 3D-printed hydrogel soft actuator that mimics a jellyfish. The developed actuators consist of three parts; (1) Connector: which is the joint part between the main body of actuator and the inlet tube for air pressure, (2) Box: which is balloon-like inflation part and; (3) Base: which is connected to the Box. The results indicate that the normalized contraction ratio of the 3D-printed actuator is close value to that of moon jellyfish and is applicable to a jellyfish-mimic robot. Furthermore, it is observed that, the relationship between applied air pressure and injected volume is linear without balloon defects.

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Section: Methodsmentioning

confidence: 99%

“…Our group has developed and has studied 3D hydrogel printing techniques. [13][14][15][16] The hydrogel with various shape can be easily modelled by using the 3D hydrogel printing. Previously, robots with 3D-printed electrorheological fluid valve have been developed.…”

mentioning

confidence: 99%

Fully 3D-Printed Hydrogel Actuator for Jellyfish Soft Robots

Takishima

Yoshida

Khosla

et al. 2021

ECS J. Solid State Sci. Technol.

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“…The composition of the 1st gel powder and the 2nd pre-gel solution is shown in Tables 1 and 2. The 1st gel powder and the 2nd pre-gel solution were mixed in a ratio of 1:30 by weight (Hidema, et al, 2011). To control the gelation range during SWIM-ER printing, UV light absorber was added to the P-DN pre-gel solution.…”

Section: Experimental Section 21 Preparation Of P-dn Pre-gel Solutionmentioning

confidence: 99%

“…The first problem is improved by the development of high-strength hydrogels (Okumura and Ito, 2001;Haraguchi and Takehisa, 2002;Gong, et al, 2003;Sakai, et al, 2008) since 2000s. Our group has developed a 3D gel printing system "Soft and Wet Intelligent Matter-Easy Realizer (SWIM-ER)" (Hidema, et al, 2011;Muroi, et al, 2013) to overcome the second problem. We believe that practical application of hydrogels is accelerated by freely molding of high-strength hydrogel using the 3D gel printing.…”

Section: Introductionmentioning

confidence: 99%

Influence of 3D-printing conditions on physical properties of hydrogel objects

Ota

Yoshida

Tase

et al. 2018

Mechanical Engineering Journal

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In this paper, we present the relationship between printing parameters of a 3D gel printer "Soft and Wet Intelligent Matter-Easy Realizer (SWIM-ER)" and mechanical properties of the fabricated gel objects by SWIM-ER. The printer is able to fabricate hydrogel objects by scanning of ultra-violet (UV) light irradiation (photopolymerization). Various hydrogels objects were printed with different scanning velocity of UV light. We measured the water content and mesh sizes of gel objects utilizing Scanning Microscopic Light Scattering (SMILS). Furthermore, we also printed the gel objects with multiple scan rates with constant UV light irradiation energy, and measured sizes of gel objects, and performed the compression test. It was observed that the physical properties of printed hydrogel objects are strongly related with 3D printing parameters (scan velocity and number of scans-scan rate) due to difference in crosslinking density of polymer network.

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“…It made the synthesis of the double network gels much easier. The DN gels prepared by this method were named the particle DN (P-DN) gels (3,4) . The N,N'-methylenbisacrylamide (MBAA) and α-ketoglutaric acid (α-keto) were used as crosslinker and UV initiator, respectively.…”

Section: Photographs Of the Swim-ermentioning

confidence: 99%

Development of Optical 3D Gel Printer for Fabricating Free-Form Soft & Wet Industrial Materials and Evaluation of Printed Double-Network Gels

Muroi

Hidema

Gong

et al. 2013

JMMP

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Gels are kinds of soft and wet materials, having many unique characteristics such as low friction, material permeability, and biocompatibility. In the last decade, the mechanical weakness of the gels has been overcome by the advent of novel high-strength gels, which promises to expand the industrial and medical applications of the soft and wet materials. Here an optical 3D printer was developed to fabricate high-strength gels with free form. For fabricating the gel materials by the printer, one of the strongest gels, called Double-Network (DN) gel, was used. The DN gels were easily prepared by using the grained particle type of the1st gels. The DN gels prepared by this method were named the particle-DN gels. The particles of the 1st gels were mixed with the 2nd pre-gel solution, and the solution was gelled by the irradiated of UV light. In the printer, the laser beam of UV light was lead to the solution through an optical fiber and the scanning of the fiber in the solution was controlled by 3D-CAD. The printer was named Easy Realizer of Soft and Wet Industrial Materials (SWIM-ER). The mechanical properties of the DN gels printed by the SWIM-ER were evaluated.

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3-Dimensional Freeform Fabrication of High-Strength Gels by Laser Scanning Irradiation

Cited by 15 publications

References 7 publications

Fully 3D-Printed Hydrogel Actuator for Jellyfish Soft Robots

Fully 3D-Printed Hydrogel Actuator for Jellyfish Soft Robots

Influence of 3D-printing conditions on physical properties of hydrogel objects

Development of Optical 3D Gel Printer for Fabricating Free-Form Soft & Wet Industrial Materials and Evaluation of Printed Double-Network Gels

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