A macroporous smart gel based on a pH-sensitive polyacrylic polymer for the development of large size artificial muscles with linear contraction

Mansard, Vincent

doi:10.1039/d1sm01078f

Cited by 6 publications

(10 citation statements)

References 73 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Particles were first sintered at 185 °C for 8 h. Sintering ensured a solid contact between particles in order to obtain interconnected pores. The packing of spherical particles was naturally dense, and the density of the template was measured to be about 60%, in agreement with a previous study …”

Section: Resultssupporting

confidence: 90%

“…Furthermore, previous work studied an MP gel made of poly(acrylic acid) (pAA) produced with the same protocol�and therefore presumably with the same porous structure. 53 pAA MP gels showed the modulus ratio E bulk /E porous = 6, which is in agreement with eq 1.…”

Section: Acs Appliedsupporting

confidence: 87%

“…Creation of macroporosity into the gel highly improved its robustness, as observed previously for another gel. 53 However, most materials are more fragile when porosity is added.…”

Section: Discussionmentioning

confidence: 99%

“…The packing of spherical particles was naturally dense, and the density of the template was measured to be about 60%, in agreement with a previous study. 53 To obtain a gel with low porosity (LP gel), we used a second type of template made of shellac fibers. We produced microfibers (diameter 12 μm) by melt spinning 41 (Figure 2a).…”

Section: Characterization Of Mp Gelmentioning

confidence: 99%

“…41,53 Macroporous gels (MP gels) with pore sizes of about 10−100 μm in diameter show a fast enough reaction for soft actuation. Thus, many methods have been developed for induction of macroporosity on hydrogels such as incorporation of sacrificial templates, 41,53,54 sacrificial additives (e.g., poly(ethylene glycol)), 55 or solvent freezing. 45,52,56,57 Freezing the solvent contained in the gel offers a quick way to generate pores.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Development of a Soft Actuator from Fast Swelling Macroporous PNIPAM Gels for Smart Braille Device Applications in Haptic Technology

Yilmaz

Chaabane

Mansard

2023

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

The development of a cost-efficient braille device is a crucial challenge in haptic technology to improve the integration of visually impaired people. Exclusion of any group threatens the proper functioning of society. Commercially available braille devices still utilize piezoelectric actuators, which are expensive and bulky. The challenge of a more adapted braille device lies in the integration of a high number of actuatorson a millimeter scalein order to independently move a matrix of pins acting as tactile cues. Unfortunately, no actuation strategy has been adapted to tackle this challenge. In this study, we develop a soft actuator based on a thermosensitive poly(N-isopropylacrylamide) (PNIPAM) gel. We introduce macroporosity to the gel (pores of 10 to 100 μm). It overcomes the diffusionwhich is the limiting kinetic factorand accelerates the gel response time from hours for the bulk gel to seconds for the macroporous gel. We study the properties of porous gels with various porosities. We also compare a mechanically reinforced nanocomposite gel (made of PNIPAM and Laponite clay) to a “classic” gel. As a result, we develop a fast-actuating gel with high cyclic performance. We then develop a single-pin braille setup, where actuation is controlled thanks to a swift temperature control of a macroporous gel cylinder. This new strategy offers a very promising actuation technology. It offers a simple and cost-efficient alternative to the current braille devices.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Acs Appliedsupporting

confidence: 87%

“…Creation of macroporosity into the gel highly improved its robustness, as observed previously for another gel. 53 However, most materials are more fragile when porosity is added.…”

Section: Discussionmentioning

confidence: 99%

Section: Characterization Of Mp Gelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Development of a Soft Actuator from Fast Swelling Macroporous PNIPAM Gels for Smart Braille Device Applications in Haptic Technology

Yilmaz

Chaabane

Mansard

2023

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

Plant‐Like Tropisms in Artificial Muscles

et al. 2023

View full text Add to dashboard Cite

Helical plants have the ability of tropisms to respond to natural stimuli, and biomimicry of such helical shapes into artificial muscles has been vastly popular. However, the shape‐mimicked actuators only respond to artificially provided stimulus, they are not adaptive to variable natural conditions, thus being unsuitable for real‐life applications where on‐demand, autonomous operations are required. Novel artificial muscles made of hierarchically patterned helically wound yarns that are self‐adaptive to environmental humidity and temperature changes are demonstrated here. Unlike shape‐mimicked artificial muscles, a unique microstructural biomimicking approach is adopted, where the muscle yarns can effectively replicate the hydrotropism and thermotropism of helical plants to their microfibril level using plant‐like microstructural memories. Large strokes, with rapid movement, are obtained when the individual microfilament of yarn is inlaid with hydrogel and further twisted into a coil‐shaped hierarchical structure. The developed artificial muscle provides an average actuation speed of ≈5.2% s−1 at expansion and ≈3.1% s−1 at contraction cycles, being the fastest amongst previously demonstrated actuators of similar type. It is demonstrated that these muscle yarns can autonomously close a window in wet climates. The building block yarns are washable without any material degradation, making them suitable for smart, reusable textile and soft robotic devices.

show abstract

Synthesis and properties of environmentally friendly double‐network fire fighting gel: Based on natural polymer/industrial solid waste

Zhang

et al. 2022

J of Applied Polymer Sci

View full text Add to dashboard Cite

In this paper, a new kind of environmental friendly double‐network gel material was prepared. The first network structure was formed by the graft copolymerization of sodium lignosulfonate (LS) and acrylic acid (AA), and the second network structure was formed by the chelation reaction of sodium alginate (SA) and carbide slag clarified solution (Ca2+). Through an orthogonal experiment, the effects of raw material addition on the compressive strength and apparent viscosity of the gel were analyzed. According to the analysis results, the optimal experimental ratio was obtained, i.e., 2 wt% of LS, 0.25 wt% of SA, 15 wt% of AA, 0.1 wt% of MBA and 0.3 wt% of APS. Furthermore, the structure of the gel are characterized by FTIR, XRD, SEM, XPS, and TG‐DTG, and the results prove that the gel successfully polymerized and a stable three‐dimensional network structure is formed. The results of water absorption experiment disclose that the gel is sensitive to ions and pH, and the water absorption rate reaches 121.25 times. In addition, the results of the air leakage experiment and fire extinguishing experiment show that the gel can effectively cover the surface of crushed coal and densely fill the gaps, demonstrating a good plugging capability and fire extinguishing capability.

show abstract

A macroporous smart gel based on a pH-sensitive polyacrylic polymer for the development of large size artificial muscles with linear contraction

Abstract: The physics of soft matter can contribute to the revolution in robotics and medical prostheses.These two fields requires the development of artificial muscles with behavior close to the biologicalmuscle. Today,...

Cited by 6 publications

References 73 publications

Development of a Soft Actuator from Fast Swelling Macroporous PNIPAM Gels for Smart Braille Device Applications in Haptic Technology

Development of a Soft Actuator from Fast Swelling Macroporous PNIPAM Gels for Smart Braille Device Applications in Haptic Technology

Plant‐Like Tropisms in Artificial Muscles

Synthesis and properties of environmentally friendly double‐network fire fighting gel: Based on natural polymer/industrial solid waste

Contact Info

Product

Resources

About