Giant Bending Motion of a Soft Actuator Controlled by Hydrogen Gas Pressure

Nishi, Yoshitake; Uchida, Haru-Hisa; Yabe, Hiromasa; Kim, Byungsuk; Ogasawara, Takashi

doi:10.1177/1045389x06055765

Cited by 6 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hydrogen storage alloy, such as LaNi 5 , exhibits as large as 25% of volume expansion by hydrogenation under atmospheric pressure. 1) In our previous works, two types of mover composites, which are LaNi 5 film deposited on substrates [2][3][4][5] and LaNi 5 powders dispersed soft composites rod coated on silicone rubber, [6][7][8][9] have been proposed. They exhibit the bending motion operated by hydrogen gas pressure change, as if a bi-metal operated by temperature change.…”

Section: Introductionmentioning

confidence: 99%

Giant Bending Strain of Reversible Motion of Uni-Morph Soft Mover Composites Driven by Hydrogen Storage Alloy Powders Dispersed in Polyurethane Sheet

et al. 2009

Self Cite

View full text Add to dashboard Cite

In order to generate the bending motion operated by pressure change in hydrogen gas, soft uni-morph composites were prepared, in which composites dispersed with not only driving particles of LaNi 5 hydrogen storage alloy with Pd-Al 2 O 3 catalyst powders to get high responsiveness, were piled up on a simple polyurethane sheet. Since the highest values of irreversible bending strain at the first hydrogenation (" 1) under 0.3 MPa H 2 gas and the maximum irreversible bending strain during hydrogenation cycles (" m) were remarkably obtained at the 35 vol% of LaNi 5 powders dispersed in polyurethane composites, the bending strain of reversible motion was detected from the first to the 8th hydrogenation (" r 1 and " r 8) under 0.2 MPa H 2 gas. The bending strain of reversible motion of polyurethane composites sheet is more than 2000 ppm, which was approximately equal to that of silicone rubber composites and is extremely larger than that (300 ppm) of ABS resin composites. Responsiveness (d"=dt) of cyclic motion of elastic deformed mover composites, which were constructed with 35 vol%LaNi 5 dispersed powder and matrix of polyurethane or silicone rubber, were more than 10 times higher than that of ABS composite.

show abstract

Section: Introductionmentioning

confidence: 99%

Giant Bending Strain of Reversible Motion of Uni-Morph Soft Mover Composites Driven by Hydrogen Storage Alloy Powders Dispersed in Polyurethane Sheet

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, since H 2 has suf cient permeability in polymers, 2-layer actuators (SR:LaNi 5 /SR) consisting of two 500 μm thick silicon rubber (SR) elements have been suggested: a driving SR sheet dispersed with LaNi 5 powder adhered to supporting pure SR thick sheet or rod. [6][7][8] However desired high responsiveness of soft polymer dispersed with LaNi 5 alone is not achieved. [6][7][8] An addition of Pd-Al 2 O 3 catalyst to the LaNi 5 powder prior to dispersion in polymer has enhanced the responsiveness as well as motion strain.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8] However desired high responsiveness of soft polymer dispersed with LaNi 5 alone is not achieved. [6][7][8] An addition of Pd-Al 2 O 3 catalyst to the LaNi 5 powder prior to dispersion in polymer has enhanced the responsiveness as well as motion strain. 9) Stiffness has been improved in 2-layer actuators (PU:LaNi 5 /PU) 10) where both layers are 500 μm thick polyurethane (PU): the driving PU layer dispersed with (35 vol%) LaNi 5 -Pd-Al 2 O 3 mixture prepared by solution cast method.…”

Section: Introductionmentioning

confidence: 99%

An Improved H2-Gas Pressure Operated LaNi5 Powder-Dispersed Polyurethane/Titanium 2-Layer Actuator with Reversible Giant and Rapid Expansion by Hydrogenation

et al. 2018

Self Cite

View full text Add to dashboard Cite

A unimorph 2-layer (PU:LaNi 5 /Ti) actuator consisting of a driving composite sheet with large expansion of polyurethane (PU) dispersed with powder mixture of hydrogen storage alloy of 35 vol%-LaNi 5 and Pd-Al 2 O 3 catalyst prepared by solution cast method, and a 5 μm thick Ti sheet exhibited reversible and giant rapid bending motion when subjected to hydrogen atmosphere. Reversible motion was achieved below 0.20 MPa-H 2 pressure where maximum strain (ε max) values on vertical and horizontal directions were more than 2400 and 1800 ppm, respectively about 1.6 times larger than that reported (1520 and 1120 ppm) for the same actuator PU:LaNi 5 /Cu with 10 μm thick copper (Cu) sheet. Moreover, the maximum responsiveness (dε/dt) max by hydrogenation of cyclic motion of the PU:LaNi 5 /Ti was higher than that of the PU:LaNi 5 /Cu. The increased (dε/dt) max values mostly corresponded to decreasing elastic load resistivity (dF/dε). These were due to Ti having higher stiffness and strength than Cu allowing thinner 5 μm sheet. Caution for safety is advised since values presented herein may be different when applying the actuator to zero gravity environments.

show abstract

“…This mover device shows the bending motion induced by hydrogen gas pressure change. [2][3][4][5] Additionally, the bending motion device of thin film hydrogen storage alloy with palladium coating for enhancing the responsiveness is also made up and tested. As a result, the palladium deposition reduces the initiating time from 100 to 1 s for the actuation to be measured after hydrogen gas exposure.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Bending Motion by Catalyst Addition of Pd-Al2O3 Powder for an Uni-Morph Soft Device Constructed of Polymer Sheets with and without Powder Dispersion of Hydrogen Storage Alloy

2007

Self Cite

View full text Add to dashboard Cite

In order to generate the soft bending motion driven by pressure change in hydrogen gas, a soft device was made up and tested. In former research, a unimorph structure was proposed, in which a silicone rubber with LaNi 5 alloy powder distributed was piled up on a pure silicone rubber sheet. Using this structure we succeeded a bending motion of the soft device by applying hydrogen gas pressure. However the mechanical response was slow. To improve the active motion, a catalyst of Pd-Al 2 O 3 powder was mixed into the hydrogen storage alloy powder in the rubber. By simple addition of catalyst powder before dispersion into the rubber, we obtained drastically modified responses and displacement in the movement of the device. The catalyst probably accelerated dissociation of hydrogen molecule on the surface of hydrogen storage material particle.

show abstract

Giant Bending Motion of a Soft Actuator Controlled by Hydrogen Gas Pressure

Cited by 6 publications

References 2 publications

Giant Bending Strain of Reversible Motion of Uni-Morph Soft Mover Composites Driven by Hydrogen Storage Alloy Powders Dispersed in Polyurethane Sheet

Giant Bending Strain of Reversible Motion of Uni-Morph Soft Mover Composites Driven by Hydrogen Storage Alloy Powders Dispersed in Polyurethane Sheet

An Improved H<sub>2</sub>-Gas Pressure Operated LaNi<sub>5</sub> Powder-Dispersed Polyurethane/Titanium 2-Layer Actuator with Reversible Giant and Rapid Expansion by Hydrogenation

Improvement of Bending Motion by Catalyst Addition of Pd-Al<SUB>2</SUB>O<SUB>3</SUB> Powder for an Uni-Morph Soft Device Constructed of Polymer Sheets with and without Powder Dispersion of Hydrogen Storage Alloy

Contact Info

Product

Resources

About