Microfabrication with smooth thin carbon nanotube composite sheets

Boyer, Nathan; Pei, Lei; Rowley, J.; Syme, Derric B.; Liddiard, S.; Abbott, Jonathan; Larson, Kyle P.; Liang, Zhiyong; Iverson, Brian D.; Vanfleet, Richard; Davis, Robert C.

doi:10.1088/2053-1591/aa55a4

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…As a result, the curled ETA had a faster initial heating and a higher maximum temperature. Furthermore, it is possible that the randomly aligned CNT buckypaper also contributed to the large bending angle, due to the lower stiffness in comparison to the super aligned buckypaper 51 . Furthermore, Li et al .…”

Section: Resultsmentioning

confidence: 99%

Shape programming of polymeric based electrothermal actuator (ETA) via artificially induced stress relaxation

Sun

Leaker

Lee

et al. 2019

Sci Rep

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Electrothermal actuators (ETAs) are a new generation of active materials that can produce different motions from thermal expansion induced by Joule heating. It is well-known that the degree of deformation is determined by the amount of Joule heating and the coefficient of thermal expansion (CTE) of the material. Previous works on polymeric ETAs are strongly focused on increasing electrical conductivity by utilizing super-aligned carbon nanotube (CNT) sheets. This allows greater deformation for the same drive voltage. Despite these accomplishments with low-voltage actuation, many of the ETAs were constructed to have basic geometries such as a simple cantilever shape. In this paper, it was discovered that shape of polymeric ETA can be programmed into a desired configuration by applying an induced stress relaxation mechanism and post secondary curing. By utilizing such effects, an ETA can be programmed into a curled resting state which allows the actuator to achieve an active bending angle over 540°, a value far greater than any previous studies. This shape programming feature also allows for tailoring the actuator configuration to a specific application. This is demonstrated here by fabricating a small crawling soft robot similar to mimic an inchworm motion.

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Section: Resultsmentioning

confidence: 99%

Shape programming of polymeric based electrothermal actuator (ETA) via artificially induced stress relaxation

Sun

Leaker

Lee

et al. 2019

Sci Rep

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“…Other alignment techniques are mechanical stretching [16], [17] or directly drawn the CNT from a vertically aligned forest to a Buckypaper form [18], [19], which can definitely damage the nanotube structure. More recently, the mechanical knock down of VA-CNT forests to obtain a reoriented CNT patch showed to be a simple and efficient process [20], [21], with application in strain monitoring [22]. Despite all these progresses regarding CNT incorporation into thin films for structural composite monitoring, most of the reports published in literature do not test the CNT based sensors in conventional laminates with real applicability.…”

mentioning

confidence: 99%

Aligned Carbon Nanotube-Based Sensors for Strain Monitoring of Composites

et al. 2021

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This paper presents a proof of concept of an aligned carbon nanotube (CNT) based strain sensor tested on the surface of a conventional aeronautic laminate. Two type of strain sensors were produced, type S and type T, in which the CNT alignment was parallel (Y) and transversal (X) to strain direction, respectively. Their electrical resistance response was thoroughly evaluated during cyclic tensile tests. Despite some disparities of the relative electrical resistance behavior in specific strain cycles, probably due to one-off interferences in the CNT conductive mechanism, the obtained gauge factor (GF) values were quite stable. Also, the electrical resistance anisotropy was evaluated and its opposite behavior when the samples were strained in Y-and X-directions may be used as strain direction indicator. Being able to quantify and indicate strain direction with just one 10 × 10 mm CNT patch, this sensor has proven to be suitable for strain sensing applications, namely for structure health monitoring of advanced composites.

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Free vibration of super-graphene carbon nanotube networks via a beam element based coarse-grained method

Wang

2017

Mater. Res. Express

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Microfabrication with smooth thin carbon nanotube composite sheets

Cited by 4 publications

References 27 publications

Shape programming of polymeric based electrothermal actuator (ETA) via artificially induced stress relaxation

Shape programming of polymeric based electrothermal actuator (ETA) via artificially induced stress relaxation

Aligned Carbon Nanotube-Based Sensors for Strain Monitoring of Composites

Free vibration of super-graphene carbon nanotube networks via a beam element based coarse-grained method

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