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- Jeong, Seung Hee, 1978-, et al.
(författare)
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High Resolution Patterning of Liquid Alloy by Shrinking the Substrate
- 2016
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Konferensbidrag (refereegranskat)abstract
- In order to overcome the current limitation in the resolution of the previous developed, liquid alloy patterning method, a shrinking substrate is, for the first time, employed. The current printing technique combining spraying a liquid alloy and transferring a tape mask can be processed with a 100 μm level resolution. This is limited by the resolution of a mask fabricated by using a cutting plotter. By shrinking a substrate, a smaller scale of the liquid alloy pattern can be created without changing the current printing process with a tape mask, which has the advantage of quick and easy processing. We have found that the shrinking process by relaxing a radially 200% pre-strained substrate makes to increases twofold in the resolution of the liquid alloy line pattern.
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| 2. |
- Jeong, Seung Hee, 1978-, et al.
(författare)
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High Resolution Patterning of Liquid Alloy with Stretch Shrink Printing for a High Density Array of Small, Stretchable Strain Sensors
- 2016
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Konferensbidrag (refereegranskat)abstract
- A liquid alloy allows large strain due to its liquid state in a stretchable and deformable system and thus,a resistive strain sensor made of liquid alloy can measure large strain of human motion. Liquid alloy-based strainsensors have been demonstrated with various designs for a better understanding of human motion dynamics and toimprove the design of wearable robotics. So far, the sensors have a large size of several centimeters.To expand the applicability of liquid alloy-based strain sensors, a high resolution patterning technique would enable asmall size and high density of the strain sensor. This allows strain measurements in area-limited situations ordirectional strain measurement with high density arrays. A small-size, high-density stretchable strain sensor array canbenefit many DOF (degree of freedom) dynamics measurements on, e.g., a shoulder, hand, foot, or neck.For realizing a highly stretchable strain sensor, a novel soft, highly stretchable and sticky elastomer was used toencapsulate the liquid alloy. A quick and simple patterning technique for high density design has been developed. Thiscombined our previously developed spray printing technique of the liquid alloy with a stretched elastomer substrateand encapsulation of it. The substrate could be stretched either one dimensionally or radially, depending on thedesign.High resolution patterns that were radially stretched and uniformly shrunken on an elastomer substrate weresuccessfully achieved with the stretch-shrink-printing technique. This technique enables large area fabrication withone step processing. High density patterns that have a low resistance and large stretchability were realized with theliquid alloy for a small and highly stretchable strain sensor. A high density array of small strain sensors wasdemonstrated in measuring strains in different directions of neck movements of the human body.
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