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3 results on '"Manmatha Mahato"'

1. Functionally antagonistic polyelectrolyte for electro-ionic soft actuator

Author

Van Hiep Nguyen, Saewoong Oh, Manmatha Mahato, Rassoul Tabassian, Hyunjoon Yoo, Seong-Gyu Lee, Mousumi Garai, Kwang Jin Kim, and Il-Kwon Oh

Subjects
Science
Abstract

Abstract Electro-active ionic soft actuators have been intensively investigated as an artificial muscle for soft robotics due to their large bending deformations at low voltages, small electric power consumption, superior energy density, high safety and biomimetic self-sensing actuation. However, their slow responses, poor durability and low bandwidth, mainly resulting from improper distribution of ionic conducting phase in polyelectrolyte membranes, hinder practical applications to real fields. We report a procedure to synthesize efficient polyelectrolyte membranes that have continuous conducting network suitable for electro-ionic artificial muscles. This functionally antagonistic solvent procedure makes amphiphilic Nafion molecules to assemble into micelles with ionic surfaces enclosing non-conducting cores. Especially, the ionic surfaces of these micelles combine together during casting process and form a continuous ionic conducting phase needed for high ionic conductivity, which boosts the performance of electro-ionic soft actuators by 10-time faster response and 36-time higher bending displacement. Furthermore, the developed muscle shows exceptional durability over 40 days under continuous actuation and broad bandwidth below 10 Hz, and is successfully applied to demonstrate an inchworm-mimetic soft robot and a kinetic tensegrity system.

Published
2024
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2. CTF-based soft touch actuator for playing electronic piano

Author

Manmatha Mahato, Rassoul Tabassian, Van Hiep Nguyen, Saewoong Oh, Sanghee Nam, Won-Jun Hwang, and Il-Kwon Oh

Subjects
Science
Abstract

Actuators often show a lack of high bending displacement with back relaxation and irregular response characteristics under low input voltages. Here, the authors demonstrate a covalent triazine framework-based electroionic soft actuator that shows controllable high bending deformation under low input voltages.

Published
2020
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3. CTF-based soft touch actuator for playing electronic piano

Author

Saewoong Oh, Wonjun Hwang, Manmatha Mahato, Il-Kwon Oh, Sanghee Nam, Rassoul Tabassian, and Van Hiep Nguyen

Subjects
Materials science, Acoustics, Science, Soft robotics, General Physics and Astronomy, 02 engineering and technology, Bending, 010402 general chemistry, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Displacement (vector), Article, lcsh:Science, Group delay and phase delay, Multidisciplinary, Soft materials, General Chemistry, 021001 nanoscience & nanotechnology, Mechanical engineering, 0104 chemical sciences, Electrode, Artificial muscle, lcsh:Q, 0210 nano-technology, Actuator, Voltage
Abstract

In the field of bioinspired soft robotics, to accomplish sophisticated tasks in human fingers, electroactive artificial muscles are under development. However, most existing actuators show a lack of high bending displacement and irregular response characteristics under low input voltages. Here, based on metal free covalent triazine frameworks (CTFs), we report an electro-ionic soft actuator that shows high bending deformation under ultralow input voltages that can be implemented as a soft robotic touch finger on fragile displays. The as-synthesized CTFs, derived from a polymer of intrinsic microporosity (PIM-1), were combined with poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT-PSS) to make a flexible electrode for a high-performance electro-ionic soft actuator. The proposed soft touch finger showed high peak-to-peak displacement of 17.0 mm under ultralow square voltage of ±0.5 V, with 0.1 Hz frequency and 4 times reduced phase delay in harmonic response compared with that of a pure PEDOT-PSS-based actuator. The significant actuation performance is mainly due to the unique physical and chemical configurations of CTFs electrode with highly porous and electrically conjugated networks. On a fragile display, the developed soft robotic touch finger array was successfully used to perform soft touching, similar to that of a real human finger; device was used to accomplish a precise task, playing electronic piano., Actuators often show a lack of high bending displacement with back relaxation and irregular response characteristics under low input voltages. Here, the authors demonstrate a covalent triazine framework-based electroionic soft actuator that shows controllable high bending deformation under low input voltages.

Published
2020

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