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Towards a Unified Naming Scheme for Thermo-Active Soft Actuators: A Review of Materials, Working Principles, and Applications

Trevor Exley, Emilly Hays, Daniel Johnson, Arian Moridani, Ramya Motati, Amir Jafari

TL;DR

The paper addresses fragmentation in soft robotics nomenclature by showing how inconsistent terms hinder literature search and cross-disciplinary understanding. It proposes a universal naming scheme that encodes three factors—Working Principle, Material, and Application—and develops criteria to assess clarity and impact. An evidence-based appraisal uses an IEEE Xplore-based literature crawl, readability metrics, and citations to map naming usage and illustrate a quadrant distribution, guiding naming practices. The work offers concrete guidelines for applying the naming scheme and discusses applications from artificial muscles to haptic displays, while outlining future directions to improve bandwidth, thermal management, and multi-domain integration in thermo-active soft actuators.

Abstract

Soft robotics is a rapidly growing field that spans the fields of chemistry, materials science, and engineering. Due to the diverse background of the field, there have been contrasting naming schemes such as 'intelligent', 'smart' and 'adaptive' materials which add vagueness to the broad innovation among literature. Therefore, a clear, functional and descriptive naming scheme is proposed in which a previously vague name -- Soft Material for Soft Actuators -- can remain clear and concise -- Phase-Change Elastomers for Artificial Muscles. By synthesizing the working principle, material, and application into a naming scheme, the searchability of soft robotics can be enhanced and applied to other fields. The field of thermo-active soft actuators spans multiple domains and requires added clarity. Thermo-active actuators have potential for a variety of applications spanning virtual reality haptics to assistive devices. This review offers a comprehensive guide to selecting the type of thermo-active actuator when one has an application in mind. Additionally, it discusses future directions and improvements that are necessary for implementation.

Towards a Unified Naming Scheme for Thermo-Active Soft Actuators: A Review of Materials, Working Principles, and Applications

TL;DR

The paper addresses fragmentation in soft robotics nomenclature by showing how inconsistent terms hinder literature search and cross-disciplinary understanding. It proposes a universal naming scheme that encodes three factors—Working Principle, Material, and Application—and develops criteria to assess clarity and impact. An evidence-based appraisal uses an IEEE Xplore-based literature crawl, readability metrics, and citations to map naming usage and illustrate a quadrant distribution, guiding naming practices. The work offers concrete guidelines for applying the naming scheme and discusses applications from artificial muscles to haptic displays, while outlining future directions to improve bandwidth, thermal management, and multi-domain integration in thermo-active soft actuators.

Abstract

Soft robotics is a rapidly growing field that spans the fields of chemistry, materials science, and engineering. Due to the diverse background of the field, there have been contrasting naming schemes such as 'intelligent', 'smart' and 'adaptive' materials which add vagueness to the broad innovation among literature. Therefore, a clear, functional and descriptive naming scheme is proposed in which a previously vague name -- Soft Material for Soft Actuators -- can remain clear and concise -- Phase-Change Elastomers for Artificial Muscles. By synthesizing the working principle, material, and application into a naming scheme, the searchability of soft robotics can be enhanced and applied to other fields. The field of thermo-active soft actuators spans multiple domains and requires added clarity. Thermo-active actuators have potential for a variety of applications spanning virtual reality haptics to assistive devices. This review offers a comprehensive guide to selecting the type of thermo-active actuator when one has an application in mind. Additionally, it discusses future directions and improvements that are necessary for implementation.
Paper Structure (16 sections, 2 equations, 10 figures, 2 tables)

This paper contains 16 sections, 2 equations, 10 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Review Structure
  3. Naming Scheme
  4. Literature Search
  5. Materials and Working Principles
  6. Materials
  7. Shape Memory
  8. Block Copolymers
  9. Liquid Crystal Elastomer
  10. Thermally-Responsive Hydrogels
  11. Working Principles
  12. Phase-Change
  13. Electrothermal
  14. Applications of Thermo-Active Actuators
  15. Current Challenges and Future Directions
  16. ...and 1 more sections

Figures (10)

  • Figure 1: (a) Quadrant chart comparing published papers based on naming scheme in terms of clarity and impactfulness, black dots represent the 130 papers scraped, with select ten titles with larger colored dots labeled. (b) Sample implementation of proposed naming scheme.
  • Figure 2: Keyword Frequency in 130 Papers on Thermo-Active Robotics
  • Figure 3: Strain graph showing the recoverable deformation of shape memory polymers. Reproduced from Delaey et al.https://doi.org/10.1002/adfm.201909047 with permissions.
  • Figure 4: Block copolymer fiber characterized by hydrophobic and hydrophilic regions for reversible strain-programmed crystallization (SPC) and actuation. Reproduced from Lang et al.Lang2022-jy with permission.
  • Figure 5: Programmable actuation of liquid crystal elastomers between contraction and shear actuation types based on deformation and heating. Reproduced from Wang et al.https://doi.org/10.1002/aisy.201900177 with permission.
  • ...and 5 more figures