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Special Issue "Smart Materials for Soft Sensors and Actuators"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 16 April 2018

Special Issue Editors

Guest Editor
Dr. Youngsu Cha

Center for Robotics Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea
Website | E-Mail
Interests: smart materials; energy harvesting; flexible sensors and actuators; fluid-structure interactions; robotics
Guest Editor
Prof. Dr. Maurizio Porfiri

Department of Mechanical and Aerospace Engineering, Tandon School of Engineering, New York University, Brooklyn, NY 11201, USA
Website | E-Mail
Interests: dynamical systems theory and applications; mechanics of advanced materials; multiphysics modeling; smart materials and structures

Special Issue Information

Dear Colleagues,

Soft active materials are emerging as a promising technology for sensing and actuation.  These materials display physical coupling in two or more domains, such as electrostatics and mechanics in piezoelectrics, while offering the important benefit of flexibility. These propitious features constitute an empowering tool of for new applications in science and engineering, such as wearable devices, artificial skin, artificial muscles, biomimetic robots, and soft robots.

In this Special Issue, we are interested in smart materials for state of the art applications in soft sensors and actuators. We hope that this special issue will be a seed for the new ambitious insight into the science and engineering of smart materials. Exemplary material systems include electroactive polymers, ferroelectrics, ionic polymer metal composites (IPMCs), photovoltaics, piezoelectrics, shape memory alloys (SMAs), and thermoelectrics.

We invite your original research articles about recent technological advancements in smart materials for flexible sensors and actuators. Our scope includes experimental, theoretical, and computational approaches.

Dr. Youngsu Cha
Prof. Dr. Maurizio Porfiri
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1500 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • smart materials
  • soft active materials
  • multifunctional materials
  • electromechanical coupling
  • piezoelectrics
  • flexible sensors
  • flexible actuators
  • wearable devices
  • artificial muscles
  • artificial skin
  • biomimetics
  • soft robotics

Published Papers

This special issue is now open for submission, see below for planned papers.

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Influence of depolarizing fields and screening effects on phase transitions in ferroelectric composites
Authors: Boris Darinskii 1, Alexander Sidorkin 1, Alexander Sigov 2 and Nadezhda Popravko 1
Affiliation: 1 Voronezh State University, University sq.1, Voronezh, Russia
2 Moscow Technological University (MIREA), Vernadsky Avenue 78, Moscow, Russia
Abstract: The temperature of the transition to the polar state in ferroelectric composites, which are spherical ferroelectric inclusions embedded in a dielectric matrix, under depolarizing field effect is investigated. This temperature is determined both in the absence of screening effects of the depolarizing field of the bound charges of spontaneous polarization at the inclusions surface, and in the presence of screening effects. It is shown that in the first case the Curie point shift is determined by the ratio of the Curie constant of the ferroelectric inclusion to the permittivity of the matrix. In the presence of screening effects of the depolarizing field, the transition temperature shift decreases as a result of multiplying this value by a decreasing factor equal to the ratio of the screening length to the radius of the ferroelectric inclusion. Some examples of the materials for which the position of the Curie point on the temperature scale is largely determined by the tilting action of the depolarizing field and the compensating shielding effects are given.
Keywords: Ferroelectric nanocomposites, Smart materials, Phase transitions, Dielectric properties

Title: Understanding the thermal properties of ionomers to optimize fabrication processes for IPMCs
Authors: Sarah Trabia 1, Kisuk Choi 2, Taeseon Hwang 1, Jae-Do Nam 2, and Kwang J. Kim 1
Affiliation: 1 Active Materials and Smart Living (AMSL) Laboratory, Mechanical Engineering Department, University of Nevada—Las Vegas, Las Vegas, NV 89154-4027, USA
2 Department of Polymer Science and Engineering, Division of Applied Chemistry, Sungkyunkwan University, Suwon 440-746, Republic of Korea
Abstract: Ionic Polymer-Metal Composites (IPMCs) have ionomer bases with a noble metal plated on the surface. The ionomer is usually Nafion, but recently Aquivion has been shown to be a good base as well. One of the forms ionomers is available in is precursor pellet. This un-activated form can melt, unlike its activated form. However, there is not much study on the thermal characteristics of these polymers. The lack of knowledge causes issues when trying to fabricate ionomer shapes using methods such as extrusion, hot-pressing, and more recently, injection molding and 3D printing. To understand the two ionomers, a set of tests were conducted to measure the thermal degradation temperature, viscosity, melting temperature, and glass transition. The results have shown that Aquivion has a higher melting temperature (240°C) than Nafion (200°C) and a larger glass transition range (36-55°C compared with 21-30°C). The two have the same thermal degradation (330°C). Aquivion is more viscous than Nafion as temperature increases. Based on the results gathered, it seems that Aquivion is more stable as temperature increases, facilitating the manufacturing processes. This paper presents the data collected to assist researchers in thermal-based fabrication processes.

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