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Micromachines
Special Issues
Wearable Piezoelectric Devices
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Wearable Piezoelectric Devices

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: closed (20 July 2021) | Viewed by 5080

Special Issue Editor

Dr. Vincenzo Mariano Mastronardi

E-Mail Website
Guest Editor
1. Istituto Italiano di Tecnologia, Center for Biomolecular Nanotechnologies, 73010 Lecce, Italy
2. Department of Innovation Engineering, Università del Salento, 73010 Lecce, Italy
Interests: micro-electro-mechanical systems (MEMS) design and fabrication; flexible piezoelectric transducers for sensing and energy harvesting; piezoelectric micro-machined ultrasonic transducers (PMUT); wearable piezoelectric sensors for vital sign monitoring
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recent advances in materials science and mechanical engineering have enabled the development of high-performance piezoelectric systems and devices in extremely thin, soft, lightweight, compliant, flexible, and mechanically stretchable formats, suitable to be used in a wide range of bio-integrated applications, from mechanical energy harvesting up to sensing and actuation.

Such technologies rely on the capability of piezoelectric materials to convert mechanical energy in usable electrical forms and, vice versa, to convert electric driving potential in mechanical movements, such as vibrations and acoustic waves. Electrical power can be generated from vibrations associated with movements of the human body or inner organs. Similarly, the application of electric fields in piezoelectrics yields well-controlled mechanical forces for actuation in robotics, biomedical devices, and metrology tools, such as sensors for blood pressure measurements and vital sign monitoring based on ultrasound generation. These dual functions of piezoelectrics, together with features such as biocompatibility, flexibility, stretchability, low irritation, and skin-friendly, provide the foundations for numerous applications of increasing interest, especially in wearable and implantable low-power consumption smart systems. In this way, they can offer the opportunity to support the continuous monitoring of human health status and support physicians in diagnosing critical diseases in a minimally obtrusive way.

This Special Issue focuses on new approaches in the area of wearable piezoelectric devices and technology applications. Submissions should span all aspects of the development and application of these smart systems.

Dr. Vincenzo Mariano Mastronardi
Guest Editor

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 submissions that pass pre-check are 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. Micromachines 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 2600 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

  • piezoelectric materials
  • flexible and stretchable devices
  • smart devices
  • sensing and actuation
  • energy harvesting
  • wearable systems
  • implantable devices
  • mini-invasive monitoring
  • healthcare and biomedical technologies
  • bio-integrated applications

Published Papers (2 papers)

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Research

15 pages, 6249 KiB  
Article
A Prototype Sensor System Using Fabricated Piezoelectric Braided Cord for Work-Environment Measurement during Work from Home
by Yoshiro Tajitsu, Jun Takarada, Kohei Takatani, Riku Nakanishi, Hiroki Yanagimoto, Seita Shiomi, Isamu Nakagawa, Ikuo Kawahara, Takuo Nakiri, Saki Shimda, Yoji Shimura, Takuto Nonomura, Kazunori Kojima, Atsuhisa Ikeguch, Kazuhiro Okayama, Tomohiro Sakai, Yuichi Morioka, Mitsuru Takahashi, Kazuki Sugiyama, Rei Nisho and Koji Takeshitaadd Show full author list remove Hide full author list
Micromachines 2021, 12(8), 966; https://doi.org/10.3390/mi12080966 - 15 Aug 2021
Cited by 6 | Viewed by 2485
Abstract
We proposed a new prototype sensor system to understand the workload of employees during telework. The goal of sensing using such a system is to index the degree of stress experienced by employees during work and recognize how to improve their work environment. [...] Read more.
We proposed a new prototype sensor system to understand the workload of employees during telework. The goal of sensing using such a system is to index the degree of stress experienced by employees during work and recognize how to improve their work environment. Currently, to realize this, image processing technology with a Web camera is generally used for vital sign sensing. However, it creates a sense of discomfort at work because of a strong sense of surveillance. To truly evaluate a working environment, it is necessary that an employee be unaware of the sensor system and for the system to be as unobtrusive as possible. To overcome these practical barriers, we have developed a new removable piezoelectric sensor incorporated in a piezoelectric poly-L-lactic acid (PLLA) braided cord. This cord is soft and flexible, and it does not cause any discomfort when attached to the cushion cover sheet. Thus, it was possible to measure the workload of an employee working from home without the employee being aware of the presence of a sensor. Additionally, we developed a system for storing data in a cloud system. We succeeded in acquiring continuous long-term data on the vital signs of employees during telework using this system. The analysis of the data revealed a strong correlation between behavior and stress. Full article
(This article belongs to the Special Issue Wearable Piezoelectric Devices)
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14 pages, 3506 KiB  
Article
Improving Output Performance of a Resonant Piezoelectric Pump by Adding Proof Masses to a U-Shaped Piezoelectric Resonator
by Jian Chen, Wenzhi Gao, Changhai Liu, Liangguo He and Yishan Zeng
Micromachines 2021, 12(5), 500; https://doi.org/10.3390/mi12050500 - 29 Apr 2021
Cited by 4 | Viewed by 1887
Abstract
This study proposes the improvement of the output performance of a resonant piezoelectric pump by adding proof masses to the free ends of the prongs of a U-shaped piezoelectric resonator. Simulation analyses show that the out-of-phase resonant frequency of the developed resonator can [...] Read more.
This study proposes the improvement of the output performance of a resonant piezoelectric pump by adding proof masses to the free ends of the prongs of a U-shaped piezoelectric resonator. Simulation analyses show that the out-of-phase resonant frequency of the developed resonator can be tuned more efficiently within a more compact structure to the optimal operating frequency of the check valves by adjusting the thickness of the proof masses, which ensures that both the resonator and the check valves can operate at the best condition in a piezoelectric pump. A separable prototype piezoelectric pump composed of the proposed resonator and two diaphragm pumps was designed and fabricated with outline dimensions of 30 mm × 37 mm × 54 mm. Experimental results demonstrate remarkable improvements in the output performance and working efficiency of the piezoelectric pump. With the working fluid of liquid water and under a sinusoidal driving voltage of 298.5 Vpp, the miniature pump can achieve the maximum flow rate of 2258.9 mL/min with the highest volume efficiency of 77.1% and power consumption of 2.12 W under zero backpressure at 311/312 Hz, and the highest backpressure of 157.3 kPa under zero flow rate at 383 Hz. Full article
(This article belongs to the Special Issue Wearable Piezoelectric Devices)
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