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Micromachines
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Feature Papers of Micromachines in 'Engineering and Technology' 2023
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Feature Papers of Micromachines in 'Engineering and Technology' 2023

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

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 6162

Special Issue Editor

Prof. Dr. Stephen Edward Saddow

E-Mail Website
Guest Editor
Department of Electrical Engineering, University of South Florida, 4202 East Fowler Avenue, ENB118, Tampa, FL 33620, USA
Interests: SiC; neural interfaces; SiC MEMS; biotechnology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to announce the Special Issue entitled “Feature Papers of Micromachines in Engineering and Technology 2023”. In recent years, we have cooperated with many excellent scholars/scientific groups and published several very important high-level works that have already received numerous citations according to Web of Science data. We aim to introduce new insights into the scientific developments and cutting-edge technology related to micromachines in the engineering and technology fields, which will make a great contribution to the community.

This Special Issue will be a collection of high-quality papers by outstanding scholars from around the world. Both original research articles and comprehensive review papers are welcome. The papers will be published with full open access after peer review to benefit both authors and readers.

You are welcome to send short proposals for submissions of Feature Papers to our Editorial Office (miska.guo@mdpi.com) before submission. These will undergo a preliminary evaluation by our Editors. Please note that selected full papers will still be subject to a thorough and rigorous peer review.

We look forward to receiving your excellent work.

Prof. Dr. Stephen Edward Saddow
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

  • micro/nano fabrication and manufacturing
  • design and optimization principles of micro- and nanosystems
  • micro-nanosystems and advanced technologies for engineering applications
  • electronic system (including electrical circuits & devices, transistors, capacitors, inductors, resistors, diodes, insulators and conductors) engineering

Published Papers (5 papers)

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Research

12 pages, 5218 KiB  
Article
Quality Factor Improvement of a Thin-Film Piezoelectric-on-Silicon Resonator Using a Radial Alternating Material Phononic Crystal
by Chuang Zhu, Muxiang Su, Temesgen Bailie Workie, Panliang Tang, Changyu Ye and Jing-Fu Bao
Micromachines 2023, 14(12), 2241; https://doi.org/10.3390/mi14122241 - 15 Dec 2023
Viewed by 801
Abstract
This paper studies the radial alternating material phononic crystal (RAM-PnC). By simulating the band gap structure of the phononic crystal, a complete acoustic band gap was verified at the resonant frequency of 175.14 MHz, which can prevent the propagation of elastic waves in [...] Read more.
This paper studies the radial alternating material phononic crystal (RAM-PnC). By simulating the band gap structure of the phononic crystal, a complete acoustic band gap was verified at the resonant frequency of 175.14 MHz, which can prevent the propagation of elastic waves in a specific direction. The proposed alternately arranged radial phononic crystal structure is applied to the thin-film piezoelectric-on-silicon (TPOS) MEMS resonator. The finite element simulation method increases the anchor quality factor (Qanchor) from 60,596 to 659,536,011 at the operating frequency of 175.14 MHz, which is about 10,000 times higher. The motion resistance of the RAM-PnC resonator is reduced from 156.25 Ω to 48.31 Ω compared with the traditional resonator. At the same time, the insertion loss of the RAM-PnC resonator is reduced by 1.1 dB compared with the traditional resonator. Full article
(This article belongs to the Special Issue Feature Papers of Micromachines in 'Engineering and Technology' 2023)
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13 pages, 3223 KiB  
Article
Enhancing the Yield of a Lab-on-a-Disk-Based Single-Image Parasite Quantification Device
by Vyacheslav R. Misko, Ramadhani Juma Makasali, Matthieu Briet, Filip Legein, Bruno Levecke and Wim De Malsche
Micromachines 2023, 14(11), 2087; https://doi.org/10.3390/mi14112087 - 11 Nov 2023
Cited by 1 | Viewed by 793
Abstract
The recently proposed single-image parasite quantification (SIMPAQ) platform based on a Lab-on-a-Disc (LOD) device was previously successfully tested in field conditions, demonstrating its efficiency in soil-transmitted helminth (STH) egg detection and analysis on the level delivered by the current state-of-the-art methods. Furthermore, the [...] Read more.
The recently proposed single-image parasite quantification (SIMPAQ) platform based on a Lab-on-a-Disc (LOD) device was previously successfully tested in field conditions, demonstrating its efficiency in soil-transmitted helminth (STH) egg detection and analysis on the level delivered by the current state-of-the-art methods. Furthermore, the SIMPAQ provides relatively quick diagnostics and requires small amounts of sample and materials. On the other hand, in a recent related study, it was revealed that the performance of the SIMPAQ method can be limited due to the action of the tangential Euler and Coriolis forces, and the interaction of the moving eggs with the walls of the LOD chamber. Here, we propose a new improved design that allows us to overcome these limitations and enhance the yield of the SIMPAQ LOD device, as demonstrated in experiments with a synthetic particle model system and real parasite eggs. Despite the simplicity, the proposed design modification is demonstrated to allow a substantial improvement in the yield of the SIMPAQ device, i.e., above 90% of parasite eggs and 98% of synthetic model particles were transported to the field of view. The new design proposed here will be further examined in the new generation of SIMPAQ devices within ongoing research on STH egg detection in field conditions. Full article
(This article belongs to the Special Issue Feature Papers of Micromachines in 'Engineering and Technology' 2023)
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17 pages, 3744 KiB  
Article
Long-Focusing Device for Broadband THz Applications Based on a Tunable Reflective Biprism
by Giancarlo Margheri and Tommaso Del Rosso
Micromachines 2023, 14(10), 1939; https://doi.org/10.3390/mi14101939 - 18 Oct 2023
Viewed by 760
Abstract
THz radiation has assumed great importance thanks to the efforts in the development of technological tools used in this versatile band of the electromagnetic spectrum. Here, we propose a reflective biprism device with wavelength-independent long-focusing performances in the THz band by exploiting the [...] Read more.
THz radiation has assumed great importance thanks to the efforts in the development of technological tools used in this versatile band of the electromagnetic spectrum. Here, we propose a reflective biprism device with wavelength-independent long-focusing performances in the THz band by exploiting the high thermo-mechanical deformation of the elastomer polydimethylsiloxane (PDMS). This deformation allows for achieving significant optical path modulations in the THz band and effective focusing. The surface of a PDMS layer is covered with a gold thin film acting as a heater thanks to its absorption of wavelengths below ~500 nm. An invariance property of the Fresnel integral has been exploited to experimentally verify the THz performances of the device with an ordinary visible laser source, finding excellent agreement with the theoretical predictions at 1 and 3 THz. The same property also allowed us to experimentally verify that the reflective biprism focus has a longitudinal extension much greater than that exhibited by a benchmark convex cylindrical mirror with the same optical power. The device is thermo-mechanically stable up to a heating power of 270 mW, although it might be potentially exploited at higher powers with minor degradation of the optical performances. Full article
(This article belongs to the Special Issue Feature Papers of Micromachines in 'Engineering and Technology' 2023)
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11 pages, 7409 KiB  
Article
Creating Stretchable Electronics from Dual Layer Flex-PCB for Soft Robotic Cardiac Mapping Catheters
by Abdellatif Ait Lahcen, Alexandre Caprio, Weihow Hsue, Cory Tschabrunn, Christopher Liu, Bobak Mosadegh and Simon Dunham
Micromachines 2023, 14(4), 884; https://doi.org/10.3390/mi14040884 - 20 Apr 2023
Cited by 3 | Viewed by 1886
Abstract
The authors present in this study the development of a novel method for creating stretchable electronics from dual-layer flex printed circuit boards (flex-PCBs) as a platform for soft robotic sensor arrays (SRSAs) for cardiac voltage mapping applications. There is a crucial need for [...] Read more.
The authors present in this study the development of a novel method for creating stretchable electronics from dual-layer flex printed circuit boards (flex-PCBs) as a platform for soft robotic sensor arrays (SRSAs) for cardiac voltage mapping applications. There is a crucial need for devices that utilize multiple sensors and provide high performance signal acquisition for cardiac mapping. Previously, our group demonstrated how single-layer flex-PCB can be postprocessed to create a stretchable electronic sensing array. In this work, a detailed fabrication process for creating a dual-layer multielectrode flex-PCB SRSA is presented, along with relevant parameters to achieve optimal postprocessing with a laser cutter. The dual-layer flex-PCB SRSA’s ability to acquire electrical signals is demonstrated both in vitro as well as in vivo on a Leporine cardiac surface. These SRSAs could be extended into full-chamber cardiac mapping catheter applications. Our results show a significant contribution towards the scalable use of dual-layer flex-PCB for stretchable electronics. Full article
(This article belongs to the Special Issue Feature Papers of Micromachines in 'Engineering and Technology' 2023)
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Graphical abstract

9 pages, 4800 KiB  
Article
On-Line Fluorescence Microscopy for Identification and Imaging of Apoptotic Cell with Synchrotron-Based Soft X-ray Tomography
by Chao Zhang, Zhao Wu, Zheng Dang, Lijiao Tian, Yong Guan, Gang Liu and Yangchao Tian
Micromachines 2023, 14(2), 326; https://doi.org/10.3390/mi14020326 - 27 Jan 2023
Cited by 2 | Viewed by 1477
Abstract
Synchrotron-based soft X-ray tomography (SXT), providing three-dimensional morphology and quantitative distribution of linear absorption coefficient (LAC) of the imaged objects, is widely used in many fields to obtain ultra-structure images, especially in cellular imaging. Off-line fluorescence microscopies (FMs) are combined to identify the [...] Read more.
Synchrotron-based soft X-ray tomography (SXT), providing three-dimensional morphology and quantitative distribution of linear absorption coefficient (LAC) of the imaged objects, is widely used in many fields to obtain ultra-structure images, especially in cellular imaging. Off-line fluorescence microscopies (FMs) are combined to identify the type of organelles and status of cells. However, deformation and displacement usually occur during the transfer and loading process, which decreases the precision of two-modal images’ registration. In this paper, we report on an on-line FM, at the SXT station (BL07W) of the National Synchrotron Radiation Laboratory (NSRL), which avoids deformation and displacement. Therefore, researchers can easily find the sample and take the useful data without tedious post-processing. Combining SXT with on-line FM, we achieved the identification and high-resolution imaging of an apoptotic cell. The experiments revealed that the LAC of the nucleus of the apoptotic cell was larger than that of a normal cell, which could be explained by nucleus pyknosis of the apoptotic cell. Full article
(This article belongs to the Special Issue Feature Papers of Micromachines in 'Engineering and Technology' 2023)
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