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Micromachines
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The Joint International Conference on Applied Physics and Materials Applications...
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The Joint International Conference on Applied Physics and Materials Applications & Applied Magnetism and Ferroelectrics

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (20 August 2022) | Viewed by 7452

Special Issue Editors

Dr. Thanapong Sareein

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Guest Editor
Division of Industrial Materials Science, Faculty of Science and Technology, Rajamangala University of Technology Phra Nakhon, Bangkok 10800, Thailand
Interests: ferroelectricity; advanced sensors; smart materials; storage devices
Dr. Mati Horprathum

E-Mail Website
Guest Editor
Opto-Electrochemical Sensing Research Team, Spectroscopic and Sensing Devices Research Group, National Electronics and Computer Technology Center, Pathum Thani 12120, Thailand
Interests: thin film technology; nanofabrication; opto-chemical sensor; plasmonic devices; photonic devices
Dr. Nuttachai Jutong

E-Mail Website
Guest Editor
Research Center for Quantum Technology, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
Interests: DFT; spintronics; spin orbit torque; multiscale modeling; terahertz spintronic devices
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues, 

This Special Issue publishes selected articles from the Joint International Conference on Applied Physics and Materials Applications and Applied Magnetism and Ferroelectrics (ICAPMA-JMAG-2021) held on 1–4 December 2021 at Nong Nooch Pattaya Garden and Resort, Pattaya, Thailand. ICAPMA-JMAG-2021 is organized as a hybrid conference between regular and virtual events and is jointly hosted by ACerS-Thailand Chapter and IEEE-MagSoc-Thailand Chapter, and professionally organized by i-STEM.

Relevant topics include:

  • Electronic and magnetic materials and magnets;
  • Piezoelectric and dielectric materials;
  • Energy and energy storage materials;
  • Bioplastics, biomaterials, polymer composite, and environmental materials;
  • Ceramics engineering, science and glass materials and technology;
  • Nanomaterials, thick and thin films, and surface sciences.

Dr. Thanapong Sareein
Dr. Mati Horprathum
Dr. Nuttachai Jutong
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 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

  • harvesting energy
  • micro- and nanofabrication
  • micromachining processes
  • system integration
  • photonic engineering
  • chemical and biosensor
  • electrochemical devices
  • advanced low-dimensional nanomaterials

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

12 pages, 2488 KiB  
Article
Preparation and Characterization of PLG Microparticles by the Multiple Emulsion Method for the Sustained Release of Proteins
by Arphaphat Yenying, Krissana Tangamatakul, Chayarop Supanchart, Thannaphat Jenvoraphot, Kiattikhun Manokruang, Patnarin Worajittiphon, Winita Punyodom and Donraporn Daranarong
Micromachines 2022, 13(10), 1761; https://doi.org/10.3390/mi13101761 - 18 Oct 2022
Cited by 1 | Viewed by 1558
Abstract
Rapid release and diminished stability are two of the limitations associated with the growth factors that are essentially used in dental applications. These growth factors are employed to enhance the quality and quantity of tissue or bone matter during regeneration. Therefore, drug delivery [...] Read more.
Rapid release and diminished stability are two of the limitations associated with the growth factors that are essentially used in dental applications. These growth factors are employed to enhance the quality and quantity of tissue or bone matter during regeneration. Therefore, drug delivery devices and systems have been developed to address these limitations. In this study, bovine serum albumin (BSA), as a representative growth factor, was successfully sustained by encapsulation with the medium-absorbable copolymer, poly(L-lactide-co-glycolide) (PLG) 70:30% mol, via the multiple emulsion method. Different PLG, PVA, and BSA concentrations were used to investigate their effects on the BSA encapsulation efficiency. The suitable ratios leading to a better characterization of microparticles and a higher encapsulation efficiency in producing encapsulated PLG microparticles were 8% (w/v) of PLG, 0.25% (w/v) of PVA, and 8% (w/v) of BSA. Furthermore, an in vitro release study revealed a bursting release of BSA from the encapsulated PLG microsphere in the early phase of development. Subsequently, a gradual release was observed over a period of eight weeks. Furthermore, to encapsulate LL-37, different proteins were used in conjunction with PLG under identical conditions with regard to the loading efficiency and morphology, thereby indicating high variations and poor reproducibility. In conclusion, the encapsulated PLG microparticles could effectively protect the protein during encapsulation and could facilitate sustainable protein release over a period of 60 days. Importantly, an optimal method must be employed in order to achieve a high degree of encapsulation efficiency for all of the protein or growth factors. Accordingly, the outcomes of this study will be useful in the manufacture of drug delivery devices that require medium-sustained release growth factors, particularly in dental treatments. Full article
(This article belongs to the Special Issue The Joint International Conference on Applied Physics and Materials Applications & Applied Magnetism and Ferroelectrics)
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13 pages, 455 KiB  
Article
Unconventional Rashba Spin-Orbit Coupling on the Charge Conductance and Spin Polarization of a Ferromagnetic/Insulator/Ferromagnetic Rashba Metal Junction
by Aek Jantayod
Micromachines 2022, 13(8), 1340; https://doi.org/10.3390/mi13081340 - 18 Aug 2022
Cited by 1 | Viewed by 1870
Abstract
A ferromagnetic/insulator/ferromagnetic Rashba metal junction (FM/I/FRM) with both Rashba spin–orbit coupling (RSOC) and exchange energy splitting was studied theoretically. Two kinds of interactions in FRM generate the three metallic states in a FRM; the Rashba ring metal (RRM) state, the anomalous Rashba metal [...] Read more.
A ferromagnetic/insulator/ferromagnetic Rashba metal junction (FM/I/FRM) with both Rashba spin–orbit coupling (RSOC) and exchange energy splitting was studied theoretically. Two kinds of interactions in FRM generate the three metallic states in a FRM; the Rashba ring metal (RRM) state, the anomalous Rashba metal (ARM) state and the normal Rashba metal (NRM) state. The scattering method and the free-electron model are used to describe the transport properties of particles and to calculate the conductance spectrum and the spin polarization of current in the junction. The conductance spectrum in the applied voltage shows the prominent features at the boundaries not only for the three states of the FRM but also in the ARM state. In addition, the conductance in the RRM and ARM states is strongly influenced by both the thickness and barrier height of the insulator layer. We also found that the spin polarization obtains a high value in the ARM state and is not affected by the qualities of the insulator, unlike the RRM and NRM states. Obtaining high-spin polarization from FRM material can be useful to produce spintronic devices in future devices. Full article
(This article belongs to the Special Issue The Joint International Conference on Applied Physics and Materials Applications & Applied Magnetism and Ferroelectrics)
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12 pages, 4894 KiB  
Article
Screen-Printing of Functionalized MWCNT-PEDOT:PSS Based Solutions on Bendable Substrate for Ammonia Gas Sensing
by Direk Boonthum, Chutima Oopathump, Supasil Fuengfung, Patipak Phunudom, Ananya Thaibunnak, Nachapan Juntong, Suvanna Rungruang and Udomdej Pakdee
Micromachines 2022, 13(3), 462; https://doi.org/10.3390/mi13030462 - 18 Mar 2022
Cited by 6 | Viewed by 2820
Abstract
Multi-walled carbon nanotubes (MWCNTs) were grown on a stainless-steel foil by thermal chemical vapor deposition (CVD) process. The MWCNTs were functionalized with carboxylic groups (COOH) on their surfaces by using oxidation and acid (3:1 H2SO4/HNO3) treatments for [...] Read more.
Multi-walled carbon nanotubes (MWCNTs) were grown on a stainless-steel foil by thermal chemical vapor deposition (CVD) process. The MWCNTs were functionalized with carboxylic groups (COOH) on their surfaces by using oxidation and acid (3:1 H2SO4/HNO3) treatments for improving the solubility property of them in the solvent. The functionalized MWCNTs (f-MWCNTs) were conducted to prepare the solution by continuous stir in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), dimethyl sulfoxide (DMSO), ethylene glycol (EG) and Triton X-100. The solution was deposited onto a bendable substrate such as polyethylene terephthalate (PET) with a fabricated silver interdigitated electrode for application in a room-temperature gas sensor. A homemade-doctor blade coater, an UNO R3 Arduino board and a L298N motor driver are presented as a suitable system for screen printing the solution onto the gas-sensing substrates. The different contents of f-MWCNTs embedded in PEDOT:PSS were compared in the gas response to ammonia (NH3), ethanol (C2H5OH), benzene (C6H6), and acetone (C3H6O) vapors. The results demonstrate that the 3.0% v/v of f-MWCNT solution dissolved in 87.8% v/v of PEDOT:PSS, 5.4% v/v of DMSO, 3.6% v/v of EG and 0.2% v/v of Triton X-100 shows the highest response to 80 ppm NH3. Finally, the reduction in the NH3 response under heavy substrate-bending is also discussed. Full article
(This article belongs to the Special Issue The Joint International Conference on Applied Physics and Materials Applications & Applied Magnetism and Ferroelectrics)
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