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Micromachines
Special Issues
Microreactors and Their Applications
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Special Issue "Microreactors and Their Applications"

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "C：Chemistry".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 2229

Special Issue Editors

Dr. Liangliang Lin

E-Mail Website
Guest Editor
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214126, China
Interests: plasma technology; microreactor; process intensification; microplasma; plasma-nanofabrication
Prof. Dr. Wei He

E-Mail
Guest Editor
College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 210037, China
Interests: polyurethane; biopolyol; green manufacturing; vegetable oil
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As an efficient process intensification strategy, microreactor technology offers many advantages compared to conventional batch reactors, such as enhanced mass and heat transfer rate, continuous operation, intrinsically safe, reduced reagents and solvent consumption, better process control, etc. These characteristics help to open up new opportunities for reactions and processes. Over the past decade, numerous efforts have been devoted to the design and exploration of this innovative technique. Remarkable progress has also been achieved in their applications, such as mixing, separation, chemicals synthesis, nanofabrication, emulsification, detection, clinical diagnostic devices, etc. Accordingly, this Special Issue seeks to showcase research papers, communications, review articles, and mini-reviews that focus on (1) novel designs, fabrication, integration, and scale-up strategies of microreactors, microdevices, or micromachines; (2) the application of microreactors as well as relevant reaction kinetics and mechanisms, including but not limited to chemicals synthesis, nanofabrication, particle formation, emulsification, detection, separation, etc.; and (3) experimental or numerical study of transport phenomena in microreactors.

Dr. Liangliang Lin
Prof. Dr. Wei He
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 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

  • microreactor
  • microfluidics
  • micromachines
  • process intensification

Published Papers (3 papers)

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Research

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13 pages, 2333 KiB  
Article
The Effect of Random Roughness on the Electromagnetic Flow in a Micropipe
by
Zhili Wang
,
Yanjun Sun
and
Yongjun Jian
Micromachines 2023, 14(11), 2054; https://doi.org/10.3390/mi14112054 - 02 Nov 2023
Viewed by 397
Abstract
The features of stationary random processes and the small parameter expansion approach are used in this work to examine the impact of random roughness on the electromagnetic flow in cylindrical micropipes. Utilizing the perturbation method, the analytical solution until second order velocity is [...] Read more.
The features of stationary random processes and the small parameter expansion approach are used in this work to examine the impact of random roughness on the electromagnetic flow in cylindrical micropipes. Utilizing the perturbation method, the analytical solution until second order velocity is achieved. The analytical expression of the roughness function ζ, which is defined as the deviation of the flow rate ratio with roughness to the case having no roughness in a smooth micropipe, is obtained by integrating the spectral density. The roughness function can be taken as the functions of the Hartmann number Ha and the dimensionless wave number λ. Two special corrugated walls of micropipes, i.e., sinusoidal and triangular corrugations, are analyzed in this work. The results reveal that the magnitude of the roughness function rises as the wave number increases for the same Ha. The magnitude of the roughness function decreases as the Ha increases for a prescribed wave number. In the case of sinusoidal corrugation, as the wave number λ increases, the Hartmann number Ha decreases, and the value of ζ increases. We consider the λ ranging from 0 to 15 and the Ha ranging from 0 to 5, with ζ ranging from −2.5 to 27.5. When the λ reaches 15, and the Ha is 0, ζ reaches the maximum value of 27.5. At this point, the impact of the roughness on the flow rate reaches its maximum. Similarly, in the case of triangular corrugation, when the λ reaches 15 and the Ha is 0, ζ reaches the maximum value of 18.7. In addition, the sinusoidal corrugation has a stronger influence on the flow rate under the same values of Ha and λ compared with triangular corrugation. Full article
(This article belongs to the Special Issue Microreactors and Their Applications)
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11 pages, 4196 KiB  
Article
A Low-Cost Microfluidic and Optically Transparent Water Antenna with Frequency-Tuning Characteristics
by
Abdullah Abdullah
,
Syed Imran Hussain Shah
,
Sakobyly Kiv
,
Jinwoo Ho
and
Sungjoon Lim
Micromachines 2023, 14(11), 2052; https://doi.org/10.3390/mi14112052 - 01 Nov 2023
Viewed by 683
Abstract
In this study, a novel microfluidic frequency reconfigurable and optically transparent water antenna is designed using three-dimensional (3D) printing technology. The proposed antenna consists of three distinct parts, including a circularly shaped distilled water ground, a sea water-based circular segmented radiator, and a [...] Read more.
In this study, a novel microfluidic frequency reconfigurable and optically transparent water antenna is designed using three-dimensional (3D) printing technology. The proposed antenna consists of three distinct parts, including a circularly shaped distilled water ground, a sea water-based circular segmented radiator, and a circularly shaped distilled water-based load, all ingeniously constructed from transparent resin material. The presented antenna is excited by a disk-loaded probe. The frequency of the antenna can be easily tuned by filling and emptying/evacuating sea water from the multisegmented radiator. The radiator consists of three segments with different radii, and each segment has a different resonant frequency. When the radiator is filled, the antenna resonates at the frequency of the segment that is filled. When all the radiator segments are filled, the antenna operates at the resonant frequency of 2.4 GHz and possesses an impedance bandwidth of 1.05 GHz (40%) in the range of 2.10–3.15 GHz. By filling different radiator segments, the frequency could be tuned from 2.4 to 2.6 GHz. In addition to the frequency-switching characteristics, the proposed antenna exhibits high simulated radiation efficiency (with a peak performance reaching 95%) and attains a maximum realized gain of 3.8 dBi at 2.9 GHz. The proposed antenna integrates water as its predominant constituent, which is easily available, thereby achieving cost-effectiveness, compactness, and transparency characteristics; it also has the potential to be utilized in future applications, involving transparent and flexible electronics. Full article
(This article belongs to the Special Issue Microreactors and Their Applications)
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Review

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24 pages, 6483 KiB  
Review
Biomedical Applications of Deformable Hydrogel Microrobots
by
Qinghua Cao
,
Wenjun Chen
,
Ying Zhong
,
Xing Ma
and
Bo Wang
Micromachines 2023, 14(10), 1824; https://doi.org/10.3390/mi14101824 - 24 Sep 2023
Viewed by 802
Abstract
Hydrogel, a material with outstanding biocompatibility and shape deformation ability, has recently become a hot topic for researchers studying innovative functional materials due to the growth of new biomedicine. Due to their stimulus responsiveness to external environments, hydrogels have progressively evolved into “smart” [...] Read more.
Hydrogel, a material with outstanding biocompatibility and shape deformation ability, has recently become a hot topic for researchers studying innovative functional materials due to the growth of new biomedicine. Due to their stimulus responsiveness to external environments, hydrogels have progressively evolved into “smart” responsive (such as to pH, light, electricity, magnetism, temperature, and humidity) materials in recent years. The physical and chemical properties of hydrogels have been used to construct hydrogel micro-nano robots which have demonstrated significant promise for biomedical applications. The different responsive deformation mechanisms in hydrogels are initially discussed in this study; after which, a number of preparation techniques and a variety of structural designs are introduced. This study also highlights the most recent developments in hydrogel micro-nano robots’ biological applications, such as drug delivery, stem cell treatment, and cargo manipulation. On the basis of the hydrogel micro-nano robots’ current state of development, current difficulties and potential future growth paths are identified. Full article
(This article belongs to the Special Issue Microreactors and Their Applications)
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