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Exclusive Feature Papers in Microwave Chemistry
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Exclusive Feature Papers in Microwave Chemistry

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Microwave Chemistry".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 7120

Special Issue Editor

Prof. Dr. Maryline Abert-Vian

E-Mail Website
Guest Editor
GREEN Extraction Team, INRAE, UMR 408, University of Avignon, F-84000 Avignon, France
Interests: green extraction; alternative solvent; natural products; green chemistry; biomass; biorefinery; bioeconomy; byproduct
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are pleased to announce the Special Issue entitled “Exclusive Feature Papers in Microwave Chemistry”. This is a collection of important high-quality papers (original research articles or comprehensive review papers) published in open access format by Editorial Board Members or prominent scholars invited by the Editorial Office and the Guest Editors. This Special Issue aims to discuss new knowledge or new cutting-edge developments in the microwave chemistry field through selected works, in the hope of making a great contribution to the community. We intend for this issue to be the best forum for disseminating excellent research findings as well as sharing innovative ideas in the field.

Dr. Maryline Abert-Vian
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. Molecules is an international peer-reviewed open access semimonthly 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 2700 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

  • microwave-assisted extraction (MAE)
  • drying process
  • natural products
  • synthesis
  • intensification

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Published Papers (3 papers)

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Research

11 pages, 2241 KiB  
Article
Batch and Flow Synthesis of CeO2 Nanomaterials Using Solid-State Microwave Generators
by Cristina Rodríguez-Carrillo, Juan Torres García, Miriam Benítez, Jamal El Haskouri, Pedro Amorós and Jose V. Ros-Lis
Molecules 2022, 27(9), 2712; https://doi.org/10.3390/molecules27092712 - 22 Apr 2022
Cited by 6 | Viewed by 1851
Abstract
Microwave-assisted synthesis in combination with flow synthesis offers an interesting approach to develop faster and more sustainable procedures for the preparation of homogeneous nanomaterials. Recently, solid-state generators of microwaves appeared as a tool with improved control over power and frequency. Cerium oxide, despite [...] Read more.
Microwave-assisted synthesis in combination with flow synthesis offers an interesting approach to develop faster and more sustainable procedures for the preparation of homogeneous nanomaterials. Recently, solid-state generators of microwaves appeared as a tool with improved control over power and frequency. Cerium oxide, despite its excellent catalytic activity, has not been prepared before using solid-state generators or microwave-assisted flow chemistry. We report a procedure for the preparation of nanoparticulated CeO2 (around 4 nm) under 2.45 GHz microwaves in only 30 s. The materials are further calcined at 800 °C to increase particle size, with a better defined particle size and crystallinity. The procedure was tested in batch at pH 11 and 12 and diverse potencies, and the products were characterized by TEM, XRD, DLS, and N2 adsorption–desorption isotherms. The materials were similar at the diverse pH values and potencies. XRD confirms the crystallinity of the CeO2 material with a fluorite-like structure. They are composed of particles around 40 nm that aggregate as structures of around 100 nm. The procedure was successfully adapted to flow synthesis, obtaining materials with structure and properties equivalent to batch synthesis. The batch and flow materials offer peroxidase properties, opening the door for their use as ROS scavengers. Full article
(This article belongs to the Special Issue Exclusive Feature Papers in Microwave Chemistry)
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14 pages, 7610 KiB  
Article
Microwave-Assisted Ionic Liquid-Catalyzed Selective Monoesterification of Alkylphosphonic Acids—An Experimental and a Theoretical Study
by Nikoletta Harsági, Réka Henyecz, Péter Ábrányi-Balogh, László Drahos and György Keglevich
Molecules 2021, 26(17), 5303; https://doi.org/10.3390/molecules26175303 - 31 Aug 2021
Cited by 8 | Viewed by 2008
Abstract
It is well-known that the P-acids including phosphonic acids resist undergoing direct esterification. However, it was found that a series of alkylphoshonic acids could be involved in monoesterification with C2–C4 alcohols under microwave (MW) irradiation in the presence of [bmim][BF [...] Read more.
It is well-known that the P-acids including phosphonic acids resist undergoing direct esterification. However, it was found that a series of alkylphoshonic acids could be involved in monoesterification with C2–C4 alcohols under microwave (MW) irradiation in the presence of [bmim][BF4] as an additive. The selectivity amounted to 80–98%, while the isolated yields fell in the range of 61–79%. The method developed is a green method for P-acid esterification. DFT calculations at the M062X/6–311+G (d,p) level of theory (performed considering the solvent effect of the corresponding alcohol) explored the three-step mechanism, and justified a higher enthalpy of activation (160.6–194.1 kJ·mol−1) that may be overcome only by MW irradiation. The major role of the [bmim][BF4] additive is to increase the absorption of MW energy. The specific chemical role of the [BF4] anion of the ionic liquid in an alternative mechanism was also raised by the computations. Full article
(This article belongs to the Special Issue Exclusive Feature Papers in Microwave Chemistry)
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13 pages, 4652 KiB  
Article
Microwave-Assisted Defibrillation of Microalgae
by Frederik L. Zitzmann, Ewan Ward, Xiangju Meng and Avtar S. Matharu
Molecules 2021, 26(16), 4972; https://doi.org/10.3390/molecules26164972 - 17 Aug 2021
Cited by 5 | Viewed by 2693
Abstract
The first production of defibrillated celluloses from microalgal biomass using acid-free, TEMPO-free and bleach-free hydrothermal microwave processing is reported. Two routes were explored: i. direct microwave process of native microalgae (“standard”), and ii. scCO2 pre-treatment followed by microwave processing. ScCO2 was [...] Read more.
The first production of defibrillated celluloses from microalgal biomass using acid-free, TEMPO-free and bleach-free hydrothermal microwave processing is reported. Two routes were explored: i. direct microwave process of native microalgae (“standard”), and ii. scCO2 pre-treatment followed by microwave processing. ScCO2 was investigated as it is commonly used to extract lipids and generates considerable quantities of spent algal biomass. Defibrillation was evidenced in both cases to afford cellulosic strands, which progressively decreased in their width and length as the microwave processing temperature increased from 160 °C to 220 °C. Lower temperatures revealed aspect ratios similar to microfibrillated cellulose whilst at the highest temperature (220 °C), a mixture of microfibrillated cellulose and nanocrystals were evidenced. XRD studies showed similar patterns to cellulose I but also some unresolved peaks. The crystallinity index (CrI), determined by XRD, increased with increasing microwave processing temperature. The water holding capacity (WHC) of all materials was approximately 4.5 g H2O/g sample. The materials were able to form partially stable hydrogels, but only with those processed above 200 °C and at a concentration of 3 wt% in water. This unique work provides a new set of materials with potential applications in the packaging, food, pharmaceutical and cosmetic industries. Full article
(This article belongs to the Special Issue Exclusive Feature Papers in Microwave Chemistry)
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