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Crystals
Special Issues
Disclosing Deep Eutectic Solvents
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Disclosing Deep Eutectic Solvents

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Macromolecular Crystals".

Deadline for manuscript submissions: closed (31 December 2023) | Viewed by 5244

Special Issue Editors

Dr. Lorenzo Gontrani

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Guest Editor
Department of Chemistry, Università di Roma “La Sapienza”, 00185 Roma, Italy
Interests: ionic and molecular liquids; deep eutectic solvents; metal oxide nanoparticles; computational chemistry; quantum mechanics methods; molecular simulations/dynamics; X-Ray diffraction; infrared spectroscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Matteo Bonomo

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Guest Editor
Department of Chemistry, University of Turin, 10125 Turin, Italy
Interests: photovoltaic; dye-sensitized solar cells; perovskite solar cells; deep eutectic solvents; ionic liquids
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Marilena Carbone

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Guest Editor
Department of Chemical Science and Technologies, University of Rome Tor Vergata, 000133 Roma, Italy
Interests: nanoparticles with electrochemical and biomedical applications; tattoo inks, determination of the composition and removal; surface science, molecules on semiconductors for detection purposes
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is related to the investigation/characterization of the structural and technological properties of existing and newly prepared deep eutectic solvents. These innovative and fascinating materials, obtained by simple mixing of organic and/or inorganic salts, share incredibly versatile and valuable properties, firstly the possibility of preparing them from atoxic and environmentally sustainable raw materials, and have attracted much attention since their first description at the beginning of the 21st century. An increasing number of applications is being reported in the fields of catalysis, metal extraction processes, nanoparticle synthesis, and electrochemistry, to name a few. Regarding more specifically crystalline materials, DES have been used as structure-directing agents in the ionothermal synthesis of porous solids such as zeolites and in the polymorphic/macromorphological control of active pharmaceutical ingredients.

The aforementioned properties are deeply rooted in the microscopic structure of the eutectic phase, where ions and molecules are involved in a strong and highly directional hydrogen bond network that often restricts the allowed ratio between components necessary for mixing.

Researchers working in this field are cordially invited to contribute original research papers or reviews to this Special Issue of Crystals. The potential topics include but are not limited to:

  • Synthesis of new DES;
  • Characterization by spectroscopic, X-Ray/neutron diffraction microscopic, electrochemical, and other advanced techniques;
  • Exploitation of the remarkable properties of DES in various existent and emerging applications. 

Dr. Lorenzo Gontrani
Dr. Matteo Bonomo
Prof. Dr. Marilena Carbone
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. Crystals 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

  • Sustainability
  • Green chemistry
  • Salts
  • Mixtures
  • Structure
  • New materials

Published Papers (2 papers)

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Research

15 pages, 2654 KiB  
Article
Mix-and-Match Diols: Adjusting Self-Assembly of Micellar Phases in Choline Chloride Eutectics
by Oliver S. Hammond, Adrian Sanchez-Fernandez, Rachel Tyte, Robert Dalgliesh, Andrew J. Smith and Karen J. Edler
Crystals 2022, 12(11), 1621; https://doi.org/10.3390/cryst12111621 - 12 Nov 2022
Cited by 1 | Viewed by 1572
Abstract
The common Deep Eutectic Solvent (DES) ‘ethaline’ (1:2 choline chloride:ethylene glycol) was examined here as a basis for the self-assembly of the surfactant dodecyltrimethylammonium bromide (C12TAB). A phase diagram was constructed, showing evidence for a L1 (micellar) phase, confirmed by [...] Read more.
The common Deep Eutectic Solvent (DES) ‘ethaline’ (1:2 choline chloride:ethylene glycol) was examined here as a basis for the self-assembly of the surfactant dodecyltrimethylammonium bromide (C12TAB). A phase diagram was constructed, showing evidence for a L1 (micellar) phase, confirmed by tensiometry to have a room temperature critical micelle concentration (CMC) of 1.2 wt.%. Small angle neutron scattering (SANS) measurements indicate formation of interacting globular micelles with slightly smaller apparent radii than in water. The apparent mesophase/multiphase region was studied using SWAXS, demonstrating rich mesoscopic lyotropic liquid crystalline phase behaviour, with evidence for lamellar Lα peaks, alongside potential co-crystalline phases. We attempted to tailor the self-assembly by studying binary DES containing longer diols including 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol, and ternary DES where the HBD component was a 1:1 ethylene glycol:diol mixture. However, synchrotron SAXS showed that only ternary ‘propethaline’ mixtures displayed signs of self-assembly and micellization, perhaps due to the reduction in calculated Gordon parameter, which decreases linearly with increasing alkyl chain length. Systematic differences were thus observed in the ability of the solvents to modulate assembly, from globular micelles in ChCl:EG, to weaker assembly in long-tail DES, and complete solubilisation in butaline and pentaline. Full article
(This article belongs to the Special Issue Disclosing Deep Eutectic Solvents)
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12 pages, 1198 KiB  
Article
Effect of Hydrated Deep Eutectic Solvents on the Thermal Stability of DNA
by Mariagrazia Tortora, Jacopo Vigna, Ines Mancini, Andrea Mele, Alessandro Gessini, Claudio Masciovecchio and Barbara Rossi
Crystals 2021, 11(9), 1057; https://doi.org/10.3390/cryst11091057 - 2 Sep 2021
Cited by 7 | Viewed by 2713
Abstract
DNA’s structure stability in hydrated deep eutectic solvents (DESs) is getting growing attention for emerging bio-applications. The employment of DESs as novel co-solvents in water media could favor eco-friendly and biodegradable materials for DNA storage and handling. Understanding the molecular interactions between nucleic [...] Read more.
DNA’s structure stability in hydrated deep eutectic solvents (DESs) is getting growing attention for emerging bio-applications. The employment of DESs as novel co-solvents in water media could favor eco-friendly and biodegradable materials for DNA storage and handling. Understanding the molecular interactions between nucleic acids and aqueous DES is crucial for developing new-generation solvents for biomolecules. In this work, we exploit the molecular sensitivity and selectivity of synchrotron radiation UV resonance raman (SR-UVRR) spectroscopy to explore the interplay between a choline chloride:urea (ChCl:U) DES and double-stranded DNA. Our study analyzes the impact of ChCl:U on the DNA’s thermal unfolding pathway by focusing on the guanine nucleobases whose Raman signal could be strongly enhanced through careful tuning of the excitation wavelength. Full article
(This article belongs to the Special Issue Disclosing Deep Eutectic Solvents)
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