Search results for "Ionogels"

Ionogels: Multifaced Materials

Insights into the Formation and Structures of Molecular Gels by Diimidazolium Salt Gelators in Ionic Liquids or “Normal” Solvents

2016

Insights are provided into the properties of molecular gels formed by diimidazolium salts both in “normal” solvents and ionic liquids. These materials can be interesting for applications in green and sustainable chemistry in which ionic liquids play a significant role, like catalysis and energy. In particular, two positional isomers of a diimidazolium cation have been examined with a wide range of anions for their ability to form gel phases. In particular, di-, tri-, and tetravalent anions bearing aliphatic or aromatic spacers were paired with the divalent cations. The properties of the organo- and ionogels formed have been analyzed by means of several different techniques, including calori…

Walking through Soft Materials to Join Supramolecular Gels: An Overview about the Properties and Applications

The class of soft materials includes a large variety of species arising from self-assembly processes and held by non-covalent interactions. This confers peculiar features, allowing applications in very different fields.1 Among soft materials, supramolecular gel phases have aroused a surge of interest.2 These materials combine properties of liquid phase with the ones of a semi-solid network and the large number of gelator/solvent combinations can offer answer to issues of different nature.3 This lecture will show on overview about the obtainment and characterization of gel phases, in the attempt to understand the relationship working between gelator and solvent nature and gel phase propertie…

Anion and ionic liquid effects on ionogel phases formation

Geminal organic salts have been recently introduced as the third generation of ionic liquids.1 Like their monocationic precursors they generally show high thermal stability and low corrosiveness, as well as high polarity and structural order degree.2 All these features make them good candidates to be used in the formation of conductive gel phases, that afterwards may find application as organized reaction media or in the preparation of dye sensitized solar cells.3 In this context, we have recently synthesized some task specific geminal organic salts and investigated their behaviour as gelators. The obtained salts were able to gel ionic liquid solutions. In order to have information about th…

Supramolecular Hydro- and Ionogels: A Study of Their Properties and Antibacterial Activity.

2017

Diimidazolium-based organic salts, bearing peptides or amino acids as anions have been synthesised and tested for their gelling ability in biocompatible solvents. These low molecular weight salts were successfully used as gelators in phosphate buffered saline (PBS) solution and ionic liquids. Then, the properties of the obtained soft materials were analysed in terms of melting temperature and gel strength as accounted for by rheological investigations. The gel-phase formation was studied by using UV/Vis and resonance light scattering measurements, whereas the morphology of the soft materials was analysed by using polarised optical microscopy and scanning electron microscopy. To get informat…

Diimidazolium organic salts and supramolecular gels exerting antimicrobial activity

The importance of supramolecular reaction media in catalysis

Biopolymer-based Ionic Liquid gels: sustainable antioxidant and antimicrobial materials

Ionogels formed by geminal imidazolium salts: a preliminary investigation

Nitrogen-Doped Carbon Nanodots-Ionogels: Preparation, Characterization, and Radical Scavenging Activity

2018

Hybrid diimidazolium-based ionogels were obtained by dispersing nitrogen-doped carbon nanodots (NCNDs) in ionic liquid (IL) solutions and by using dicationic organic salts as gelators. The properties of the NCND-ionogels were studied in terms of thermal stability, mechanical strength, morphology, rheological, and microscopic analyses. Insights into the formation of the hybrid soft material were attained from kinetics of sol-gel phase transition and from estimating the size of the aggregates, obtained from opacity and resonance light-scattering measurements. We demonstrate that, on one hand, NCNDs were able to favor the gel formation both in the presence of gelating and nongelating ILs. On t…