Journal of Ionic Liquids最新文献

{"title":"Direct method for microscale manipulation at liquid-liquid interfaces in ionic liquid media with real-time electron microscopy observation","authors":"","doi":"10.1016/j.jil.2024.100116","DOIUrl":"10.1016/j.jil.2024.100116","url":null,"abstract":"<div><div>A deep understanding of the processes in soft matter systems with liquid-liquid phase boundaries is of particular importance for materials science, chemistry and life sciences. A vast variety of physicochemical techniques have been proposed for the study of interfacial properties of liquid systems. Among them, electron microscopy methods occupy an important place due to the possibility of direct observation of the sample areas of interest with high spatial resolution; however, the harsh conditions of the electron microscope chamber impose significant restrictions on the possibilities of observing and manipulating unprotected liquids and related soft systems. To overcome these difficulties, in this work, we developed a methodology for direct probing of liquid-liquid interfaces with simultaneous control of the process using electron microscopy. Practically relevant liquid mixtures based on vacuum-compatible ionic liquid (IL) with water additives were probed with micrometer accuracy in real time inside an electron microscope chamber, which made it possible to reveal the role of specific ions aggregation and electrostatic phenomena in the stabilization of liquid microdomains. To test the versatility of the proposed approach, the morphology of a typical IL/water mixture was examined using a series of electron microscopes of various configurations, and it was shown that the best level of contrast between two chemically related liquid phases can be obtained in the case of a cold field emission electron source in combination with an in-lens secondary electron detector, regardless of the specific instrument manufacturer.</div></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic bactericidal activity of chlorhexidine loaded on positively charged ionic liquid-protected silver nanoparticles as a root canal disinfectant against Enterococcus faecalis: An ex vivo study","authors":"","doi":"10.1016/j.jil.2024.100117","DOIUrl":"10.1016/j.jil.2024.100117","url":null,"abstract":"<div><div>The advancement of nanotechnology and the development of nanocomplexes offer promising solutions to address the limitations in biofilm management within endodontics. Current cleaning and disinfection methods often fail to completely eliminate bacterial biofilms from the complex anatomical structures of root canals, making the invention of new disinfectants or disinfection methods highly relevant. Previously, chlorhexidine-loaded positively charged ionic liquid-protected silver nanoparticles (CHX@AgNPs⁺) were introduced as an innovative root canal irrigation solution, demonstrating significant antibacterial efficacy against <em>Enterococcus faecalis</em> in vitro. This study aimed to further evaluate the antibiofilm activity of CHX@AgNPs⁺ in the root canals of extracted human teeth contaminated with <em>E. faecalis</em> biofilm. Fifty single-rooted human teeth with mature apices were randomly assigned to five experimental groups based on the irrigants used: CHX@AgNPs⁺, AgNPs⁺, 2.5 % NaOCl, 2 % CHX, and normal saline (<em>n</em> = 10 per group). The root canals were contaminated with <em>E. faecalis</em>, and biofilm formation was confirmed. Initial sampling (S1) was performed, followed by mechanical preparation of the root canals using ProTaper F3 files and irrigation with the respective test solutions. Post-instrumentation sampling (S2) was then conducted. The results demonstrated that CHX@AgNPs⁺ exhibited antibiofilm properties comparable to 2.5 % NaOCl, with no significant difference between them. Additionally, CHX@AgNPs⁺ significantly enhanced antimicrobial efficacy compared to CHX alone (<em>P</em> &lt; 0.05), highlighting its potential as an effective root canal disinfectant.</div></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A review of CO2 capture for amine-based deep eutectic solvents","authors":"","doi":"10.1016/j.jil.2024.100114","DOIUrl":"10.1016/j.jil.2024.100114","url":null,"abstract":"<div><div>Carbon Dioxide can be naturally produced and make up of 0.04 percent in the earth's atmosphere. However, centuries by centuries follows by the modernization of humans, it has escalated to the state of causing inimical impacts towards the human and environment. Additionally, one of the most important fuel sources in the world, natural gas, in its raw state contains high levels of CO₂ that must be removed to avoid issue such heating value reduction and pipeline corrosion concurrently reduces the effect towards environment. To tackle this issue, the development of CO₂ absorbent capable of absorbing large amount of CO₂ hence reducing the effects it has towards the environment has become a topic among researchers this past decades. Conventionally, the use of amine such as alkanolamine have been implemented to capture CO₂, yet it flaws outclass its uses such as limited ability to take up CO₂ and high corrosivity. Following this, ionic liquids (ILs), a new species of solvent, came to be in the limelight since they are tunable according to their function, including carbon capture. Nonetheless, in recent years, a newly discovered green solvent, deep eutectic solvent (DES) stole the limelight. This absorbent was claimed to retain all the advantages and desirable properties of ionic liquids while eliminating some of their greatest limitations. In this review, we examined the potential for carbon capture using multiple amine-based deep eutectic solvents and explored the role of including a third compartment as a performance enhancement mechanism. Last but not least, we are anticipating the publication of future species of amine-based deep eutectic solvents, which will include more information that had previously been considered scarce, such as its level of toxicity, its economic validation, and the evidence of melting point reduction.</div></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermophysical properties, and figures-of-merit analyses of nanodiamond/CuO ionanofluids: Experimental and artificial neural network predictions","authors":"","doi":"10.1016/j.jil.2024.100113","DOIUrl":"10.1016/j.jil.2024.100113","url":null,"abstract":"<div><div>The nanodiamond/copper oxide (ND/CuO) nanoparticles were dispersed into 1-ethyl-3-methylimidazolium chloride [EMiM]Cl to create ionanofluids. The experiments were performed to analyse the thermophysical properties under particle volume loadings from 0.2 % to 1.0 %, and temperature ranging from 30 to 60 °C. Theoretical approach was made to understand the Figures-of-Merit (FoM) of the prepared ionanofluids, while they flow in a tube, and helical coil through the evaluated thermophysical properties. The lower thermal conductivity augment of 14.27 % was noticed at 0.2% vol. and larger thermal conductivity enhancement of 35.20 % was noticed at 1.0% vol. and at a temperature of 60 °C, against the base fluid. Moreover, the viscosity of 1.0% vol. of ionanofluid was enhanced by 61.66 % at a temperature of 30 °C, over the base fluid. The other properties like density was increased with an increase of volume loadings, and specific heat was decreased with an increase of volume loadings. The FoM results indicated that, all the prepared volume concentrations of ionanofluids flow in a tube was benefited fluid when the fluid operating temperature was exceeds to 35 °C, on the other side, the prepared ionanofluids flow in a helical coil was benefited fluid when its operating temperature was above 30 °C for 0.8 %, and 1.0% vol. loadings. The estimated thermophysical properties were also used as input and output data for an artificial neural network of Levenberg-Marquardt (LM) algorithm. It is noticed from the LM algorithm results, the predicted data is well agreed with an experimental data. For all the data, the correlation coefficient (R²) of thermal conductivity is 0.99283, viscosity is 0.9971, density is 0.99887, and specific heat is 0.99817, was observed, respectively.</div></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anion exchange effect on structural, antibacterial activity and molecular docking of 1-methyl-3-(4-vinylbenzyl) imidazol-3-ium chloride/bis(trifluoromethylsulfonyl)imide/hexaflurophosphate: Experimental and DFT approach","authors":"","doi":"10.1016/j.jil.2024.100115","DOIUrl":"10.1016/j.jil.2024.100115","url":null,"abstract":"<div><div>The impact of NTF₂⁻ and PF₆⁻ anions on the physical, chemical and antibacterial characteristics of ionic liquids (ILs) based 1-methyl-3-(4-vinylbenzyl) imidazol-3-ium VBMIM⁺ cations is the subject of this work. The molecular structures were compared to the DFT-optimized ones after being investigated experimentally using FTIR and NMR spectroscopy. As a result, the different vibrational modes were identified and assigned. However, DSC and TGA have been used to examine the thermal properties of the ILs. The compounds depicted good thermal stability. Furthermore, different parameters were computed to get insights on the stability and reactivity of the chemical. The ILs were tested for their antibacterial and fungicidal activities against nine reference strains of gram-negative and gram-positive bacteria. Finally, the discovered biological results were supported by the molecular docking analysis.</div></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stability of melatonin in eutectic systems: New avenues in therapeutic product development","authors":"","doi":"10.1016/j.jil.2024.100112","DOIUrl":"10.1016/j.jil.2024.100112","url":null,"abstract":"<div><p>Melatonin is an indoleamine with functions as neurohormone, that is well known as pharmaceutical or healthcare product. Like many pharmaceutical compounds, melatonin is recognized to be an unstable molecule, principally sensitive to light and high temperatures. Storage conditions, including temperature and light, over different storage periods have been considered as important factors in melatonin degradation. This research describes for the first time, the utilization of natural deep eutectic solvents (NADES) as green alternatives to organic solvents for improving the stability of the hormone under various storage conditions. The results showed that temperature and light effect on melatonin content during the storage presented a diverse behavior according to the solvent. At low temperatures, the hydrophilic eutectic systems based on choline chloride-glycerol and lactic acid-glucose, along with water, were the most effective in extending the shelf life of the hormone compared to conventional solvents. However, at high temperature, this behavior was reversed. Regarding the effect of light, it significantly affects the stability of melatonin, primarily UV exposure. The eutectic systems appear to be the best medium for melatonin stability under this condition. These findings highlight the potential of NADES for their protective role in the stability of the compound that could be explained in terms of their viscosity and the hydrogen bond interactions within the solute and the eutectic systems.</p></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772422024000351/pdfft?md5=c670003b7ae522b9532e4c7e45639d9c&pid=1-s2.0-S2772422024000351-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142274630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sustainable and versatile Aza-Michael additions promoted by acidic ionic liquids","authors":"","doi":"10.1016/j.jil.2024.100111","DOIUrl":"10.1016/j.jil.2024.100111","url":null,"abstract":"<div><p>Acidic ionic liquids are a subset of ionic liquids where the cation or anion possess acidic properties with huge applications in various fields. Here we describe environmentally safe and highly efficient conjugate addition of aromatic and aliphatic amines to α, β-unsaturated compounds in the presence of novel acidic ionic liquids. The acidic ionic liquid catalyst was prepared by combining benzyl chloride with 2-(dimethylamino) ethanol and SnCl₂ in a simpler manner. The resulting acidic ionic liquid was characterized using SEM, EDS and FTIR spectroscopy. In the presence of ionic liquids, a wide variety of amines undergo facile conjugate addition to α, β-unsaturated compounds affording the corresponding β-amino compounds in good to excellent yields (72–97 %), shorter reaction times (1–4 h) and mild reaction conditions (60 °C). Furthermore, the study demonstrated the sustainability of the process by showcasing that the acidic ionic liquids could be reclaimed and reused for up to five cycles without compromising their catalytic effectiveness.</p></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S277242202400034X/pdfft?md5=3207224614e018fdfabad8e5a2de36f7&pid=1-s2.0-S277242202400034X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142233008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zn-containing ionic liquids as effective catalysts for the condensation of camphor with diamines","authors":"","doi":"10.1016/j.jil.2024.100110","DOIUrl":"10.1016/j.jil.2024.100110","url":null,"abstract":"<div><p>The study is dedicated to the investigation of the catalytic activity of zinc carboxylates in the condensation reaction of camphor with aliphatic diamines. The reaction of camphor with 1,6-hexanediamine was selected as the model system. The research demonstrated that the reaction does not proceed without a catalyst, while the use of zinc carboxylates as catalysts leads to a higher conversion and selectivity compared to the classical catalyst for this reaction, Et₂O∙BF₃. The best results were achieved using zinc 2-ethylhexanoate, which provided an 88.4 % conversion of camphor and a 76.9 % selectivity for the formation of diimine. It was established that the catalytic activity of zinc carboxylates in the condensation reaction of camphor with diamines is related to the structure of the acid residue of the salt. Based on the obtained data, a reaction mechanism was proposed, associated with the formation of a complex between the zinc carboxylate and the initial amine, which is confirmed by FTIR and UV–vis spectroscopic data.</p></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772422024000338/pdfft?md5=0b2420832c8fbf2c04ee7ee81faed6cf&pid=1-s2.0-S2772422024000338-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142097025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of anion α-functionalization on the water affinity of thermo-responsive phosphonium acetate-derived ionic liquids","authors":"","doi":"10.1016/j.jil.2024.100107","DOIUrl":"10.1016/j.jil.2024.100107","url":null,"abstract":"<div><p>This study presents a facile method for assessing the effect of anion functional group substitution on the water affinity of phosphonium-acetate ionic liquids. By combining the same cation with three different α-substituted carboxylate anions, the effect of anion functional group substitution on the IL miscibility with water and hygroscopicity was experimentally evaluated and rationalized using COSMO-RS sigma profile analysis. Lower critical solution temperature (LCST) phase separation experiments and water vapor partial pressure measurements revealed that there is a stark α-substitution dependency on the affinity of water for acetate [AcO], pivalate [PivO], and trifluoroacetate [TFA] derived tributyl(octyl)phosphonium [P₄₄₄₈] ILs. It was found that the IL water affinities varied as: [P₄₄₄₈][AcO] &gt; [P₄₄₄₈][PivO] &gt; [P₄₄₄₈][TFA]. With the lowest water partial pressure and no LCST driven phase separation, [P₄₄₄₈][AcO] exhibited a high affinity for water. On the other hand, [P₄₄₄₈][PivO] and [P₄₄₄₈][TFA] exhibited LCST-driven phase separation and room temperature immiscibility, respectively, with higher water partial pressures, as a result of relatively weak water affinities. COSMO-RS sigma profile analysis revealed that the aliphatic carboxylate anions should incorporate apolar interactions commensurate with or greater than the polar hydrogen bond acceptor interactions for phase immiscibility of the corresponding IL with water. It was found that the relative magnitudes of apolar and polar interactions, assessed using the anion sigma profile peak intensity ratio (<em>I_r</em>), are directly correlated with the IL water affinity, and inversely correlated with the solution water activity coefficient. Therefore, it was concluded that <em>I_r</em> forms a quantitative link between the structural changes at the molecular level and the bulk water affinity exhibited by the ionic liquid as a whole.</p></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772422024000302/pdfft?md5=8f2a742e47ac517ffdc08cc81aa134b3&pid=1-s2.0-S2772422024000302-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141953600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The combination of taurine and cepharanthine as a composite antibacterial agent","authors":"","doi":"10.1016/j.jil.2024.100108","DOIUrl":"10.1016/j.jil.2024.100108","url":null,"abstract":"<div><p>The indiscriminate application of diverse broad-spectrum antimicrobials has escalated nosocomial infections into a critical global public health quandary. Currently, traditional antibiotics' efficacy against these infections becomes limited, necessitating a concerted pursuit of more efficacious antimicrobial agents. It is noteworthy that taurine (tau) and cepharanthine (cep) are both biologically active compounds, with taurine constituting a vital nutrient to human health and cepharanthine exhibiting certain antibacterial attributes. However, while cepharanthine displays intrinsic antibacterial features, its monomeric utility is constrained. This study thus investigated the formulation process of merging taurine with cepharanthine, and rigorously assessed the antimicrobial potential of the taurine-cepharanthine complex (denoted as [cep][tau]). The outcomes indicated that this complex, [cep][tau], exhibited antibacterial activity against <em>Staphylococcus aureus</em> and <em>Klebsiella pneumoniae</em>, which was on par with the efficacy of cepharanthine on its own. This observation implies that taurine did not antagonize the antibacterial potency of cepharanthine, offering novel avenues for the development of innovative pharmaceuticals targeting hospital-acquired infections.</p></div>","PeriodicalId":100794,"journal":{"name":"Journal of Ionic Liquids","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772422024000314/pdfft?md5=82070fedc5b091f66dd2f73331a68625&pid=1-s2.0-S2772422024000314-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141850628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}