Gotowe bibliografie tematyczne / Deep eutectic solvent-based systems

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Gotowa bibliografia na temat „Deep eutectic solvent-based systems”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Deep eutectic solvent-based systems"

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Liu, Xiangwei, Qian Ao, Shengyou Shi i Shuie Li. "CO2 capture by alcohol ammonia based deep eutectic solvents with different water content". Materials Research Express 9, nr 1 (1.01.2022): 015504. http://dx.doi.org/10.1088/2053-1591/ac47c6.

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Abstract The existing CO2 absorption by deep eutectic solvents is limited by the unavoidable water absorption problem during use. In this study, we prepared three deep eutectic solvents with different alcohol aminations and added different water contents to discuss the effect of water content on the absorption of carbon dioxide by deep eutectic solvents. All deep eutectic solvents have a low melting point at room temperature as a liquid and have high thermal stability, where the choline chloride-diethanolamine deep eutectic solvents have a high viscosity. Anhydrous choline chloride-monoethanolamine deep eutectic solvents have the largest CO2 absorption, reaching 0.2715 g g−1, and the absorption of CO2 by anhydrous choline chloride-N-methyldiethanolamine deep eutectic solvents is only 0.0611 g g−1. Water content inhibited the absorption of CO2 in primary amine and secondary amine systems, whereas it enhanced the absorption of CO2 in tertiary amine systems, which was related to the reaction process of deep eutectic solvent and CO2.
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Majová, Veronika, Silvia Horanová, Andrea Škulcová, Jozef Šima i Michal Jablonský. "Deep eutectic solvent delignification: Impact of initial lignin". BioResources 12, nr 4 (21.08.2017): 7301–10. http://dx.doi.org/10.15376/biores.12.4.7301-7310.

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This study aimed to resolve the issue of the lack of detailed understanding of the effect of initial lignin content in hardwood kraft pulps on pulp delignification by deep eutectic solvents. The authors used Kappa number of the concerned pulp, intrinsic viscosity, and selectivity and efficiency of delignification as the parameters of the effect. The pulp (50 g oven dry pulp) was treated with four different DESs systems based on choline chloride with lactic acid (1:9), oxalic acid (1:1), malic acid (1:1), and system alanine:lactic acid (1:9); the results were compared to those reached by oxygen delignification. The results showed that the pulp with a higher initial lignin content had a greater fraction of easily removed lignin fragments.
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Vuksanovic, Jelena, Nina Todorovic, Mirjana Kijevcanin, Slobodan Serbanovic i Ivona Radovic. "Experimental investigation and modeling of thermophysical and extraction properties of choline chloride + DL-malic acid based deep eutectic solvent". Journal of the Serbian Chemical Society 82, nr 11 (2017): 1287–302. http://dx.doi.org/10.2298/jsc170316054v.

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The ability of non-toxic and biodegradable deep eutectic solvent (DES) choline chloride + DL-malic acid in mole ratio 1:1, for the breaking of the azeotropes heptane + methanol and toluene + methanol by means of liquid? ?liquid extraction was evaluated. Ternary liquid?liquid equilibrium experiments were performed at 298.15 K and at atmospheric pressure. Densities, viscosities and refractive indices of DES + methanol and water + DES systems were experimentally determined over a wide temperature range and at atmospheric pressure. Additionally, the viscosities of DES + glycerol mixture were - determined at temperatures up to 363.15 K to check how much the addition of glycerol decreases high viscosities of DES. The results indicate that the addition of small amounts of water or glycerol as a third component significantly decreases the viscosity of the investigated deep eutectic solvent. Based on the selectivity and distribution ratio values, the extraction ability of the investigated deep eutectic solvent, in comparison with the conventionally used solvents, yields promising results. Non-random two-liquid (NRTL) and universal quasichemical (UNIQUAC) models were satisfactorily applied for correlation of experimental phase equilibrium data for two ternary mixtures.
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Dugoni, Greta Colombo, Maria E. Di Pietro, Monica Ferro, Franca Castiglione, Steven Ruellan, Tarek Moufawad, Leila Moura, Margarida F. Costa Gomes, Sophie Fourmentin i Andrea Mele. "Effect of Water on Deep Eutectic Solvent/β-Cyclodextrin Systems". ACS Sustainable Chemistry & Engineering 7, nr 7 (marzec 2019): 7277–85. http://dx.doi.org/10.1021/acssuschemeng.9b00315.

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Schuur, Boelo, Thomas Brouwer i Lisette M. J. Sprakel. "Recent Developments in Solvent-Based Fluid Separations". Annual Review of Chemical and Biomolecular Engineering 12, nr 1 (7.06.2021): 573–91. http://dx.doi.org/10.1146/annurev-chembioeng-102620-015346.

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The most important developments in solvent-based fluid separations, separations involving at least one fluid phase, are reviewed. After a brief introduction and discussion on general solvent trends observed in all fields of application, several specific fields are discussed. Important solvent trends include replacement of traditional molecular solvents by ionic liquids and deep eutectic solvents and, more recently, increasing discussion around bio-based solvents in some application fields. Furthermore, stimuli-responsive systems are discussed; the most significant developments in this field are seen for CO2-switchable and redox-responsive solvents. Discussed fields of application include hydrocarbons separations, carbon capture, biorefineries, and metals separations. For all but the hydrocarbons separations, newly reported electrochemically mediated separations seem to offer exciting new windows of opportunities.
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Park, Tae-Joon, i Sang Hyun Lee. "Deep eutectic solvent systems for FeCl3-catalyzed oxidative polymerization of 3-octylthiophene". Green Chemistry 19, nr 4 (2017): 910–13. http://dx.doi.org/10.1039/c6gc02789j.

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Teixeira, Gabriel, Dinis O. Abranches, Liliana P. Silva, Sérgio M. Vilas-Boas, Simão P. Pinho, Ana I. M. C. L. Ferreira, Luís M. N. B. F. Santos, Olga Ferreira i João A. P. Coutinho. "Liquefying Flavonoids with Terpenoids through Deep Eutectic Solvent Formation". Molecules 27, nr 9 (20.04.2022): 2649. http://dx.doi.org/10.3390/molecules27092649.

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The formation of deep eutectic solvents (DES) is tied to negative deviations to ideality caused by the establishment of stronger interactions in the mixture than in the pure DES precursors. This work tested thymol and menthol as hydrogen bond donors when combined with different flavonoids. Negative deviations from ideality were observed upon mixing thymol with either flavone or flavanone, two parent flavonoids that only have hydrogen bond acceptor (HBA) groups, thus forming non-ionic DES (Type V). On the other hand, the menthol systems with the same compounds generally showed positive deviations from ideality. That was also the case with the mixtures containing the more complex hydroxylated flavonoid, hesperetin, which resulted in positive deviations when mixed with either thymol or menthol. COSMO-RS successfully predicted the behavior of the solid-liquid phase diagram of the studied systems, allowing for evaluation of the impact of the different contributions to the intermolecular interactions, and proving to be a good tool for the design of DES.
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Abdallah, Maha M., Simon Müller, Andrés González de Castilla, Pavel Gurikov, Ana A. Matias, Maria do Rosário Bronze i Naiara Fernández. "Physicochemical Characterization and Simulation of the Solid–Liquid Equilibrium Phase Diagram of Terpene-Based Eutectic Solvent Systems". Molecules 26, nr 6 (23.03.2021): 1801. http://dx.doi.org/10.3390/molecules26061801.

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The characterization of terpene-based eutectic solvent systems is performed to describe their solid–liquid phase transitions. Physical properties are measured experimentally and compared to computed correlations for deep eutectic solvents (DES) and the percentage relative error er for the density, surface tension, and refractive index is obtained. The thermodynamic parameters, including the degradation, glass transition and crystallization temperatures, are measured using DSC and TGA. Based on these data, the solid–liquid equilibrium phase diagrams are calculated for the ideal case and predictions are made using the semi-predictive UNIFAC and the predictive COSMO RS models, the latter with two different parametrization levels. For each system, the ideal, experimental, and predicted eutectic points are obtained. The deviation from ideality is observed experimentally and using the thermodynamic models for Thymol:Borneol and Thymol:Camphor. In contrast, a negative deviation is observed only experimentally for Menthol:Borneol and Menthol:Camphor. Moreover, the chemical interactions are analyzed using FTIR and 1H-NMR to study the intermolecular hydrogen bonding in the systems.
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Marchel, Mateusz, Ana Sofia Coroadinha i Isabel M. Marrucho. "Novel Acidic Deep Eutectic Solvent-Based Aqueous Biphasic Systems for Efficient Extraction of Pepsin". ACS Sustainable Chemistry & Engineering 8, nr 33 (22.07.2020): 12400–12408. http://dx.doi.org/10.1021/acssuschemeng.0c02673.

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Farias, Fabiane Oliveira, Helena Passos, João A. P. Coutinho i Marcos R. Mafra. "pH Effect on the Formation of Deep-Eutectic-Solvent-Based Aqueous Two-Phase Systems". Industrial & Engineering Chemistry Research 57, nr 49 (19.11.2018): 16917–24. http://dx.doi.org/10.1021/acs.iecr.8b04256.

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Rozprawy doktorskie na temat "Deep eutectic solvent-based systems"

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Bezold, Franziska [Verfasser], Mirjana [Akademischer Betreuer] Minceva, Irina [Gutachter] Smirnova, Mirjana [Gutachter] Minceva i Harald [Gutachter] Klein. "Deep eutectic solvent- and ionic liquid-based biphasic systems in centrifugal partition chromatography / Franziska Bezold ; Gutachter: Irina Smirnova, Mirjana Minceva, Harald Klein ; Betreuer: Mirjana Minceva". München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1203299745/34.

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Padmanabhan, Ramalekshmi Thanu Dinesh. "USE OF DILUTE HYDROFLUORIC ACID AND DEEP EUTECTIC SOLVENT SYSTEMS FOR BACK END OF LINE CLEANING IN INTEGRATED CIRCUIT FABRICATION". Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202981.

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Fabrication of current generation integrated circuits involves the creation of multilevel copper/low-k dielectric structures during the back end of line processing. This is done by plasma etching of low-k dielectric layers to form vias and trenches, and this process typically leaves behind polymer-like post etch residues (PER) containing copper oxides, copper fluorides and fluoro carbons, on underlying copper and sidewalls of low-k dielectrics. Effective removal of PER is crucial for achieving good adhesion and low contact resistance in the interconnect structure, and this is accomplished using wet cleaning and rinsing steps. Currently, the removal of PER is carried out using semi-aqueous fluoride based formulations. To reduce the environmental burden and meet the semiconductor industry's environmental health and safety requirements, there is a desire to completely eliminate solvents in the cleaning formulations and explore the use of organic solvent-free formulations.The main objective of this work is to investigate the selective removal of PER over copper and low-k (Coral and Black Diamond®) dielectrics using all-aqueous dilute HF (DHF) solutions and choline chloride (CC) - urea (U) based deep eutectic solvent (DES) system. Initial investigations were performed on plasma oxidized copper films. Copper oxide and copper fluoride based PER films representative of etch products were prepared by ashing g-line and deep UV photoresist films coated on copper in CF4/O2 plasma. PER removal process was characterized using scanning electron microscopy and X-ray photoelectron spectroscopy and verified using electrochemical impedance spectroscopy measurements.A PER removal rate of ~60 Å/min was obtained using a 0.2 vol% HF (pH 2.8). Deaeration of DHF solutions improved the selectivity of PER over Cu mainly due to reduced Cu removal rate. A PER/Cu selectivity of ~20:1 was observed in a 0.05 vol% deaerated HF (pH 3). DES systems containing 2:1 U/CC removed PER at a rate of ~10 and ~20 Å/min at 40 and 70oC respectively. A mixture of 10-90 vol% de-ionized water (W) with 2:1 U/CC in the temperature range of 20 to 40oC also effectively removed PER. Importantly, etch rate of copper and low-k dielectric in DES formulations were lower than that in conventional DHF cleaning solutions.
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Kellat, Libby Nicole. "Model Chemistry Study Of Choline And Urea Based Deep Eutectic Solvents". Cleveland State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=csu1545074963407735.

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Fullarton, Claire. "Working towards a new sustainable rechargeable battery : zinc, conducting polymer and deep eutectic solvent system". Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/31863.

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Electronically conducting polymers based on functionalised thiophenes and pyrroles have continued to stimulate academic interest as well as starting to be employed in practical applications and uses. This thesis describes studies of the electronic properties of mixed thiophene-pyrrole polymers (based on custom synthesised mixed monomer precursors) and polymers electrodeposited from commercially available monomers, pyrrole and 3,4-ethylenedioxythiophene, in respect to energy storage applications including batteries and ion selective membranes. In such applications the movement of ion and solvent through the polymer film during oxidation and reduction cycles is critical to application and function, e.g. charging rate, metal ion permeability or adhesion stability. Recently the unexpected behaviour of polypyrrole in choline chloride based ionic liquids has been described. These liquids are especially attractive because of their unique solubility profiles, high stability, low volatility and low toxicity. This thesis describes the electrochemical characterisation, DC capacitance behaviour and ion/solvent transport properties of conducting polymers using a range of electrochemical methodologies in combination with acoustic impedance electrochemical quartz crystal microbalance techniques (EQCM) and X-Ray Photo-electron Spectroscopy (XPS). The behaviour of several mixed thiophene-pyrrole films, polypyrrole and poly 3,4-ethylenedioxythiophene in different electrolyte media; deep eutectic solvents (DESs), conventional organic solvents and aqueous media are contrasted in this thesis. PEDOT and one of the mixed thiophene-pyrrole polymers (poly 2-(thiophene-2-yl)-1H pyrrole) gave the highest DC capacitances of the polymers investigated, with high values observed in both choline chloride based (Type III) and zinc based (Type IV) DESs. The ion dynamics of the polymers p-doping in the DESs, observed to fit gravimetric data recorded, was able to show a marked difference in the ion transfers between DES types and a conventional organic solvent, acetonitrile. Both polymers in acetonitrile and the zinc based DES (ZnCl2 / EG) satisfied the electro-neutrality condition through dominance of anion transfers. Whereas, polymers in the choline chloride based DES (Ethaline) satisfied the electro-neutrality condition through dominance of choline cation transfers (in the opposite direction to anion transfers). This research involved work towards the development of a new class of rechargeable batteries based on a Zinc-Polymer system incorporating a novel, inexpensive, environmentally sustainable solvent. This work is necessitated by the problems associated with petrol and diesel powered vehicles and the limitations of batteries available for electric vehicles.
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Orejuela, Lourdes Magdalena. "Lignocellulose deconstruction using glyceline and a chelator-mediated Fenton system". Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/81255.

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Non-edible plant biomass (lignocellulose) is a valuable precursor for liquid biofuels, through the processes of pretreatment and saccharification followed by fermentation into products such as ethanol or butanol. However, it is difficult to gain access to the fermentable sugars in lignocellulose, and this problem is principally associated with limited enzyme accessibility. Hence, biomass pretreatments that destroy native cell wall structure and allows enzyme access are required for effective biomass conversion techniques. This research studied two novel pretreatment methods on two wood species: 1) a deep eutectic solvent (DES) that, under heat, swells lignocellulose and partially solubilizes cell wall materials by causing breakage of lignin-carbohydrate linkages and depolymerization of the biomass components, and 2) a chelator-mediated Fenton reaction (CMF) that chemically modifies the nanostructure of the cell wall through a non-enzymatic cell wall deconstruction. After pretreatment, utilizing analytical techniques such as nuclear magnetic spectroscopy, wide angle x-ray scattering, and gel permeation chromatography, samples were analyzed for chemical and structural changes in the solubilized and residual materials. After single stage DES (choline-chloride-glycerol) and two stage, CMF followed by DES pretreatments, lignin/carbohydrate fractions were recovered, leaving a cellulose-rich fraction with reduced lignin and hemicellulose content as determined by compositional analysis. Lignin and heteropolysaccharide removal by DES was quantified and the aromatic-rich solubilized biopolymer fragments were analyzed as water insoluble high molecular weight fractions and water-ethanol soluble low molecular weight compounds. After pretreatment for the hardwood sample, enzyme digestibility reached a saccharification yield of 78% (a 13-fold increase) for the two stage (DES/CMF) pretreated biomass even with the presence of some lignin and xylan remained on the pretreated fiber; only a 9-fold increase was observed after the other sequence of CMF followed by DES treatment. Single stage CMF treatment or single stage DES pretreatment improved 5-fold glucose yield compared to the untreated sample for the hardwood sample. The enhancement of enzymatic saccharification for softwood was less than that of hardwoods with only 4-fold increase for the sequence CMF followed by DES treatment. The other sequence of treatments reached up to 2.5-fold improvement. A similar result was determined for the single stage CMF treatment while the single stage DES treatment reached only 1.4-fold increase compared to the untreated softwood. Hence, all these pretreatments presented different degrees of biopolymer removal from the cell wall and subsequent digestibility levels; synergistic effects were observed for hardwood particularly in the sequence DES followed by CMF treatment while softwoods remained relatively recalcitrant. Overall, these studies revealed insight into two novel methods to enhance lignocellulosic digestibility of biomass adding to the methodology to deconstruct cell walls for fermentable sugars.
Ph. D.
Wood is a valuable material that can be used to produce liquid biofuels. Wood main components are biopolymers cellulose, hemicellulose and lignin that form a complex structure. Nature has locked up cellulose in a protective assembly that needs to be destroyed to gain access to cellulose, convert it to glucose and then ferment it to bioalcohol. This process is principally associated with limited enzyme accessibility. Therefore, biomass pretreatments that deconstruct native cell wall structure and allow enzyme access are required for effective biomass conversion techniques. This research studied two novel pretreatment methods on two wood species: 1) a deep eutectic solvent called glyceline that, under heat, swells wood and partially solubilizes cell wall materials by causing breakage of bonds and converting it into smaller molecules (monomers and oligomers), and 2) a chelator-mediated Fenton system (CMF) that chemically modifies the structure of the cell wall. Pretreatments were tested individually and in sequence in sweetgum and southern yellow pine. After pretreatments, utilizing analytical techniques, fractions were investigated for chemical and structural changes in the solubilized and residual materials. Treated wood samples were exposed to enzymatic conversion. A maximum 78% of glucose yield was obtained for the glyceline followed by CMF pretreated wood. For yellow pine only a 24% of glucose yield was obtained for the CMF followed by glyceline treatment. All these pretreatments presented different degrees of biopolymer removal from the cell wall and subsequent enzyme conversion levels. Overall, these studies revealed insight into two novel methods to enhance wood conversion adding to the methodology to deconstruct cell walls for fermentable sugars.
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Taubert, Jenny. "Use of Formulations Based On Choline Chloride-Malonic Acid Deep Eutectic Solvent for Back End of Line Cleaning in Integrated Circuit Fabrication". Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/283692.

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Interconnection layers fabricated during back end of line processing in semiconductor manufacturing involve dry etching of a low-k material and deposition of copper and metal barriers to create copper/dielectric stacks. After plasma etching steps used to form the trenches and vias in the dielectric, post etch residues (PER) that consist of organic polymer, metal oxides and fluorides, form on top of copper and low-k dielectric sidewalls. Currently, most semiconductor companies use semi aqueous fluoride (SAF) based formulations containing organic solvent(s) for PER removal. Unfortunately, these formulations adversely impact the environmental health and safety (EHS) requirements of the semiconductor industry. Environmentally friendly "green" formulations, free of organic solvents, are preferred as alternatives to remove PER. In this work, a novel low temperature molten salt system, referred as deep eutectic solvent (DES) has been explored as a back end of line cleaning (BEOL) formulation. Specifically, the DES system comprised of two benign chemicals, malonic acid (MA) and choline chloride (CC), is a liquid at room temperature. In certain cases, the formulation was modified by the addition of glacial acetic acid (HAc). Using these formulations, selective removal of three types of PER generated by timed CF₄/O₂ etching of DUV PR films on Cu was achieved. Type I PER was mostly organic in character (fluorocarbon polymer type) and had a measured thickness of 160 nm. Type II PER was much thinner (25 nm) and consisted of a mixture of organic and inorganic compounds (copper fluorides). Further etching generated 17 nm thick Type III PER composed of copper fluorides and oxides. Experiments were also conducted on patterned structures. Cleaning was performed by immersing samples in a temperature controlled (30 or 40° C) double jacketed vessel for a time between 1 and 5 minutes. Effectiveness of cleaning was characterized using SEM, XPS and single frequency impedance measurements. Type II and III residues, which contained copper compounds were removed in CC/MA DES within five minutes through dissolution and subsequent complexation of copper by malonic acid. Removal of Type I PER required the addition of glacial acetic acid to the DES formulation. Single frequency impedance measurement appears to be a good in situ method to follow the removal of the residues. High water solubility of the components of the system in conjunction with their environmental friendly nature, make the DES an attractive alternative to SAF.
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Ojala, J. (Jonna). "Functionalized cellulose nanoparticles in the stabilization of oil-in-water emulsions:bio-based approach to chemical oil spill response". Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526222417.

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Abstract Nanocellulose is a renewable, biodegradable, and easily available material that is considered as an attractive resource for many different value-added applications in the emerging bio-based economy. Its outstanding properties, such as strength, lightness, transparency, and good thermal insulation, have inspired research and product development around nanocellulose. The potential of nanocellulose to replace synthetic chemicals made from non-renewable sources, for example, is considered to be very promising. Chemical functionalization, that is, the modification of the cellulosic surface properties, is seen to be beneficial in applications such as those in which higher hydrophobicity is needed. In this thesis, the ability of cellulose nanoparticles to stabilize oil droplets in oil-in-water emulsions was studied. The aim of the study was to explore the possibility of developing a new type of "green" oil spill chemical from cellulose. Therefore, the cellulose was chemically modified in an aquatic environment with a sequential periodate oxidation and chlorite oxidation followed by reductive amination reaction, which increased the hydrophobicity of the produced nanocellulose. In addition, the use of deep-eutectic solvents in the preparation of modified (succinylated and carboxylated) and non-modified cellulose nanoparticles was studied. Chemical (kraft) pulp, dissolving pulp, and semi-chemical fine fibers were used as raw materials in this research. The results demonstrated that chemically modified cellulose nanoparticles work well as stabilizers for oil-water emulsions resulting in small, stable oil droplets and impeding creaming, which is a typical phenomenon for particle stabilized emulsions. The modification of cellulose nanoparticles improved their ability to partition at the oil-water interface, which enabled efficient and irreversible adsorption. It was found that because of their small size, the cellulose nanocrystals can be compressed more tightly onto the surface of the oil droplet, while longer and more flexible cellulose nanofibrils formed a web structure between the oil droplets. All cellulose nanoparticle-stabilized emulsions were stable against droplet coalescence, and even at low temperatures, they retained their droplet size and stability. Salinity, on the other hand, improved stability when CNCs from chemical pulp were used, but it negatively affected stability when nanocrystals from semichemical pulp were used
Tiivistelmä Uusiutuva, biohajoava ja helposti saatavilla oleva nanoselluloosa on merkittävä tulevaisuuden raaka-aine useissa erilaisissa käyttökohteissa. Sen ylivertaiset ominaisuudet, kuten lujuus, keveys, läpinäkyvyys ja lämmöneristävyys ovat olleet innoittamassa nanoselluloosan tutkimusta ja tuotekehitystä. Nanoselluloosan mahdollisuuksia ja käyttöä eri sovelluksissa korvaamaan esimerkiksi uusiutumattomista luonnonvaroista valmistettuja kemikaaleja, pidetään erittäin lupaavina. Kemiallisesta funktionalisoinnista eli selluloosan pintaominaisuuksien muokkauksesta nähdään olevan hyötyä, kun tavoitellaan nanoselluloosan toiminnallisuutta esimerkiksi hydrofobista luonnetta vaativissa sovelluksissa pinta-aktiivisen aineen tavoin. Tässä työssä tutkittiin erityisesti nanoselluloosapartikkeleiden kykyä stabiloida öljypisaroita dieselöljy-vesiemulsioissa. Tutkimuksen päämääränä oli selvittää mahdollisuutta kehittää uudentyyppistä, ”vihreää” öljyntorjuntakemikaalia selluloosasta. Tämän vuoksi selluloosaa muokattiin kemiallisesti vesiympäristössä yhdistetyllä hapetus- ja aminointikäsittelyllä, mikä lisäsi valmistetun nanoselluloosan hydrofobisuutta. Toisena käsittelyvaihtoehtona tutkittiin syväeutektisten liuottimien käyttöä sekä muokattujen (sukkinyloidut ja karboksyloidut) että muokkaamattomien nanoselluloosapartikkeleiden valmistuksessa. Raaka-aineina työssä käytettiin kemiallista sellumassaa, liukosellua sekä puolikemiallista hienokuitua. Työn tuloksena voidaan todeta, että nanoselluloosasta valmistetut kemiallisesti muokatut (funktionalisoidut) nanopartikkelit toimivat hyvin öljy-vesiemulsiossa estäen emulsion öljypisaroiden yhteensulautumista. Nanopartikkelit stabiloivat emulsiossa olevan öljyn hyvin pieniksi pisaroiksi hidastaen kermottumista eli emulsion yleistä faasierottumista. Nanoselluloosan funktionalisointi paransi sen kykyä hakeutua öljy-vesi rajapintaan, mahdollistaen tehokkaan ja palautumattoman adsorption. Havaittiin, että pienen kokonsa vuoksi selluloosananokiteet pystyivät pakkautumaan tiiviimmin öljyn pinnalle, kun taas selluloosananokuidut, jotka ovat pidempiä, muodostivat verkkomaisen rakenteen myös öljypisaroiden väliin. Suolan lisäys vaikutti emulsion stabiilisuuteen vaihtelevasti eri näytteiden välillä, kun taas kylmät olosuhteet poikkeuksetta paransivat stabiilisuutta
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Dong, Ji-Yao, i 董繼堯. "An Antisolvent Approach to Nanostructure ZnO Using Choline Chloride Based Deep Eutectic Solvent". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/27413680483977606118.

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Streszczenie:
博士
國立清華大學
化學工程學系
99
In this article, we demonstrate a new, facile and green antisolvent process to prepare nanostructure ZnO. The deep eutectic solvent (DES) is a new class green solvent that is negligible vapor pressure, high polar and biocompatible. UCC is one of DES that shows high solubility of many metal oxides that can be used as solvent in this approach. The antisolvent should be miscible with the DES UCC and non-solvent for the solute. By controlling the nucleation and growth, various morphologies of ZnO can be made by this method. At low ZnO concentration in UCC, ZnO twin-cone and rods can be prepared with morphology and size controls by injection rate and the ethanol content in antisolvent. The ethanol in the antisolvent can reduce the growth rate of ZnO and also lower the product dimensions. If the injection rate of ZnO-containing DES was reduced, the supply of Zn source became limited and the crystal growth became 1D dominated and grows on the preferred direction. It turns the product structure from twin-cones to nanorods. Mesocrystal ZnO is a mesoporous material fabricated from nanocrystals (NCs) with ordered orientation superstructure. Thus the material possesses high surface area and good crystallinity as single crystal. We use a biological buffer Tris as an oriented agent in antisolvent. ZnO NCs were made in antisolvent then Tris can increase the concentration of hydroxyl group in antisolvent. The hydroxyl group can attach on the oxygen vacancies on the polar O-terminated surface then increased the polarity of the ZnO NCs and then be attached together with the same orientation to form a mesocrystal ZnO. The increasing amount of Tris can make a larger size, better crystallinity and smaller surface area mesocrystal ZnO. The crystallinity is the more important factor rather than surface area. Thus a mesocrystal ZnO prepared in high Tris concentration shows better photocatalytic reactivity. At high ZnO dissolved concentration and low injection rate, the ZnO-ZCH nanosheet can be made by this antisolvent approach. After the annealing, single crystal mesoporous ZnO nanosheet can be parpared. The sheet is thin with a thickness of 10 nm and many pores with size of 5-60 nm can be found on the nanosheets. The ZnO nanosheet is single crystal and high surface area (~90 m2/g) with the exposed plane of (11-20). It can be used as photocatalyst for degradation of methylene blue (MB) in aqueous solution. The single crystal mesocrystal ZnO nanosheet shows performance as good as TiO2 P25.
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SUPRARUKMI, DIANITA DINI, i 蘇霓娜. "An Optimum Process on the Electrodeposition on Copper Substrate Using Deep Eutectic Solvent Based on Choline Chloride–Glycerol". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/08615400802501499124.

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碩士
國立臺灣科技大學
化學工程系
103
Electrodeposition of metals such as Zn, Co, and Ni has been shown possible in a wide range of ionic liquids. A deep eutectic solvent (DES) is new generation of ionic liquid, which can replace the traditional ionic liquid (IL) and act as both a solvent and an electrolyte. Commonly, DESs based on ChCl–urea and ChCl–ethylene glycol have been used for the deposition process. In this thesis, the study was about searching the ChCl based DESs to be used as suitable electrolyte towards the electrodeposition. The electrochemical characterization of metals to be electrodeposited was carried out using cyclic voltammetry at 70 oC. The results showed that the reaction of metal(II) to metal(0) was irreversible. The diffusion coefficients of metals were in the range of 1–2.5 x 10-7 cm2/s at 70 oC. Initially, 5 different DESs were tested as the electrolyte and the best electrolyte was chosen for the optimization process on the system. Electrodeposition of metals was studied at different cathodic potentials, metal salt concentrations, and working temperatures in order to optimized the plating process. The metal deposits were characterized using scanning electron microscope (SEM), energy disperse X-ray spectroscopy (EDX), and X-ray diffraction (XRD). The results of metal deposits showed that the process proceeds smoothly in DES from ChCl–glycerol at a lower temperature (40 oC). EDS and XRD analysis confirmed that high-purity metallic deposits were obtained.
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Części książek na temat "Deep eutectic solvent-based systems"

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Ramezani, Amir M., Yadollah Yamini i Raheleh Ahmadi. "Deep Eutectic Solvent-Based Microextraction". W Microextraction Techniques in Analytical Toxicology, 221–37. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003128298-14.

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Shahbaz, K., I. M. AlNashef, R. J. T. Lin, M. A. Hashim, F. S. Mjalli i Mohammed Farid. "A Novel Calcium Chloride Hexahydrate-Based Deep Eutectic Solvent as a Phase Change Material". W Thermal Energy Storage with Phase Change Materials, 51–66. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9780367567699-5.

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Chai, Sophie Jing Nee, Xiao-Qian Fu, Dong-Qiang Lin i Pau Loke Show. "Sugar-based deep eutectic solvent-aqueous two-phase system". W Principles of Multiple-Liquid Separation Systems, 63–80. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-91728-5.00016-0.

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Trivedi, Shruti, Shreya Juneja, Vaishali Khokhar i Siddharth Pandey. "Solvation within deep eutectic solvent-based systems: A review". W Green Sustainable Process for Chemical and Environmental Engineering and Science, 145–92. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-95156-2.00013-1.

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Song, Zhen, Teng Zhou, Zhiwen Qi i Kai Sundmacher. "Computer-Aided Screening of Deep Eutectic Solvent Systems for the Associative Extraction of α-Tocopherol from Deodorizer Distillate". W 31st European Symposium on Computer Aided Process Engineering, 341–46. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-323-88506-5.50054-1.

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"Avoid Auxiliaries". W Green Chemistry: Principles and Case Studies, 125–68. The Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/bk9781788017985-00125.

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Auxiliaries are chemicals other than reactants or catalysts required for a reaction or purification. Solvents, extraction chemicals, and chromatography adsorbents are all auxiliaries that should be minimized in greener chemical processes. Solvent characteristics to be considered in choosing a greener solvent are: (1) flammability, (2) toxicity, (3) reactivity, (4) environmental degradability, and (5) energy required for evaporation (boiling point). Auxiliaries should be minimized or eliminated to minimize risk. High-speed ball-milling and twin-screw extraction have been used to eliminate solvents in both inorganic and organic reactions. Solvent-free chemistry is the safest, greenest choice. Eastman eliminated solvents from a process to make cosmetic esters with immobilized enzymes. Greener substitutes for solvents are renewable solvents, water, supercritical CO2, and ionic liquids. Water can be a greener solvent in many cases, though it is energy intensive to evaporate. Supercritical CO2 has been used as a solvent in diverse chemical reactions—hydrogenation of isophorone was described as an example. Astra-Zeneca scaled up chiral separations using scCO2. Ionic liquids based on choline are non-toxic, room temperature liquids that have been used as solvents. The deep eutectic solvent, choline chloride–glycerol, was an excellent solvent for processing biomass.
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Kruber, Kai Fabian, Mariann Kroll, Christoph Held i Mirko Skiborowski. "Evaluation of the potential of a deep eutectic solvent for liquid-liquid extraction of furfural using optimization-based process design". W Computer Aided Chemical Engineering, 955–60. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-443-15274-0.50152-9.

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Streszczenia konferencji na temat "Deep eutectic solvent-based systems"

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Šalić, Anita, Anabela Ljubić i Bruno Zelić. "Development of Aqueous Two-Phase Systems Based on Deep Eutectic Solvents for Continuous Protein Extraction in A Microextractor". W Micromachines 2021 — 1st International Conference on Micromachines and Applications (ICMA2021). Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/micromachines2021-09546.

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Niawanti, Helda, Siti Zullaikah i M. Rachimoellah. "Purification of biodiesel by choline chloride based deep eutectic solvent". W INTERNATIONAL SEMINAR ON FUNDAMENTAL AND APPLICATION OF CHEMICAL ENGINEERING 2016 (ISFAChE 2016): Proceedings of the 3rd International Seminar on Fundamental and Application of Chemical Engineering 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4982280.

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Gojun, Martin, Sara Anđelović, Marko Božinović, Željka Ćurić, Kristina Zagajski Kučan, Anita Šalić i Bruno Zelić. "Purification of biodiesel produced by lipase catalysed transesterification by two-phase systems based on deep eutectic solvents in a microextractor: Selection of solvents and process optimization". W Micromachines 2021 — 1st International Conference on Micromachines and Applications (ICMA2021). Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/micromachines2021-09592.

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Taslim, Leonardo Indra, Renita Manurung, Agus Winarta i Debbie Aditia Ramadhani. "Biodiesel production from ethanolysis of DPO using deep eutectic solvent (DES) based choline chloride – ethylene glycol as co-solvent". W PROCEEDINGS FROM THE 14TH INTERNATIONAL SYMPOSIUM ON THERAPEUTIC ULTRASOUND. Author(s), 2017. http://dx.doi.org/10.1063/1.4978079.

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Othman, Zetty Shafiqa, Nur Hasyareeda Hassan i Saiful Irwan Zubairi. "Alcohol based-deep eutectic solvent (DES) as an alternative green additive to increase rotenone yield". W THE 2015 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2015 Postgraduate Colloquium. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4931283.

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Ovsyannikova, V. S., i A. G. Shcherbakova. "Influence of composition based on deep eutectic solvent on biodestruction of oils of different composition". W PROCEEDINGS OF THE INTERNATIONAL CONFERENCE “PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY”. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0084751.

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Al-Weheibi, I., R. Al-Hajri, Y. Al-Wahaibi, B. Jibril i A. Mohsenzadeh. "Oil Recovery Enhancement in Middle East Heavy Oil Field using Malonic Acid based Deep Eutectic Solvent". W SPE Middle East Oil & Gas Show and Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/172592-ms.

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Manurung, Renita, Ardian Syahputra, Muhammad Arif Alhamdi, Siti Maisarah i Debbie Aditia Ramadhani. "Degummed palm oil methanolysis process using Choline Chloride (ChCl) and glycerol based Deep Eutectic Solvent (DES) as co-solvent at biodiesel production". W 2017 International Conference on Sustainable Energy Engineering and Application (ICSEEA). IEEE, 2017. http://dx.doi.org/10.1109/icseea.2017.8267697.

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Tan, Shiou Xuan, Andri Andriyana, Steven Lim, Hwai Chyuan Ong, Yean Ling Pang i Gek Cheng Ngoh. "Natural Deep Eutectic Solvent (NADES) as Plasticizer for Bioplastic Film Fabrication. A Comparative Study". W International Technical Postgraduate Conference 2022. AIJR Publisher, 2022. http://dx.doi.org/10.21467/proceedings.141.23.

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Incorporation of chitosan into the bioplastic film could improve its mechanical properties. However, aqueous acidic solution is required to dissolve the chitosan. The aim of the present work was to explore the potential use of acidic NADES as the plasticizer as well as a solvent for chitosan without the addition of aqueous acidic solution. The film-forming solution consisted of sago starch as the matrix and chitosan as the filler was prepared by solution casting and evaporation method in the presence of acidic NADES. Acidic NADES was obtained by mixing choline chloride (ChCl) and lactic acid (LA) as the hydrogen bond acceptor and hydrogen bond donor, respectively. The mechanical properties and water uptake ability of chitosan-reinforced starch-based bioplastic films plasticized with acidic NADES were compared with the bioplastic films plasticized with conventional plasticizer, glycerol in the absence and presence of acetic acid solution. The results revealed that acidic NADES was capable of plasticizing the starch and dissolve the chitosan. Bioplastic film plasticized with acidic NADES achieved higher tensile strength and lower water uptake than the bioplastic film plasticized with glycerol in the presence of acetic acid solution. The interaction between chitosan and acidic NADES was confirmed by Fourier-transform infrared spectroscopy (FTIR). FTIR results exhibited that the amide II band of chitosan in the ChCl/LA film had shifted, and its intensity had decreased to almost undetectable.
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Krisanti, Elsa Anisa, Kelvin Saputra, Muhammad Maula Arif i Kamarza Mulia. "Formulation and characterization of betaine-based deep eutectic solvent for extraction phenolic compound from spent coffee grounds". W PROCEEDINGS OF THE 5TH INTERNATIONAL SYMPOSIUM ON APPLIED CHEMISTRY 2019. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5134604.

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