Influence of cellulose gel matrix on BMIMCl ionic liquid dynamics and conductivity

Kaszyńska, J.; Rachocki, Adam; Bielejewski, Michał; Tritt‐Goc, Jadwiga

doi:10.1007/s10570-017-1223-z

Cited by 41 publications

(73 citation statements)

References 41 publications

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“…The XRD patterns of the CNC and the all-cellulose composites are shown in Figure 7. The diffraction peaks at 14.9, 16.2, 20.5, 22.4, and 34.3° 2θ were the characteristic of cellulose I, 10,36 and those at 12.4, 20.4, and 34.2° 2θ were the characteristic of cellulose II. 37,38 In the XRD patterns of the CNC, peaks at 14.9, 16.2, 20.5, 22.4, and 34.3° 2θ were observed.…”

Section: Resultsmentioning

confidence: 94%

Solvent Regulation Approach for Preparing Cellulose-Nanocrystal-Reinforced Regenerated Cellulose Fibers and Their Properties

et al. 2019

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An electrolyte and aprotic solvent mixture were used to prepare cellulose solutions containing cellulose nanocrystals (CNCs). All-cellulose composite fibers were then produced by dry–wet spinning these solutions. The presence of CNC in the all-cellulose fibers was demonstrated, and the effects of the CNC on the fiber properties were investigated. The all-cellulose fibers were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and electronic tensile measurements. These results showed that CNCs were present in the mixture and that their structure was maintained in the all-cellulose fibers. No compatibility problems between the CNC and cellulose II matrix were observed. Introducing CNC enhanced the crystallinity, thermal stability, and mechanical properties of the composite fibers.

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Section: Resultsmentioning

confidence: 94%

Solvent Regulation Approach for Preparing Cellulose-Nanocrystal-Reinforced Regenerated Cellulose Fibers and Their Properties

et al. 2019

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“…In Neves et al and Martins et al, three different ILs are studied, among them Bmim BF 4 , and the difference in 1 H relaxation compared with water is reported; they could successfully fit the dispersions by a combination of rotational and translational fast motions and RMTD with an equal weighting of wave numbers. A similar approach has been used for another IL, Bmim Cl, in a cellulose gel matrix . The study that is possibly most similar to this work is the investigation of Bmim octyl sulfate in silica pores by Kruk et al where a comparison with bulk data is interpreted as a second, much slowed‐down translational component of molecules close to the pore wall.…”

Section: Introductionmentioning

confidence: 81%

“…In the case of liquids that possess a pronounced T 1 dispersion already in the bulk, such as for IL at low temperatures, the situation is less obvious. In Neves et al, Martins et al, and Kaszynska et al, the total relaxation rate was considered as a sum of relaxation rates based on a bulk‐like component and an RMTD component; in Kruk et al, the same was done for two standard rotational and translational components for very small (2.7‐nm) pores. The choice between the two general approaches will depend on knowledge of the interaction and the orientation of the studied IL molecules close to the surface.…”

Section: Discussionmentioning

confidence: 99%

Nuclear magnetic relaxation and diffusion study of the ionic liquids 1‐ethyl‐ and 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide confined in porous glass

Seyedlar

Stapf

Mattea

2019

Magnetic Reson in Chemistry

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The molecular dynamics of the room-temperature ionic liquid 1-butyl-3methylimidazolium bis(trifluoromethylsulfonyl)imide (Bmim Tf2N) confined in porous glass is studied by nuclear magnetic resonance (NMR) relaxometry and diffusometry and is compared with the bulk dynamics over a wide temperature range. The molecular reorientation processes for anions and cations alike are found to be significantly affected by the presence of the glass interface at high temperatures. In this respect, the ionic liquid behaves similarly to polar liquids where proton NMR relaxation is governed by reorientations mediated by translational displacements (RMTDs). This process becomes less significant towards lower temperatures when the characteristic translational correlation times of the ions approach a timescale comparable with those of the RMTD process, and the relaxation dispersions in bulk and in confinement become similar below a temperature corresponding to about 1.2T g , a value where the onset of dynamic heterogeneity has been observed before. The self-diffusion coefficient, on the other hand, is found to be strongly reduced than the bulk within the accessible temperature range of 248 K and above and is significantly slower than expected from the tortuosity effect, suggesting that ion-surface interactions affect the macroscopic properties.

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“…Figure 4a shows that the pulp treated with IL [bmim][Cl] forms a very stable viscous and transparent hydrogel. This behavior has been widely explored and attributed to the dependency of cellulose molar mass on the viscosity of the resulting mixtures with [bmim][Cl] [50], and the effect has been taken into account for the cellulose-ILs ion gel and hydrogel membranes synthesis [51,52,53]. We will discuss further that this behavior is not only due to the nature of cellulosic fibers, but also to the primary molecular interactions of the IL with water molecules that might be present in the mixture.…”

Section: Resultsmentioning

confidence: 99%

Dissolution and Hydrolysis of Bleached Kraft Pulp Using Ionic Liquids

et al. 2019

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Forestry industries in Chile are facing an important challenge—diversifying their products using green technologies. In this study, the potential use of Ionic Liquids (ILs) to dissolve and hydrolyze eucalyptus wood (mix of Eucalyptus nitens and Eucalyptus globulus) kraft pulp was studied. The Bleached Hardwood Kraft Pulp (BHKP) from a Chilean pulp mill was used together with five different ILs: 1-butyl-3-methylimidazolium chloride [bmim][Cl], 1-butyl-3-methylimidazolium acetate [bmim][Ac], 1-butyl-3-methylimidazolium hydrogen sulfate [bmim][HSO4], 1-ethyl-3-methylimidazolium chloride [emim][Cl], 1-ethyl-3-methylimidazolium acetate [emim][Ac]. Experimentally, one vacuum reactor was designed to study the dissolution/hydrolysis process for each ILs; particularly, the cellulose dissolution process using [bmim][Cl] was studied proposing one molecular dynamic model. Experimental characterization using Atomic Force Microscopy, conductometric titration, among other techniques suggest that all ILs are capable of cellulose dissolution at different levels; in some cases, the dissolution evolved to partial hydrolysis appearing cellulose nanocrystals (CNC) in the form of spherical aggregates with a diameter of 40–120 nm. Molecular dynamics simulations showed that the [bmim][Cl] anions tend to interact actively with cellulose sites and water molecules in the dissolution process. The results showed the potential of some ILs to dissolve/hydrolyze the cellulose from Chilean Eucalyptus, maintaining reactive forms.

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Influence of cellulose gel matrix on BMIMCl ionic liquid dynamics and conductivity

Cited by 41 publications

References 41 publications

Solvent Regulation Approach for Preparing Cellulose-Nanocrystal-Reinforced Regenerated Cellulose Fibers and Their Properties

Solvent Regulation Approach for Preparing Cellulose-Nanocrystal-Reinforced Regenerated Cellulose Fibers and Their Properties

Nuclear magnetic relaxation and diffusion study of the ionic liquids 1‐ethyl‐ and 1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide confined in porous glass

Dissolution and Hydrolysis of Bleached Kraft Pulp Using Ionic Liquids

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