In operando monitoring of wood transformation during pretreatment with ionic liquids

Viell, Jörn; Szekély, Noemi; Mangiapia, Gaetano; Hövelmann, Claas H.; Marks, Caroline; Frielinghaus, Henrich

doi:10.1007/s10570-020-03119-4

Cited by 10 publications

(2 citation statements)

References 63 publications

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“…Furthermore, extraction of cellulose out of industrial paper mill wastewater (Glińska et al 2019) and hemicellulose from a kraft paper pulp (Roselli 2017) using an IL is reported. Viell et al (2020) gave insights into the transformation process in wood treatment with ILs, while Spörl et al (2018) demonstrated a fully recyclable all-cellulose composite, using 1-ethyl-3-methylimidazolium acetate.…”

Section: Ionic Liquids In Combination With Pulp and Papermentioning

confidence: 99%

Mechanical properties of paper saturated with a hydrophobic ionic liquid

Helbrecht

Schmitt

Meckel

et al. 2023

BioRes

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Research into paper-based devices and ionic liquids has increased considerably in the past few years. Thus, the combination of paper-based devices with ionic liquids is also becoming an increasingly frequent research subject. However, the influence of the ionic liquid on the paper properties has been hardly considered. In this paper, the influence of a hydrophobic ionic liquid (1-butyl-3-methylimidazolium bis(trifluoromethyl-sulfonyl)imide) on the mechanical properties of laboratory paper, isotropic and oriented, made from eucalyptus sulfate and cotton linters, is investigated. The tensile strength, elastic modulus, and breaking strain of papers saturated with ionic liquid were about 60 to 90% of the dry paper characteristics. In contrast to water, the breaking strain did not increase in the presence of the ionic liquid. This is because the ionic liquid only slightly swelled the fibers.

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Section: Ionic Liquids In Combination With Pulp and Papermentioning

confidence: 99%

Mechanical properties of paper saturated with a hydrophobic ionic liquid

Helbrecht

Schmitt

Meckel

et al. 2023

BioRes

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“…Acetic acid was purchased from Armar chemicals (Döttingen, CH). Details on the synthesis can be found in Viell et al [27]. For the XRD measurements, hydrogenous EmimAc (Sigma Aldrich, lot no.…”

Section: Sample Preparationmentioning

confidence: 99%

Ionic Liquid (EmimAc)-Water Mixture Confined in Nanoporous Glass Matrices Studied With High-Resolution Neutron Spectroscopy

et al. 2022

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We report on the structure and diffusion behaviour of the various constituent molecules in ionic liquid (IL) mixtures under confinement in nanoporous glasses. X-Ray diffraction measurements indicate that the ions adopt a lamellar arrangement under confinement. Furthermore, using selective deuteration in combination with high resolution neutron spectroscopy reveals how the dynamics and the activation energy of the IL is affected by different confinement conditions (pore sizes 50 Å and 135 Å) and different temperatures (265 and 318 K). With different deuteration schemes we could separate the different motions of acetate and water. The confinement leads to distortions of the domains, which gives more room for diffusion. In the smaller pores, the stronger distortion gives even more room such that the hydrogen bonds between acetate and water seem to be even stronger than in bulk and weaker confinement. The results are discussed in the context of previous measurements on dry samples.

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Impact of hemicelluloses and crystal size on X-ray scattering from atomistic models of cellulose microfibrils

2023

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X-ray scattering methods allow efficient characterization of cellulosic materials, but interpreting their results is challenging. By creating molecular dynamics models of cellulose microfibrils and calculating the scattering from them, we investigated how different properties of the structures affect their scattering intensities. We studied the effects of hemicelluloses and crystal size on small-angle and wide-angle X-ray scattering (SAXS, WAXS). Microfibril models with and without surface-bound hemicelluloses were built based on the chemical composition of spruce secondary cell walls. The effect of fibril size was investigated by comparing the scattering from fibrils with 14 to 40 cellulose chains. The hemicelluloses appeared in the SAXS region as an increase in the fibril radius and as a clear contribution of a shell around the fibril. The hemicelluloses also increased the crystal size as determined from the broadening of the 200 diffraction peak of cellulose $$\textrm{I}_\upbeta$$ I β . The SAXS and WAXS analysis provided consistent estimates for the size of the microfibrils, and their special features and challenges were discussed. In particular, the results of 18-chain microfibrils were consistent with prior experimental results. Carrying out the simulations in wet and dry environments had the most pronounced effect on fibrils with a hemicellulose coating. Twisting of the fibril had very little impact on most properties, except for a minor effect on the WAXS peaks. The results allow for more correct interpretation of experimental scattering results, leading to more accurate descriptions of microfibril structures in natural and processed cellulosic materials.

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In operando monitoring of wood transformation during pretreatment with ionic liquids

Cited by 10 publications

References 63 publications

Mechanical properties of paper saturated with a hydrophobic ionic liquid

Mechanical properties of paper saturated with a hydrophobic ionic liquid

Ionic Liquid (EmimAc)-Water Mixture Confined in Nanoporous Glass Matrices Studied With High-Resolution Neutron Spectroscopy

Impact of hemicelluloses and crystal size on X-ray scattering from atomistic models of cellulose microfibrils

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