Liquid uptake in porous cellulose sheets studied with UFI-NMR: Penetration, swelling and air displacement

Nicasy, R.J.K.; Waldner, C.; Erich, S.J.F.; Adan, O.C.G.; Hirn, U.; Huinink, H.P.

doi:10.1016/j.carbpol.2023.121615

Carbohydrate Polymers

2024

DOI: 10.1016/j.carbpol.2023.121615

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Liquid uptake in porous cellulose sheets studied with UFI-NMR: Penetration, swelling and air displacement

R.J.K. Nicasy,

C. Waldner,

S.J.F. Erich

et al.

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2024

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Cited by 3 publications

References 49 publications

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Liquid penetration in hydrophobised cellulose based sheets

Nicasy,

Waldner,

Erich

et al. 2024

Cellulose

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Controlling the liquid transport within cellulose-based materials is crucial for numerous applications, including printing, bio-assays, packaging, and cleaning. To control liquid transport and quality, post-processes such as calendering, a way of compressing and smoothen the paper using hard pressure rollers, and hydrophobisation, are commonly employed. To understand how these processes influence liquid uptake, this study uses an Ultra-Fast Imaging (UFI) NMR method to analyse moisture profiles during liquid uptake in various cellulose-based paper sheets with diverse levels of hydrophobisation and calendering. It is demonstrated that calendering decreases penetration speed and increases swelling. The reduction in penetration speed could be linked to a decrease in permeability upon calendering, as measured by the Gurley air permeance. Additionally, it is observed that hydrophobisation delayed and slowed down liquid uptake in the paper samples, and, in extreme cases, completely altered the liquid uptake phenomena. With substantial hydrophobisation, liquid penetration no longer proceeded with a well-defined liquid front but exhibited huge levels of fingering. Furthermore, is was observed that within highly hydrophobised paper, fibres were first prewetted, initiating a first swelling, before the pores between fibres could be filled. Subsequently, water could enter the pores between, allowing fibre bonds to be broken, leading to a second swelling of the paper sheet. The improved understanding will contribute to better control of the flow within cellulose-based materials, benefiting applications such as printing, packaging and microfluidics.

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Liquid penetration in hydrophobised cellulose based sheets

Nicasy,

Waldner,

Erich

et al. 2024

Cellulose

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Magnetite-latex nanoparticle motion during capillary uptake in thin, porous layers studied with UFI‐NMR

Nicasy,

Barquero,

Huinink

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Pore-Fiber Transport Dynamics of Aqueous Cosolvent Solutions in Paper

Karimnejad,

Gonnet,

Wang

et al. 2024

Langmuir

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After inkjet printing onto uncoated and unsized paper, the ink is first imbibed into the interfiber pores and subsequently absorbed by the cellulose fibers. The achievable print quality depends on the rate of this pore-fiber transport. The latter is accompanied by mechanical expansion of the fibers and the paper sheet. Therefore, we systematically monitored the swelling dynamics of several paper types as a function of ink composition by means of four different measurement techniques. Using aqueous cosolvent solutions as model inks, we found an approximately exponential relation of the time scales of pore-fiber transport with the cosolvent concentration and an approximately linear relation with its molecular weight. Addition of surfactants can substantially speed-up pore-fiber transport.

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Liquid uptake in porous cellulose sheets studied with UFI-NMR: Penetration, swelling and air displacement

Cited by 3 publications

References 49 publications

Liquid penetration in hydrophobised cellulose based sheets

Liquid penetration in hydrophobised cellulose based sheets

Magnetite-latex nanoparticle motion during capillary uptake in thin, porous layers studied with UFI‐NMR

Pore-Fiber Transport Dynamics of Aqueous Cosolvent Solutions in Paper

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