The effect of isopropyl alcohol and non-ionic surfactant mixtures on the wetting of porous coated paper

C.-M. Tåg (Corresponding Author), Maunu Toiviainen, Mikko Juuti, J.B. Rosenholm, K. Backfolk, P.A.C. Gane

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

The influence of isopropyl alcohol and non-ionic surfactant solutions on aqueous droplet wetting behaviour on porous coated paper was determined. Paper coatings provide a micro- and nano-porous surface structure, which strictly speaking cannot be described in simple roughness terms as sub-surface lateral absorption directly impacts on the apparent contact angle. It is this very deviation from an idealised system that leads to novel wetting phenomena. Isopropyl alcohol and surfactant-based systems, both of which are commonly used in the printing industry, show differences in wetting behaviour, on both short and long timescales, with changes in the relative composition of the mixtures. Small variations of 0.1 wt% in surfactant concentration have a dramatic influence on the dynamic surface tension, and thus the wetting. It was observed that the wetting kinetics for isopropyl alcohol and surfactant solutions were different in terms of both wetting area and the penetration rate, even in cases where the dynamic surface tension of the solutions was kept the same. Different stages in the wetting and following drying processes could be observed with near infrared spectral imaging. In addition, the surfactant chemistries such as their degrees of hydrophilicity and molecular weights generated comparative differences in the wetting kinetics. The dominating factor affecting the wetting was, as expected, the solid–liquid interfacial energy defined on the practical porous substrate, which differed from the direct comparison with dynamic surface tension, thus exemplifying the deviation from idealised surface roughness behaviour when considering porous materials. An apparent “equivalent” surface roughness value for the porous material was determined, and it was seen that an increase in this equivalent parameter enhanced the rate of wetting behaviour with decreasing solution surface tension, and so also affected the wetting evolution. The wetting was enhanced by cavities in the coating layer, which were enlarged by the penetrating liquids.
Original languageEnglish
Pages (from-to)225-242
Number of pages18
JournalTransport in Porous Media
Volume94
Issue number1
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

2-Propanol
Nonionic surfactants
Wetting
Alcohols
Surface-Active Agents
Surface tension
Surface active agents
Surface roughness
Porous materials
Kinetics
Coating techniques
Hydrophilicity
Interfacial energy
Surface structure
Contact angle
Printing
Drying
Molecular weight

Keywords

  • Fountain solution
  • imbibition
  • offset printing
  • porous media
  • spreading
  • wetting

Cite this

Tåg, C-M., Toiviainen, M., Juuti, M., Rosenholm, J. B., Backfolk, K., & Gane, P. A. C. (2012). The effect of isopropyl alcohol and non-ionic surfactant mixtures on the wetting of porous coated paper. Transport in Porous Media, 94(1), 225-242. https://doi.org/10.1007/s11242-012-0001-5
Tåg, C.-M. ; Toiviainen, Maunu ; Juuti, Mikko ; Rosenholm, J.B. ; Backfolk, K. ; Gane, P.A.C. / The effect of isopropyl alcohol and non-ionic surfactant mixtures on the wetting of porous coated paper. In: Transport in Porous Media. 2012 ; Vol. 94, No. 1. pp. 225-242.
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abstract = "The influence of isopropyl alcohol and non-ionic surfactant solutions on aqueous droplet wetting behaviour on porous coated paper was determined. Paper coatings provide a micro- and nano-porous surface structure, which strictly speaking cannot be described in simple roughness terms as sub-surface lateral absorption directly impacts on the apparent contact angle. It is this very deviation from an idealised system that leads to novel wetting phenomena. Isopropyl alcohol and surfactant-based systems, both of which are commonly used in the printing industry, show differences in wetting behaviour, on both short and long timescales, with changes in the relative composition of the mixtures. Small variations of 0.1 wt{\%} in surfactant concentration have a dramatic influence on the dynamic surface tension, and thus the wetting. It was observed that the wetting kinetics for isopropyl alcohol and surfactant solutions were different in terms of both wetting area and the penetration rate, even in cases where the dynamic surface tension of the solutions was kept the same. Different stages in the wetting and following drying processes could be observed with near infrared spectral imaging. In addition, the surfactant chemistries such as their degrees of hydrophilicity and molecular weights generated comparative differences in the wetting kinetics. The dominating factor affecting the wetting was, as expected, the solid–liquid interfacial energy defined on the practical porous substrate, which differed from the direct comparison with dynamic surface tension, thus exemplifying the deviation from idealised surface roughness behaviour when considering porous materials. An apparent “equivalent” surface roughness value for the porous material was determined, and it was seen that an increase in this equivalent parameter enhanced the rate of wetting behaviour with decreasing solution surface tension, and so also affected the wetting evolution. The wetting was enhanced by cavities in the coating layer, which were enlarged by the penetrating liquids.",
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Tåg, C-M, Toiviainen, M, Juuti, M, Rosenholm, JB, Backfolk, K & Gane, PAC 2012, 'The effect of isopropyl alcohol and non-ionic surfactant mixtures on the wetting of porous coated paper', Transport in Porous Media, vol. 94, no. 1, pp. 225-242. https://doi.org/10.1007/s11242-012-0001-5

The effect of isopropyl alcohol and non-ionic surfactant mixtures on the wetting of porous coated paper. / Tåg, C.-M. (Corresponding Author); Toiviainen, Maunu; Juuti, Mikko; Rosenholm, J.B.; Backfolk, K.; Gane, P.A.C.

In: Transport in Porous Media, Vol. 94, No. 1, 2012, p. 225-242.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The effect of isopropyl alcohol and non-ionic surfactant mixtures on the wetting of porous coated paper

AU - Tåg, C.-M.

AU - Toiviainen, Maunu

AU - Juuti, Mikko

AU - Rosenholm, J.B.

AU - Backfolk, K.

AU - Gane, P.A.C.

PY - 2012

Y1 - 2012

N2 - The influence of isopropyl alcohol and non-ionic surfactant solutions on aqueous droplet wetting behaviour on porous coated paper was determined. Paper coatings provide a micro- and nano-porous surface structure, which strictly speaking cannot be described in simple roughness terms as sub-surface lateral absorption directly impacts on the apparent contact angle. It is this very deviation from an idealised system that leads to novel wetting phenomena. Isopropyl alcohol and surfactant-based systems, both of which are commonly used in the printing industry, show differences in wetting behaviour, on both short and long timescales, with changes in the relative composition of the mixtures. Small variations of 0.1 wt% in surfactant concentration have a dramatic influence on the dynamic surface tension, and thus the wetting. It was observed that the wetting kinetics for isopropyl alcohol and surfactant solutions were different in terms of both wetting area and the penetration rate, even in cases where the dynamic surface tension of the solutions was kept the same. Different stages in the wetting and following drying processes could be observed with near infrared spectral imaging. In addition, the surfactant chemistries such as their degrees of hydrophilicity and molecular weights generated comparative differences in the wetting kinetics. The dominating factor affecting the wetting was, as expected, the solid–liquid interfacial energy defined on the practical porous substrate, which differed from the direct comparison with dynamic surface tension, thus exemplifying the deviation from idealised surface roughness behaviour when considering porous materials. An apparent “equivalent” surface roughness value for the porous material was determined, and it was seen that an increase in this equivalent parameter enhanced the rate of wetting behaviour with decreasing solution surface tension, and so also affected the wetting evolution. The wetting was enhanced by cavities in the coating layer, which were enlarged by the penetrating liquids.

AB - The influence of isopropyl alcohol and non-ionic surfactant solutions on aqueous droplet wetting behaviour on porous coated paper was determined. Paper coatings provide a micro- and nano-porous surface structure, which strictly speaking cannot be described in simple roughness terms as sub-surface lateral absorption directly impacts on the apparent contact angle. It is this very deviation from an idealised system that leads to novel wetting phenomena. Isopropyl alcohol and surfactant-based systems, both of which are commonly used in the printing industry, show differences in wetting behaviour, on both short and long timescales, with changes in the relative composition of the mixtures. Small variations of 0.1 wt% in surfactant concentration have a dramatic influence on the dynamic surface tension, and thus the wetting. It was observed that the wetting kinetics for isopropyl alcohol and surfactant solutions were different in terms of both wetting area and the penetration rate, even in cases where the dynamic surface tension of the solutions was kept the same. Different stages in the wetting and following drying processes could be observed with near infrared spectral imaging. In addition, the surfactant chemistries such as their degrees of hydrophilicity and molecular weights generated comparative differences in the wetting kinetics. The dominating factor affecting the wetting was, as expected, the solid–liquid interfacial energy defined on the practical porous substrate, which differed from the direct comparison with dynamic surface tension, thus exemplifying the deviation from idealised surface roughness behaviour when considering porous materials. An apparent “equivalent” surface roughness value for the porous material was determined, and it was seen that an increase in this equivalent parameter enhanced the rate of wetting behaviour with decreasing solution surface tension, and so also affected the wetting evolution. The wetting was enhanced by cavities in the coating layer, which were enlarged by the penetrating liquids.

KW - Fountain solution

KW - imbibition

KW - offset printing

KW - porous media

KW - spreading

KW - wetting

U2 - 10.1007/s11242-012-0001-5

DO - 10.1007/s11242-012-0001-5

M3 - Article

VL - 94

SP - 225

EP - 242

JO - Transport in Porous Media

JF - Transport in Porous Media

SN - 0169-3913

IS - 1

ER -