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Imbibition and Evaporation of Water Droplets on Paper and Solid Substrates
YKI, Inst Surface Chem, Ytkemiska Inst AB.
YKI, Inst Surface Chem, Ytkemiska Inst AB.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface Chemistry.
2011 (English)In: Journal of Imaging Science and Technology, ISSN 1062-3701, E-ISSN 1943-3522, Vol. 55, no 1, 010201- p.Article in journal (Refereed) Published
Abstract [en]

Imbibition and evaporation of picoliter (pL) sized water droplets on paper media commonly used for inkjet printing is measured using high speed imaging system. Three types of uncoated and coated paper samples were chosen: multipurpose uncoated paper (80 g/m(2)), matte coated paper (230 g/m2), and gloss coated paper (240 g/m(2)). As a reference, the rate of the evaporation process was quantified by using three impermeable solid substrates with different wetting characteristics, i.e., silicon, glass, and hydrophobized glass. It is shown that for water droplets of about 60 pL, imbibition is the dominant phenomenon on the matte and gloss coated paper leading to a total drying time (imbibition plus evaporation) of 10-15 ms for gloss coated paper and 30-150 ms on the matte coated paper. In the latter sample, different regimes in the imbibition process were correlated with the layered structure of the sample. The drying process on the multipurpose paper is dominated by evaporation, with initial drying rate of 0.4-0.6 pL/ms.

Place, publisher, year, edition, pages
2011. Vol. 55, no 1, 010201- p.
Keyword [en]
CAPILLARY RISE, POROUS-MEDIA, PENETRATION, ABSORPTION, KINETICS
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-31330DOI: 10.2352/J.ImagingSci.Technol.2011.55.1.010201ISI: 000287563500002Scopus ID: 2-s2.0-84857859785OAI: oai:DiVA.org:kth-31330DiVA: diva2:404676
Funder
Knut and Alice Wallenberg Foundation
Note
QC 20110318Available from: 2011-03-18 Created: 2011-03-14 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Spontaneous imbibition and colloidal aspects of inkjet printing
Open this publication in new window or tab >>Spontaneous imbibition and colloidal aspects of inkjet printing
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Water-based inkjet is one of the most abundant and versatile digital printing technologies. The subject of this thesis work is processes that take place once an inkjet drop lands on the surface of a porous printing media, with focus on liquid penetration due to capillary action (spontaneous imbibition) and aggregation of ink components. Knowing the details of these two sub-processes would allow optimization of printing processes as well as prediction of the final print result, based on material properties.

The dynamics of drops as they land on different surfaces is captured at adequate time and length-scales by an optical imaging system coupled to an inkjet dispensing unit. The evaporation rate of drops is quantified and distinguished from imbibition, and their spreading behavior on porous substrates is characterized. A set of paper grades is used as examples to conclude that the events are captured accurately. Scaling laws for imbibition are derived from Darcy’s law for liquid flow through dimensional analysis and it is shown that the imbibition rate of drops is related to dimensionless volume and time groups, defined by the volume of the drop, porosity and permeability of the substrate, viscosity of the liquid and the Laplace capillary pressure that drives the imbibition. The approach is applied for two types of systems, one that includes simple liquids imbibing homogeneous and isotropic porous glass and the other that includes complex liquids imbibing heterogeneous and anisotropic paper.

The addition of simple divalent salts to the paper surface is widely used to increase the print quality of water-based pigmented inkjet inks. Salt ions quickly diffuse into the inkjet droplets as they land on the paper and cause the ink to aggregate. This effect leads to the accumulation of colorant-pigments close to, or even on, the surface of the paper. Two salts, CaCl2 and MgCl2, are used to aggregate inkjet inks and their components. The interactions between the aggregated compounds are investigated by a set of experimental measurements that include sedimentation, confocal Raman microscopy, turbidity, rheology and electrophoretic mobility. It is concluded that the salt induced aggregation is led by a non-color polymeric ink component used as a pigment dispersant, and that CaCl2 induces stronger interactions between polymeric carboxylate groups compared to MgCl2. This ion specific effect cannot be explained by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory for electrostatic interaction in colloidal systems.

Place, publisher, year, edition, pages
Stockholm,Sweden: KTH Royal Institute of Technology, 2014. xx, 69 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:39
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-152904 (URN)978-91-7595-272-7 (ISBN)
Public defence
2014-10-24, Q2, Osquldas Väg 10, KTH, Stockholm, 11:56 (English)
Opponent
Supervisors
Note

QC 20141002

Available from: 2014-10-02 Created: 2014-10-02 Last updated: 2014-10-02Bibliographically approved

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