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Infiltration and dimensional scaling of inkjet droplets on thick isotropic porous materials
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. SP Technical Research Institute of Sweden, Sweden.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science. SP Technical Research Institute of Sweden, Sweden.
2014 (English)In: Microfluidics and Nanofluidics, ISSN 1613-4982, E-ISSN 1613-4990, Vol. 17, no 2, 413-422 p.Article in journal (Refereed) Published
Abstract [en]

We study the imbibition of picoliter (pL)-sized inkjet droplets on controlled pore glass membranes (CPG), as a suitable model for isotropic three-dimensional porous materials. We do so using a variety of liquids, i.e., water, formamide and diiodomethane, and measure the evolution of the imbibition process using high-speed digital imaging. Here, experiments were conducted on 2-280 nm CPG membranes with drops with initial volumes ranging from 100 to 600 pL. We derive scaling laws for imbibition through dimensional analysis and advance the argument that the rate of absorption is related to two-dimensionless groups where v(t) is the imbibed volume, as determined from experiments, t is the time, v (tot) the total liquid volume, the porosity, mu the liquid viscosity, k the permeability, and p (c) the Laplace capillary pressure. We show this scaling to well describe the system at intermediate T values and report that V alpha T-0.8.

Place, publisher, year, edition, pages
2014. Vol. 17, no 2, 413-422 p.
Keyword [en]
Imbibition, Capillarity, Scaling, Inertia, Isotropic porous material, Inkjet
National Category
Natural Sciences Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-152862DOI: 10.1007/s10404-013-1313-7ISI: 000339886000015Scopus ID: 2-s2.0-84904822647OAI: oai:DiVA.org:kth-152862DiVA: diva2:751924
Note

QC 20141002

Available from: 2014-10-02 Created: 2014-10-02 Last updated: 2017-12-05Bibliographically 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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