Dye deposition patterns obtained in line printing on macroporous membranes: Improvement of line sharpness by liquid redistribution

Wang, Jun; Thom, Volkmar; Hollas, Markus; Johannsmann, Diethelm

doi:10.1016/j.memsci.2008.02.060

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…1,4 Finally, note that the implicit assumption, that draining driven coffee staining also requires the surface porosity to filter the nanoparticles, may not be a necessary requirement. Wang et al reported on the adsorption of protein solutions printed as continuous lines on a porous membrane, 31 finding that protein segregated toward the edge of the lines after drying. However, their analysis found a number of distinct differences between their observed segregation and that expected from conventional coffee staining.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Formation of Coffee Stains on Porous Surfaces

Dou

Derby

2012

Langmuir

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During the drying of drops of nanoparticle suspensions, segregation can occur by internal fluid flows toward the contact line, if the contact line is pinned. This leads to a characteristic ring deposit or coffee stain. On solid substrates coffee staining can be eliminated through the use of solvent mixtures that promote Marangoni flows to oppose these drying-induced flows. Here it is shown that a suspension, optimized to eliminate the formation of coffee stains on a range of solid surfaces, shows coffee staining on a number of porous surfaces. This behavior is shown to be consistent with a mechanism of fluid removal through capillary flow (draining) of the solvent into the porous substrate, combined with filtration of the particles by the small pore size, in addition to the flow from solvent evaporation. The extent of capillary driven coffee staining is a function of substrate pore size: if the pore size is small, capillary flow is slow, reducing the observed coffee staining. However, if the pore size is too large, the nanoparticles are absorbed into the material along with the draining solute and no deposition of particles is observed.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Formation of Coffee Stains on Porous Surfaces

Dou

Derby

2012

Langmuir

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“…The reduction in the print density was also attributed to higher porosity value as confirmed by the air permeability test (Figure 6). Sheets with porous structure and absorbent fibers consume more inks and take more pigment particles, giving lower print density as previously reported [28][29][30]. The area of contact between an ink droplet and the substrate surface gets expanded parallel to the ink spreading, which is defined as tone value.…”

Section: Printing Propertiesmentioning

confidence: 86%

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

Karademir¹,

Yenidoğan

Aydemir

et al. 2012

International Journal of Polymeric Materials

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A number of thin biocomposites were produced from waste corrugated board pulp with 15% and 30% blending of wool fibers (WF), ceramic fibers (CF), and cotton dust (CD), respectively. The highest sound absorption value was obtained from samples containing 30% wool fibers. Printability of control sheets unfortunately was remarkably damaged. Ceramic fibers improved the thermal stability of control sheets, which was followed by WF and CD. Tensile and burst indexes of samples, however, were greatly reduced. It was furthermore found that CD, CF, and WF additions increased the air permeability values of resultant papers parallel to great reduction on densities.

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“…There is also evidence in the literature for a similar coffee 12 staining behaviour occuring when protein solutions are deposited on a porous film substrate. (Wang et al 2008a)…”

Section: Optimizing Drying Conditionsmentioning

confidence: 99%

Fabrication of a Glucose Biosensor by Piezoelectric Inkjet Printing

Wang

Cook

Derby

2009

2009 Third International Conference on Sensor Technologies and Applications

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Inkjet printing has been used to fabricate glucose sensors using glucose oxidase and screen printed carbon electrodes. By appropriate selection of printing and drying conditions we are able to fabricate sensor structures that show a good linear response to glucose concentration.In order to achieve these structures we must carefully control the spreading and drying of the enzyme solution on the carbon electrode. Carbon electrode suirfaces are hydrophobic and Triton X was used as a surfactant to allow full coverage of the electrode surface. During drying, under ambient conditions the enzyme solution segregates to form a ring deposit (coffee staining). Coffee staining is shown to be deleterious to sensor performance and it can be removed by drying in a reduced humidity environment.

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Dye deposition patterns obtained in line printing on macroporous membranes: Improvement of line sharpness by liquid redistribution

Cited by 10 publications

References 20 publications

Formation of Coffee Stains on Porous Surfaces

Formation of Coffee Stains on Porous Surfaces

Evaluation of Sound Absorption, Printability, and Some Mechanical Properties of Thin Recycled Cellulosic Sheets Containing Wool, Ceramic Fiber, and Cotton Dust

Fabrication of a Glucose Biosensor by Piezoelectric Inkjet Printing

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