3 research outputs found
Mechanistic Understanding and ThreeâDimensional Tuning of Fluid Imbibition in SilicaâCoated Cotton Linter Paper Sheets
Paperâbased microfluidic devices are used in point of care diagnostic, sensor technology or labâonâaâchip devices. Although a number of studies has been reported, only relatively few paperâbased diagnostic tools are available on the market. A remaining challenge is the mechanistic understanding and precise design of capillary flow in paper. Here, silica coatings are applied to control paper wettability, fiber swelling, and thus fluid transport in all three dimensions of a paper sheet via a simple dipâcoating and postâtreatment process. By adjusting the threeâdimensional silica coating distribution, a threeâdimensional asymmetric wettability gradient within the paper sheet is obtained which controls the fluid distribution and imbibition. The correlation between silica coating amount and silica distribution with the resulting fluid behavior is systematically elaborated by analyzing the interaction between fiber and fluid as well as the fiber swelling by applying confocal microscopy. Three different silicaâamount dependent fluid distribution states are demonstrated. These new insights into the mechanism of fluid imbibition using simple silica coatings enable the specific design of different imbibition mechanisms and thus the adjustment of the microfluidic properties in paperâbased microfluidic devices with control over all three spatial dimensions of a paper sheet in one fabrication step
Mechanistic Understanding and Three-Dimensional Tuning of Fluid Imbibition in Silica-Coated Cotton Linter Paper Sheets: Public Data
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