کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
593534 | 1644963 | 2013 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Modeling of spatial–temporal distribution of the components in the drying sessile droplet of biological fluid Modeling of spatial–temporal distribution of the components in the drying sessile droplet of biological fluid](/preview/png/593534.png)
• Final shape of the droplet is a doughnut.
• Proteins accumulate near the edge of the dried drop.
• Salts are distributed uniformly across the diameter of the dried drop.
Using lubrication theory, drying processes of sessile droplets of blood serum (i.e. colloids with the salt admixture) on a solid hydrophilic horizontal substrate are studied. The concentration of the solute is supposed to be high enough to ensure good adhesion and strong anchoring (pinning) of the triple line, thereby a drop is desiccating with constant base. The simulation of spatial distribution of the components in the droplet of biological fluid drying on a substrate is performed using advection–diffusion equation. The proposed model explains the redistribution of components in a sessile drop of biological fluid when it dries. Competition between advection and diffusion leads to large particles (protein) accumulating at the edge of the drop (well-known coffee-ring effect), while solutes (salts) are distributed more uniformly across the diameter of the sample.
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Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 432, 5 September 2013, Pages 99–103