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Coffee commercial cleaning services ring effect song by the University of Chicago Robert D. Deegan proposed physical interpretation, and "Capillary flow as the cause of ring stains from dried liquid drops" published in 1997 in Nature. Deegan commercial cleaning services droplets that fell on the table, because the inside and outside different evaporation rates caused by capillary flow, the edge of the evaporation commercial cleaning services of liquid droplets of the liquid by the supplement, it can produce almost all the outward flow of the liquid droplets toward the edge, resulting in an annular configuration. Deegan literature widely cited, coffee ring effect is also used in printing, surface coating technology and medical commercial cleaning services examination.
Brown University Shreyas commercial cleaning services Mandre et al further use of scanning electron microscopy and mathematical models to conduct a detailed study on the coffee ring that patterned deposition of particles, able to evaporation and surface tension and other physical parameters. The researchers found that the annular deposition stage, if the concentration exceeds a certain threshold, it will deposit a layer of uniform thickness particulate layer below this boundary sediments forming a non-uniform stripe [non-uniform bands]. As the edge of the solid-liquid interface droplet evaporation rate than the flow from the inside replenishment rate is high, let particles remain in the edge of the dry solid and deposition.
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