Diet Coke and Mentos: What is really behind this physical reaction?
SEM images of table salt, acquired with a beam energy of and a spot size of . The scale bars represent the following lengths: (a) ; (b) , (c) , and (d) . Figure 1(a) qualitatively demonstrates that the small cubic table salt grains have a high surface area to volume ratio, thus providing many growth sites for the carbon dioxide in the Diet Coke. Figure 1(b) shows rough patches and nooks and crannies in the salt, which are also excellent growth sites. Figure 1(c) is a magnified view of the edges of a salt grain, and Fig. 1(d) is a magnified view of the top of a salt grain.
SEM images of Mint Mentos [(a) and (c)] and Fruit Mentos with a candy coating [(b) and (d)]. The scale bars in each image represent the lengths (a) , (b) , (c) , and (d) . The images were acquired with a beam energy of and a spot size of . The lower magnification image of the Fruit Mentos has smooth patches in contrast to the lower magnification image of the Mint Mentos, but the candy coating is not uniform. The higher magnification image of the Fruit Mentos is zoomed in on one of the rougher patches.
SEM images of playground sand acquired at a beam energy of and a spot size of . The scale bar for (a) is and for (b) is .
Sample contact angle images for (a) deionized water, (b) deionized water with added aspartame, and (c) deionized water with added potassium benzoate. Note that the contact angle for the aspartame and potassium benzoate solutions is less than the contact angle for pure water, indicating a decrease in the surface tension.
Contact mode AFM image of Mint Mentos. The quantitative roughness information detailed in Table V was taken from this image.
Contact mode AFM image of Wint-o-Green Lifesaver. The quantitative roughness information detailed in Table V was taken from this image.
Average mass lost during the reaction. The uncertainty is approximately 10%.
Average horizontal distance traveled by the spray during the reaction. The uncertainties are approximately 10%.
Temperature of a bottle of Diet Coke and mass lost during the reaction when of Mint Mentos is added to the Diet Coke. Only one trial was performed for each temperature.
Contact angles of various solutions on polycarbonate and the ratio of the minimum work required to form a critical bubble in the sample over the minimum work required to form a critical bubble in deionized .
The rms roughness of a image acquired in the AFM.
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