Question

Given that a water-based liquid has yLv of ~72 dynes/cm, which of the two materials depicted below is more hydrophobic? Explain how the Zisman method is used to determine critical surface tension and how the critical surface tension relates to the surface properties of the material. (Figure adapted with permission from [23]. Ye~18 dynes/cm Y~45 dynes/cm) 1 0.8 0.6 0.4- 0.2 Cos 0 -0.2 -0.4 -0.6 -0.8 -1 Glass Teflon 06 180 80 20 40 60 yLv (dynes/cm or ergs/cm2) To measure critical surface tension (c) from Zisman plot: Start from Young's equation: ysv = ysl + ylo cosÎ¸, to show that solid surface free energy (Ïƒ) can be approximated by critical surface tension (c). Justify your answers and any assumptions you make.

          Given that a water-based liquid has yLv of ~72 dynes/cm, which of the two materials depicted below is more hydrophobic? Explain how the Zisman method is used to determine critical surface tension and how the critical surface tension relates to the surface properties of the material. (Figure adapted with permission from [23]. Ye~18 dynes/cm Y~45 dynes/cm)

1 0.8 0.6 0.4- 0.2 Cos 0 -0.2 -0.4 -0.6 -0.8 -1
Glass
Teflon
06
180 80
20 40 60 yLv (dynes/cm or ergs/cm2)

To measure critical surface tension (c) from Zisman plot: Start from Young's equation: ysv = ysl + ylo cosÎ¸, to show that solid surface free energy (Ïƒ) can be approximated by critical surface tension (c). Justify your answers and any assumptions you make.

77 given that a water based liquid has ylv of 72 dynescmwhich of the two materials depicted below is more hydrophobic explain how the zisman method is used to determine critical surface tens 23707

Added by Teresa A.

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