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red to be 90° (note the contact radius he line tension here is r=0.5 nN, and the change with the liquid-solid contract ra

red to be 90° (note the contact radius he line tension here is r=0.5 nN, and the change with the liquid-solid contract ra

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4. A small liquid drop is placed on a solid surface. When the liquid-solid contact radius is 1=0.5 mm, the contact angle is measured to be 90° (note the contact radius here refers to the radius of the contact area). The liquid line tension here is r =0.5 nN, and the liquid surface tension is 50 mN/m. (a) How does the contact angle change with the liquid-solid contract radius r? How does the contact angle change when the =-0.5 nN? (b) Plot the contact e as a function of r for both cases (i.e. r, =0.5 nN and r=-0.5 nN)
Transcribed Image Text:4. A small liquid drop is placed on a solid surface. When the liquid-solid contact radius is 1=0.5 mm, the contact angle is measured to be 90° (note the contact radius here refers to the radius of the contact area). The liquid line tension here is r =0.5 nN, and the liquid surface tension is 50 mN/m. (a) How does the contact angle change with the liquid-solid contract radius r? How does the contact angle change when the =-0.5 nN? (b) Plot the contact e as a function of r for both cases (i.e. r, =0.5 nN and r=-0.5 nN)
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