Calculate the surface tension for the solid/water interface (sw) if the droplet adopted a shape with the contact angle 60°. What is the surface tension for the solid/water interface (Ysw) if the droplet spreads over the surface? Estimate the average displacement of a molecule of a surfactant over the surface of the droplet within 0.001 s if the diffusion coefficient is 10-1⁰ m² s-1.

Calculate the surface tension for the solid/water interface (sw) if the droplet adopted a shape with the contact angle 60°. What is the surface tension for the solid/water interface (Ysw) if the droplet spreads over the surface? Estimate the average displacement of a molecule of a surfactant over the surface of the droplet within 0.001 s if the diffusion coefficient is 10-1⁰ m² s-1.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Crystallography

Crystallography is the category of science that focuses on the atomic and molecular arrangements with their bonding constituting the crystal structure. It is derived experimentally and originated in the year 1912. It is a combination of two words; those are crystal, meaning a cold drop, and graph, meaning writing.

Question

(d)
A small droplet of water is placed on a solid surface immersed in oil. The surface tension for
solid/oil interface (yso) is 60 mN m-1 and for water/oil interface (wo) is 40 mN m-¹.
• Calculate the surface tension for the solid/water interface (sw) if the droplet adopted a shape
with the contact angle 60°.
• What is the surface tension for the solid/water interface (Ysw) if the droplet spreads over the
surface?
• Estimate the average displacement of a molecule of a surfactant over the surface of the
droplet within 0.001 s if the diffusion coefficient is 10-1⁰ m² s-1.

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