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Physical chemistry

of surface phenomena. Basics

of adsorptive

therapy

SURFACE PHENOMENA SURFACE PHENOMENA

are phenomena associated with the existence of interphase boundaries.

SURFACE PHENOMENA ARE STUDIED BY COLLOID CHEMISTRY

Surface Surface phenomena phenomena

-Inside the fluid forces are balanced Inside the fluid forces are balanced

-From the side of gas resultant is directed From the side of gas resultant is directed

into the interface between the liquid and into the interface between the liquid and

the liquid tends to decrease the liquid tends to decrease

Surface phenomena Surface phenomena

The increased surface area of the phase separation

is associated with the transition of molecules from the depth of the phase on the surface. This work of dW is proportional to the square of the formed surface dS:

-dW=σ·dS

σ- the coefficient of proportionality, called surface

tension.

Surface tension  is the work required for the creation of 1 m2 of surface

[]= J/m2

Surface tension is the excessive energy, referred to a unit surface area of the phase separation = Е/ S

THE SURFACE ENERGY THE SURFACE ENERGY THE SURFACE TENSION THE SURFACE TENSION