NURSING EXAM QUESTIONS
PHARMACEUTICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the DLVO theory of colloids, normal thermal motion may be sufficient to overcome the energy barrier that leads to irreversible particle aggregation. The name of this energy barrier is which one of the following?
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Primary maximum
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Secondary maximum
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Primary minimum
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Secondary minimum
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Explanation:
Detailed explanation-1: -DLVO theory suggests that the stability of a colloidal system is determined by the sum of these van der Waals attractive (VA) and electrical double layer repulsive (VR) forces that exist between particles as they approach each other due to the Brownian motion they are undergoing.
Detailed explanation-2: -At contact, the DLVO profile is infinitely deep, but in reality there are repulsive forces acting at very short distances. The combination of these forces with the DLVO force profile results in a deep attractive well, which is referred to as the primary minimum.
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