Unit III.pptx
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Certain molecules and ions, when dispersed in a liquid, spontaneously move to the liquid interface where their concentration exceeds that in the bulk liquid. This phenomenon, called positive adsorption, reduces the surface free energy and surface tension of the system. In contrast, some materials like inorganic electrolytes are partitioned toward the bulk liquid, increasing surface free energy and tension in a process termed negative adsorption. Adsorption only affects the surface, unlike absorption which involves penetration into the absorbing medium.
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Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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PCOS corelations and management through Ayurveda.
This presentation includes basic of PCOS their pathology and treatment and also Ayurveda correlation of PCOS and Ayurvedic line of treatment mentioned in classics.
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Unit III.pptx
- 1. Adsorption at Liquid Interfaces • Surface free energy was defined previously as the work that must be done to increase the surface by unit area. As a result of such an expansion, more molecules must be brought from the bulk to the interface. The more work that has to be expended to achieve this, the greater is the surface free energy. • Certain molecules and ions, when dispersed in the liquid, move of their own accord to the interface. Their concentration at the interface then exceeds their concentration in the bulk of the liquid. Obviously, the surface free energy and the surface tension of the system are automatically reduced. • Such a phenomenon, where the added molecules are partitioned in favor of the interface, is termed adsorption, or, more correctly, positive adsorption. • Other materials (e.g., inorganic electrolytes) are partitioned in favor of the bulk, leading to negative adsorption and a corresponding increase in surface free energy and surface tension. • Adsorption should not be confused with absorption. The former is solely a surface effect, whereas in absorption, the liquid or gas being absorbed penetrates into the capillary spaces of the absorbing medium. • The taking up of water by a sponge is absorption; the concentrating of alkaloid molecules on the surface of clay is adsorption.
- 2. Adsorption at Liquid Interfaces2 • Surface free energy was defined previously as the work that must be done to increase the surface by unit area. As a result of such an expansion, more molecules must be brought from the bulk to the interface. The more work that has to be expended to achieve this, the greater is the surface free energy. • Certain molecules and ions, when dispersed in the liquid, move of their own accord to the interface. Their concentration at the interface then exceeds their concentration in the bulk of the liquid. Obviously, the surface free energy and the surface tension of the system are automatically reduced. • Such a phenomenon, where the added molecules are partitioned in favor of the interface, is termed adsorption, or, more correctly, positive adsorption. • Other materials (e.g., inorganic electrolytes) are partitioned in favor of the bulk, leading to negative adsorption and a corresponding increase in surface free energy and surface tension. • Adsorption should not be confused with absorption. The former is solely a surface effect, whereas in absorption, the liquid or gas being absorbed penetrates into the capillary spaces of the absorbing medium. • The taking up of water by a sponge is absorption; the concentrating of alkaloid molecules on the surface of clay is adsorption.