Ch 4 Notes - 1 Chapter 4- Colloids Colloidal systems refer...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Chapter 4- Colloids Colloidal systems refer to those containing a discreet phase of one materials dispersed in a separate phase of a second material. Colloidal systems may involve all permutations of gases, liquids, and solids. (See Table 4.1) Colloids (the dispersed phase) exist over the size range of 1-1000 nm. A solution containing colloidal particles is call a sol . http://online.nanopolis.net/subjects/icon_colloids.JPG 2 Chapter 4: Colloids Chapter 4: Colloids KEY CONCEPTS KEY CONCEPTS (Note the application of key concepts from previous chapters (Note the application of key concepts from previous chapters in the present discussion) in the present discussion) What are colloids and what are their practical applications? How What are colloids and what are their practical applications? How do colloidal do colloidal particles form and what are the mechanisms by which they acquire particles form and what are the mechanisms by which they acquire and exhibit and exhibit surface charge/potential? How does the surface charge/potential surface charge/potential? How does the surface charge/potential vary as a vary as a function of distance away from the surface. function of distance away from the surface. (condensation, comminution; surface charge acquisition by dissociation, adsorption of ionic constituents; surface potential) What is the role of surface charge/potential in interfacial proc What is the role of surface charge/potential in interfacial proc esses such as esses such as dispersion and coagulation of colloidal suspensions? dispersion and coagulation of colloidal suspensions? (long range electrostatic forces) What are the models that describe/predict interaction potential What are the models that describe/predict interaction potential energy/forces energy/forces between two approaching surfaces? between two approaching surfaces? (Helmholtz; Guy-Chapman; Electrical Double Layer; DLVO) How can we measure/estimate interaction potential energy/forces How can we measure/estimate interaction potential energy/forces between two between two approaching surfaces and select additives to achieve suspensio approaching surfaces and select additives to achieve suspensio n dispersion or n dispersion or coagulation? coagulation? (Concentration and valency effects; CCC;) What determines the kinetics of coagulation? What determines the kinetics of coagulation? 3 Group problem: What is the resulting surface area when a single particle 1 cm in radius is divided into equivalent, discreet particles 1 nm in radius?...
View Full Document

Page1 / 5

Ch 4 Notes - 1 Chapter 4- Colloids Colloidal systems refer...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online