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Course10510620448 lectures

Colloids and Surfaces

Prof. Basavaraj Madivala Gurappa · IIT Madras

Start with lecture 1 At NPTEL

About

This course introduces the fundamentals of colloids and nanoparticle science, wherever possible applications of these concepts will be discussed.

Intended audience: B.E/M.E/M.Tech/Ph.D

Lectures

Week 1

  1. Introduction and motivation YouTube
  2. Colloidal dispersions, terminology and classification YouTube
  3. Stability in colloids YouTube
  4. Source, synthesis and characterisation of colloids YouTube
  5. Characterisation of colloidal particles - I YouTube

Week 2

  1. Characterisation of colloidal particles - II YouTube
  2. Introduction to forces acting on an individual colloidal particle YouTube
  3. Introduction to interaction between colloidal particles YouTube
  4. Application of Brownian force: Measument of diffusivity and size YouTube
  5. Origin of scattering YouTube
  6. Radiation used to study colloidal systems YouTube

Week 3

  1. Molecular origin of Van der waals forces YouTube
  2. Vanderwaal interactions between particles YouTube
  3. Problem on scaling of Vanderwaal interactions YouTube
  4. Calculation of Vanderwaal's forces between semi-infinite blocks and Hamaker constant - I YouTube
  5. Calculation of Vanderwaal's forces between semi-infinite blocks and Hamaker constant - II YouTube
  6. Theories of Vanderwaal forces based on bulk properties and calculation of Hamaker constant using bulk properties YouTube

Week 4

  1. Effect of medium on Vanderwaal's interactions - I YouTube
  2. Effect of medium on Vanderwaal's interactions - II YouTube
  3. Colloid Polymer mixtures YouTube
  4. Colloid polymer mixtures: colloid-solvent interactions & colloid-polymer interactions YouTube
  5. Colloid polymer mixtures: Depletion flocculation YouTube
  6. Colloid polymer mixtures: Depletion stabilisation YouTube

Week 5

  1. Depletion interactions YouTube
  2. Steric interactions/osmotic repulsion YouTube
  3. Tutorial problem on depletion interactions YouTube
  4. Colloidal Interactions: Introduction to electrostatic interactions/electrical double layer interactions YouTube
  5. Introduction to models of electrical double layer: Helmholtz model/capacitor model YouTube
  6. Review and summary of Helmholtz model (or capacitor model) of electrical double layer YouTube

Week 6

  1. Models of electrical double layer: Diffuse double layer model/Gouy-Chapman model YouTube
  2. Potential distribution near planar surfaces: Derivation of the Poisson-Boltzmann equation YouTube
  3. Potential distribution near planar surfaces: Solution to the linearised Poisson-Boltzmann equation YouTube
  4. Potential distribution near spherical surfaces: Solution to linearised Poisson-Boltzmann equation YouTube
  5. Comparison of Capacitor model and Diffuse double layer model YouTube

Week 7

  1. Models of electrical double layer: Gouy Chapman Theory - I YouTube
  2. Models of electrical double layer: Gouy Chapman Theory - II YouTube
  3. Structure of Electrical double layer YouTube
  4. Force of Repulsion between interacting surfaces YouTube
  5. Potential Energy of repulsion between Planar double layers and DLVO Theory YouTube

Week 8

  1. Zeta Potential and Electrophoretic mobility of an ion YouTube
  2. Electrokinetic Phenomena YouTube
  3. Relation between Electrophoretic mobility and Zeta potential - I YouTube
  4. Relation between Electrophoretic mobility and Zeta potential - II YouTube
  5. Colloidal particles at interfaces:Introduction YouTube
  6. Characterization of Particles at interface YouTube
  7. Experimental Observations -Concept of Electrostatic interactions and Stability at interfaces YouTube
  8. Implications from Surface energy balances & Estimation of energy required for detachment YouTube
  9. Colloidal interactions at interface YouTube

Syllabus and materials

At NPTEL, as the course publishes them.

Credits and licence

Institution
IIT Madras
Department
Chemical Engineering
Teacher
Prof. Basavaraj Madivala Gurappa
Level
Undergraduate
Language
English
Subjects
Chemistry, Engineering
Source
NPTEL
Licence
CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
Attribution
NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
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