NPTEL : NOC:Colloids and Surfaces (Chemical Engineering)

Co-ordinators : Prof. Basavaraj Madivala Gurappa


Lecture 1 - Introduction and motivation

Lecture 2 - Colloidal dispersions, terminology and classification

Lecture 3 - Stability in colloids

Lecture 4 - Source, synthesis and characterisation of colloids

Lecture 5 - Characterisation of colloidal particles - I

Lecture 6 - Characterisation of colloidal particles - II

Lecture 7 - Introduction to forces acting on an individual colloidal particle

Lecture 8 - Introduction to interaction between colloidal particles

Lecture 9 - Application of Brownian force: Measument of diffusivity and size

Lecture 10 - Radiation used to study colloidal systems

Lecture 11 - Radiation used to study colloidal systems

Lecture 12 - Molecular origin of Van der waals forces

Lecture 13 - Vanderwaal interactions between particles

Lecture 14 - Problem on scaling of Vanderwaal interactions

Lecture 15 - Calculation of Vanderwaal's forces between semi-infinite blocks and Hamaker constant - I

Lecture 16 - Calculation of Vanderwaal's forces between semi-infinite blocks and Hamaker constant - II

Lecture 17 - Theories of Vanderwaal forces based on bulk properties and calculation of Hamaker constant using bulk properties

Lecture 18 - Effect of medium on Vanderwaal's interactions - I

Lecture 19 - Effect of medium on Vanderwaal's interactions - II

Lecture 20 - Colloid Polymer mixtures

Lecture 21 - Colloid polymer mixtures: colloid-solvent interactions and colloid-polymer interactions

Lecture 22 - Colloid polymer mixtures: Depletion flocculation

Lecture 23 - Colloid polymer mixtures: Depletion stabilisation

Lecture 24 - Depletion interactions

Lecture 25 - Steric interactions/osmotic repulsion

Lecture 26 - Tutorial problem on depletion interactions

Lecture 27 - Colloidal Interactions: Introduction to electrostatic interactions/electrical double layer interactions

Lecture 28 - Introduction to models of electrical double layer: Helmholtz model/capacitor model

Lecture 29 - Review and summary of Helmholtz model (or capacitor model) of electrical double layer

Lecture 30 - Models of electrical double layer: Diffuse double layer model/Gouy-Chapman model

Lecture 31 - Potential distribution near planar surfaces: Derivation of the Poisson-Boltzmann equation

Lecture 32 - Potential distribution near planar surfaces: Solution to the linearised Poisson-Boltzmann equation

Lecture 33 - Potential distribution near spherical surfaces: Solution to linearised Poisson-Boltzmann equation

Lecture 34 - Comparison of Capacitor model and Diffuse double layer model

Lecture 35 - Models of electrical double layer: Gouy Chapman Theory - I

Lecture 36 - Models of electrical double layer: Gouy Chapman Theory - II

Lecture 37 - Structure of Electrical double layer

Lecture 38 - Force of Repulsion between interacting surfaces

Lecture 39 - Potential Energy of repulsion between Planar double layers and DLVO Theory

Lecture 40 - Zeta Potential and Electrophoretic mobility of an ion

Lecture 41 - Electrokinetic Phenomena

Lecture 42 - Relation between Electrophoretic mobility and Zeta potential - I

Lecture 43 - Relation between Electrophoretic mobility and Zeta potential - II

Lecture 44 - Colloidal particles at interfaces:Introduction

Lecture 45 - Characterization of Particles at interface

Lecture 46 - Experimental Observations -Concept of Electrostatic interactions and Stability at interfaces

Lecture 47 - Implications from Surface energy balances and Estimation of energy required for detachment

Lecture 48 - Colloidal interactions at interface