Surface Chemistry Video Lectures
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About Surface Chemistry Video Lectures
Many important properties of matter are related to their Surfaces. Surfaces form the interface between two bulk phases such as solid-gas, solid-liquid, liquid-gas and liquid-liquid. Surface chemistry studies the processes that occur at the interface of two bulk phases. Processes such as dissolution and evaporation, to chemical reactions such us corrosion, crystallization, cataylysis and electrode processes. This video course studies features such as adsorption, catalysis, formation of colloids, and suspensions that pertain to surface phenomena
| Included in Surface Chemistry video lectures | Description |
|---|---|
| Surface Chemistry Introduction |
Introduction to key parts of Surface chemistry: Adsorption, Colloidal solutions, Catalysis; Phenomenon of adsorption; Adsorbate and Adsobent; Adsorption as a reversible reaction, vis-a-vis Absorption (which is a bulk phenomenon) which is an irreversible reaction;
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| Adsorption Part 1 Introduction |
Absorption and adsorption and their dependancy on temperature; Concept of Desorption; Sabatier and Senderens reaction example;
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| Adsorption Part 2 Sabatier And Senderens Reaction |
Continuation of Sabatier and Senderens reaction example; Use of adsorption in conversion of unsaturated fatty acids (like vegetable oil) to saturated fatty acids (like vegetable ghee)
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| Adsorption Part 3 Catalysis |
Continuation of examples of Catalysts and adsorption; Concept of heterogenous and homogeneous Catalysis; Example of Esterification reaction for homegenous catalysis
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| Adsorption Part 4 Types |
Definition of Sorption; Types of Adsorption - Physical (van der waals adsorption) and Chemical Adsorption (Langmuir adsorption); Review of forces of attraction - van der waals versus coloumbic force of attraction
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| Adsorption Part 5 Physical And Chemical Adsorption |
Examples of physical and chemical adsorption; Concept of chemical adsorption as an exception being irreversible reaction, e.g. Rusting; Heat of adsorption in Physical adsorption;
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| Adsorption Part 6 Stability |
Stability of chemical adsorption versus physical adsorption; Multilayer phenomenon in physical adsorption;
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| Adsorption Part 7 Review |
Recap of Surface Chemistry - Adsorption;
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| Adsorption Part 8 Review |
Continuing recap of Adsorption and examples; Adsorption as process per Thermodynamics, and review with respect to 1st law of Thermodynamics;
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| Adsorption Part 9 Thermodynamics |
Adsorption as process per Thermodynamics - review with respect to 2nd law of Thermodynamics; Free energy, Exothermic nature and Entropy of adsorption reactions;
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| Adsorption Part 10 Thermodynamics |
Concept that all three thermodynamical terms delta(G), delta(H) and delta(S) be negative in an adsorption reaction; Review of Le Chatliers principle and Equillibrium in Adsorption reactions; Concept that adsorption is favorable at lower temperatures due to delta(G) = -delta(H) + T * delta(S);
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| Adsorption Part 11 Factors Affecting Adsorption |
Factors effecting adsorption - Nature of adsorbate; Concept of good adsorbates, examples being gases which can be liquified easily;
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| Adsorption Part 12 Factors Affecting Adsorption |
Factors effecting adsorption - Nature of adsorbent; Examples of charcoal, used charcoal, activated charcoal; Example of finely divided adsorbents; Variation (graphs) of chemical and physical adsorption with temperature (difference being van der waal attraction vis-a-vis chemical bonds and attraction due to bonds)
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| Adsorption Part 13 Factors Affecting Adsorption |
Problems and examples in adsorption; Concept of Pressure effects on Adsorption - graphs;
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| Adsorption Part 14 Factors Affecting Adsorption |
Continuation of study of pressure effects on Adsorption, regions of effect as Pressure is increased; log(x/m) = log(k) + (1/n)log(p); Freundlisch adsorption isotherm;
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| Adsorption Part 15 Factors Affecting Adsorption |
Monolayer and multilayer formation and Adsorption with variance in Pressure; Langmuir adsorption isotherm;
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| Colloidal Solutions Part 1 Introduction |
More examples in adsorption; Introduction to Colloidal solutions; True solutions, colloidal solutions and suspensions; Colloidal solutions - homogenous and heterogenous systems; Concept of mixture as heterogenous solutions;
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| Colloidal Solutions Part 2 True Solutions |
True solutions as homogenous solutions with a particular constraint on solute particle size; Crystalloids as substances which make true solutions with solvents;
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| Colloidal Solutions Part 3 True Solutions |
Examples of crystalloids, examples drawn from ionic compoinds; Concept that Brownian movement is absent in True solutions;
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| Colloidal Solutions Part 4 Motion And Effects |
Concept that Tyndall effect is absent in True solutions; Explanation of Tyndall effect; Colloidal solutions - heteregenous nature, particle size; Colloids in colloidal solution; Brownian motion in Colloidal solutions;
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| Colloidal Solutions Part 5 Motion And Effects |
Concept that colloids cannot be filtered by ordinary filter paper, but by membranes or ultra filter paper; Small Angle Neutron Spectroscopy; Brownian motion in colloidal solutions; Tyndall effect in colloidal solutions;
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| Colloidal Solutions Part 6 Classification |
Classification of Colloidal Solutions - based on dispersion media (solvent), based on dispersed phase (solute), based on both and based on interaction between solute and solvent; Aquasol, Hydrosols, Aerosols; Benzosols, Organosols; Multi-molecular colloids, macro-molecular colloids and associated colloids; Colloids of polymers as macro-molecular colloids;
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| Colloidal Solutions Part 7 Suspensions |
Review of colloidal solutions and true solutions; Introduction to Suspensions;
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| Colloidal Solutions Part 8 Associated Colloids |
Associated colloids and examples like soaps and detergents;
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| Colloidal Solutions Part 9 Associated Colloids |
Examples of washing soap and bathing soaps, and hygroscopic feature of soaps with Sodium (Na); UV spectroscopy;
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| Colloidal Solutions Part 10 Associated Colloids |
Polar and non polar parts of soap molecules and using the concept to understand their solution with both polar and non polar solvents; Detergents and definition; Cationic anionic and non ionic detergents;
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| Colloidal Solutions Part 11 Surfactants |
Continuation of detergents; Linear Alkyl Benzene Sulphonate; Non ionic detergents and their solutions; Soaps and detergents as Surfactants or surface active agents; Variance of surface tenstion of solvents as the concentration of surfactants is increased; Critical Micelle Concentration of Surfactants;
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| Colloidal Solutions Part 12 Surfactants |
Review of surface tenstion of solution in presence of surfactants; Kraft temperature; Emulsification
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| Colloidal Solutions Part 13 Classification Review |
Review of classification of colloidal solutions based on dispersed phase and dispersed medium; Examples of dispersed phase (DP) and dispersion medium (DM);
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| Colloidal Solutions Part 14 Examples |
Continuation of examples of dispersed phase (DP) and dispersion medium (DM); Solid-solid, solid-liquid and solid-gas colloidal solutions (Alloys, Sols and Aerosols); Liquid-solid, liquid-liquid and liquid-gas solutions (Examples - Gels, emulsions and fog); Gas-solid, gas-liquid colloidal solutions (Examples bread, foam);
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| Colloidal Solutions Part 15 Interactions |
Concept that gas-gas cannot form a colloidal solution (molecular size of solute and solvent are comparable); Introduction to interaction between dispersed phase and dispersed medium and classification of colloidal solutions based on the interaction; Lyophilic and lyophobic solutions; Reversibility, Viscosity and Surface tension in Lyophilic and lyophobic solutions;
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| Colloidal Solutions Part 16 Interactions |
Examples of Lyophilic and Lyophobic solutions; Preparation of colloidal solutions; Condensation and Dispersion methods; Reduction, oxidation and double displacement methods of Condesation for preparing Colloidal solutions;
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| Colloidal Solutions Part 17 Methods Of Preparation |
Oxidation method of Condensation; Double displacement method of Condensation; Excessive cooling method of Condensation; Discussion on solubility of Ether in water;
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| Colloidal Solutions Part 18 Methods Of Preparation |
Formation of colloidal solution by Solvent exchange; Dispersion methods for preparation of Colloidal solutions; Mechanical dispersion and Electrical dispersion; Bredig's arc method;
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| Colloidal Solutions Part 19 Methods Of Preparation |
Continuation of Electrical dispersion; Usage of electrical dispersion for preparation of colloidal solutions with Metals; Review and examples of Colloidal Solutions
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| Colloidal Solutions Part 20 Selective Adsorption |
Peptization as a process of conversion of precipitates into colloidal solutions by adding suitable electrolyte; Source of charge (positive or negative) on dispersed phase (DP) of lyophobic colloids and Selective adsorption theory; Tendency of DP particles to adsorb charge selectively on their surfaces; Example of colloidal solution made from Fe(OH)3 and the example that it selectively adsorbs Fe3+ ions to become slectively positively charged; More examples of positively charged and negatively charged colloids; Behavior of colloida solutions (e.g. formed with alpha amino acids or priteins) in acidic and basic media; Example that when amino acids are taken in basic medium the particles become negatively charged and can move towards positive terminal, whereas in acidic medium the particles become positively charged (H+ ion attacking lone pair of Nitrogen found in the amino acid) and can move towards negative terminal and leading to definition of Zwitter ionic character; Isoelectric point; Electro kinetic potential or Zeta potential; Concept that solubility is proportional to Ksp;
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| Colloidal Solutions Part 21 Physical Properties Review |
Stability of lyophilic and lyophobic colloidal solutions; Purification of colloids - using Dialysis, Electrodialysis, Ultrafilteration and Ultracentrifugation; Physical properties of colloids, transparency of colloidal solutions, brownian movement, optical property, electric property; Electrophoresis and movement of dispersed phase (DP) particles under the influence of electric potential; Electro-osmosis; Coagulation as conversion of colloidal solution into precipitate by adding a suitable electrolyte; Hardy Schulze rule; Flocculation value of an electrolyte used to coagulate a standard sol; Protective colloids; Gold number and strength of protective colloid;
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