619-3008/02 – Dispersion Systems (DS)

Gurantor departmentDepartment of Physical Chemistry and Theory of Technological ProcessesCredits6
Subject guarantorprof. Ing. Jana Dobrovská, CSc.Subject version guarantorprof. Ing. Jana Dobrovská, CSc.
Study levelundergraduate or graduateRequirementCompulsory
Year1Semestersummer
Study languageCzech
Year of introduction2019/2020Year of cancellation
Intended for the facultiesFMTIntended for study typesFollow-up Master
Instruction secured by
LoginNameTuitorTeacher giving lectures
DOB30 prof. Ing. Jana Dobrovská, CSc.
DRO0013 Ing. Ľubomíra Drozdová
DOC01 Ing. Simona Zlá, Ph.D.
Extent of instruction for forms of study
Form of studyWay of compl.Extent
Full-time Credit and Examination 3+3

Subject aims expressed by acquired skills and competences

- to use of thermodynamic quantities for the description of colloidal and coarse dispersed systems, - to describe the properties of colloidal dispersion systems - kinetic, mechanical, electrical and optical, - to monitor the stability of disperse systems, the possibility of influencing stability, - to assess the effect of interfacial properties on heterogeneous disperse systems - interfacial tension, contact angle, Young-Laplace equation, Kelvin equation, the Gibbs adsorption isotherm, adsorption equilibrium, - to apply obtained theoretical knowledge in tutorials and laboratory and on selected processes of chemical practice.

Teaching methods

Lectures
Individual consultations
Tutorials
Experimental work in labs

Summary

This course deals with the physico-chemical properties of colloidal systems, surfaces and multiphase systems. Classifies dispersion systems, based on the dispersity, particle size distribution function, optical, electrical, molecular-kinetic properties of colloidal systems, and the structure of colloidal particles. Describes the physical chemistry of phase boundaries, phase dispersion systems, molecular colloids.

Compulsory literature:

ADAMSON, Arthur W. Physical chemistry of surfaces. 5th ed. New York: Wiley, c1990. ISBN 0-471-61019-4. ATKINS, P. W. a J. DE PAULA. Atkins' Physical chemistry. 10th ed. Oxford: Oxford University Press, c2014. ISBN 978-0-19-969740-3.

Recommended literature:

HUNTER, Robert J. Foundations of colloid science. 2nd ed. Oxford: Oxford University Press, c2001. ISBN 0-19-850502-7. Shaw, D. J.: Introduction to colloid and surface chemistry, 3rd Edition, London 1980. FONG, Peter A., ed. Colloid and surface research trends. New York: Nova Science Publishers, c2007. ISBN 978-1-60021-593-3.

Way of continuous check of knowledge in the course of semester

FULL-TIME STUDY List of conditions for obtaining of credit: - required attendance at the exercises - two written tests - passing the required number of laboratory exercises, elaboration and defense of laboratory protocols. Points scoring for credit: Min. number of points - 20 Max. number of points - 45 Points scoring for examination - combined examination. The examination consists of two parts - written and oral examination. Written examination (min. number of points - 5, max. number of points - 15) Oral examination (min. number of points - 10, max. number of points - 40)

E-learning

Other requirements

No other activities are required.

Prerequisities

Subject has no prerequisities.

Co-requisities

Subject has no co-requisities.

Subject syllabus:

1. Colloidal systems. Preparation, condensation and dispersion methods, significance in industry and environment, degree of dispersion, particle size distribution functions and experimental determination of particle size distributions. 2. Properties of colloidal systems – optical (Tyndall effect, nefelometry), kinetic (Brownian motion, diffusion of colloidal particles) and electrical (electrophoresis, sedimentation potential, streaming potential, electro- osmosis). 3. Structure of colloidal particles. Electrical charge of colloidal particles, micelle, theory and models of electrical double layer - Helmholtz double layer, Gouy-Chapman double layer, Stern modification of diffuse double layer. Lyophilic and lyophobic colloids, preparation and stability. 4. State changes of colloidal systems. Coagulation, coalescence, sols and gels, xerogels, swelling, thixotropy. Methods for separations colloidal systems. Dialysis, electrodialysis, filtration, electro- ultrafiltration, ultrafiltration, electro-decantation. 5. Coagulation. Coagulation threshold. Coagulation and adsorption. Hardy- Schultz rule, lyotropic (Hofmeister) series. Coagulation kinetics of monodispersed systems. Basic conceptions of coagulation kinetics of polydispersed systems. Swelling kinetics. 6. Sedimentation of colloid particles. Sedimentation in the gravitational field and sedimentation in the centrifugal field. Sedimentation equilibrium and rate. Determination of molar masss weight by sedimentation. 7. Motion of colloidal particles. Stokes' law. Diffusivity and mobility of colloidal particles. Movement of colloidal particles in electric field. 8. Passage of dispersion systems through membranes. Theory of the Donnan membrane equilibrium. Osmotic pressure and viscosity of colloidal systems. Einstein relation. 9. Emulsions - preparation and stability. Emulsifiers, stabilisers of emulsions, their physicochemical action. Foams, preparation, stability and utilization. 10. Surface phenomena. Free surface energy, surface and interfacial tension. Wetting of solid surface by liquid, Laplace equation, contact angle, measurement methods. Interfacial phenomena on interface between two immiscible liquids. Surface films. 11. Adsorption on liquid-liquid and gas-liquid phase interface. Gibbs adsorption isotherm, surface-active and surface-nonactive agents. Flotation principles. 12. Adsorption on liquid-solid and gas-solid phase interface. Adsorption of gases on solid surfaces. Adsorption from solutions on solids. Adsorption isotherms (Freundlich and Langmuir isotherms, BET model of adsorption). Factors affecting adsorption. Adsorption hysteresis. Adsorption kinetics. 13. Angular phase interface. Kelvin’s equation. Dissolution of solid substances. Thermodynamics and kinetics of crystallization from solutions. Distribution coefficient, principles of extraction. 14. Polymer systems. Theory and thermodynamics of macromolecules. Flory- Huggins theory. Theoretical exercises: - Introduction - introduction to exercise timetable, conditions for obtaining credit and recommended reading. Size of dispersed particles, the degree of dispersity, differential and integral distribution function of particle size, average molar mass. - Electrokinetic phenomena, kinetics of coagulation. - Sedimentation and gross sedimentation equilibrium colloidal dispersion systems. - Osmotic pressure, membrane equilibrium membrane hydrolysis. - Surface films, adsorption of the movable interface. - Adsorption on a solid phase interface from the gas phase and solution. - Calculation test. Laboratory exercises: - Safety in the laboratory, an introduction to laboratory assignments, basic information on the exercises and the formulation of requirements for protocol processing. - Determination of the constants of adsorption isotherm of acetic acid on charcoal. - Determination of strongly acidic cation exchange capacity in a standard condition. - The critical micelle concentration of sodium lauryl sulfate. - The titration curves of ion exchangers. - Determination of the degree of swelling depending on the pH of the gelatin solution. - Adsorption on a mobile interface. - Sizing hydration package of gelatin. - Adsorption of methylene blue on activated carbon. - Determination of some physical properties of ion exchangers. - Evaluation of content and formal level protocols, credit.

Conditions for subject completion

Full-time form (validity from: 2019/2020 Summer semester)
Task nameType of taskMax. number of points
(act. for subtasks)
Min. number of points
Credit and Examination Credit and Examination 100 (100) 51
        Credit Credit 45 (45) 20
                Písemka Written test 28  0
                Laboratorní práce Laboratory work 15  0
                Jiný typ úlohy Other task type 2  0
        Examination Examination 55 (55) 15
                Písemná zkouška Written examination 15  5
                Ústní zkouška Oral examination 40  10
Mandatory attendence parzicipation: 86% participation in the theoretical exercises of the given subject 100% participation in the laboratory exercises of the given subject

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Occurrence in study plans

Academic yearProgrammeField of studySpec.ZaměřeníFormStudy language Tut. centreYearWSType of duty
2021/2022 (N0712A130004) Chemical and environmental engineering TCH P Czech Ostrava 1 Compulsory study plan
2020/2021 (N0712A130004) Chemical and environmental engineering TCH P Czech Ostrava 1 Compulsory study plan
2019/2020 (N0712A130004) Chemical and environmental engineering TCH P Czech Ostrava 1 Compulsory study plan

Occurrence in special blocks

Block nameAcademic yearForm of studyStudy language YearWSType of blockBlock owner