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Lecturer(s)
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Lukáš David, prof. RNDr. CSc.
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Course content
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1. Introduction 1.1 History of the production of nanofibrous materials. 1.2 Introduction to electrostatic spinning as an example of nanofibrous technology. 1.3 Electrostatic field and its theoretical description. 1.4 Capillary effects and capillary pressure. I. Fundamentals of hydrodynamics and electrical spinning I.1 Introduction to Hydrodynamic Stability Analysis I.2 Basic hydrodynamic equations II. Disperse laws II.1 Dispersion law for gravity wave II.2 Capillary Wave Dispersion Law II.3 Dispersion law for capillary wave in the external electric field III. Electrostatic spinning from free surface of polymer solutions III.1 Analysis of dispersion law of capillary wave influenced by external electric field IV. Surface tension IV.1 Van der Waals's Force IV.2 Lennard-Jones potential IV.3 Basic concept of surface tension IV.4 The Concept of the Field of the Molecular Sphere with the Experiment IV.6 Capillary pressure, Laplace-Young equation V. Alternating electrical spinning VI. Method of mechanical drawing of individual nanofibers VII. Plateau-Rayleigh instability VIII. Evaporation of the solvent from the polymer nozzle and diffusion Excercise: Seminars
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Self-study (text study, reading, problematic tasks, practical tasks, experiments, research, written assignments), Laboratory work
- Class attendance
- 56 hours per semester
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Learning outcomes
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The electrical discharge from liquid points, and a hydrostatic method of measuring the electric intensity at their surfaces, Improvements in or relating to processes and apparatus for the production of artificial filaments, Disintegration of water drops in an electric field, Mass loss and distortion of freely falling water drops in an electric field, Effect of charge concentration on the shape of liquid jets by electrospinning, Relationship between fibre formation and viscosity, Role on entaglements on fibre formation, Multiple jets in electrospinning, Upward needleless electrospinning of multiple.
Student acquire knowledges of subject.
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Prerequisites
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Unspecified
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Assessment methods and criteria
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Oral exam, Written exam, Didactic test, Presentation of acquired knowledge via paper
Laboratory practice, exam
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Recommended literature
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Lukas D Sarka A Pokorny P. Self organization of jets in electrospinning from free liquid surface - a generalized approach, accepted for publication, Journal of Applied Physics, 103 (2008), 309-316.
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Lukáš D Sarkar A Martinová L Vodseďálková K Lubasová D Chaloupek J Pokorný P Mikeš P Chvojka J Komárek M. Physical principles of electrospinning (Electrospinning as a nano-scale technology of twenty-first century), Textile Progress, 41 (2009), 59-140, ISSN 0040-5167, ISBN-13:978-0-415-55823-5..
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S. Ramakrishna, K. Fujihara, W. Teo, T. Lim, and Z. Ma. An introduction to electrospinning and nanofibres, World Scientific Publishing Co., Singapor, 2005.
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Y. Filatov, A. Budyka, and V. Kirichenko. Electrospinning of micro- and nanofibres: fundamentals in separation and filtration processes, Begell House Inc., Redding, 2007.
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