1. SHELLY DALAL 2 Fiber is a rope used as a component of
composite materials into sheets to make products such as paper.
Fiber Fibers are classified into two categories 1.Natural Fibers
2.Manufactured Fibers.
2. SHELLY DALAL 3 Classification of fibers 1. Natural fibers. :
2. Manufactured fibers. : Natural fibers are taken from animal,
vegetable, or mineral sources. Manufactured fibers are chemically
produced. Like Nanofibers are produced by an electrospinning
process. It is manufactured fiber. 3. SHELLY DALAL 4 Nanofibers are
defined as fibers with diameters less than 100 nanometers. or
smaller. (1 nm = 10-9 m) Generally Nanofibers are produced by an
electrospinning process Nanofibers 4. SHELLY DALAL 5
Electrospinning process A- polymer solution in syringe B- metal
needle C- high voltage D- Nanofibers E- Nanofibers collection on
Rotating collector 5. SHELLY DALAL 6 Electrospinning process A
polymer solution is injected at a constant feed rate though a
nozzle or needle which is charged to a high voltage (10kv to 30kv).
The applied voltage is sufficiently high, the surface of the fluid
elongates and a Taylor cone is established. On increasing the
applied voltage further, a charged liquid jet is ejected from the
Taylor cone and attracted to the earthed collector, which is
positioned at a fixed distance from the needle. During this process
the solvent evaporates from the polymer solution, leaving dry
polymer fibers on the collector. 6. SHELLY DALAL 7 Effect of
process parameters on fiber diameter FiberDia. Collector Distance
in cm. 12 20 27 FiberDia. Flow Rate in gm/Hour 3 5 7 1. Nanofiber
properties depend on distance between needle and collector. 2. At
present the production rate of this process is measured in grams
per hour. 7. SHELLY DALAL 8 Polymers used for Electrospinning
Polyglycolic acid (PGA) Polylactic acid (PLA) PGA - PLA
Polydioxanone (PDO) Polycaprolactone (PCL) PGA - PDO PLA PCL PDO -
PCL Polymer solutions or melts More than 30 polymers, including
polyethylene oxide, DNA, polyaramids, and polyaniline, have been
electrospun. These fibers can be made of variety organic (nylon,
polyester, acryl) or biological polymers (proteins, collagens). 8.
SHELLY DALAL 9 Tested Polymers Test Polymer Solvent Voltage [kV]
Electrospinning I PEO poly(ethylene oxide) 40% water 60% ethanol
mixture 3 12 good and stable process for voltage up to 10kV II DBC
dibutyrylo chitin ethanol 6 16 fairly good III TAC cellulose
triacetate methylo chloride 3 30 polymer too viscous 10 30
difficult IV PAN polyacrylonitrile dimethyl- formamide (DMF) 5 25
very good V Glycerol water 20 30 difficult, lack of solidification
cause that the liquid jet is separated into small droplets
(electrospray) 9. SHELLY DALAL 10 Year Author Achievements 1914
Zeleny The first one observed spinning behavior of conducting
polymer solution in electric filed 1934 Formahl The first patent
related to the electrospinning process 1981 Larrondo and Manley
Investigation of electrospinning using melted polymer 1996 Reneker
and Chun The probability of electrospinning using different kind of
polymer solutions was proved History of Electrospinning 10. SHELLY
DALAL 11 Comparisons 11. SHELLY DALAL 12 Comparison between human
hair and Nanofibers 12. SHELLY DALAL 13 Comparison of red blood
cell with Nanofibers 13. First Nanofibers produced in the Material
Science Lab, IMSP, UPLB SHELLY DALAL 14 IMPS - Institute of
Mathematical Sciences and Physics UPLB University of the
Philippines Los Banos 14. SHELLY DALAL 15 Uses of Nanofibers 15.
SHELLY DALAL 16 Nanofibers use in Cosmetic Application skin
cleansing Brush skin Healing nanofibers skin Therapy with medicines
16. SHELLY DALAL 17 Nanofibers use in Military Protective Cloths
Military Protective Cloths 17. SHELLY DALAL 18 Nanofibers use in
Life science 18. SHELLY DALAL 19 Nanofibers use in Filter Media Oil
Filter Gas Filter 19. SHELLY DALAL 20 Nanofibers use in Nano
Sensors 20. SHELLY DALAL 21 References http://www.authorstream.com/
http://en.wikipedia.org www.slideshare.net www.powershow.com
https://moodle.fp.tul.cz/nano/mod/ www.fzu.cz/~nanoteam 21. SHELLY
DALAL 22 Electrospinning process Video Electrospinning Technique
22. SHELLY DALAL 23
