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Liquid crystals shreyas

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Liquid Crystal Phase & it's uses

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Liquid crystals shreyas

  1. 1. Liquid Crystals Presented by- Mr.Shreyas R. Kulkarni M.Pharm.(Pharmaceutics) Roll no.-11 Guided by –Dr.Vishal V. Pande sir HOD (Pharmaceutics,PG Dept.) S.C.P.E.R, Kopargaon 123-03-2018
  2. 2. • Learning Objectives 1. Introduction 2. History 3. Classification 4. Nematic Liquid Crystals 5. Smectic Liquid Crystals 6. Cholesteric Liquid Crystals 7. Discotic Liquid crystals 8. Applications 9. Conclusion 10. University Questions 11. References 223-03-2018
  3. 3. Basic Terminology: Mesophase- A Phase lying between solid & liquid formed by changing amount of order in sample. Anisotropy- Object or substance having a physical property which has a different value when measured in different directions. Isotropy- When the properties of material are the same in all direction, the material is said to be Isotropy. 23-03-2018 3
  4. 4. •Introduction • Liquid Crystals are matter in state which has properties between the convensional liquids and solids. • It’s shows Anisotropy. 423-03-2018
  5. 5. • History Anchen Scientist Otto Lehman  On 3 May,1888 Lehman with help of Freidrich Reinitzer published their first result on Liquid crystals. 523-03-2018
  6. 6. 623-03-2018
  7. 7. • History •In early of 1962 the RCA Laboratories firstly used the electronic display made with liquid crystals. •Ex. cyanobiphenyl 723-03-2018
  8. 8. LiquidCrystals Lyotropic Liq. crystal Thermotropic Liq. Crystal Polymeric Liq. Crystal • Classification 823-03-2018
  9. 9. • In solvent • Depends on Temperature, Concentration, salt, alcohol • Structures: Lamellar, Hexagonal etc For Ex. 1) Soap, it is the day to day life example of lyotropic liquid crystals. 2) Phospholipids (present in cell membrane) 1. Lyotropic liquid crystals 23-03-2018 9
  10. 10. 2.Thermotropic Liquid Crystals • These are the liquid crystaline phases that occures due to change in temprature range. • Absence of solvent • Rigid organic molecules • Depends on Temperature • Structures: a) Smectic b) Nematic c) Cholesteric 1023-03-2018
  11. 11. These are basically the mesogenic unit is incorporated in the polymeric molecule. Ex. electrical and mechanical parts, food containers, and any other applications requiring chemical inertness and high strength. 3. Polymeric Liquid Crystals 1123-03-2018
  12. 12. Classification of Thermotropic Liq. Crystal 1223-03-2018
  13. 13. Phases of Liquid Crystals 1323-03-2018
  14. 14. • Nematic Phase • No possitional order • Molecules in same direction • When temperatures is incrase molecules will be allign immediately • In nematic crystal phase molecules are arranged paralell • Ex. Cyanobiphenyl 1423-03-2018
  15. 15. • Smectic Phase • This phase can be reached at lower temperatures than the nematic phase. • Not all positional order is destroyed when a crystal melts to form a smectic liquid crystal 1523-03-2018
  16. 16. • Cholesteric Phase • Chiral nematic phase • This phase exhibits the twisting of the molecules perpendicular to the director. • Ex. Cholesterol Benzoate:LC 147C 1623-03-2018 Applications: 1) sensors 2) Thermometer 3) fashion fabrics that change colour with temperature 4) display devices
  17. 17. • Columnar (Discotic phase) Columnar (or discotic) liquid crystals are different from the previous types because they are shaped like discs instead of long rods. 17 Discotic phase 23-03-2018
  18. 18. 23-03-2018 18 Liquid Crystal • Having 3 Dimensional Order Smectic A • Having 0 Order • Translational & Rotational Motion Nematic • Diffuse Out of the Latice Like Structure • Layer like arrangement Isotropic • Having 0 Order as well • Liquid As Temperature Increases………
  19. 19. Applications 1923-03-2018
  20. 20. 20 1.Pharma drugs as Liquid crystals. Ex. a) Nafodixine HCL. b) Palmitolyl propranolol HCL. c) Itraconazole. 2.Liquid Crystals as a solubility enhancers. Ex. Fenoprofen Calcium • Pharmaceutical Application 23-03-2018
  21. 21. 21 3. Novel approach for topical drug deleivary For eg. Zaltoprofen (an NSAID) 4. Liquid Crystals in Cosmaceuticals 23-03-2018
  22. 22. 5. Liquid Crystal Thermometers 23-03-2018 22 • Liquid-crystal thermometers use liquid crystals that change color in response to temperature changes. • Numbers on the partitions indicate temperatures according to the amount of heat present.
  23. 23. •Flat screen television •Laptop screens •Switchable windows • Other Uses of Liquid Crystals 2323-03-2018
  24. 24. 24 • Digital Clocks • Digital Calculator 23-03-2018
  25. 25. 23-03-2018 25 Why DURACELL so much famous?
  26. 26. Conclusion Today, Thanks to the scientists Reinitzer, Lehmann and their followers, we know that literally thousands of substances have a diversity of other states. Some of them have been found very usable in several technical innovations, among which liquid crystal screens and liquid crystal thermometers may be the best known. The many applications of LCs in Pharma industries made many revolutions, which become very beneficial for the society. 2623-03-2018
  27. 27. Not yet……. But Might be ask in this year!!!! 23-03-2018 27
  28. 28. 28 •Reference 1. P. Gaikwad, Maya t. Desai. Liquid crystalline phase & its pharma applications international journal of pharma research & review, dec 2013; 2(12):40-52 2. Pande v., Nayak s., Kendre p., Patil p. And sagar k. Fabrication and characterization of zaltoprofen loaded Lyotropic liquid crystalline gel(received 20 august 2015) (accepted 20 november 2015) indian drugs 53 (03) march 2016 3.Theory of liquid crystals,http://www.springer.com/978-3-319-00857-8 4. Denis Andrienko, Introduction to liquid crystalsInternational Max Planck Research School Modelling of soft matter,11-15 September 2006, Bad Marienberg September 14, 2006 23-03-2018
  29. 29. 29 5. Theory of liquid crystals http://www.worldscientific.com 6. I. Tadwee, Dr.S. Shahi, V. Ramteke, I. Syed. Liquid Crystals Pharmaceutical Application: A Review; Volume 1, issue2 (2012), 06-11 7. A. P. Lodha, G. P. Jadhav and V. V. Pande . Liquid Crystals As A Cubo-Hexagonal Topical Controlled Drug Delivery System:Pharmacophore 2014, Vol. 5 (3), 430- 441 USA CODEN: PHARM7 ISSN 2229-5402 8.The Classification Of Liquid Crystal, http://photonicswiki.org/images. 9.Application of liquid Crystal http://saffron.pharmabiz.com/article/detnews.asp?articleid =48939&sectionid=46 23-03-2018
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