Se ha denunciado esta presentación.
Utilizamos tu perfil de LinkedIn y tus datos de actividad para personalizar los anuncios y mostrarte publicidad más relevante. Puedes cambiar tus preferencias de publicidad en cualquier momento.

Ultrasonic Technology Application

2.361 visualizaciones

Publicado el

Ultrasonication technology and its application in research and industry

Publicado en: Tecnología
  • Sé el primero en comentar

Ultrasonic Technology Application

  1. 1. ULTRASOUND TECHNOLOGY
  2. 2. ULTRASOUND • Ultrasound • is sound with a frequency greater than the upper limit of human hearing • Approximately > 18 kilohertz (18,000 hertz)
  3. 3. ULTRASOUND Applications Application Frequency (KHz) Intensity Cleaning 20- 40 Low Medical Imaging 250-2000 Very Low Laboratory 20-100 Medium Industrial 20-30 High
  4. 4. Ultrasound Cleaning Applications • Often used for cleaning of • Jewellery • Lenses and other optical parts • Coins • Watches • Dental instrument • surgical instruments • Fountain pens • Industrial parts • electronic equipment.
  5. 5. Ultrasound Cleaning Applications • Used in the • Automotive • Sporting • Printing • Marine • Medical • Pharmaceutical • Electroplating • Engineering industries.
  6. 6. Medical Imaging • Used to visualize the • Fetus • muscles • tendons • internal organs • For their • Size • Structure • any pathological lesions. • Obstetric sonography is commonly used during pregnancy. • Frequency Range 250-2000 KHz
  7. 7. • In area of • Biology • Molecular Biology • Biochemistry • Biotechnology • Pharmaceutical • Used for • Cell disruption • Homogenizing samples. • Dispersion & De-agglomeration • Reduction of primary particle to micron & sub-micron range Laboratory Application
  8. 8. • Dispersion • Even distribution of fine particles in a medium (Stable or unstable) Eg. Fumed silica Powder or Carbon Black. • De-agglomeration • Breaking up of agglomerates is called de-agglomeration • An increase in available surface area can result in the increase of the reactivity of reagents and catalysts. • The ultrasonic breakup of the agglomerate structures in aqueous and non-aqueous suspensions allows to utilize the full potential of such materials. Laboratory Application
  9. 9. • Cell Disruption ( Lysis) • Breaking up of cell walls for Isolation of DNA, RNA or proteins. Eg. Muscle tissue, liver tissue or lymphocyte, separation of virus from Bacteria • Other Methods used • Bead mill • Cells are agitated in suspension with small abrasive particles. Cells break because of shear forces, grinding between beads, and collisions with beads. • High Pressure Homogenizers • pumping of a slurry through a restricted orifice valve. They use high pressure (up to 1500 bar) followed by an instant expansion through a special exiting nozzle Laboratory Application
  10. 10. • Peizo Electric Effect • Piezoelectricity is based on the ability of certain crystals to emit an electrical charge when mechanically loaded with pressure or tension • Conversely, these crystals undergo a controlled deformation when exposed to an electric field – a behavior referred to as the inverse piezo effect. • Peizo Ceramic Components are used in converting Electrical energy to Mechanical movement or oscillations. • The oscillations are transferred by mechanical means to a sonotrode which is made to resonate. . Laboratory Application
  11. 11. Industrial Applications The powerful industrial processors enables to treat liquid media on production scale. • Dispersing and mixing • in resins • Paint • Ink • color pigments • Coatings e.g. fumed silica powder or carbon black • Emulsifying • e.g. discontinuous phases •from single or multiple feed • Fuel • Oil • Wax e.g. silicone oil
  12. 12. Industrial Applications • de-agglomerating and de-flocculation • nano-particles •catalysts •chemicals •pharmaceuticals • Homogenizing • elimination of settling • Wetting (e.g. of colloidial silica) • particle size reduction/milling •e.g to sub-micron ( nano) range • de-aeration and degassing
  13. 13. Industrial Applications • Sonochemistry is the application of ultrasound to chemical reactions and processes realting to •increase in reaction speed •increase in reaction output •more efficient energy usage •switching of reaction pathway •performance improvement of phase transfer catalysts •avoidance of phase transfer catalysts •use of crude or technical reagents •activation of metals and solids •increase in the reactivity of reagents or catalysts
  14. 14. Industrial Applications •Nano sizing •Nano materials are used in manufacture of sunscreens, electrically conductive coatings, and strong, lightweight plastic composites. •Nano materials fall into three broad categories: metal oxides, nanoclays, and carbon nanotubes. •The goal of most powder-based processing has been smaller size and improving the uniformity of particles. •Particles of sub-micron sizes - so called nano particles - are now critical to advancements in numerous applications.
  15. 15. Industrial Applications • Food Processing • ultrasonic extraction of phenolic compounds from vacuolar structures by disrupting plant tissue • ultrasonic extraction of Betacyanin (red pigments, e.g. from beets) and Betaxanthin (yellow pigments) • ultrasonic extraction of lipids and proteins from plant seeds, such as soybean (e.g. flour) • ultrasonic improvement of oil extraction from oil seeds • cell membrane permeabilization of fruits, such as grapes, plums, mango
  16. 16. • Food Processing • ultrasonic processing of • fruit juices, e.g. orange, grapefruit, mango, grape, plum • purees • sauces, e.g. tomato, asparagus, bell pepper, mushroom • dairy products • improve stability of dispersions, such as orange juice, i.e. reduce settling Industrial Applications
  17. 17. • Paper Industry • Ultrasound can be used in manufacturing paper and in paper recycling processes for: • preventing watermarks or lines that would reduce the paper quality, by degassing the pulp • enhancing the fibrillation of the pulp fibres • replacement and/or enhancement of beating and/or refining stages • using less energy than conventional beating processes • fibre strength is maintained and chemical reactions (such as TDF bleaching) are assisted Industrial Applications
  18. 18. • enhancing the breakdown of wood chip into pulp or for the breakdown of used paper into pulp for reprocessing into recycled paper •extracting of dirt, oil, printed inks (de-inking), colorants, or lacquer from paper during the process of recycling (fibre cleaning) •Dewatering •reduction of microbes in whitewater •spaying liquids onto the manufactured paper (such as coating) •homogenizing or dispersing of paper slurries Industrial Applications
  19. 19. • Generator • Generates electrical oscillations of ultrasonic frequency (e.g. above 20kHz) • Transducer • Electro-mechanical component, that converts electrical oscillations into mechanical vibrations. • The electrical oscillations are generated by the generator. The mechanical vibrations are transmitted to the sonotrode • Sonotrode • Mechanical component, that transmits the ultrasonic vibrations from the transducer to the material to be sonified. • It has to be mounted really tightly to avoid frictions and losses Working principle of Sonicators.
  20. 20. Thank you Courtesy: Hielscher Ultrasonics GmbH

×