Nano technology

Nanoparticle generation via spark discharger
i. Silver nanoparticle : antimicrobial agent.
ii. Nanoparticle coating for anti-microbial air filter
  • The Leviviridae family (linear (+)ssRNA, encodes four genes)
  • Host bacterium: Escherichia coli C3000
  • Diameter: 275 Å (27.5nm)
  • Safe for handling, similar in physical and resistance characteristics as human pathogenic viruses
  • Plaque Forming Unit (PFU) analysis
Electrohydrodynamic (EHD) Technology
i. Electrospinning
  • Electrospinningis a novel process of producing fibers that consist of good physical properties.
  • Electrospinningis a method for obtaining nanofiber (100nm to 800nm), and a jet is ejected from a charged polymer solution when the applied electric field strength overcomes the surface tension of the solution.
  • The ejected jet then travels rapidly to the target collector located at some distance from the charged polymer solution under the influence of the electric field and becomes a solid polymer filament as the jet dries. This electrospinning process is used to get nano fibrous web which is high filtration efficiency.
ii. EHD jet printing
  • Electrohydrodynamic (EHD) jet printing has beenproposed as viable non-contact printing technique.
  • EHD jet printing is a method for obtaining fine patterns with diameters ranging from nanometres to micrometers, which uses a fine jet generated at the apex of liquid meniscus in electrospray.
  • Generally, the diameter of the jet is much smaller than the nozzle diameter. Therefore, the EHD jet printing enables to obtain highresolutionpatterns without miniaturizing the nozzle.
Aerosol agglomeration
  • Objective :to increase particle size of fine/ultrafine particles for high efficiency electrostatic precipitation or filtration.
  • Particle grows by colliding each other (agglomeration).
  • To increase the number of particle collision, disturbance was applied to particle path (AC electric field, ultrasonic wave).
i. Electrical agglomeration
  • Bipolar charged particles were exposed to AC electric field to increase probability of collision between particles.
ii. Acoustic agglomeration
  • Ultrasonic waves were applied to particle path to increase probability of collisionbetween
iii. Experimental result
  • Particle concentration decreased, and the particle size increased.
    → Particle was agglomerated.