Loading...

Evaluation of Effective Parameters in Trapping Aerosols and Examination of Possibility of Detecting Distortions of Microdroplets by Means of Optical Tweezer

Khajeh, Ahmad | 2015

0 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57031 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Seyed Reihani, Nader
  7. Abstract:
  8. Optical tweezer is a highly focused laser beam that could be used to trap micro and nano particles in three dimensions. It could be used to measure(or apply) piconewton range forces. Most of the optical tweezers experiments have been done in liquid mediums. In last few years, trapping particles which are floating in gas mediums(called aerosols) have been considered extensively. In this thesis, the changes in trap stiffness and conversion factor due to changes in laser power, trapping depth and particle are evaluated. It is shown that changing these three parameters, cause considerable changes in trap stiffnes and conversion factor. Linear behavior of trap stiffness versus laser power, confirmed that the particle is trapped in the direction of laser beam with a spring-like force. With evaluation of the behavior of the trap stiffness versus trapping depth it is seen that for each system, there is an optimum depth depending on particle size. Trapping different liquid aerosols with diverse physical and chemical properties, provides profitable information about different liquids. In studies related to this area, lots of liquid features like surface tension and viscousity, are measured by examination of changes in shape of a micro-droplet.In this thesis,it is shown that we can detect these changes by means of optical tweezer
  9. Keywords:
  10. Optical Tweezer ; Aerosols ; Microdroplets ; Optical Trapping ; Surface Tension

 Digital Object List

 Bookmark

No TOC