Suman Anand

Publications (9) View all

• Article: Observation of the binary coalescence and equilibration of micrometer-sized droplets of aqueous aerosol in a single-beam gradient-force optical trap.

  R Power, J P Reid, S Anand, D McGloin, A Almohamedi, N S Mistry, A J Hudson
  [show abstract] [hide abstract]
  ABSTRACT: The binary coalescence of aqueous droplets has been observed in a single-beam gradient-force optical trap. By measuring the time-dependent intensity for elastic scattering of light from the trapping laser, the dynamics of binary coalescence have been examined and the time scale for equilibration of a composite droplet to ambient conditions has been determined. These data are required for modeling the agglomeration of aqueous droplets in dense sprays and atmospheric aerosol. Elastic-light scattering from optically trapped particles has not been used previously to study the time-resolved dynamics of mixing. It is shown to offer a unique opportunity to characterize the binary coalescence of aqueous droplets with radii from 1 to 6 μm. The study of this size regime, which cannot be achieved by conventional imaging methods, is critical for understanding the interactions of droplets in the environment of dense sprays.
  The Journal of Physical Chemistry A 08/2012; 116(35):8873-84. · 2.95 Impact Factor
• Source

  Available from: Suman Anand

  Article: Formation and characterization of Y : 247 film through spray pyrolysis technique

  Suman Anand, O. N. Srivastava
  [show abstract] [hide abstract]
  ABSTRACT: The synthesis of high temperature superconducting films of Y : 247 (T c ∼ 73 K) have been successfully achieved. The difficulty in synthesis owing to narrow range of stability of Y : 247 has been taken care of through several quenching modes, e.g. quenching of the films synthesized at ∼850°C, in air or in liquid nitrogen. The energy dispersive analysis of X-rays (EDAX) and transmission electron microscopy (TEM) studies of the as processed film, Y2Ba4Cu7O14+x, exhibit nearly correct cationic stoichiometry of 2 :4 :7; also narrow regions (< 50 Å) of minority Y : 124 phase and stacking faults capable of working as flux pinning sites have been invariably found to be present. In addition to Y : 247, Ag admixed films have also been investigated. TheT c here is ∼ 70–75 K which is similar to that of the film without silver. Representative estimates of transport critical current density (J c) for Y : 247 films is ∼103 A/cm2, and with silver corresponding to Y2Ba4Cu7O14+x (Ag0.1) is found to be ∼ 104 A/cm2.
  Bulletin of Materials Science 04/2012; 27(2):113-119. · 0.88 Impact Factor
• Article: Optically written optofluidic ice channels

  S. Anand, A. Engelbrecht, D. McGloin
  J of Optics. 01/2011; 13:044005.
• Article: Optical manipulation of airborne particles: techniques and applications.

  David McGloin, Daniel R Burnham, Michael D Summers, Daniel Rudd, Neil Dewar, Suman Anand
  [show abstract] [hide abstract]
  ABSTRACT: In the following paper, we discuss new methods to trap and manipulate airborne liquid aerosol droplets. We discuss the single gradient force trapping of water aerosols in the 2-14 micron diameter range using both 532 nm and 1064 nm light, as well as the holographic optical trapping of arrays of aerosols. Using this holographic technique, we are able to show controlled aerosol coagulation. We also discuss two techniques based on the radiation pressure trapping of aerosols, namely the dual beam fibre trap and the controlled guiding of aerosols using Bessel beams. We conclude with a discussion of new topics for study based upon these techniques and some possible applications.
  Faraday Discussions 02/2008; 137:335-50; discussion 403-24. · 5.00 Impact Factor
• Article: Experimental study of spectral anomalies in a Fraunhofer diffraction pattern

  Suman Anand, H C Kandpal
  [show abstract] [hide abstract]
  ABSTRACT: Experimental results of a study, conducted to investigate spectral changes that take place in the vicinity of the dark Airy rings formed by diffraction of spatially coherent, polychromatic light in the far zone of an aperture, are reported. These results are consistent with theoretical work (Ponomarenko and Wolf 2002 Opt. Lett.14 1211).
  Journal of Optics A Pure and Applied Optics 11/2003; 6(2):177. · 1.92 Impact Factor