Investigating nanoparticle aggregation dynamics in an aqueous magnetic fluid by light scattering anisotropy

Light scattering on particles having the diameter comparable with the wavelength is accurately described by the Mie theory and the light scattering anisotropy can conveniently be described by the one parameter Henyey Greenstein phase function. An aqueous suspension containing magnetite nanoparticles was the target of a coherent light scattering experiment. By fitting the scattering phase function on the experimental data the scattering anisotropy parameter can be assessed. As the scattering parameter strongly depends of the scatterer size, the average particle diameter was thus estimated and particle aggregates presence was probed. This technique was used to investigate the nanoparticle aggregation dynamics and the results are presented in this work.

[1]  W. Roetzel,et al.  Conceptions for heat transfer correlation of nanofluids , 2000 .

[2]  J. Briers,et al.  Laser Doppler, speckle and related techniques for blood perfusion mapping and imaging. , 2001, Physiological measurement.

[3]  A. Wei,et al.  Off-Axis Electron Holography of Self-Assembled Co Nanoparticle Rings , 2007 .

[4]  D. Schweitzer,et al.  A scattering phase function for blood with physiological haematocrit , 2001, Physics in medicine and biology.

[5]  G. Ozin,et al.  Ordered 2D arrays of ferromagnetic Fe/Co nanoparticle rings from a highly metallized metallopolymer precursor , 2004 .

[6]  J. Fish,et al.  Role of Brownian motion hydrodynamics on nanofluid thermal conductivity , 2006 .

[7]  Igor E. Jahatspanian,et al.  A new method for studying platelets, based upon the low-angle light scattering technique. 1. Theoretical and experimental foundations of the method , 2005 .

[8]  Peter Vadasz,et al.  Heat Conduction in Nanofluid Suspensions , 2006 .

[9]  D. Chicea.  Speckle size, intensity and contrast measurement application in micron-size particle concentration assessment , 2007 .

[10]  Stephen U. S. Choi,et al.  Role of Brownian motion in the enhanced thermal conductivity of nanofluids , 2004 .

[11]  Norman J. McCormick,et al.  Approximate two-parameter phase function for light scattering , 1980 .

[12]  Direct observation of dipolar chains in ferrofluids in zero field using cryogenic electron microscopy , 2003 .

[13]  G. Born.  Observations on the change in shape of blood platelets brought about by adenosine diphosphate , 1970, The Journal of physiology.

[14]  W. Steen.  Absorption and Scattering of Light by Small Particles , 1999 .

[15]  M. Giglio,et al.  Near-field intensity correlations of scattered light. , 2001, Applied optics.

[16]  M. Murata,et al.  Characterization of liposomes carrying von Willebrand factor-binding domain of platelet glycoprotein Ibalpha: a potential substitute for platelet transfusion. , 1999, Biochemical and biophysical research communications.

[17]  E. Thamm,et al.  Single scattering by red blood cells. , 1998, Applied optics.

[18]  Zhongdang Xiao,et al.  Formation of robust mesoscopic ring structures by self-assembly of SiCl3-terminated dendrimers , 2001 .

[19]  Stephen U. S. Choi.  Enhancing thermal conductivity of fluids with nano-particles , 1995 .

[20]  J Cariou,et al.  Scattering through fluids: speckle size measurement and Monte Carlo simulations close to and into the multiple scattering. , 2004, Optics express.

[21]  J. Cariou,et al.  Particle aggregation monitoring by speckle size measurement; application to blood platelets aggregation. , 2004, Optics express.

[22]  R. Prasher,et al.  Thermal conductivity of nanoscale colloidal solutions (nanofluids). , 2005, Physical review letters.

[23]  R. Jenkins,et al.  A new method for studying platelets, based upon the low-angle light scattering technique. 2. Application of the method in experimental toxicology and clinical pathology. , 2005 .