Role of Dipolar Interactions and Volume Particle Size Distribution on the Nonmonotonic Magnetic Field Dependence of the Blocking Temperature in Magnetic Nanoparticles

2015 ◽  
Vol 120 (1) ◽  
pp. 765-770 ◽  
Author(s):  
Sueli H. Masunaga ◽  
Renato F. Jardim ◽  
Marcos J. Correia ◽  
Wagner Figueiredo
Keyword(s):  
Magnetic Field ◽  
Particle Size ◽  
Magnetic Nanoparticles ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Blocking Temperature ◽  
Dipolar Interactions

Role of emulsifier on the particle size and polymer particle size distribution using multiwavelength spectroscopy measurements

2017 ◽  
Vol 38 (11) ◽  
pp. 1600-1606 ◽  
Author(s):  
María-Teresa Celis ◽  
Billmary Contreras ◽  
Patricia Rosenzweig Levy ◽  
Lucero Méndez ◽  
Francys Vejar ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Polymer Particle

The Role of Particle Size Distribution in the Performance and Modelling of Filtration

1993 ◽  
Vol 27 (10) ◽  
pp. 19-34 ◽  
Author(s):  
R. I. Mackie ◽  
R. Bai
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Fine Particles ◽  
Coarse Particles ◽  
Large Particles

The paper examines the importance of size distribution of the influent suspension on the performance of deep bed filters and its significance with regard to modelling. Experiments were carried out under a variety of conditions using suspensions which were identical in every respect apart from their size distribution. The results indicate that the presence of coarse particles does increase the removal of fine particles. Deposition of fine particles leads to a greater headloss than deposition of large particles. Changes in size distribution with time and depth play an important role in determining the behaviour of a filter, and models of both removal and headloss development must take account of this.

The Effect of Natural Soiling and Cleaning on the Size Distribution of Particles Deposited on Glass Mirrors

1980 ◽  
Vol 102 (4) ◽  
pp. 248-256 ◽  
Author(s):  
E. P. Roth ◽  
A. J. Anaya
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Diffuse Reflectance ◽  
Solar Spectrum ◽  
Outdoor Exposure ◽  
Size Distribution Function ◽  
Outdoor Environment ◽  
Size Distribution Of Particles

The particle size distribution and the reflectance properties of silvered glass mirrors exposed in an outdoor environment have been measured to determine the separate effects of natural soiling and natural cleaning (wind and rain). The wavelength dependent diffuse reflectance was correlated with the particle size distribution function for mirrors exposed to increasing periods of outdoor exposure. These measurements have indicated the significant role of small particles (radii ≲ 5 μm) in the soiling of exposed mirrors and in the subsequent reflectance loss over the solar spectrum.

Dipolar Interaction Effects in the Magnetic and Magnetotransport Properties of Ordered Nanoparticle Arrays

2008 ◽  
Vol 8 (6) ◽  
pp. 2929-2943 ◽  
Author(s):  
D. Kechrakos ◽  
K. N. Trohidou
Keyword(s):  
Magnetic Nanoparticles ◽  
Structural Parameters ◽  
Dipolar Interaction ◽  
Interaction Effects ◽  
Blocking Temperature ◽  
Dipolar Interactions ◽  
Interparticle Interactions ◽  
Ordered Arrays ◽  
Monte Carlo Studies

Assemblies of magnetic nanoparticles exhibit interesting physical properties arising from the competition of intraparticle dynamics and interparticle interactions. In ordered arrays of magnetic nanoparticles magnetostatic interparticle interactions introduce collective dynamics acting competitively to random anisotropy. Basic understanding, characterization and control of dipolar interaction effects in arrays of magnetic nanoparticles is an issue of central importance. To this end, numerical simulation techniques offer an indispensable tool. We report on Monte Carlo studies of the magnetic hysteresis and spin-dependent transport in thin films formed by ordered arrays of magnetic nanoparticles. Emphasis is given to the modifications of the single-particle behavior due to interparticle dipolar interactions as these arise in quantities of experimental interest, such as, the magnetization, the susceptibility and the magnetoresistance. We investigate the role of the structural parameters of an array (interparticle separation, number of stacked monolayers) and the role of the internal structure of the nanoparticles (single phase, core–shell). Dipolar interactions are responsible for anisotropic magnetic behavior between the in-plane and out-of-plane directions of the sample, which is reflected on the investigated magnetic properties (magnetization, transverse susceptibility and magnetoresistance) and the parameters of the array (remanent magnetization, coercive field, and blocking temperature). Our numerical results are compared to existing measurements on self-assembled arrays of Fe-based and Co nanoparticles is made.

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