Journal ArticleDOI
Magnetic transient birefringence of ferrofluids: particle size determination
Reads0
Chats0
TLDR
In this article, the hydrodynamic diameter of particles deduced from experiments is compared to a numerical computation with a log-normal distribution for a narrow distribution (σ ≃ 0.25).Abstract:
Relaxation time measurements of magnetically induced birefringence of ferrofluid solutions are performed with samples of various polydispersities. d H, the hydrodynamic diameter of particles deduced from experiments, is compared to a numerical computation with a log-normal distribution. Dynamic magnetic birefringence appears to be a good test of the tail of the sample size distribution. For a narrow distribution (σ ≃ 0.25), the experiment is in good agreement with the model: dH is two times larger than the most probable diameter and corresponds to the largest particles in the sample.read more
Citations
More filters
Journal ArticleDOI
Ionic ferrofluids: A crossing of chemistry and physics
TL;DR: In this article, a phase diagram is built up as a function of ionic strength and preliminary results on the magnetic-field-induced phase separation are given, where Colloidal stability is considered with respect to various particle interaction parameters.
Journal ArticleDOI
Ferrosmectics: A new magnetic and mesomorphic phase.
TL;DR: Observation de the texture and de l'effet d'un champ magnetique dans un lyotrope lamellaire.
Journal ArticleDOI
Phase diagram of an ionic magnetic colloid: Experimental study of the effect of ionic strength
TL;DR: In this article, the phase separation in zero magnetic field of an ionic ferrofluid is experimentally studied as a function of the ionic strength of the solution, and a reduced phase diagram is built up.
Book ChapterDOI
Synthesis and mangeitc properties of managanese and cobalt ferrite ferrite ferrofluids
TL;DR: In this article, aqueous sols of MnFe2O4 and CoFe 2O4 particles are presented, and the chemical synthesis of these ionic ferrofluids is performed in two steps: (1) coprecipitation of chemically stable fine grains; (2) ionic stabilization of these grains to get stable colloidal ionic solutions.
Journal ArticleDOI
Binding of biological effectors on magnetic nanoparticles measured by a magnetically induced transient birefringence experiment.
Claire Wilhelm,Florence Gazeau,Jacky Roger,Jean-Noel Pons,M. F. Salis,Régine Perzynski,Jean-Claude Bacri +6 more
TL;DR: The relaxation of the magnetically induced birefringence in a suspension of magnetic nanoparticles is investigated in order to detect the binding reaction of polyclonal antibodies on the particle surface and the graft of an antibody on particle and eventually the onset of particles aggregation.
References
More filters
Journal ArticleDOI
Preparation of aqueous magnetic liquids in alkaline and acidic media
TL;DR: In this article, the results of work on the preparation of aqueous magnetic liquids without using organic stabilizing agents are presented, and the results are compared to those of the same authors.
Journal ArticleDOI
Ultrafine metal particles
TL;DR: In this paper, a statistical growth model based on the Central Limit Theorem has been formulated for liquid-like coalescence of particles; this theory accounts satisfactorily for all the data, as well as for most size distributions published in the literature.
Journal ArticleDOI
Measurements of particle size distribution parameters in ferrofluids
TL;DR: In this article, a method is presented by means of which (for a ferrofluid with a lognormal distribution of particle size) it is possible to determine the standard deviation and median particle diameter (D v ) from the room temperature magnetisation curve.
Journal ArticleDOI
Magnetic colloidal properties of ionic ferrofluids
TL;DR: In this paper, the magnetic properties of colloidal suspensions of γ-Fe 2 O 3 particles, obtained through a chemical synthesis, are investigated using an optical technique, and it is verified that these ionic aqueous ferrofluids are stable in high fields.