Journal ArticleDOI
Pair correlations in a ferromagnetic colloid
P. G. de Gennes,Philip Pincus +1 more
- Vol. 11, Iss: 3, pp 189-198
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In this article, the authors discuss the properties of the equation of state and the static correlations for spherical ferromagnetic grains, at thermal equilibrium, in a passive fluid, at high external fields, low concentrations, and not too high temperatures, the grains tend to formchains along the directions ofH.Abstract:
We discuss some properties of the equation of state and of the static correlations for spherical ferromagnetic grains, at thermal equilibrium, in a passive fluid. At high external fieldsH, low concentrations, and not too high temperatures, the grains tend to formchains along the directions ofH. In zero field (but otherwise identical conditions), some chains are still present but oriented at random and in competition with closed rings and clusters. Various experimental methods which could give information on these chain structures are listed.read more
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Aggregation and Sedimentation of Aqueous Nanoscale Zerovalent Iron Dispersions
TL;DR: Investigation of the rapid aggregation of NZVI from single nanoparticles to micrometer size aggregates, and optical microscopy and sedimentation measurements to estimate the size of interconnected fractal aggregates formed confirm that magnetic attractive forces between particles increase the rate ofNZVI aggregation as compared to nonmagnetic particles.
Journal ArticleDOI
Patterns and collective behavior in granular media: Theoretical concepts
Igor S. Aranson,Lev S. Tsimring +1 more
TL;DR: In this paper, the authors survey a number of situations in which nontrivial patterns emerge in granular systems, elucidates important distinctions between these phenomena and similar ones occurring in continuum fluids, and describes general principles and models of pattern formation in complex systems that have been successfully applied to granular system.
Journal ArticleDOI
Direct observation of dipolar chains in iron ferrofluids by cryogenic electron microscopy
TL;DR: In situ linear dipolar structures in ferrofluids in zero field are shown, visualized on the particle level by electron cryo-microscopy on thin, vitrified films of organic dispersions of monodisperse metallic iron particles, showing that the experimental model used is well suited to study the structural properties of dipolar particle systems.
Journal ArticleDOI
Reconfiguring active particles by electrostatic imbalance
TL;DR: A general strategy to reconfigure active particles into various collective states by introducing imbalanced interactions is presented, and this strategy of asymmetry-driven active self-organization should generalize rationally to other active 2D and three-dimensional materials.
References
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Journal ArticleDOI
Theory of Dipole Interaction in Crystals
J. M. Luttinger,Laszlo Tisza +1 more
TL;DR: In this article, it was shown that dipole arrays may be represented as vectors in a many-dimensional vector space and the classical dipole interaction energy is a quadratic form in the components of the dipole moments.
Journal ArticleDOI
An Approach to Elongated Fine-Particle Magnets
I. S. Jacobs,C. P. Bean +1 more
TL;DR: In this paper, the coercive force predicted by theory for single-domain particles with shape anisotropy frequently far exceeds the observed value, and several approximate models are suggested which may exist in certain experimental situations.
Journal ArticleDOI
Nonmechanical Torque-Driven Flow of a Ferromagnetic Fluid by AN Electromagnetic Field
R. Moskowitz,R. E. Rosensweig +1 more
TL;DR: In this article, it is shown that very high rotation rates are possible by coupling to the suspended single-domain particles with a rotating magnetic field, and a ferromagnetic pump based on the present principle could be of great value in fluidic systems and open up new applications in space, ocean, biological and other environments.