Magnetophoresis behaviour at low gradient magnetic field and size control of nickel single core nanobeads

Benelmekki, Maria; Montràs, Anna; Martins, Artur J.; Coutinho, Paulo J. G.; Martínez, Laura Martínez

doi:10.1016/j.jmmm.2011.02.027

Cited by 17 publications

(21 citation statements)

References 18 publications

(20 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…54 This method is known as High Gradient Magnetic Separation (HGMS) and it is discussed in detail elsewhere. 10,12,[54][55][56][57] Another strategy is to employ homogeneous magnetophoretic conditions (a uniform gradient) 17,24,53,58,59 generated by a suitable arrangement of permanent magnets, which gives gradients of the order of 10-30 T m À1 . In this case, an enhancement of the magnetophoretic velocity has to come from an appropriate choice of the dispersion.…”

Section: Inhomogeneous Fields: Cooperative Magnetophoresismentioning

confidence: 99%

Understanding diluted dispersions of superparamagnetic particles under strong magnetic fields: a review of concepts, theory and simulations

2013

View full text Add to dashboard Cite

In recent years, there has been a great progress in the development of superparamagnetic particles targeted to a wide range of applications, including fields as diverse as biotechnology or waste removal. However, the physics behind their behaviour under usual conditions (diluted dispersions and high magnetic fields) has many, fundamental, open questions. In this review, we revisit the advances in the basic physical concepts and predictive analytical and simulation tools. We focus on recent developments in the understanding and prediction of phenomena induced by magnetic fields both in uniform fields (for example, chain formation) and in magnetic gradients (cooperative magnetophoresis).

show abstract

Section: Inhomogeneous Fields: Cooperative Magnetophoresismentioning

confidence: 99%

Understanding diluted dispersions of superparamagnetic particles under strong magnetic fields: a review of concepts, theory and simulations

2013

View full text Add to dashboard Cite

show abstract

“…We consider here the case of a radial magnetic gradient, as in the experiments reported in Refs. [12,23,24]. In these experiments, an initially homogeneous dispersion of magnetic particles is placed inside a cylindrical cavity (of radius L) containing a uniform magnetic gradient pointing toward the walls of the vessel.…”

Section: Theory Of Magnetophoresis Under Uniform Gradientmentioning

confidence: 99%

“…In all cases, our magnetophoretic separation experiments were performed using precision magnetophoresis systems from SEPMAG [33], the SEPMAG LAB 1 × 25 ml 2042 and 2042 plus (in both cases, L = 1.5 cm). The magnetophoresis kinetics is monitored by measuring the opacity of the sample, as in previous works [12,23,24] (we also describe again the full experimental methodology in the accompanying supplemental material). Here it suffices to say that the measured opacity (after appropriate normalization) provides a good estimate of the fraction f of particles remaining in solution.…”

Section: A Comparison Of Predictions With Experimentsmentioning

confidence: 99%

“…In previous works [12,[22][23][24] we have made use of a new concept of magnetic separation (so-called precision magnetophoresis) to effectively remove different types of superparamagnetic nanoparticles from solution. The key aspect here is that the separation process is based on the application of a homogeneous magnetic gradient to drive the removal of the particles, enhancing the control of the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simple analytical model for the magnetophoretic separation of superparamagnetic dispersions in a uniform magnetic gradient

et al. 2011

Self Cite

View full text Add to dashboard Cite

Magnetophoresis-the motion of magnetic particles under applied magnetic gradient-is a process of great interest in novel applications of magnetic nanoparticles and colloids. In general, there are two main different types of magnetophoresis processes: cooperative magnetophoresis (a fast process enhanced by particle-particle interactions) and noncooperative magnetophoresis (driven by the motion of individual particles in magnetic fields). In the case of noncooperative magnetophoresis, we have obtained a simple analytical solution which allows the prediction of the magnetophoresis kinetics from particle characterization data (size and magnetization). Our comparison with new experimental results shows good quantitative agreement. In addition, we show the existence of a universal curve onto which all experimental results should collapse after proper rescaling. The range of applicability of the analytical solution is discussed in light of the predictions of a magnetic aggregation model [Soft Matter 7, 2336].

show abstract

“…The work of Andreu et al 23 describes an apparatus for magnetic separation in detail and derives an analytical model for the separation procedure and the required separation times. The separation apparatus is composed of a radial magnetic gradient as used by De Las Cuevas et al and Benelmekki et al 24,25 A homogeneous dispersion of magnetic particles is placed inside a cylindrical cavity of radius L. A magnetic gradient field is imposed on the cavity with a uniform magnetic gradient pointing towards the walls of the vessel. The magnetic gradient enforces the particles to move radially towards the vessel wall, which is the final stage of the process, resulting in an inhomogeneous dispersion of particles.…”

Section: Navigation Characterization Using Separation Apparatusmentioning

confidence: 99%

Simultaneous Magnetic Particle Imaging and Navigation of large superparamagnetic nanoparticles in bifurcation flow experiments

Griese

Knopp

Gruettner³

et al. 2020

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

Magnetic Particle Imaging (MPI) has been successfully used to visualize the distribution of superparamagnetic nanoparticles within 3D volumes with high sensitivity in real time. Since the magnetic field topology of MPI scanners is well suited for applying magnetic forces on particles and micron-sized ferromagnetic devices, MPI has been recently used to navigate micron-sized particles and micron-sized swimmers. In this work, we analyze the magnetophoretic mobility and the imaging performance of two different particle types for Magnetic Particle Imaging/Navigation (MPIN). MPIN constantly switches between imaging and magnetic modes, enabling quasi-simultaneous navigation and imaging of particles. We determine the limiting flow velocity to be 8.18 mL s −1 using a flow bifurcation experiment, that allows all particles to flow only through one branch of the bifurcation. Furthermore, we have succeeded in navigating the particles through the branch of a bifurcation phantom narrowed by either 60% or 100% stenosis, while imaging their accumulation on the stenosis. The particles in combination with therapeutic substances have a high potential for targeted drug delivery and could help to reduce the dose and improve the efficacy of the drug, e.g. for specific tumor therapy and ischemic stroke therapy. 4/17

show abstract

Magnetophoresis behaviour at low gradient magnetic field and size control of nickel single core nanobeads

Cited by 17 publications

References 18 publications

Understanding diluted dispersions of superparamagnetic particles under strong magnetic fields: a review of concepts, theory and simulations

Understanding diluted dispersions of superparamagnetic particles under strong magnetic fields: a review of concepts, theory and simulations

Simple analytical model for the magnetophoretic separation of superparamagnetic dispersions in a uniform magnetic gradient

Simultaneous Magnetic Particle Imaging and Navigation of large superparamagnetic nanoparticles in bifurcation flow experiments

Contact Info

Product

Resources

About