Investigation of magnetic active core sizes and hydrodynamic diameters of a magnetically fractionated ferrofluid

Büttner, M.; Weber, P.; Schmidl, F.; Seidel, P.; Röder, Michael; Schnabelrauch, Matthias; Wagner, Kerstin; Görnert, P.; Glöckl, Gunnar

doi:10.1007/s11051-010-0015-2

Cited by 8 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 4 shows the comparison of the simulated energy barrier distribution over the course of temperature (bars) and the experimental obtained distribution (curves) for the fractions of sample V190 and DDM 128N. The experimental obtained energy barrier distributions are taken from [10] for sample V190 und from [8] for sample DDM 128N. As we see we are able to reconstruct the complete energy barrier distribution by only using average values of the (reduced) anisotropy constant and the average particle volume.…”

Section: Simulation Results and Discussionmentioning

confidence: 92%

“…To obtain more reliable data we only use the fractionated samples but not the inititial solutions for our investigations. The magnetic data that is necessary for the simulation and the experimental obtained energy barrier distributions are taken from [10] for sample V190 und from [8] for sample DDM 128N.…”

Section: Methodsmentioning

confidence: 99%

“…The missing connective link was the comparison between the results of a concrete simulation of the energy barriers using the real particle parameters and the experimental obtained results. In this work we compare previously published experimentally measured energy barrier distributions over the course of temperature [8,10] with the calculated energy barrier distributions. For this comparison we use two varying ferrofluids that were magnetically fractionated to obtain smaller distribution of energy barriers and magnetically active core sizes, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…In a first step measurements between room temperature and liquid nitrogen temperature were realised [7] and in a second step the temperature range were expanded down to liquid helium temperature [8]. With this measurement set-up a lot of interesting measurements were done [9,10]. The missing connective link was the comparison between the results of a concrete simulation of the energy barriers using the real particle parameters and the experimental obtained results.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Simulation of energy barrier distributions using real particle parameters and comparison with experimental obtained results

Büttner

Schiffler

Weber

et al. 2013

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

In this work we compare previously measured energy barriers over the course of temperature with the results of simulations of the behaviour of the energy barriers. For the measurements the temperature dependent magnetorelaxation method (TMRX) was used. For the simulations of the energy barrier distribution we have used the real particles properties such as anisotropy and core size volume of the fractions of two magnetically fractionated ferrofluids. There is a good agreement between the simulated behaviour and the experimental obtained results. The influence of the particle volume concentration and agglomeration on the energy barrier distribution has been investigated. Finally the simulations confirm a previously published explanation for an experimentally obtained relaxation effect.

show abstract

Section: Simulation Results and Discussionmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of energy barrier distributions using real particle parameters and comparison with experimental obtained results

Büttner

Schiffler

Weber

et al. 2013

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

show abstract

“…Magneto-optical methods are sensitive to changes in the Brownian relaxation time of magnetic particle suspensions, and, consequently, have been applied to study hydrodynamic particle diameter distributions [ 260 ] or medium viscosities [ 261 ]. A typical setup, as it is employed to magneto-optically (Cotton-Mouton effect) measure the relaxation of the magnetization of a particle ensemble after an externally applied uniaxial magnetizing field is turned off (MRX mode), is sketched in Figure 16 a [ 262 ].…”

Section: Optical Detection Methodsmentioning

confidence: 99%

Homogeneous Biosensing Based on Magnetic Particle Labels

Schrittwieser

Pelaz

Parak

et al. 2016

Sensors

View full text Add to dashboard Cite

The growing availability of biomarker panels for molecular diagnostics is leading to an increasing need for fast and sensitive biosensing technologies that are applicable to point-of-care testing. In that regard, homogeneous measurement principles are especially relevant as they usually do not require extensive sample preparation procedures, thus reducing the total analysis time and maximizing ease-of-use. In this review, we focus on homogeneous biosensors for the in vitro detection of biomarkers. Within this broad range of biosensors, we concentrate on methods that apply magnetic particle labels. The advantage of such methods lies in the added possibility to manipulate the particle labels by applied magnetic fields, which can be exploited, for example, to decrease incubation times or to enhance the signal-to-noise-ratio of the measurement signal by applying frequency-selective detection. In our review, we discriminate the corresponding methods based on the nature of the acquired measurement signal, which can either be based on magnetic or optical detection. The underlying measurement principles of the different techniques are discussed, and biosensing examples for all techniques are reported, thereby demonstrating the broad applicability of homogeneous in vitro biosensing based on magnetic particle label actuation.

show abstract

Magnetic properties of multicore magnetite nanoparticles prepared by glass crystallisation

et al. 2012

View full text Add to dashboard Cite

Investigation of magnetic active core sizes and hydrodynamic diameters of a magnetically fractionated ferrofluid

Cited by 8 publications

References 22 publications

Simulation of energy barrier distributions using real particle parameters and comparison with experimental obtained results

Simulation of energy barrier distributions using real particle parameters and comparison with experimental obtained results

Homogeneous Biosensing Based on Magnetic Particle Labels

Magnetic properties of multicore magnetite nanoparticles prepared by glass crystallisation

Contact Info

Product

Resources

About