Short-range magnetic order in two-dimensional cobalt-ferrite nanoparticle assemblies (2008)
Georgescu, M, Viota, J.L., Klokkenburg, Mark, Erné, B.H., Vanmaekelbergh, D., Zeijlmans Van Emmichoven, P.A.
Magnetic order in two-dimensional islands of spherical 21 nm cobalt-ferrite (CoFe2O4) nanoparticles is studied by magnetic force microscopy and spectroscopy. Images obtained at a temperature of 105 K...
Ruppert, A.M., Meeldijk, J.D., Kuipers, B.W.M., Erné, B.H., Weckhuysen, B.M.
Glycerol is an attractive renewable building block for the synthesis of di- and triglycerols, which have numerous applications in the cosmetic and pharmaceutical industries. In this work, the...
Wiedenmann, A., Keiderling, U., Meissner, M., Wallacher, D., Gähler, R., May, R.P., ...
The dynamics of ordering and relaxation processes in magnetic colloids has been studied by means of stroboscopic small angle neutron scattering techniques in an oscillating magnetic field. Surfactant...
Magnetization behavior of ferrofluids with cryogenically imaged dipolar chains (2008)
Klokkenburg, Mark, Erné, B.H., Mendelev, V., Ivanov, A.O.
Theories and simulations have demonstrated that field-induced dipolar chains affect the static magnetic properties of ferrofluids. Experimental verification, however, has been complicated by the high...
Complex magnetic susceptibility setup for spectroscopy in the extremely low-frequency range (2008)
Kuipers, B.W.M., Bakelaar, I.A., Klokkenburg, Mark, Erné, B.H.
A sensitive balanced differential transformer was built to measure complex initial parallel magnetic susceptibility spectra in the 0.01–1000 Hz range. The alternating magnetic field can be chosen...
Klokkenburg, Mark, Hilhorst, J., Erné, B.H.
The surface of magnetite (Fe3O4, d = 6:3 ± 0:7 nm) nanoparticles dispersed in cyclohexane was studied in the presence of oleic acid and oleylamine using in situ FTIR spectroscopy. Equimolar mixtures...
Measurement of the zero-field magnetic dipole moment of magnetizable colloidal silica spheres (2007)
Claesson, E.M., Erné, B.H., Bakelaar, I.A., Kuipers, B.W.M., Philipse, A.P.
The magnetic properties of dispersions of magnetic silica microspheres have been investigated by measuring the magnetization curves and the complex magnetic susceptibility as a function of frequency...
Erné, B.H., Claesson, E.M., Sacanna, S., Klokkenburg, Mark, Bakelaar, I.A., Kuipers, B.W.M.
A procedure is presented to determine the permanent magnetic dipole moment of composite microspheres containing magnetic nanoparticles with a blocked magnetic dipole moment. The composite particles...
Klokkenburg, Mark, Erné, B.H., Wiedenmann, A., Petukhov, A.V., Philipse, A.P.
Field-induced structure formation in a ferrofluid with well-defined magnetite nanoparticles with a permanent magnetic dipole moment was studied with small-angle neutron scattering (SANS) as a...
Claesson, E.M., Erné, B.H., Philipse, A.P.
The weak permanent magnetic dipole moment of cobalt ferrite-doped colloidal silica spheres was increased by exposure to a saturating magnetic field. The resulting change of the rotational dynamics of...
Dipolar structures in colloidal dispersions of PbSe and CdSe quantum dots (2007)
Klokkenburg, Mark, Houtepen, A.J., Koole, R., Erné, B.H., ...
We show by cryogenic transmission electron microscopy that PbSe and CdSe nanocrystals of various shapes in a liquid colloidal dispersion self-assemble into equilibrium structures that have a...
Quantitative Real-Space analysis of self-assembled structures of magnetic dipolar colloids (2006)
Klokkenburg, Mark, Dullens, R.P.A., Kegel, W.K., Erné, B.H., Philipse, A.P.
Comparison of reversible and irreversible dipolar assemblies in a ferrofluid (2006)
Zero-field aggregation of magnetic nanoparticles in a ferrofluid can either be irreversible or result from a dynamic equilibrium; the two cases can be distinguished by measurements of the complex...
In situ imaging of Field-induced hexagonal columns in magnetite ferrofluids (2006)
Klokkenburg, Mark, Erné, B.H., Meeldijk, J.D., Wiedenmann, A., Petukhov, A.V., Dullens, R.P.A., ...
Flux closure in two-dimensional magnetite nanoparticle assemblies (2006)
Georgescu Costache, M., Klokkenburg, Mark, Erné, B.H., Liljeroth, P.W., Vanmaekelbergh, D.A.M., Zeijlmans Van Emmichoven, P.A.
Magnetic force microscopy and spectroscopy are used to study two-dimensional islands of spherical 21- nm magnetite nanoparticles. The observed repulsion of the magnetic tip at the edges of the...