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...
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...
Dipolar structures in colloidal magnetite dispersions (2007)
Dipolar structures in liquid colloidal dispersions comprising well-defined magnetite (Fe3O4) nanoparticles with a permanent magnetic dipole moment are analyzed on a single-particle level by in situ...
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...
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...
Charge regulation as a stabilization mechanism for shell-like assemblies of polyoxometalates (2007)
Verhoeff, A.A., Kistler, M.L., Bhatt, A., Pigga, J., Groenewold, J., Klokkenburg, Mark, ...
We show that the equilibrium size of single-layer shells composed of polyoxometalate macroions is inversely proportional to the dielectric constant of the medium in which they are dispersed. This...
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...