Rate of dimer formation in stable colloidal solutions quantified using an attractive interparticle force

M.R.W. Scheepers, A.R. Romijn, Leo J. van Ijzendoorn, Menno W.J. Prins (Corresponding author)

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Abstract

We describe an optomagnetic cluster experiment to understand and control the interactions between particles over a wide range of time scales. Aggregation is studied by magnetically attracting particles into dimers and by quantifying the number of dimers that become chemically bound within a certain time interval. An optomagnetic readout based on light scattering of rotating clusters is used to measure dimer formation rates. Magnetic field settings, that is, field rotation frequency, field amplitude, and on-and off-Times, have been optimized to independently measure both the magnetically induced dimers and chemically bound dimers. The chemical aggregation rate is quantified in solutions with different pH and ionic strengths. The measured rates are extrapolated to effective dimer formation rates in the absence of force, showing that aggregation rates can be quantified over several orders of magnitude, including conditions of very low chemical reactivity.

Original languageEnglish
Pages (from-to)10533-10541
Number of pages9
JournalLangmuir
Volume35
Issue number32
DOIs
Publication statusPublished - 13 Aug 2019

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Dimers
dimers
Agglomeration
Chemical reactivity
Particle interactions
Ionic strength
Light scattering
readout
light scattering
reactivity
Magnetic fields
intervals
magnetic fields
Experiments
interactions

Cite this

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Rate of dimer formation in stable colloidal solutions quantified using an attractive interparticle force. / Scheepers, M.R.W.; Romijn, A.R.; van Ijzendoorn, Leo J.; Prins, Menno W.J. (Corresponding author).

In: Langmuir, Vol. 35, No. 32, 13.08.2019, p. 10533-10541.

Research output: Contribution to journalArticleAcademicpeer-review

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