A. Mikkelsen

Private Hospital & Heart Center Varde

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Co-Authors

Zbigniew Rozynek

Adam Mickiewicz University in Poznań

Jon Otto Fossum

Norwegian University of Science and Technology

Khobaib Khobaib

Adam Mickiewicz University in Poznań

Arnljot Elgsaeter

Norwegian University of Science and Technology

Paul Dommersnes

Norwegian University of Science and Technology

Kenneth D. Knudsen

Institute for Energy Technology

Bjørn T. Stokke

Norwegian University of Science and Technology

Rene Castberg

University of Oslo

Leander Michels

Elkem (Norway)

Juraj Kurimský

Technical University of Košice

Cooperative Institutions

New York University Press

Division of Materials Research

Cambridge University Press

Norwegian University of Science and Technology

University of Oslo

Centre National de la Recherche Scientifique

Trondheim Kommune

Massachusetts Institute of Technology

Chinese Academy of Sciences

University College Lillebaelt

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Research Field

Measurement of the dynamic viscoelastic properties of polymer solutions using the Birnboim-Schrag multiple lump resonator. A theoretical and numerical study

Rheologica Acta (1992)

A. Mikkelsen Kenneth D. Knudsen Arnljot Elgsaeter

Dumbbell

10.1007/bf00701124

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Citations (7)

Electric-field-induced deformation, yielding, and crumpling of jammed particle shells formed on non-spherical Pickering droplets

Soft Matter (2021)

Khobaib Khobaib A. Mikkelsen Tom Vincent-Dospital Zbigniew Rozynek

We studied the behavior of a nonspherical Pickering droplet subjected to an electric stress. We explained the effect of droplet geometry, particle size, and electric field strength, on the deformation and collapsing of particle-covered droplets.

Particle (ecology)

Pickering emulsion

10.1039/d1sm00125f

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Citations (9)

Spectrin, human erythrocyte shapes, and mechanochemical properties

Biophysical Journal (1986)

Bjørn T. Stokke A. Mikkelsen Arnljot Elgsaeter

10.1016/s0006-3495(86)83644-x

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Citations (45)

Characteristic mechanical impedance of rheometers with axial symmetry. A theoretical and numerical analysis

Rheologica Acta (1992)

A. Mikkelsen Kenneth D. Knudsen Arnljot Elgsaeter

Mechanical impedance

Coaxial

10.1007/bf00701122

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Citations (7)

Radiation dose and image quality in pediatric bitewing imaging

Radiation Protection Dosimetry (2024)

Rajesh Rajalingam Karen Brage Louise Kjærby Nielsen F. B. Eriksen H. Jørgensen

Bitewing examinations are used to examine the pediatric dental status. The aim of this study was to compare the image quality and radiation dose between two different X-ray systems used for pediatric bitewing imaging.

10.1093/rpd/ncae227

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Citations (0)

Deformation of Particle-Laden Droplet in Viscous Liquid under DC Electric Fields

World Academy of Science, Engineering and Technology, International Journal of Biomedical and Biological Engineering (2018)

Khobaib Khobaib A. Mikkelsen Zbigniew Rozynek

Particle (ecology)

Source

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Particle-covered drops in electric fields: drop deformation and surface particle organization

Soft Matter (2018)

A. Mikkelsen Khobaib Khobaib Fredrik Kvalheim Eriksen Knut Jørgen Måløy Zbigniew Rozynek

Drops covered by adsorbed particles are a prominent research topic because they hold promise for a variety of practical applications. Unlocking the enormous potential of particle-laden drops in new material fabrication, for instance, requires understanding how surface particles affect the electrical and deformation properties of drops, as well as developing new routes for particle manipulation at the interface of drops. In this study, we utilized electric fields to experimentally investigate the mechanics of particle-covered silicone oil drops suspended in castor oil, as well as particle assembly at drop surfaces. We used particles with electrical conductivities ranging from insulating polystyrene to highly conductive silver. When subjected to electric fields, drops can change shape, rotate, or break apart. In the first part of this work, we demonstrate how the deformation magnitude and shape of drops, as well as their electrical properties, are affected by electric field strength, particle size, conductivity, and coverage. We also discuss the role of electrohydrodynamic flows on drop deformation. In the second part, we present the electric field-directed assembly and organization of particles at drop surfaces. In this regard, we studied various parameters in detail, including electric field strength, particle size, coverage, and electrical conductivity. Finally, we present a novel method for controlling the local particle coverage and packing of particles on drop surfaces by simply tuning the frequency of the applied electric field. This approach is expected to find uses in optical materials and applications.

Electrohydrodynamics

Particle (ecology)

Silicone oil

10.1039/c8sm00915e

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Citations (34)

Electric Field-Driven Assembly of Sulfonated Polystyrene Microspheres

Materials (2017)

A. Mikkelsen Jarosław Wojciechowski Michal Rajňák Juraj Kurimský Khobaib Khobaib

A designed assembly of particles at liquid interfaces offers many advantages for development of materials, and can be performed by various means. Electric fields provide a flexible method for structuring particles on drops, utilizing electrohydrodynamic circulation flows, and dielectrophoretic and electrophoretic interactions. In addition to the properties of the applied electric field, the manipulation of particles often depends on the intrinsic properties of the particles to be assembled. Here, we present an easy approach for producing polystyrene microparticles with different electrical properties. These particles are used for investigations into electric field-guided particle assembly in the bulk and on surfaces of oil droplets. By sulfonating polystyrene particles, we produce a set of particles with a range of dielectric constants and electrical conductivities, related to the sulfonation reaction time. The paper presents diverse particle behavior driven by electric fields, including particle assembly at different droplet locations, particle chaining, and the formation of ribbon-like structures with anisotropic properties.

Electrohydrodynamics

Particle (ecology)

Polystyrene

Dielectrophoresis

10.3390/ma10040329

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Citations (19)

Assembly of 1D Granular Structures from Sulfonated Polystyrene Microparticles

Materials (2017)

A. Mikkelsen Ahmet Kertmen Khobaib Khobaib Michal Rajňák Juraj Kurimský

Being able to systematically modify the electric properties of nano- and microparticles opens up new possibilities for the bottom-up fabrication of advanced materials such as the fabrication of one-dimensional (1D) colloidal and granular materials. Fabricating 1D structures from individual particles offers plenty of applications ranging from electronic sensors and photovoltaics to artificial flagella for hydrodynamic propulsion. In this work, we demonstrate the assembly of 1D structures composed of individual microparticles with modified electric properties, pulled out of a liquid environment into air. Polystyrene particles were modified by sulfonation for different reaction times and characterized by dielectric spectroscopy and dipolar force measurements. We found that by increasing the sulfonation time, the values of both electrical conductivity and dielectric constant of the particles increase, and that the relaxation frequency of particle electric polarization changes, causing the measured dielectric loss of the particles to shift towards higher frequencies. We attributed these results to water adsorbed at the surface of the particles. With sulfonated polystyrene particles exhibiting a range of electric properties, we showed how the electric properties of individual particles influence the formation of 1D structures. By tuning applied voltage and frequency, we were able to control the formation and dynamics of 1D structures, including chain bending and oscillation.

Polystyrene

Particle (ecology)

10.3390/ma10101212

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Citations (7)

Electro-hydrodynamic propulsion of counter-rotating Pickering drops

The European Physical Journal Special Topics (2016)

Paul Dommersnes A. Mikkelsen Jon Otto Fossum

Particle (ecology)

10.1140/epjst/e2016-60090-2

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Citations (14)