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Publications (10 of 23) Show all publications
Riordan, E., Blomgren, J., Jonasson, C., Ahrentorp, F., Johansson, C., Margineda, D., . . . Giblin, S. R. (2019). Design and implementation of a low temperature, inductance based high frequency alternating current susceptometer.. Paper presented at 2019/08/08. Review of Scientific Instruments, 90(7)
Open this publication in new window or tab >>Design and implementation of a low temperature, inductance based high frequency alternating current susceptometer.
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2019 (English)In: Review of Scientific Instruments, Vol. 90, no 7Article in journal (Refereed) Published
Abstract [en]

We report on the implementation of an induction based, low temperature, high frequency ac susceptometer capable of measuring at frequencies up to 3.5 MHz and at temperatures between 2 K and 300 K. Careful balancing of the detection coils and calibration allow a sample magnetic moment resolution of 5 × 10−10 Am2 at 1 MHz. We discuss the design and characterization of the susceptometer and explain the calibration process. We also include some example measurements on the spin ice material CdEr2S4 and iron oxide based nanoparticles to illustrate functionality.

National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39702 (URN)10.1063/1.5074154 (DOI)2-s2.0-85070086254 (Scopus ID)
Conference
2019/08/08
Available from: 2019-08-08 Created: 2019-08-08 Last updated: 2019-10-17Bibliographically approved
Baresel, C., Schaller, V., Jonasson, C., Johansson, C., Bordes, R., Chauhan, V., . . . Welling, S. (2019). Functionalized magnetic particles for water treatment. Heliyon, 5(8), Article ID e02325.
Open this publication in new window or tab >>Functionalized magnetic particles for water treatment
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2019 (English)In: Heliyon, ISSN 2405-8440, Vol. 5, no 8, article id e02325Article in journal (Refereed) Published
Abstract [en]

In this study, we have taken the concept of water treatment by functionalized magnetic particles one step forward by integrating the technology into a complete proof of concept, which included the preparation of surface modified beads, their use as highly selective absorbents for heavy metals ions (Zinc, Nickel), and their performance in terms of magnetic separation. The separation characteristics were studied both through experiments and by simulations. The data gathered from these experimental works enabled the elaboration of various scenarios for Life Cycle Analysis (LCA). The LCA showed that the environmental impact of the system is highly dependent on the recovery rate of the magnetic particles. The absolute impact on climate change varied significantly among the scenarios studied and the recovery rates. The results support the hypothesis that chelation specificity, magnetic separation and bead recovery should be optimized to specific targets and applications. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Chemical engineering, Environmental science, Life cycle assessment, Magnetic particle, Materials chemistry, Nanotechnology, Pollutant, Water treatment
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39844 (URN)10.1016/j.heliyon.2019.e02325 (DOI)2-s2.0-85070906522 (Scopus ID)
Note

This work was supported by VINNOVA , the Swedish Governmental Agency for Innovation, within the call Innovationer för ett hållbart samhälle: miljö och transport.

Available from: 2019-10-01 Created: 2019-10-01 Last updated: 2019-10-17Bibliographically approved
Jonasson, C., Schaller, V., Zeng, L., Olsson, E., Frandsen, C., Castro, A., . . . Johansson, C. (2019). Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance. Journal of Magnetism and Magnetic Materials, 477, 198-202
Open this publication in new window or tab >>Modelling the effect of different core sizes and magnetic interactions inside magnetic nanoparticles on hyperthermia performance
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2019 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 477, p. 198-202Article in journal (Refereed) Published
Abstract [en]

We present experimental intrinsic loss power (ILP) values, measured at an excitation frequency of 1 MHz and at relatively low field amplitudes of 3.4 to 9.9 kA/m, as a function of the mean core diameter, for selected magnetic nanoparticle (MNP). The mean core sizes ranged from ca. 8 nm to 31 nm. Transmission electron microscopy indicated that those with smaller core sizes (less than ca. 22 nm) were single-core MNPs, while those with larger core sizes (ca. 29 nm to 31 nm) were multi-core MNPs. The ILP data showed a peak at ca. 20 nm. We show here that this behaviour correlates well with the predicted ILP values obtained using either a non-interacting Debye model, or via dynamic Monte-Carlo simulations, the latter including core-core magnetic interactions for the multi-core particles. This alignment of the models is a consequence of the low field amplitudes used. We also present interesting results showing that the core-core interactions affect the ILP value differently depending on the mean core size.

Keywords
magnetic nanoparticles, magnetic interactions, magnetic relaxation, Monte-Carlo simulations, multi-core particles, single-core particles
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36361 (URN)10.1016/j.jmmm.2018.09.117 (DOI)2-s2.0-85060279115 (Scopus ID)
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-10-17Bibliographically approved
Sriviriyakul, T., Bogren, S., Schaller, V., Jonasson, C., Blomgren, J., Ahrentorp, F., . . . Johansson, C. (2019). Nanorheological studies of xanthan/water solutions using magnetic nanoparticles. Journal of Magnetism and Magnetic Materials, 473, 268-271
Open this publication in new window or tab >>Nanorheological studies of xanthan/water solutions using magnetic nanoparticles
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2019 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 473, p. 268-271Article in journal (Refereed) Published
Abstract [en]

We show results of nanorheological studies of different concentrations of xanthan (non-Newtonian fluid) in water using magnetic nanoparticles (MNPs) together with the AC susceptibility (ACS) vs frequency method. For comparison we also show the ACS response for different concentrations of glycerol in water (Newtonian fluid). The ACS response is measured, and the data is modelled using dynamic magnetic models and different viscoelastic models. We study the ACS response (in-phase and out-of-phase ACS components) at different concentrations of xanthan in water (up to 1 wt% xanthan) and with a constant concentration of MNPs. We use MNP systems that show Brownian relaxation (sensitive to changes in the environmental properties around the MNPs). ACS measurements are performed using the DynoMag system. The Brownian relaxation of the MNP system peak is shifting down in frequency and the ACS response is broadening and decreases due to changes in the viscoelastic properties around the MNPs in the xanthan solution. The viscosity and the storage moduli are determined at each excitation frequency and compared with traditional macroscopic small amplitude oscillatory shear rheological measurements. The results from the traditional rheological and nanorheological measurements correlate well at higher xanthan concentration.

Place, publisher, year, edition, pages
Elsevier B.V., 2019
Keywords
AC susceptibility, Brownian relaxation, Glycerol, Magnetic multi-core nanoparticles, Nanorheological measurements, Xanthan, Brownian movement, Digital storage, Magnetic susceptibility, Nanoparticles, Non Newtonian flow, Non Newtonian liquids, Rheology, Viscoelasticity, Ac susceptibility (ACS), Brownian relaxations, Magnetic nano-particles, Magnetic nanoparti cles (MNPs), Multi core, Viscoelastic properties, Nanomagnetics
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-35560 (URN)10.1016/j.jmmm.2018.09.103 (DOI)2-s2.0-85055085870 (Scopus ID)
Note

The authors acknowledge Josefine Mosser for assistance with experimental work. This project receives funding from The Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning ( FORMAS ) under grant number 2016-00253 .

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2019-10-17Bibliographically approved
Wetterskog, E., Jonasson, C., Smilgies, D.-M., Schaller, V., Johansson, C. & Svedlindh, P. (2018). Colossal Anisotropy of the Dynamic Magnetic Susceptibility in Low-Dimensional Nanocube Assemblies. ACS Nano, 12(2), 1403-1412
Open this publication in new window or tab >>Colossal Anisotropy of the Dynamic Magnetic Susceptibility in Low-Dimensional Nanocube Assemblies
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2018 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 12, no 2, p. 1403-1412Article in journal (Refereed) Submitted
Abstract [en]

nanocubes display a significant augmentation of the magnetic susceptibility and dissipation as compared to 0D and 2D systems. The performance of the nanocube needles is highlighted by a colossal anisotropy factor defined as the ratio of the parallel to the perpendicular magnetization components. We show that the origin of this effect cannot be ascribed to shape anisotropy in its classical sense; as such, it has no analogy in bulk magnetic materials. The temperature-dependent anisotropy factors of the in- and out-of-phase components of the magnetization have an extremely strong particle size dependence and reach values of 80 and 2500, respectively, for the largest nanocubes in this study. Aided by simulations, we ascribe the anisotropy of the magnetic susceptibility, and its strong particle-size dependence to a synergistic coupling between the dipolar interaction field and a net anisotropy field resulting from a partial texture in the 1D nanocube needles.

Keywords
ac-susceptibility, anisotropy, arrays, assemblies, magnetic nanoparticles, magnetic properties, supercrystals
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33343 (URN)10.1021/acsnano.7b07745 (DOI)29328678 (PubMedID)2-s2.0-85042705323 (Scopus ID)
Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2019-10-17Bibliographically approved
Blomgren, J., Ahrentorp, F., Ilver, D., Jonasson, C., Sepehri, S., Kalaboukhov, A., . . . Johansson, C. (2018). Development of a sensitive induction-based magnetic nanoparticle biodetection method. Nanomaterials, 8(11), Article ID 887.
Open this publication in new window or tab >>Development of a sensitive induction-based magnetic nanoparticle biodetection method
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2018 (English)In: Nanomaterials, ISSN 2079-4991, Vol. 8, no 11, article id 887Article in journal (Refereed) Published
Abstract [en]

We developed a novel biodetection method for influenza virus based on AC magnetic susceptibility measurement techniques (the DynoMag induction technique) together with functionalized multi-core magnetic nanoparticles. The sample consisting of an incubated mixture of magnetic nanoparticles and rolling circle amplified DNA coils is injected into a tube by a peristaltic pump. The sample is moved as a plug to the two well-balanced detection coils and the dynamic magnetic moment in each position is read over a range of excitation frequencies. The time for making a complete frequency sweep over the relaxation peak is about 5 minutes (10 Hz–10 kHz with 20 data points). The obtained standard deviation of the magnetic signal at the relaxation frequency (around 100 Hz) is equal to about 10−5 (volume susceptibility SI units), which is in the same range obtained with the DynoMag system. The limit of detection with this method is found to be in the range of 1 pM.

Keywords
AC susceptibility, Brownian relaxation, Magnetic biosensing, Magnetic nanoparticles, Multi-core particles
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36359 (URN)10.3390/nano8110887 (DOI)2-s2.0-85056217345 (Scopus ID)
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2019-10-17Bibliographically approved
Jonsson, P., Lindgren, D., Asplund, M., Stavjklint, H., Magounakis, M., Mokhlesi, S., . . . Strömbeck, N. (2018). Svenskt Vatten Utveckling Elektronisk tunga och andra onlinesensorer för detektion av föroreningar i dricksvattennätet – en utvärdering.
Open this publication in new window or tab >>Svenskt Vatten Utveckling Elektronisk tunga och andra onlinesensorer för detektion av föroreningar i dricksvattennätet – en utvärdering
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2018 (English)Report (Other academic)
Abstract [sv]

Projektet har utvärderat olika onlinesensorer för att upptäcka föroreningar från avloppsvatten i dricksvattennätet. Flera kommersiella sensorer kunde detektera inläckage vid koncentrationer av avloppsvatten på cirka 0,7 procent, men bäst var den nyutvecklade sensor som kallas elektronisk tunga. Den kunde med låg sannolikhet för falsklarm detektera ner till åtminstone 0,05 procent avloppsvatten. Vanliga problem som kan ge upphov till smitta via dricksvatten är gamla och läckande ledningsnät som ger tryckfall, eller felaktiga kopplingar som gör att ytvatten och avloppsvatten kan förorena dricksvattnet. Risken för inläckage av avloppsvatten ansågs i projektet vara det högst prioriterade scenariot. Med ett nätverk av sensorer i dricksvattennätet och ett effektivt övervakningssystem skulle man kunna upptäcka och lokalisera föroreningskällan och ingripa med nödvändiga åtgärder innan det förorenade vattnet når kunderna.

Projektet utfördes av Tekniska verken i Linköping i samverkan med Totalförsvarets forskningsinstitut (FOI) och ett stort antal andra aktörer. I en referensgrupp ingick ett antal svenska dricksvattenproducenter som ställde upp viktiga kriterier för onlinesensorer i dricksvattennätet. Sensorerna ska vara billiga, robusta, driftsäkra, anpassade för driftmiljön och kräva lite underhåll. De ska inte behöva förbehandling eller reagenser och bör helst mäta direkt på det trycksatta nätet. De bör helst vara generella, det vill säga upptäcka alla typer av föroreningar, men det är ett stort mervärde om de kan klassificera typen av förorening. Den elektroniska tungan har vidareutvecklats inom Vinnovaprojektet Sensation III. Även de nya sensorerna flödescytometer och elektronisk näsa testades i projektet, liksom standardsensorer för konduktivitet, pH och kloröverskott, samt en avancerad sensor baserad på optisk absorbans. Testerna skedde i en rigg på avloppsreningsverket i Linköping under ett par månader då olika koncentrationer av avloppsvatten tillfördes. Även syntetiskt avloppsvatten och råvatten tillfördes vid några tillfällen. Två elektroniska tungor testades även vid en tryckstegringsstation respektive vid vattentornet under cirka ett år. Olika typer av signalbehandling undersöktes för att optimera larmalgoritmerna.

Resultaten visar att det är möjligt att upptäcka inläckage av avloppsvatten i dricksvattnet med hjälp av onlinesensorer. Även standardsensorer för konduktivitet och pH kunde detektera inläckage av avloppsvatten, men bäst resultat gav den elektroniska tungan. Sensorn för optisk absorbans hade en detektionsgräns mellan den elektroniska tungan och standardsensorerna. I anläggningar med större utspädning av avloppsvattnet än i Linköping kommer sensorerna förmodligen att ha en högre detektionsgräns.

För att det ska bli möjligt att övervaka dricksvattenkvaliteten med hjälp av onlinesensorer krävs det nära samverkan mellan sensortillverkare, dricksvattenproducenter och -distributörer, eftersom det behövs fortsatta tester och är så svårt att kravställa och bestämma prestandan för sensorerna för alla tänkbara vatten.

Publisher
p. 72
Series
Svenskt vatten utveckling ; 2018:15
Keywords
Faecal contamination drinking water, online sensors, early warning, electronic tongue, Fekal påverkan dricksvatten, onlinesensorer, tidig varning, elektronisk tunga
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37742 (URN)
Available from: 2019-02-08 Created: 2019-02-08 Last updated: 2019-10-17Bibliographically approved
Ludwig, F., Balceris, C., Jonasson, C. & Johansson, C. (2017). Analysis of AC Susceptibility Spectra for the Characterization of Magnetic Nanoparticles. IEEE transactions on magnetics, 53(11), Article ID 7898860.
Open this publication in new window or tab >>Analysis of AC Susceptibility Spectra for the Characterization of Magnetic Nanoparticles
2017 (English)In: IEEE transactions on magnetics, ISSN 0018-9464, E-ISSN 1941-0069, Vol. 53, no 11, article id 7898860Article in journal (Refereed) Published
Abstract [en]

Measurements of the ac susceptibility (ACS) as a function of frequency have been widely applied for the determination of structure parameters of magnetic nanoparticles (MNP). The analysis of spectra of real and imaginary parts measured on suspensions of MNP is generally based on the Debye model, extended by distributions of size parameters. Here, we compare different modifications of the Debye model with experimental data recorded on suspensions of single-core and multi-core iron-oxide nanoparticles. The applied models also depend on whether the nanoparticle's magnetic moments are thermally blocked and whether both Brownian and Néel relaxation have to be taken into account. The obtained core and hydrodynamic size parameters are compared with those from transmission electron microscopy and dynamic light scattering. Whereas structure parameters can be reliably determined for single-core nanoparticles, the interpretation of ACS spectra measured on multi-core nanoparticles is more complicated, especially regarding the contribution of particles relaxing via the Néel mechanism. Depending on the packing density and thus the interaction between cores in a particle, the effective core parameters derived from the spectrum must be interpreted with care.

Keywords
AC susceptibility (ACS), Brownian and Néel relaxation, Debye model, single-core and multi-core magnetic nanoparticles (MNP), High resolution transmission electron microscopy, Iron oxides, Light scattering, Magnetic moments, Magnetic susceptibility, Magnetism, Nanoparticles, Phonons, Transmission electron microscopy, Brownian, Debye models, Function of frequency, Iron oxide nanoparticle, Magnetic nanoparticles, Real and imaginary, Structure parameter, Nanomagnetics
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32816 (URN)10.1109/TMAG.2017.2693420 (DOI)2-s2.0-85032943089 (Scopus ID)
Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2019-10-17Bibliographically approved
Fock, J., Jonasson, C., Johansson, C. & Hansen, M. F. (2017). Characterization of fine particles using optomagnetic measurements. Physical Chemistry, Chemical Physics - PCCP, 19(13), 8802-8814
Open this publication in new window or tab >>Characterization of fine particles using optomagnetic measurements
2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 13, p. 8802-8814Article in journal (Refereed) Published
Abstract [en]

The remanent magnetic moment and the hydrodynamic size are important parameters for the synthesis and applications of magnetic nanoparticles (MNPs). We present the theoretical basis for the determination of the remanent magnetic moment and the hydrodynamic size of MNPs with a narrow size distribution using optomagnetic measurements. In these, the 2nd harmonic variation of the intensity of light transmitted through an MNP suspension is measured as a function of an applied axial oscillating magnetic field. We first show how the measurements of the optomagnetic signal magnitude at a low frequency vs. magnetic field amplitude can be used to determine the MNP moment. Subsequently, we use linear response theory to describe the dynamic non-equilibrium response of the MNP suspension at low magnetic field amplitudes and derive a link between optomagnetic measurements and magnetic AC susceptibility measurements. We demonstrate the presented methodology on two samples of commercially available multi-core MNPs. The results compare well with those obtained by dynamic light scattering, AC susceptibility and vibrating sample magnetometry measurements on the same samples when the different weighting of the particle size in the techniques is taken into account. The optomagnetic technique is simple, fast and does not require prior knowledge of the concentration of MNPs and it thus has the potential to be used as a routine tool for quality control of MNPs.

National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-31162 (URN)10.1039/c6cp08749c (DOI)2-s2.0-85019383784 (Scopus ID)
Available from: 2017-08-23 Created: 2017-08-23 Last updated: 2019-10-17Bibliographically approved
Schanzenbach, C., Ilver, D., Blomgren, J., Jonasson, C., Johansson, C., Krozer, A., . . . Rustas, B.-O. (2017). Preparation and characterisation of a sensing system for wireless pH measurements in vivo, in a rumen of a cow. Sensors and actuators. B, Chemical, 242, 637-644
Open this publication in new window or tab >>Preparation and characterisation of a sensing system for wireless pH measurements in vivo, in a rumen of a cow
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2017 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 242, p. 637-644Article in journal (Refereed) Published
Abstract [en]

We describe a sensing system that is able to measure pH in-vivo, in the rumen of a cow, in real time. The sensing principle is based on gravimetric transduction using a magnetoelastic ribbon functionalized by pH-sensitive nanobeads that is placed in the rumen where it is actuated and read-out wirelessly. We describe a generic procedure that enables one to deposit monolayers or multilayers of nano- and micro beads onto virtually any substrate. The topography of the resulting layers as well as interlayer coverages were characterised using optical microscopy and scanning profilometry. First we determined performance of the system in-vitro, in phosphate-buffered saline, in McDougall's buffer and in a rumen fluid. Thereafter we also performed in-vivo measurements. Using buffers we determined pH response in the liquids both at the fundamental frequency of the functionalised foils, and at the 1st overtone. We argue that observed frequency changes vs pH are mainly due to changes of trapped liquid when the bead layers shrink or expand as a response to changed pH. The data obtained from the pH response of magnetoelastic foils at different bead coverages was modelled by a simple two-parameter model that corroborates this assumption.

Keywords
Layer-by-layer deposition, Magnetoelastic resonance, Mussel adhesive protein, Nanoparticle multilayers, pH sensitive polymer, Rumen pH, Deposition, Multilayers, Potentiometric sensors, Layer by layer deposition, Magneto-elastic, Mussel adhesive proteins, Ph sensitive polymers, pH sensors
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-29324 (URN)10.1016/j.snb.2016.11.089 (DOI)2-s2.0-84998829105 (Scopus ID)
Available from: 2017-05-12 Created: 2017-05-12 Last updated: 2019-10-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0792-7039

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