Diffusing-Wave Spectroscopy Study of the Motion of Magnetic Particles in Chemically Cross-Linked Gels under External Magnetic Fields

2003 ◽  
Vol 36 (8) ◽  
pp. 2985-2989 ◽  
Author(s):  
Tetsuharu Narita ◽  
Alexandra Knaebel ◽  
Jean-Pierre Munch ◽  
Sauveur Jean Candau ◽  
Miklós Zrínyi
Keyword(s):  
Magnetic Fields ◽  
Magnetic Particles ◽  
Diffusing Wave Spectroscopy ◽  
Spectroscopy Study

scholarly journals Infrared spectroscopy study of the in-plane response of YBa2Cu3O6.6 in magnetic fields up to 30 Tesla

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
F. Lyzwa ◽  
B. Xu ◽  
P. Marsik ◽  
E. Sheveleva ◽  
I. Crassee ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Magnetic Fields ◽  
Spectroscopy Study

scholarly journals Optical Imaging of Magnetic Particle Cluster Oscillation and Rotation in Glycerol

2021 ◽  
Vol 7 (5) ◽  
pp. 82
Author(s):  
River Gassen ◽  
Dennis Thompkins ◽  
Austin Routt ◽  
Philippe Jones ◽  
Meghan Smith ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Particles ◽  
Magnetic Particle ◽  
Barium Hexaferrite ◽  
Optical Microscope ◽  
Simplified Model ◽  
Particle Cluster ◽  
Average Deviation ◽  
Cross Sectional

Magnetic particles have been evaluated for their biomedical applications as a drug delivery system to treat asthma and other lung diseases. In this study, ferromagnetic barium hexaferrite (BaFe12O19) and iron oxide (Fe3O4) particles were suspended in water or glycerol, as glycerol can be 1000 times more viscous than water. The particle concentration was 2.50 mg/mL for BaFe12O19 particle clusters and 1.00 mg/mL for Fe3O4 particle clusters. The magnetic particle cluster cross-sectional area ranged from 15 to 1000 μμm2, and the particle cluster diameter ranged from 5 to 45 μμm. The magnetic particle clusters were exposed to oscillating or rotating magnetic fields and imaged with an optical microscope. The oscillation frequency of the applied magnetic fields, which was created by homemade wire spools inserted into an optical microscope, ranged from 10 to 180 Hz. The magnetic field magnitudes varied from 0.25 to 9 mT. The minimum magnetic field required for particle cluster rotation or oscillation in glycerol was experimentally measured at different frequencies. The results are in qualitative agreement with a simplified model for single-domain magnetic particles, with an average deviation from the model of 1.7 ± 1.3. The observed difference may be accounted for by the fact that our simplified model does not include effects on particle cluster motion caused by randomly oriented domains in multi-domain magnetic particle clusters, irregular particle cluster size, or magnetic anisotropy, among other effects.

scholarly journals Rheology of magnetic colloids containing clusters of particle platelets and polymer nanofibres

2020 ◽  
Vol 378 (2171) ◽  
pp. 20190255 ◽  
Author(s):  
Mariem Mekni Abrougui ◽  
Ezzeddine Srasra ◽  
Modesto T. Lopez-Lopez ◽  
Juan D. G. Duran
Keyword(s):  
Magnetic Fields ◽  
Magnetic Particles ◽  
Polymer Network ◽  
Soft Materials ◽  
Design Parameters ◽  
Heterogeneous Structure ◽  
High Porosity ◽  
Theme Issue ◽  
Wide Range ◽  
Magnetorheological Effect

Magnetic hydrogels (ferrogels) are soft materials with a wide range of applications, especially in biomedicine because (i) they can be provided with the required biocompatibility; (ii) their heterogeneous structure allows their use as scaffolds for tissue engineering; (iii) their mechanical properties can be modified by changing different design parameters or by the action of magnetic fields. These characteristics confer them unique properties for acting as patterns that mimic the architecture of biological systems. In addition, and (iv) given their high porosity and aqueous content, ferrogels can be loaded with drugs and guided towards specific targets for local (non-systemic) pharmaceutical treatments. The ferrogels prepared in this work contain magnetic particles obtained by precipitation of magnetite nanoparticles onto the porous surface of bentonite platelets. Then, the particles were functionalized by adsorption of alginate molecules and dispersed in an aqueous solution of sodium alginate. Finally, the gelation was promoted by cross-linking the alginate molecules with Ca 2+ ions. The viscoelastic properties of the ferrogels were measured in the absence/presence of external magnetic fields, showing that these ferrogels exhibited a strong enough magnetorheological effect. This behaviour is explained considering the field-induced strengthening of the heterogeneous (particle–polymer) network generated inside the ferrogel. This article is part of the theme issue ‘Patterns in soft and biological matters'.

scholarly journals Optical spectroscopy study of Ca3(Ru0.91Mn0.09)2O7 single crystal in high magnetic fields

2019 ◽  
Vol 64 (1) ◽  
pp. 20-25 ◽  
Author(s):  
Xueli Xu ◽  
Jin Peng ◽  
Junpei Zhang ◽  
Zongwei Ma ◽  
Cheng Chen ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Single Crystal ◽  
Optical Spectroscopy ◽  
High Magnetic Fields ◽  
Spectroscopy Study

scholarly journals Railway Actuator Made of Magnetic Elastomers and Driven by a Magnetic Field

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1351 ◽  
Author(s):  
Yasuhiro Umehara ◽  
Yusuke Yamanaga ◽  
Shota Akama ◽  
Shunsuke Kato ◽  
Shogo Kamoshita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Elastic Modulus ◽  
Magnetic Fields ◽  
Magnetic Particles ◽  
Fine Particles ◽  
Lateral Force ◽  
Railway Vehicle ◽  
Compression Tests ◽  
Field Stress ◽  
Magnetic Elastomers

We fabricated a mono-link using bimodal magnetic elastomers that demonstrate drastic changes in the elastic modulus by magnetic fields. The magnetic elastomer is bimodal consisting of large magnetic particles and nonmagnetic fine particles. The storage modulus for bimodal magnetic elastomers was altered from 2.2 × 105 to 1.7 × 106 Pa by a magnetic field of 500 mT. Compression tests up to a strain of 20% also revealed that the on-field stress for the bimodal magnetic elastomer was 1.24 times higher than the off-field stress. The bimodal magnetic elastomer was synthesized for the mono-link and was mounted on the bogie of a railway vehicle. A running test exhibited that the wheel lateral force was reduced by 20% by applying a magnetic field of 390 mT.

scholarly journals Sensitivity of 6CHBT Liquid Crystal Doped with Ferroelectric or Magnetic Particles to Electric and Magnetic Fields

2014 ◽  
Vol 126 (1) ◽  
pp. 260-261 ◽  
Author(s):  
J. Majorošová ◽  
N. Tomašovičová ◽  
M. Timko ◽  
M. Koneracká ◽  
I.P. Studenyak ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Magnetic Fields ◽  
Magnetic Particles ◽  
Electric And Magnetic Fields

scholarly journals Desorption of harmful hydrocarbon compounds in soil using micron-sized magnetic particles and high-frequency magnetic fields

Heliyon ◽  
2017 ◽  
Vol 3 (10) ◽  
pp. e00418 ◽  
Author(s):  
Bailey S. Tye ◽  
Rushi J. Vyas
Keyword(s):  
Magnetic Fields ◽  
High Frequency ◽  
Magnetic Particles

Influence of magnetic fields on the hydration process of amino acids: Vibrational spectroscopy study of L-phenylalanine and L-glutamine

2013 ◽  
Vol 35 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Antonella De Ninno ◽  
Agostina Congiu Castellano
Keyword(s):  
Amino Acids ◽  
Magnetic Fields ◽  
Vibrational Spectroscopy ◽  
Hydration Process ◽  
Spectroscopy Study

Targeting Magnetic Nanoparticles in High Magnetic Fields for Drug Delivery Purposes

2004 ◽  
Vol 820 ◽  
Author(s):  
Ramazan Asmatulu ◽  
Richard.O. Claus ◽  
Judy S. Riffle ◽  
Michael Zalich
Keyword(s):  
Magnetic Field ◽  
Drug Delivery ◽  
Magnetic Nanoparticles ◽  
Magnetic Fields ◽  
Magnetic Particles ◽  
Guidance System ◽  
Test Results ◽  
Test Parameters ◽  
Magnetic Guidance ◽  
The Magnetic Field

AbstractBiodegradable magnetic nanoparticles were synthesized using Poly(L-Lactic Acid) and magnetite nanoparticles (∼14 nm) at different dosages, and then these nanaoparticles (nanocomposites) and pure magnetic particles were targeted in external magnetic fields by changing the test parameters. The magnetic field test results showed that magnetic saturation, fluid speed, magnetic field distance and particle size were extremely effective for a magnetic guidance system that is needed for an effective drug delivery approach. Thus, it is assumed that such nanoparticles can carry drugs (chemotherapy) to be able to cure cancer tumors as well as many other diseases.

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