--- _id: '2282' abstract: - lang: eng text: Magnetic nanoparticles can be embedded in electrospun nanofibers and other polymeric matrices to prepare magnetic composites with defined magnetic and mechanical properties. Metal-oxide nanoparticles, such as magnetite or nickel-ferrite, are of special interest since they do not need a coating to avoid oxidation. Like other nanoparticles, these metal-oxide nanoparticles tend to form agglomerations, in this way modifying the magnetic properties of the composites. After studying this effect for the magnetic elements Co, Fe, Ni as well as permalloy (Py) in a previous study, defining a new method to quantify the nanoparticle distribution in a polymer, here we concentrate on the influence of agglomerations on the magnetic properties of metal-oxide nanoparticles with different diameters in non-magnetic matrices. article_type: original author: - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Jacek full_name: Grzybowski, Jacek last_name: Grzybowski - first_name: Andrea full_name: Ehrmann, Andrea id: '223776' last_name: Ehrmann orcid: 0000-0003-0695-3905 citation: alphadin: 'Blachowicz, Tomasz ; Grzybowski, Jacek ; Ehrmann, Andrea: Influence of agglomerations on magnetic properties of polymer matrices filled with magnetic nanoparticles. In: Materials Today: Proceedings Bd. 67, Elsevier BV (2022), S. 792–796' ama: 'Blachowicz T, Grzybowski J, Ehrmann A. Influence of agglomerations on magnetic properties of polymer matrices filled with magnetic nanoparticles. Materials Today: Proceedings. 2022;67:792-796. doi:10.1016/j.matpr.2022.07.362' apa: 'Blachowicz, T., Grzybowski, J., & Ehrmann, A. (2022). Influence of agglomerations on magnetic properties of polymer matrices filled with magnetic nanoparticles. Materials Today: Proceedings, 67, 792–796. https://doi.org/10.1016/j.matpr.2022.07.362' bibtex: '@article{Blachowicz_Grzybowski_Ehrmann_2022, title={Influence of agglomerations on magnetic properties of polymer matrices filled with magnetic nanoparticles}, volume={67}, DOI={10.1016/j.matpr.2022.07.362}, journal={Materials Today: Proceedings}, publisher={Elsevier BV}, author={Blachowicz, Tomasz and Grzybowski, Jacek and Ehrmann, Andrea}, year={2022}, pages={792–796} }' chicago: 'Blachowicz, Tomasz, Jacek Grzybowski, and Andrea Ehrmann. “Influence of Agglomerations on Magnetic Properties of Polymer Matrices Filled with Magnetic Nanoparticles.” Materials Today: Proceedings 67 (2022): 792–96. https://doi.org/10.1016/j.matpr.2022.07.362.' ieee: 'T. Blachowicz, J. Grzybowski, and A. Ehrmann, “Influence of agglomerations on magnetic properties of polymer matrices filled with magnetic nanoparticles,” Materials Today: Proceedings, vol. 67, pp. 792–796, 2022.' mla: 'Blachowicz, Tomasz, et al. “Influence of Agglomerations on Magnetic Properties of Polymer Matrices Filled with Magnetic Nanoparticles.” Materials Today: Proceedings, vol. 67, Elsevier BV, 2022, pp. 792–96, doi:10.1016/j.matpr.2022.07.362.' short: 'T. Blachowicz, J. Grzybowski, A. Ehrmann, Materials Today: Proceedings 67 (2022) 792–796.' date_created: 2022-12-23T14:53:32Z date_updated: 2024-03-27T14:01:15Z doi: 10.1016/j.matpr.2022.07.362 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2022-12-23T14:52:51Z date_updated: 2022-12-23T14:52:51Z file_id: '2283' file_name: _2022_Blachowicz_MaterTodayProc_online-first.pdf file_size: 1939143 relation: main_file success: 1 file_date_updated: 2022-12-23T14:52:51Z has_accepted_license: '1' intvolume: ' 67' keyword: - Magnetic nanoparticles Electrospinning Magnetite Nickel-ferrite Maghemite language: - iso: eng oa: '1' page: 792-796 publication: 'Materials Today: Proceedings' publication_identifier: issn: - '22147853' publication_status: published publisher: Elsevier BV quality_controlled: '1' status: public title: Influence of agglomerations on magnetic properties of polymer matrices filled with magnetic nanoparticles type: journal_article urn: urn:nbn:de:hbz:bi10-22821 user_id: '216459' volume: 67 year: '2022' ... --- _id: '2041' abstract: - lang: eng text: " Electrospinning can be used to produce nanofiber mats containing diverse nanoparticles for various purposes. Magnetic nanoparticles, such as magnetite (Fe3O4), can be introduced to produce magnetic nanofiber mats, e.g., for hyperthermia applications, but also for basic research of diluted magnetic systems. As the number of nanoparticles increases, however, the morphology and the mechanical properties of the nanofiber mats decrease, so that freestanding composite nanofiber mats with a high content of nanoparticles are hard to produce. Here we report on poly (acrylonitrile) (PAN) composite nanofiber mats, electrospun by a needle-based system, containing 50 wt% magnetite nanoparticles overall or in the shell of core–shell fibers, collected on a flat or a rotating collector. While the first nanofiber mats show an irregular morphology, the latter are quite regular and contain straight fibers without many beads or agglomerations. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) reveal agglomerations around the pure composite nanofibers and even, round core–shell fibers, the latter showing slightly increased fiber diameters. Energy dispersive X-ray spectroscopy (EDS) shows a regular distribution of the embedded magnetic nanoparticles. Dynamic mechanical analysis (DMA) reveals that mechanical properties are reduced as compared to nanofiber mats with smaller amounts of magnetic nanoparticles, but mats with 50 wt% magnetite are still freestanding.\r\n \ " article_number: '533' article_type: original author: - first_name: Al full_name: Mamun, Al last_name: Mamun - first_name: Lilia full_name: Sabantina, Lilia last_name: Sabantina - first_name: Michaela full_name: Klöcker, Michaela last_name: Klöcker - first_name: Alexander full_name: Heide, Alexander last_name: Heide - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Andrea full_name: Ehrmann, Andrea id: '223776' last_name: Ehrmann orcid: 0000-0003-0695-3905 citation: alphadin: 'Mamun, Al ; Sabantina, Lilia ; Klöcker, Michaela ; Heide, Alexander ; Blachowicz, Tomasz ; Ehrmann, Andrea: Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques. In: Polymers Bd. 14, MDPI AG (2022), Nr. 3' ama: Mamun A, Sabantina L, Klöcker M, Heide A, Blachowicz T, Ehrmann A. Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques. Polymers. 2022;14(3). doi:10.3390/polym14030533 apa: Mamun, A., Sabantina, L., Klöcker, M., Heide, A., Blachowicz, T., & Ehrmann, A. (2022). Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques. Polymers, 14(3). https://doi.org/10.3390/polym14030533 bibtex: '@article{Mamun_Sabantina_Klöcker_Heide_Blachowicz_Ehrmann_2022, title={Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques}, volume={14}, DOI={10.3390/polym14030533}, number={3533}, journal={Polymers}, publisher={MDPI AG}, author={Mamun, Al and Sabantina, Lilia and Klöcker, Michaela and Heide, Alexander and Blachowicz, Tomasz and Ehrmann, Andrea}, year={2022} }' chicago: Mamun, Al, Lilia Sabantina, Michaela Klöcker, Alexander Heide, Tomasz Blachowicz, and Andrea Ehrmann. “Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques.” Polymers 14, no. 3 (2022). https://doi.org/10.3390/polym14030533. ieee: A. Mamun, L. Sabantina, M. Klöcker, A. Heide, T. Blachowicz, and A. Ehrmann, “Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques,” Polymers, vol. 14, no. 3, 2022. mla: Mamun, Al, et al. “Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques.” Polymers, vol. 14, no. 3, 533, MDPI AG, 2022, doi:10.3390/polym14030533. short: A. Mamun, L. Sabantina, M. Klöcker, A. Heide, T. Blachowicz, A. Ehrmann, Polymers 14 (2022). date_created: 2022-07-14T17:59:30Z date_updated: 2024-03-27T14:01:14Z doi: 10.3390/polym14030533 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2022-07-14T17:59:05Z date_updated: 2022-07-14T17:59:05Z file_id: '2042' file_name: _2022_Mamun_Polymers14_533.pdf file_size: 15471389 relation: main_file success: 1 file_date_updated: 2022-07-14T17:59:05Z has_accepted_license: '1' intvolume: ' 14' issue: '3' keyword: - freestanding nanofiber mats - magnetic nanoparticles - needle-based electrospinning - coaxial spinning - dynamic mechanical analysis (DMA) - atomic force microscopy (AFM) - scanning electron microscopy (SEM) language: - iso: eng oa: '1' publication: Polymers publication_identifier: eissn: - 2073-4360 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: Electrospinning Nanofiber Mats with Magnetite Nanoparticles Using Various Needle-Based Techniques tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article urn: urn:nbn:de:hbz:bi10-20419 user_id: '216459' volume: 14 year: '2022' ... --- _id: '654' abstract: - lang: eng text: Magnetic nanofibers are of great interest in basic research, as well as for possible applications in spintronics and neuromorphic computing. Here we report on the preparation of magnetic nanofiber mats by electrospinning polyacrylonitrile (PAN)/nanoparticle solutions, creating a network of arbitrarily oriented nanofibers with a high aspect ratio. Since PAN is a typical precursor for carbon, the magnetic nanofiber mats were stabilized and carbonized after electrospinning. The magnetic properties of nanofiber mats containing magnetite or nickel ferrite nanoparticles were found to depend on the nanoparticle diameters and the potential after-treatment, as compared with raw nanofiber mats. Micromagnetic simulations underlined the different properties of both magnetic materials. Atomic force microscopy and scanning electron microscopy images revealed nearly unchanged morphologies after stabilization without mechanical fixation, which is in strong contrast to pure PAN nanofiber mats. While carbonization at 500 °C left the morphology unaltered, as compared with the stabilized samples, stronger connections between adjacent fibers were formed during carbonization at 800 °C, which may be supportive of magnetic data transmission. article_number: '1552' article_type: original author: - first_name: Nadine full_name: Fokin, Nadine last_name: Fokin - first_name: Timo full_name: Grothe, Timo id: '221330' last_name: Grothe orcid: 0000-0002-9099-4277 orcid_put_code_url: https://api.orcid.org/v2.0/0000-0002-9099-4277/work/94763644 - first_name: Al full_name: Mamun, Al last_name: Mamun - first_name: Marah full_name: Trabelsi, Marah last_name: Trabelsi - first_name: Michaela full_name: Klöcker, Michaela last_name: Klöcker - first_name: Lilia full_name: Sabantina, Lilia last_name: Sabantina - first_name: Christoph full_name: Döpke, Christoph last_name: Döpke - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Andreas full_name: Hütten, Andreas last_name: Hütten - first_name: Andrea full_name: Ehrmann, Andrea id: '223776' last_name: Ehrmann orcid: 0000-0003-0695-3905 orcid_put_code_url: https://api.orcid.org/v2.0/0000-0003-0695-3905/work/94763646 citation: alphadin: 'Fokin, Nadine ; Grothe, Timo ; Mamun, Al ; Trabelsi, Marah ; Klöcker, Michaela ; Sabantina, Lilia ; Döpke, Christoph ; Blachowicz, Tomasz ; u. a.: Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization. In: Materials Bd. 13 (2020), Nr. 7' ama: Fokin N, Grothe T, Mamun A, et al. Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization. Materials. 2020;13(7). doi:10.3390/ma13071552 apa: Fokin, N., Grothe, T., Mamun, A., Trabelsi, M., Klöcker, M., Sabantina, L., … Ehrmann, A. (2020). Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization. Materials, 13(7). https://doi.org/10.3390/ma13071552 bibtex: '@article{Fokin_Grothe_Mamun_Trabelsi_Klöcker_Sabantina_Döpke_Blachowicz_Hütten_Ehrmann_2020, title={Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization}, volume={13}, DOI={10.3390/ma13071552}, number={71552}, journal={Materials}, author={Fokin, Nadine and Grothe, Timo and Mamun, Al and Trabelsi, Marah and Klöcker, Michaela and Sabantina, Lilia and Döpke, Christoph and Blachowicz, Tomasz and Hütten, Andreas and Ehrmann, Andrea}, year={2020} }' chicago: Fokin, Nadine, Timo Grothe, Al Mamun, Marah Trabelsi, Michaela Klöcker, Lilia Sabantina, Christoph Döpke, Tomasz Blachowicz, Andreas Hütten, and Andrea Ehrmann. “Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization.” Materials 13, no. 7 (2020). https://doi.org/10.3390/ma13071552. ieee: N. Fokin et al., “Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization,” Materials, vol. 13, no. 7, 2020. mla: Fokin, Nadine, et al. “Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization.” Materials, vol. 13, no. 7, 1552, 2020, doi:10.3390/ma13071552. short: N. Fokin, T. Grothe, A. Mamun, M. Trabelsi, M. Klöcker, L. Sabantina, C. Döpke, T. Blachowicz, A. Hütten, A. Ehrmann, Materials 13 (2020). date_created: 2021-01-03T16:31:45Z date_updated: 2021-06-01T09:07:50Z department: - _id: '103' doi: 10.3390/ma13071552 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2021-01-03T16:31:11Z date_updated: 2021-01-03T16:31:11Z file_id: '655' file_name: _2020_Fokin_materials13_1552_v2.pdf file_size: 5060954 relation: main_file success: 1 file_date_updated: 2021-01-03T16:31:11Z funded_apc: '1' has_accepted_license: '1' intvolume: ' 13' issue: '7' keyword: - ferrimagnetic materials - superparamagnetism - magnetic hysteresis - magnetic materials - magnetic nanoparticles - nanocomposites - nanowires language: - iso: eng oa: '1' publication: Materials publication_identifier: issn: - 1996-1944 publication_status: published quality_controlled: '1' status: public title: Magnetic Properties of Electrospun Magnetic Nanofiber Mats after Stabilization and Carbonization type: journal_article user_id: '237837' volume: 13 year: '2020' ... --- _id: '639' abstract: - lang: eng text: One-dimensional materials, such as nanowires, nanotubes, or nanofibers, have attracted more and more attention recently due to their unique physical properties. Their large length-to-diameter ratio creates anisotropic material properties which could not be reached in bulk material. Especially one-dimensional magnetic structures are of high interest since the strong shape anisotropy reveals new magnetization reversal modes and possible applications. One possibility to create magnetic nanofibers in a relatively simple way is offered by electrospinning them from polymer solutions or melts with incorporated magnetic nanoparticles. This review gives an overview of most recent methods of electrospinning magnetic nanofibers, measuring their properties as well as possible applications from basic research to single-cell manipulation to microwave absorption. article_number: '155892501990084' article_type: review author: - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Andrea full_name: Ehrmann, Andrea last_name: Ehrmann date_created: 2021-01-03T14:45:37Z date_updated: 2021-01-18T15:32:28Z ddc: - '620' department: - _id: '103' doi: 10.1177/1558925019900843 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2021-01-03T14:45:07Z date_updated: 2021-01-03T14:45:07Z file_id: '640' file_name: _2020_Blachowicz_JEFF15_1558925019900843.pdf file_size: 1135710 relation: main_file success: 1 file_date_updated: 2021-01-03T14:45:07Z funded_apc: '1' has_accepted_license: '1' intvolume: ' 15' keyword: - Electrospinning - magnetic nanoparticles - nanofibers language: - iso: eng oa: '1' publication: Journal of Engineered Fibers and Fabrics publication_identifier: issn: - 1558-9250 - 1558-9250 publication_status: published quality_controlled: '1' status: public title: 'Most recent developments in electrospun magnetic nanofibers: A review' type: journal_article user_id: '223776' volume: 15 year: '2020' ... --- _id: '662' abstract: - lang: eng text: Neuromorphic computing is assumed to be significantly more energy efficient than, and at the same time expected to outperform, conventional computers in several applications, such as data classification, since it overcomes the so-called von Neumann bottleneck. Artificial synapses and neurons can be implemented into conventional hardware using new software, but also be created by diverse spintronic devices and other elements to completely avoid the disadvantages of recent hardware architecture. Here, we report on diverse approaches to implement neuromorphic functionalities in novel hardware using magnetic elements, published during the last years. Magnetic elements play an important role in neuromorphic computing. While other approaches, such as optical and conductive elements, are also under investigation in many groups, magnetic nanostructures and generally magnetic materials offer large advantages, especially in terms of data storage, but they can also unambiguously be used for data transport, e.g., by propagation of skyrmions or domain walls. This review underlines the possible applications of magnetic materials and nanostructures in neuromorphic systems. article_number: '2550' article_type: review author: - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Andrea full_name: Ehrmann, Andrea last_name: Ehrmann date_created: 2021-01-03T16:40:37Z date_updated: 2021-01-18T15:32:28Z ddc: - '530' department: - _id: '103' doi: 10.3390/molecules25112550 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2021-01-03T16:40:04Z date_updated: 2021-01-03T16:40:04Z file_id: '663' file_name: _2020_Blachowicz_Molecules25_2550_v2.pdf file_size: 5784324 relation: main_file success: 1 file_date_updated: 2021-01-03T16:40:04Z funded_apc: '1' has_accepted_license: '1' intvolume: ' 25' issue: '11' keyword: - neuromorphic computing - adaptive computing - cognitive computing - magnetism - micromagnetic simulations - magnetic nanoparticles - neural network language: - iso: eng oa: '1' publication: Molecules publication_identifier: issn: - 1420-3049 publication_status: published quality_controlled: '1' status: public title: Magnetic Elements for Neuromorphic Computing type: journal_article user_id: '223776' volume: 25 year: '2020' ...