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Single-Step Production and Self-Assembly of Magnetic Nanostructures for Magneto-Responsive Soft Films

Sedrpooshan, Mehran LU ; Maltoni, Pierfrancesco ; Peddis, Davide ; Burke, Adam LU orcid ; Messing, Maria LU and Westerström, Rasmus LU (2025) In ACS applied materials & interfaces 17(14). p.21682-21690
Abstract
Magneto-responsive soft films constitute a fascinating class of smart materials and devices capable of performing various tasks, such as micromanipulation or transport, noninvasive surgery, and sensing. These components are fabricated by incorporating magnetic materials into flexible substrates. In this context, arranging magnetic particles into elongated chains exhibiting shape anisotropy has shown great potential. Here, we introduce a novel technique for fabricating magnetically responsive films using continuous single-step production and self-assembly of magnetic nanoparticles from a carrier gas at atmospheric pressure into anisotropic magnetic structures directly onto flexible polymer layers. We show that the resulting magnetic soft... (More)
Magneto-responsive soft films constitute a fascinating class of smart materials and devices capable of performing various tasks, such as micromanipulation or transport, noninvasive surgery, and sensing. These components are fabricated by incorporating magnetic materials into flexible substrates. In this context, arranging magnetic particles into elongated chains exhibiting shape anisotropy has shown great potential. Here, we introduce a novel technique for fabricating magnetically responsive films using continuous single-step production and self-assembly of magnetic nanoparticles from a carrier gas at atmospheric pressure into anisotropic magnetic structures directly onto flexible polymer layers. We show that the resulting magnetic soft films exhibit significant residual magnetization and a large response to external magnetic fields. Furthermore, we investigate the magnetic properties of the nanoparticle assemblies and show that interparticle interactions play a critical role in determining the final magnetic properties of the nanostructures. Moreover, we provide experimental evidence that fusing the nanoparticles via post-annealing results in a transition from magnetostatic to exchange interactions with an ≈50% increase in the coercivity. (Less)
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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
ACS applied materials & interfaces
volume
17
issue
14
pages
9 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:40148244
  • scopus:105003088414
ISSN
1944-8244
DOI
10.1021/acsami.5c00992
language
English
LU publication?
yes
id
d3101267-e5c7-4f2f-95ff-7f53b9d9ca57
date added to LUP
2025-04-29 13:55:21
date last changed
2025-04-30 09:27:56
@article{d3101267-e5c7-4f2f-95ff-7f53b9d9ca57,
  abstract     = {{Magneto-responsive soft films constitute a fascinating class of smart materials and devices capable of performing various tasks, such as micromanipulation or transport, noninvasive surgery, and sensing. These components are fabricated by incorporating magnetic materials into flexible substrates. In this context, arranging magnetic particles into elongated chains exhibiting shape anisotropy has shown great potential. Here, we introduce a novel technique for fabricating magnetically responsive films using continuous single-step production and self-assembly of magnetic nanoparticles from a carrier gas at atmospheric pressure into anisotropic magnetic structures directly onto flexible polymer layers. We show that the resulting magnetic soft films exhibit significant residual magnetization and a large response to external magnetic fields. Furthermore, we investigate the magnetic properties of the nanoparticle assemblies and show that interparticle interactions play a critical role in determining the final magnetic properties of the nanostructures. Moreover, we provide experimental evidence that fusing the nanoparticles via post-annealing results in a transition from magnetostatic to exchange interactions with an ≈50% increase in the coercivity.}},
  author       = {{Sedrpooshan, Mehran and Maltoni, Pierfrancesco and Peddis, Davide and Burke, Adam and Messing, Maria and Westerström, Rasmus}},
  issn         = {{1944-8244}},
  language     = {{eng}},
  number       = {{14}},
  pages        = {{21682--21690}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS applied materials & interfaces}},
  title        = {{Single-Step Production and Self-Assembly of Magnetic Nanostructures for Magneto-Responsive Soft Films}},
  url          = {{http://dx.doi.org/10.1021/acsami.5c00992}},
  doi          = {{10.1021/acsami.5c00992}},
  volume       = {{17}},
  year         = {{2025}},
}