Preparing polymer films doped with magnetic nanoparticles by spin-coating and melt-processing can induce an in-plane magnetic anisotropy

2011 ◽  
Vol 109 (7) ◽  
pp. 076105 ◽  
Author(s):  
Jelle Wouters ◽  
Oleg I. Lebedev ◽  
Gustaaf Van Tendeloo ◽  
Hitoshi Yamada ◽  
Norio Sato ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Anisotropy ◽  
Polymer Films ◽  
Spin Coating ◽  
Melt Processing

Preparation and physical characterization of cobalt iron oxide magnetic nanoparticles loaded polyvinyl alcohol

2021 ◽  
pp. 089270572098557
Author(s):  
M Abu-Abdeen ◽  
O Saber ◽  
E Mousa
Keyword(s):  
Iron Oxide ◽  
Magnetic Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Saturation Magnetization ◽  
Polymer Films ◽  
Magnetic Hysteresis ◽  
Thermal Method ◽  
Cobalt Iron Oxide ◽  
Cobalt Iron ◽  
Iron Oxide Magnetic Nanoparticles

A solvent thermal method which depends on a thermal process under critical temperature and pressure was used to prepare cobalt iron oxide magnetic nanoparticles with a molar ratio 2. The prepared particles were in the form of nanoparticles with diameter ranging from 5 to 10 nm and with amorphous structure. Magnetic hysteresis behavior with saturation magnetization 36.31 emu/g and coercivity 4 Oe were observed for the nanoparticles. Polyvinyl alcohol was loaded with different concentrations of cobalt iron oxide nanoparticles using casting technique. Hysteresis loops for the polymer films were observed and both the saturation magnetization and coercivity were increased from 0.36 to 16.03 emu/g and 115 to 293 Oe for samples containing 5 and 20 wt% of nanoparticles, respectively. The elastic modulus of films was increased from 2.7 to 4.9 GPa for unloaded and loaded samples with 20 wt%, respectively. The storage modulus of the polymer films was found to obey the percolation behavior.

Porous Structures of Polymer Films Prepared by Spin Coating with Mixed Solvents under Humid Condition

Langmuir ◽  
2006 ◽  
Vol 22 (10) ◽  
pp. 4594-4598 ◽  
Author(s):  
Min Soo Park ◽  
Wonchul Joo ◽  
Jin Kon Kim
Keyword(s):  
Polymer Films ◽  
Spin Coating ◽  
Mixed Solvents ◽  
Porous Structures ◽  
Humid Condition

Spin coating of thin and ultrathin polymer films

1998 ◽  
Vol 38 (12) ◽  
pp. 2039-2045 ◽  
Author(s):  
David B. Hall ◽  
Patrick Underhill ◽  
John M. Torkelson
Keyword(s):  
Polymer Films ◽  
Spin Coating ◽  
Ultrathin Polymer Films

scholarly journals Nanoporous Polymer Films from Immiscible Polymer Blends: Pore Size and Composition Dependence

2004 ◽  
Vol 856 ◽  
Author(s):  
Tong Liu ◽  
Rahmi Ozisik ◽  
Richard W. Siegel
Keyword(s):  
Pore Size ◽  
Polymer Films ◽  
Spin Coating ◽  
Composition Dependence ◽  
Processing Parameters ◽  
Immiscible Polymer Blends ◽  
Immiscible Blends ◽  
Nanoporous Films ◽  
Phase Separation Process ◽  
Poly Caprolactone

ABSTRACTNanoporous polymer films have been prepared using immiscible blends of polyetherimide (PEI) and poly(caprolactone diol) (PCLD). The films were prepared by spin-coating from a common solvent — dichloromethane (DCM). To create the nanoporous films, PCLD was removed by immersing the films in acetone, which dissolves PCLD only. Field emission scanning electron microscopy was used to study the porous structure. The pore structure of the films was affected by many factors such as composition of the blend, molecular weight, and various processing parameters. The formation of nanometer size pores was mainly due to the fast phase separation process during spin-coating. The pore size and pore size distribution was found to depend on the blend composition.

scholarly journals Nanoparticle Size Threshold for Magnetic Agglomeration and Associated Hyperthermia Performance

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2786
Author(s):  
David Serantes ◽  
Daniel Baldomir
Keyword(s):  
Magnetic Nanoparticles ◽  
Magnetic Anisotropy ◽  
Magnetic Dipole ◽  
Anisotropy Constant ◽  
K Value ◽  
Threshold Size ◽  
Magnetic Anisotropy Constant ◽  
Agglomeration Process ◽  
Size Threshold

The likelihood of magnetic nanoparticles to agglomerate is usually estimated through the ratio between magnetic dipole-dipole and thermal energies, thus neglecting the fact that, depending on the magnitude of the magnetic anisotropy constant (K), the particle moment may fluctuate internally and thus undermine the agglomeration process. Based on the comparison between the involved timescales, we study in this work how the threshold size for magnetic agglomeration (daggl) varies depending on the K value. Our results suggest that small variations in K-due to, e.g., shape contribution, might shift daggl by a few nm. A comparison with the usual superparamagnetism estimation is provided, as well as with the energy competition approach. In addition, based on the key role of the anisotropy in the hyperthermia performance, we also analyse the associated heating capability, as non-agglomerated particles would be of high interest for the application.

Comparative analysis of metal diffusion effects in polymer films coated with spin coating and floating film transfer techniques

2020 ◽  
Vol 264 ◽  
pp. 116378
Author(s):  
Nidhi Yadav ◽  
Kshitij Bhargava ◽  
Nikita Kumari ◽  
Shyam S. Pandey ◽  
Vipul Singh
Keyword(s):  
Comparative Analysis ◽  
Polymer Films ◽  
Spin Coating ◽  
Metal Diffusion ◽  
Diffusion Effects ◽  
Film Transfer
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