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Stancu V, Galatanu A, Enculescu M, Onea M, Popescu B, Palade P, Aradoaie M, Ciobanu R, Pintilie L. Influences of Dispersions' Shapes and Processing in Magnetic Field on Thermal Conductibility of PDMS-Fe 3O 4 Composites. MATERIALS (BASEL, SWITZERLAND) 2021; 14:3696. [PMID: 34279266 PMCID: PMC8269840 DOI: 10.3390/ma14133696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 06/22/2021] [Accepted: 06/28/2021] [Indexed: 12/19/2022]
Abstract
Composites of magnetite (Fe3O4) nanoparticles dispersed in a polydimethylsiloxane (PDMS) matrix were prepared by a molding process. Two types of samples were obtained by free polymerization with randomly dispersed particles and by polymerization in an applied magnetic field. The magnetite nanoparticles were obtained from magnetic micrograins of acicular goethite (α-FeOOH) and spherical hematite (α-Fe2O3), as demonstrated by XRD measurements. The evaluation of morphological and compositional properties of the PDMS:Fe3O4 composites, performed by SEM and EDX, showed that the magnetic particles were uniformly distributed in the polymer matrix. Addition of magnetic dispersions promotes an increase of thermal conductivity compared with pristine PDMS, while further orienting the powders in a magnetic field during the polymerization process induces a decrease of the thermal conductivity compared with the un-oriented samples. The shape of the magnetic dispersions is an important factor, acicular dispersions providing a higher value for thermal conductivity compared with classic commercial powders with almost spherical shapes.
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Affiliation(s)
- V Stancu
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - A Galatanu
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - M Enculescu
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - M Onea
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
- Faculty of Physics, University of Bucharest, Atomistilor 405, 077125 Magurele, Romania
| | - B Popescu
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - P Palade
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - M Aradoaie
- Department of Electrical Measurements and Materials, Faculty of Electrical Engineering, Technical University Gh. Asachi Iasi, Boulevard Profesor Dimitrie Mangeron 67, 70050 Iasi, Romania
| | - R Ciobanu
- Department of Electrical Measurements and Materials, Faculty of Electrical Engineering, Technical University Gh. Asachi Iasi, Boulevard Profesor Dimitrie Mangeron 67, 70050 Iasi, Romania
- All Green SRL, 8 G. Cosbuc Street, 700470 Iasi, Romania
| | - L Pintilie
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
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