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Baibarac M, Nila A, Smaranda I, Stroe M, Stingescu L, Cristea M, Cercel RC, Lorinczi A, Ganea P, Mercioniu I, Ciobanu R, Schreiner C, Garcia RG, Bartha C. Optical, Structural, and Dielectric Properties of Composites Based on Thermoplastic Polymers of the Polyolefin and Polyurethane Type and BaTiO 3 Nanoparticles. MATERIALS 2021; 14:ma14040753. [PMID: 33562686 PMCID: PMC7915712 DOI: 10.3390/ma14040753] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/31/2021] [Accepted: 02/01/2021] [Indexed: 11/16/2022]
Abstract
In this work, new films containing composite materials based on blends of thermoplastic polymers of the polyurethane (TPU) and polyolefin (TPO) type, in the absence and presence of BaTiO3 nanoparticles (NPs) with the size smaller 100 nm, were prepared. The vibrational properties of the free films depending on the weight ratio of the two thermoplastic polymers were studied. Our results demonstrate that these films are optically active, with strong, broad, and adjustable photoluminescence by varying the amount of TPU. The crystalline structure of BaTiO3 and the influence of thermoplastic polymers on the crystallization process of these inorganic NPs were determined by X-ray diffraction (XRD) studies. The vibrational changes induced in the thermoplastic polymer's matrix of the BaTiO3 NPs were showcased by Raman scattering and FTIR spectroscopy. The incorporation of BaTiO3 NPs in the matrix of thermoplastic elastomers revealed the shift dependence of the photoluminescence (PL) band depending on the BaTiO3 NP concentration, which was capable of covering a wide visible spectral range. The dependencies of the dielectric relaxation phenomena with the weight of BaTiO3 NPs in thermoplastic polymers blends were also demonstrated.
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Affiliation(s)
- M. Baibarac
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
- Correspondence: ; Tel.: +40-21-3690170
| | - A. Nila
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - I. Smaranda
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - M. Stroe
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - L. Stingescu
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - M. Cristea
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - R. C. Cercel
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - A. Lorinczi
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - P. Ganea
- National Institute of Materials Physics, Laboratory of Optical Processes in Nanostructured Materials, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania; (A.N.); (I.S.); (M.S.); (L.S.); (M.C.); (R.C.C.); (A.L.); (P.G.)
| | - I. Mercioniu
- National Institute of Materials Physics, Atomic Structures and Defects in Advanced Materials Laboratory, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania;
| | - R. Ciobanu
- SC All Green SRL, 8 George Cosbuc, 700470 Iasi, Romania; (R.C.); (C.S.)
- Faculty of Electrical Engineering, Department of Electrical Measurements and Materials, Technical University Gh. Asachi Iasi, Bd. Professor Dimitrie Mangeron 67, 70050 Iasi, Romania
| | - C. Schreiner
- SC All Green SRL, 8 George Cosbuc, 700470 Iasi, Romania; (R.C.); (C.S.)
- Faculty of Electrical Engineering, Department of Electrical Measurements and Materials, Technical University Gh. Asachi Iasi, Bd. Professor Dimitrie Mangeron 67, 70050 Iasi, Romania
| | - R. G. Garcia
- Izertis, Parque Cientifico Tecnologico, Avda. Del Jardin Botanico, 1345 Edificio Intra, 33203 Gijon, Spain;
| | - C. Bartha
- National Institute of Materials Physics, Magnetism and Superconductivity Laboratory, Atomistilor Street 405A, P.O. Box MG-7, R077125 Bucharest, Romania;
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Maximean DM, Danila O, Almeida PL, Ganea CP. Electrical properties of a liquid crystal dispersed in an electrospun cellulose acetate network. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2018; 9:155-163. [PMID: 29441261 PMCID: PMC5789439 DOI: 10.3762/bjnano.9.18] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 12/18/2017] [Indexed: 05/27/2023]
Abstract
Electro-optical devices that work in a similar fashion as PDLCs (polymer-dispersed liquid crystals), produced from cellulose acetate (CA) electrospun fibers deposited onto indium tin oxide coated glass and a nematic liquid crystal (E7), were studied. CA and the CA/liquid crystal composite were characterized by multiple investigation techniques, such as polarized optical microscopy, dielectric spectroscopy and impedance measurements. Dielectric constant and electric energy loss were studied as a function of frequency and temperature. The activation energy was evaluated and the relaxation time was obtained by fitting the spectra of the dielectric loss with the Havriliak-Negami functions. To determine the electrical characteristics of the studied samples, impedance measurements results were treated using the Cole-Cole diagram and the three-element equivalent model.
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Affiliation(s)
- Doina Manaila Maximean
- University Politehnica of Bucharest, Department of Physics, 313 Spl. Independentei, 060042, Bucharest, Romania
| | - Octavian Danila
- University Politehnica of Bucharest, Department of Physics, 313 Spl. Independentei, 060042, Bucharest, Romania
| | - Pedro L Almeida
- I3N - CENIMAT, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT/UNL, 2829-516 Caparica, Portugal
- Área Departamental de Física, ISEL, Instituto Superior de Engenharia de Lisboa, I.P.L., R. Conselheiro Emídio Navarro, 1959-007 Lisboa, Portugal
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