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Melo DS, Reis IC, Queiroz JC, Cena CR, Nahime BO, Malmonge JA, Silva MJ. Evaluation of Piezoresistive and Electrical Properties of Conductive Nanocomposite Based on Castor-Oil Polyurethane Filled with MWCNT and Carbon Black. Materials (Basel) 2023; 16:3223. [PMID: 37110058 PMCID: PMC10143113 DOI: 10.3390/ma16083223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 03/17/2023] [Accepted: 03/20/2023] [Indexed: 06/19/2023]
Abstract
Flexible films of a conductive polymer nanocomposite-based castor oil polyurethane (PUR), filled with different concentrations of carbon black (CB) nanoparticles or multiwall carbon nanotubes (MWCNTs), were obtained by a casting method. The piezoresistive, electrical, and dielectric properties of the PUR/MWCNT and PUR/CB composites were compared. The dc electrical conductivity of both PUR/MWCNT and PUR/CB nanocomposites exhibited strong dependences on the concentration of conducting nanofillers. Their percolation thresholds were 1.56 and 1.5 mass%, respectively. Above the threshold percolation level, the electrical conductivity value increased from 1.65 × 10-12 for the matrix PUR to 2.3 × 10-3 and 1.24 × 10-5 S/m for PUR/MWCNT and PUR/CB samples, respectively. Due to the better CB dispersion in the PUR matrix, the PUR/CB nanocomposite exhibited a lower percolation threshold value, corroborated by scanning electron microscopy images. The real part of the alternating conductivity of the nanocomposites was in accordance with Jonscher's law, indicating that conduction occurred by hopping between states in the conducting nanofillers. The piezoresistive properties were investigated under tensile cycles. The nanocomposites exhibited piezoresistive responses and, thus, could be used as piezoresistive sensors.
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Affiliation(s)
- Diego S. Melo
- Department of Physics and Chemistry, Faculty of Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil
- Department of Energy Engineering, Faculty of Engineering and Science, São Paulo State University (UNESP), Rosana 19274-000, SP, Brazil
| | - Idalci C. Reis
- Science and Technology Goiano, Federal Institute of Education, Rio Verde 75901-970, GO, Brazil
| | - Júlio C. Queiroz
- Science and Technology Goiano, Federal Institute of Education, Rio Verde 75901-970, GO, Brazil
| | - Cicero R. Cena
- Institute of Physics, Federal University of Federal do Mato Grosso do Sul (UFMS), Campo Grande 79070-900, MS, Brazil
| | - Bacus O. Nahime
- Science and Technology Goiano, Federal Institute of Education, Rio Verde 75901-970, GO, Brazil
| | - José A. Malmonge
- Department of Physics and Chemistry, Faculty of Engineering, São Paulo State University (UNESP), Ilha Solteira 15385-000, SP, Brazil
| | - Michael J. Silva
- Department of Energy Engineering, Faculty of Engineering and Science, São Paulo State University (UNESP), Rosana 19274-000, SP, Brazil
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Freire Filho FCM, Santos JA, Sanches AO, Medeiros ES, Malmonge JA, Silva MJ. Dielectric, electric, and piezoelectric properties of three‐phase piezoelectric composite based on castor‐oil polyurethane, lead zirconate titanate particles and multiwall carbon nanotubes. J Appl Polym Sci 2023. [DOI: 10.1002/app.53572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | - Josiane A. Santos
- Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Ilha Solteira Brazil
| | - Alex O. Sanches
- Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Ilha Solteira Brazil
| | - Eliton S. Medeiros
- Laboratory of Materials and Biosystems (LAMAB) Universidade Federal da Paraíba (UFPB), Departamento de Engenharia de Materiais João Pessoa Brazil
| | - José A. Malmonge
- Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Ilha Solteira Brazil
| | - Michael J. Silva
- Faculdade de Engenharia e Ciência Universidade Estadual Paulista (UNESP) Rosana Brazil
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Sanches AO, Silva MJ, Malmonge LF, Basso NRS, Malmonge JA. Tuning piezoelectric properties in elastomeric polyurethane nanocomposites utilizing cellulose nanocrystals. J Appl Polym Sci 2021. [DOI: 10.1002/app.50865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Alex O. Sanches
- Universidade Estadual Paulista (UNESP), Faculdade de Engenharia, Câmpus de Ilha Solteira Ilha Solteira Brazil
| | - Michael J. Silva
- Universidade Estadual Paulista (UNESP), Câmpus Experimental de Rosana São Paulo Brazil
| | - Luiz F. Malmonge
- Universidade Estadual Paulista (UNESP), Faculdade de Engenharia, Câmpus de Ilha Solteira Ilha Solteira Brazil
| | - Nara R. S. Basso
- Escola de Ciências, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS) Porto Alegre Brazil
| | - José A. Malmonge
- Universidade Estadual Paulista (UNESP), Faculdade de Engenharia, Câmpus de Ilha Solteira Ilha Solteira Brazil
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Silva MJ, Sanches AO, Malmonge LF, Medeiros ES, Rosa MF, McMahan CM, Malmonge JA. Conductive Nanocomposites Based on Cellulose Nanofibrils Coated with Polyaniline-DBSA ViaIn SituPolymerization. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/masy.201100156] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Compósitos de borracha natural (Hevea brasiliensis)-BN/polianilina - PANI, com diferentes composições foram obtidos através da polimerização por emulsão do monômero anilina na presença da BN e do ácido dodecilbenzeno sulfônico (DBSA). Filmes finos e homogêneos foram obtidos por prensagem a quente. Os compósitos foram caracterizados por condutividade elétrica, FTIR, UV-vis-NIR, DSC e difração de raios X. Compósito com condutividade elétrica cerca de 14 ordens de grandeza maior que a BN foi obtido. Este alto valor de condutividade é atribuído à formação da PANI no estado dopado no compósito, que foi verificado através das técnicas de UV-vis-NIR e FTIR. Os resultados obtidos com a técnica de DSC e difratometria de raios X indicaram que os polímeros são imiscíveis e que a presença da borracha não altera significantemente a fase cristalina da PANI-DBSA no compósito.
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Alves WF, Kanda DHF, Malmonge LF, Malmonge JA, Mattoso LHC. Preparation and characterization of castor oil-based polyurethane/poly(o-methoxyaniline) blend film. J Appl Polym Sci 2007. [DOI: 10.1002/app.26075] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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de Paula MH, de Carvalho AA, Brassalotti AL, Alter AJ, Sakamoto WK, Malmonge JA, de Almeida A. Microcontrolled pyro-electric instrument for measuring X-ray intensity in mammography. Med Biol Eng Comput 2005; 43:751-5. [PMID: 16594302 DOI: 10.1007/bf02430953] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A novel instrument for measurement of X-ray intensity from mammography consists of a sensitive pyro-electric detector, a high-sensitivity, low-noise current-to-voltage converter, a microcontroller and a digital display. The heart of this device, and what makes it unique is the pyro-electric detector, which measures radiation by converting heat from absorbed incident X-rays into an electric current. This current is then converted to a voltage and digitised. The detector consists of a ferro-electric crystal; two types were tested: lithium tantalate and lithium niobate. X-ray measurement in mammography is challenging because of its relatively low photon energy range, from 11 keV to 15 keV equivalent mean energy, corresponding to a peak tube potential from 22 to 36 kV. Consequently, energy fluence rate or intensity is low compared with that of common diagnostic X-ray. The instrument is capable of measuring intensities as low as 0.25 mW m(-2) with precision greater than 99%. Not only was the instrument capable of performing in the clinical environment, with high background electromagnetic interference and vibration, but its performance was not degraded after being subjected to 140 roentgen (3.6 x 10(-2) C kg(-2) air) as measured by piezo-electric (d33) or pyro-electric coefficients.
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Affiliation(s)
- M H de Paula
- Department of Physics, Federal University of Mato Grosso do Sul, Brazil
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