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Stalmann G, Matic A, Jacobsson P, Tranchida D, Gitsas A, Gkourmpis T. Crystallisation Kinetics and Associated Electrical Conductivity Dynamics of Poly(Ethylene Vinyl Acetate) Nanocomposites in the Melt State. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3602. [PMID: 36296791 PMCID: PMC9612297 DOI: 10.3390/nano12203602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/06/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
Nanocomposite systems comprised of a poly(ethylene vinyl acetate) (EVA) matrix and carbon black (CB) or graphene nanoplatelets (GNPs) were used to investigate conductivity and crystallisation dynamics using a commercially relevant melt-state mixing process. Crystallisation kinetics and morphology, as investigated by DSC and SEM, turn out to depend on the interplay of (i) the interphase interactions between matrix and filler, and (ii) the degree of filler agglomeration. For the GNP-based systems, an almost constant conductivity value was observed for all compositions upon cooling, something not observed for the CB-based compositions. These conductivity changes reflect structural and morphological changes that can be associated with positive and negative thermal expansion coefficients. GNP-based systems were observed to exhibit a percolation threshold of approximately 2.2 vol%, lower than the 4.4 vol% observed for the CB-based systems.
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Affiliation(s)
- Gertrud Stalmann
- Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
- Department of Physics, University of Gothemburg, 405 30 Göteborg, Sweden
- Department of Physics, Philipps-Universität Marburg, 35037 Marburg, Germany
| | - Aleksandar Matic
- Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Per Jacobsson
- Department of Applied Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Davide Tranchida
- Innovation & Technology, Borealis Polyolefine GmbH, 4021 Linz, Austria
| | - Antonis Gitsas
- Innovation & Technology, Borealis Polyolefine GmbH, 4021 Linz, Austria
| | - Thomas Gkourmpis
- Innovation & Technology, Borealis AB, 444 86 Stenungsund, Sweden
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2
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Favero D, Marcon V, Agnol LD, Gómez CM, Cros A, Garro N, Sanchis MJ, Carsí M, Figueroa CA, Bianchi O. Effect of chain extenders on the hydrolytic degradation of soybean polyurethane. J Appl Polym Sci 2022. [DOI: 10.1002/app.52623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Diana Favero
- Postgraduate Program in Materials Science and Engineering (PGMAT) University of Caxias do Sul (UCS) Caxias do Sul Rio Grande do Sul Brazil
| | - Victória Marcon
- Postgraduate Program in Materials Science and Engineering (PGMAT) University of Caxias do Sul (UCS) Caxias do Sul Rio Grande do Sul Brazil
| | - Lucas Dall Agnol
- Postgraduate Program in Materials Science and Engineering (PGMAT) University of Caxias do Sul (UCS) Caxias do Sul Rio Grande do Sul Brazil
| | - Clara M. Gómez
- Instituto de Ciencia de los Materiales Universidad de Valencia València Spain
| | - Ana Cros
- Instituto de Ciencia de los Materiales Universidad de Valencia València Spain
| | - Nuria Garro
- Instituto de Ciencia de los Materiales Universidad de Valencia València Spain
| | - Maria J. Sanchis
- Department of Applied Thermodynamics, Institute of Electric Technology Universitat Politècnica de València Valencia Spain
| | - Marta Carsí
- Department of Applied Thermodynamics, Instituto de Automática e Informática Industrial Universitat Politècnica de Valencia Valencia Spain
| | - Carlos A. Figueroa
- Postgraduate Program in Materials Science and Engineering (PGMAT) University of Caxias do Sul (UCS) Caxias do Sul Rio Grande do Sul Brazil
| | - Otávio Bianchi
- Postgraduate Program in Materials Science and Engineering (PGMAT) University of Caxias do Sul (UCS) Caxias do Sul Rio Grande do Sul Brazil
- Department of Materials Engineering (DEMAT) Federal University of Rio Grande do Sul (UFRGS) Porto Alegre Rio Grande do Sul Brazil
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3
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Manna R, Kumar Srivastava S, Mittal V. Fabrication of High Dielectric Materials Through Selective Insertion of Functionalized Reduced Graphene Oxide on Hard Segment of Thermoplastic Polyurethane. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2021; 21:5569-5582. [PMID: 33980366 DOI: 10.1166/jnn.2021.19468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The presence of microcapacitors near percolatrion threshold determines dielectric permittivity of a material. Motivated by this concept, we focused our work by preferentially allocating functionalized reduced graphene oxide (FRGO) in hard segment (disperse phase) of Thermoplastic polyurethane (TPU) by solution blending method and characterized. Morphological studies of TPU/FRGO nanocomposites established homogeneous dispersion of FRGO throughout the TPU matrix. It is noted that TPU/FRGO (1 phr) nanocomposites exhibit maximum increase in tensile strength (33%) and elongation at break (10%). Thermogravimetric analysis (TGA) showed maximum enhancement in onset of decomposition temperature (~6 °C) in 2 phr FRGO loaded TPU. Differential scanning calorimetry (DSC) analysis showed maximum reduction (~2 °C) in glass transition temperature (Tg) of soft segment of TPU followed by maximum improvements in melting temperature (~4 °C) as well as crystallization temperature (~22 °C) of hard segment compared to neat TPU. Further, a significantly high value of dielectric permittivity (401) is achieved in 1.5 phr loaded FRGO at 100 Hz due to the formation of significantly higher number of microcapacitors near the percolation threshold. It is anticipated that such thermally stable and mechanically strong high dielectric TPU/FRGO nanocomposites can find applications in the field of electronic devices.
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Affiliation(s)
- Rakesh Manna
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | | | - Vikas Mittal
- Department of Chemical Engineering, Khalifa University of Science and Technology (KUST), Sas Al Nakh! Campus, Abu Dhabi, P.O. 2533, United Arab Emirates
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4
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Serrano-Claumarchirant JF, Brotons-Alcázar I, Culebras M, Sanchis MJ, Cantarero A, Muñoz-Espí R, Gómez CM. Electrochemical Synthesis of an Organic Thermoelectric Power Generator. ACS APPLIED MATERIALS & INTERFACES 2020; 12:46348-46356. [PMID: 32965099 DOI: 10.1021/acsami.0c12076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Energy harvesting through residual heat is considered one of the most promising ways to power wearable devices. In this work, thermoelectric textiles were prepared by coating the fabrics, first with multiple-wall carbon nanotubes (MWCNTs) by using the layer-by-layer technique and second with poly(3,4-ethylenedioxythiophene) (PEDOT) deposited by electrochemical polymerization. Sodium deoxycholate and poly(diallyldimethylammonium chloride) were used as stabilizers to prepare the aqueous dispersions of MWCNTs. The electrochemical deposition of PEDOT on the MWCNT-coated fabric was carried out in a three-electrode electrochemical cell. The polymerization of PEDOT on the fabric increased the electrical conductivity by ten orders of magnitude (through the plane), establishing an excellent path for electric transport across the fabrics. In addition, the fibers showed a Seebeck coefficient of 14.3 μV K-1, which is characteristic of highly doped PEDOT. As a proof of concept, several thermoelectric modules were made with different elements based on the coated acrylic and cotton fabrics. The best generator made of 30 thermoelectric elements using acrylic fabrics exhibited an output power of 0.9 μW with a temperature difference of 31 K.
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Affiliation(s)
| | - Isaac Brotons-Alcázar
- Institute of Molecular Science (ICMol), Universitat de València, c/Catedràtic José Beltrán 2, 46980 Paterna, Spain
| | - Mario Culebras
- Stokes Laboratories, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland
| | - Maria J Sanchis
- Department of Applied Thermodynamics, Institute of Electrical Technology (ITE), Universitat Politècnica de València, 46022 Valencia, Spain
| | - Andrés Cantarero
- Institute of Molecular Science (ICMol), Universitat de València, c/Catedràtic José Beltrán 2, 46980 Paterna, Spain
| | - Rafael Muñoz-Espí
- Institute of Materials Science (ICMUV), Universitat de València, c/Catedràtic José Beltrán 2, 46980 Paterna, Spain
| | - Clara M Gómez
- Institute of Materials Science (ICMUV), Universitat de València, c/Catedràtic José Beltrán 2, 46980 Paterna, Spain
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Thampi S, Thekkuveettil A, Muthuvijayan V, Parameswaran R. Accelerated Outgrowth of Neurites on Graphene Oxide-Based Hybrid Electrospun Fibro-Porous Polymeric Substrates. ACS APPLIED BIO MATERIALS 2020; 3:2160-2169. [PMID: 35025267 DOI: 10.1021/acsabm.0c00026] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Fabrication of a surface-engineered electrospun scaffold having biomimetic properties like the extracellular matrix (ECM) is essential for neural tissue engineering. An electroconductive and elastomeric scaffold with aligned fibers acting as a substrate may have a great impact on the directional outgrowth of neurites. In this study, we have electrospun electrically conductive, polyurethane-based elastomeric and topographically aligned fibro-porous neural scaffolds. Adhesive proteins of the ECM are documented to have an important role in controlling neuronal cell behavior, including cell adhesion, proliferation, and neurite outgrowth. These bio-adhesion proteins or nanomaterials mimicking their action, if used for surface modification of neural scaffolds, may have the potential to accelerate the nerve repair process. Thus, electrospun scaffolds fabricated were surface-engineered using a unique and modified single-step electrospraying technique to coat the scaffold surface with an exploratory bio-adhesion agent, a thin layer of graphene oxide (GO) films. The study was then carried out to determine if the GO-coated electrospun electroconductive polycarbonate urethane (PCU) substrate can improve the bio-interface attributes of these scaffolds or may alter the neurite outgrowth of PC-12 cells like any other bio-adhesion proteins. Therefore, the hybrid scaffolds with GO coatings were compared with similar scaffolds coated with poly-l-lysine (PLL) for neural cell adhesion, proliferation, and neurite extension. Neurite outgrowth studies showed that although the average neurite length was comparable on both GO- and PLL-coated surfaces, the length profile of neurites, when categorized based on length, showed an increased number of lengthier neurites on the GO-coated hybrid scaffolds. In particular, the study brings out an innovative surface engineering technique for the coating of GO on polymeric scaffolds. It may be further put together in designing of hybrid surfaces with nanotopographical biophysical cues on three-dimensional neural scaffolds, which in turn may stimulate an accelerated neuronal regeneration via providing an enhanced ECM like milieu.
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Affiliation(s)
- Sudhin Thampi
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India.,Division of Polymeric Medical Devices, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram 695012, India
| | - Anoopkumar Thekkuveettil
- Division of Molecular Medicine, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram 695012, India
| | - Vignesh Muthuvijayan
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
| | - Ramesh Parameswaran
- Division of Polymeric Medical Devices, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram 695012, India
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Exploitation of the hard/soft segments ratio in thermoplastic polyurethane (TPU) for the tuning of electrical and mechanical properties of expanded graphite (EG) based composites. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0908-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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7
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Favero D, Marcon VR, Barcellos T, Gómez CM, Sanchis MJ, Carsí M, Figueroa CA, Bianchi O. Renewable polyol obtained by microwave-assisted alcoholysis of epoxidized soybean oil: Preparation, thermal properties and relaxation process. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.078] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Pang X, Xin Y, Shi X, Xu J. Effect of different size‐modified expandable graphite and ammonium polyphosphate on the flame retardancy, thermal stability, physical, and mechanical properties of rigid polyurethane foam. POLYM ENG SCI 2019. [DOI: 10.1002/pen.25123] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Xiu‐Yan Pang
- College of Chemistry and Environmental ScienceHebei University Baoding 071002 China
- Flame Retardant Material and Processing Technology Engineering Technology Research Center of Hebei Province, Key Laboratory of Analytical Science and Technology of Hebei ProvinceHebei University Baoding 071002 China
| | - Ya‐Ping Xin
- College of Chemistry and Environmental ScienceHebei University Baoding 071002 China
| | - Xiu‐Zhu Shi
- College of Chemistry and Environmental ScienceHebei University Baoding 071002 China
| | - Jian‐Zhong Xu
- College of Chemistry and Environmental ScienceHebei University Baoding 071002 China
- Flame Retardant Material and Processing Technology Engineering Technology Research Center of Hebei Province, Key Laboratory of Analytical Science and Technology of Hebei ProvinceHebei University Baoding 071002 China
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Suen MC, Gu JH, Lee HT, Wu CL, Liao CS, Yang JJ. In situ polymerisation and characteristic properties of the waterborne graphene oxide/poly(siloxane-urethane)s nanocomposites. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-1990-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Sanchis MJ, Carsí M, Gracia-Fernández CA. Thermal and dielectric characterization of multi-walled carbon nanotubes−thermoplastic polyurethanes composites. POLYMER SCIENCE SERIES A 2017. [DOI: 10.1134/s0965545x17040083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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He Y, Li W, Yang G, Liu H, Lu J, Zheng T, Li X. A Novel Method for Fabricating Wearable, Piezoresistive, and Pressure Sensors Based on Modified-Graphite/Polyurethane Composite Films. MATERIALS 2017; 10:ma10070684. [PMID: 28773047 PMCID: PMC5551727 DOI: 10.3390/ma10070684] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 06/05/2017] [Accepted: 06/14/2017] [Indexed: 11/26/2022]
Abstract
A wearable, low-cost, highly repeatable piezoresistive sensor was fabricated by the synthesis of modified-graphite and polyurethane (PU) composites and polydimethylsiloxane (PDMS). Graphite sheets functionalized by using a silane coupling agent (KH550) were distributed in PU/N,N-dimethylformamide (DMF) solution, which were then molded to modified-graphite/PU (MG/PU) composite films. Experimental results show that with increasing modified-graphite content, the tensile strength of the MG/PU films first increased and then decreased, and the elongation at break of the composite films showed a decreasing trend. The electrical conductivity of the composite films can be influenced by filler modification and concentration, and the percolation threshold of MG/PU was 28.03 wt %. Under liner uniaxial compression, the 30 wt % MG/PU composite films exhibited 0.274 kPa−1 piezoresistive sensitivity within the range of low pressure, and possessed better stability and hysteresis. The flexible MG/PU composite piezoresistive sensors have great potential for body motion, wearable devices for human healthcare, and garment pressure testing.
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Affiliation(s)
- Yin He
- School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
- Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
- School of Art and Fashion, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Wei Li
- School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Guilin Yang
- School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Hao Liu
- School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
- Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
- Key Laboratory of Advanced Textile Composite Materials, Ministry of Education of China, Tianjin 300387, China.
| | - Junyu Lu
- School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Tongtong Zheng
- School of Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Xiaojiu Li
- Institute of Smart Wearable Electronic Textiles, Tianjin Polytechnic University, Tianjin 300387, China.
- School of Art and Fashion, Tianjin Polytechnic University, Tianjin 300387, China.
- Key Laboratory of Advanced Textile Composite Materials, Ministry of Education of China, Tianjin 300387, China.
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12
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Thampi S, Nandkumar AM, Muthuvijayan V, Parameswaran R. Differential Adhesive and Bioactive Properties of the Polymeric Surface Coated with Graphene Oxide Thin Film. ACS APPLIED MATERIALS & INTERFACES 2017; 9:4498-4508. [PMID: 28090771 DOI: 10.1021/acsami.6b14863] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Surface engineering of implantable devices involving polymeric biomaterials has become an essential aspect for medical implants. A surface enhancement technique can provide an array of unique surface properties that improve its biocompatibility and functionality as an implant. Polyurethane-based implants that have found extensively acclaimed usage as an implant in biomedical applications, especially in the area of cardiovascular devices, still lack any mechanism to ward off bacterial or platelet adhesion. To bring out such a defense mechanism we are proposing a surface modification technique. Graphene oxide (GO) in very thin film form was wrapped onto the electrospun fibroporous polycarbonate urethane (PCU) membrane (GOPCU) by a simple method of electrospraying. In the present study, we have developed a simple single-step method for coating a polymeric substrate with a thin GO film and evaluated the novel antiadhesive activity of these films. SEM micrographs after coating showed the presence of very thin GO films over the PCU membrane. On the GOPCU surface, the contact angle was shifted by ∼30°, making the hydrophobic PCU surface slightly hydrophilic, while Raman spectral characterization and mapping showed the presence and distribution of GO over 75% of the membrane. A reduced platelet adhesion on the GOPCU surface was observed; meanwhile, bacterial adhesion also got reduced by 85% for Staphylococcus aureus (Gram positive, cocci) and 64% for Pseudomonas aeruginosa (Gram negative, bacilli). A cell adhesion study conducted using mammalian fibroblast cells projected its proliferation percentage in a MTT assay, with 82% cell survival on PCU and 86% on GOPCU after 24 h culture, while a study for an extended period of 72 h showed 87% of survival on PCU and 88% on GOPCU. This plethora of functionalities by a simple modification technique makes thin GO films a self-sufficient surface engineering material for future biomedical applications.
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Affiliation(s)
- Sudhin Thampi
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras , Chennai 600036, India
| | | | - Vignesh Muthuvijayan
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras , Chennai 600036, India
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Rzayev ZM, Salimi K, Bunyatova U, Acar S, Salamov B, Turk M. Fabrication and characterization of PVA/ODA-MMT-poly(MA-alt-1-octadecene)-g-graphene oxide e-spun nanofiber electrolytes and their response to bone cancer cells. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 61:257-68. [DOI: 10.1016/j.msec.2015.12.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 11/17/2015] [Accepted: 12/18/2015] [Indexed: 10/22/2022]
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14
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Sanchis MJ, Redondo-Foj B, Carsí M, Ortiz-Serna P, Culebras M, Gómez CM, Cantarero A, Muñoz-Espí R. Controlling dielectrical properties of polymer blends through defined PEDOT nanostructures. RSC Adv 2016. [DOI: 10.1039/c6ra05597d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The paper reports the crucial role of the morphology of poly(3,4-ethylenedioxythiophene) (PEDOT) nanostructures on the thermal and dielectric properties of polymer blends prepared thereof.
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Affiliation(s)
- Maria J. Sanchis
- Departamento de Termodinámica Aplicada
- E.T.S.I.I
- Instituto de Tecnología Eléctrica Universitat Politècnica de Valencia
- 46022 Valencia
- Spain
| | - Belén Redondo-Foj
- Departamento de Termodinámica Aplicada
- E.T.S.I.I
- Instituto de Tecnología Eléctrica Universitat Politècnica de Valencia
- 46022 Valencia
- Spain
| | - Marta Carsí
- Instituto de Automática e Informática Industrial
- Universitat Politècnica de Valencia
- 46022 Valencia
- Spain
| | - Pilar Ortiz-Serna
- Departamento de Termodinámica Aplicada
- E.T.S.I.I
- Instituto de Tecnología Eléctrica Universitat Politècnica de Valencia
- 46022 Valencia
- Spain
| | - Mario Culebras
- Institute of Materials Science (ICMUV)
- University of Valencia
- 46071 Valencia
- Spain
| | - Clara M. Gómez
- Institute of Materials Science (ICMUV)
- University of Valencia
- 46071 Valencia
- Spain
| | - Andrés Cantarero
- Institute of Materials Science (ICMUV)
- University of Valencia
- 46071 Valencia
- Spain
| | - Rafael Muñoz-Espí
- Institute of Materials Science (ICMUV)
- University of Valencia
- 46071 Valencia
- Spain
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