Smart Thermomechanochemical Composite Materials Driven by Different Forms of Electromagnetic Radiation
| Autor: | Claudia R. Rivarola, Romina Andrea Gramaglia, Silvestre Bongiovanni Abel, Maria Molina, Diego F. Acevedo, Cesar A. Barbero, Rebeca Edith Rivero, María Victoria Martinez, Kevin Sebastián Riberi, Emma Antonia Cuello |
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| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
Materials science Photon ELECTROMAGNETIC RADIATION product composites THERMOSENSITIVE HYDROGEL 02 engineering and technology 010402 general chemistry Smart material electromagnetic radiation lcsh:Technology 01 natural sciences Electromagnetic radiation chemistry.chemical_compound Polyaniline thermosensitive hydrogel PRODUCT COMPOSITES conducting polymer Composite material lcsh:Science Absorption (electromagnetic radiation) Engineering (miscellaneous) Conductive polymer Nanocomposite lcsh:T CONDUCTING POLYMER 021001 nanoscience & nanotechnology 0104 chemical sciences SMART MATERIALS purl.org/becyt/ford/2 [https] chemistry smart materials Ceramics and Composites lcsh:Q purl.org/becyt/ford/2.5 [https] 0210 nano-technology |
| Zdroj: | Journal of Composites Science, Vol 4, Iss 1, p 3 (2020) Journal of Composites Science Volume 4 Issue 1 CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 2504-477X |
| Popis: | Photo-thermo-mechanochemical (P-T-MCh) nanocomposites provide a mechanical and/or chemical output (MCh) in response to a photonic (P) input, with the thermal (T) flux being the coupling factor. The nanocomposite combines a photon absorbing nanomaterial with a thermosensitive hydrogel matrix. Conjugated (absorbing in the near infrared (NIR, 750&ndash 850 nm) wavelength range) polymer (polyaniline, PANI) nanostructures are dispersed in cross-linked thermosensitive (poly(N-isopropylacrylamide), PNIPAM) hydrogel matrices, giving the nanocomposite P-T-MCh properties. Since PANI is a conductive polymer, electromagnetic radiation (ER) such as radiofrequency (30 kHz) and microwaves (2.4 GHz) could also be used as an input. The alternating electromagnetic field creates eddy currents in the PANI, which produces heat through the Joule effect. A new kind of &ldquo product&rdquo nanocomposite is then produced, where ER drives the mechanochemical properties of the material through thermal coupling (electromagnetic radiation thermomechanochemical, ER-T-MCh). Both optical absorption and conductivity of PANI depend on its oxidation and protonation state. Therefore, the ER-T-MCh materials are able to react to the surroundings properties (pH, redox potential) becoming a smart (electromagnetic radiation thermomechanochemical) (sER-T-MCh material. The volume changes of the sER-T-MCh materials are reversible since the size and shape is recovered by cooling. No noticeable damage was observed after several cycles. The mechanical properties of the composite materials can be set by changing the hydrogel matrix. Four methods of material fabrication are described. |
| Databáze: | OpenAIRE |
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