Synthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F17%3A00469851" target="_blank" >RIV/61389013:_____/17:00469851 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.snb.2016.12.121" target="_blank" >http://dx.doi.org/10.1016/j.snb.2016.12.121</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.snb.2016.12.121" target="_blank" >10.1016/j.snb.2016.12.121</a>
Alternative languages
Result language
angličtina
Original language name
Synthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels
Original language description
Temperature-responsive and electrically conductive doubly filled highly porous poly(N-isopropylacrylamide)/SiO2/polyaniline hydrogels were successfully prepared. They contained 2.5–44 wt.% PANI in dry gel and 6 wt.% SiO2 in the PANI-free part of the dry gel. These materials are of interest as potential actuators (generating movement or pressure change), because of their ultra-fast volume changes, which can be triggered by ohmic- or by induction heating (remote triggering in the latter case), as well as in the function of electrical switches controlled by heating/cooling (shrinking and expanding conductive element). The prepared doubly filled porous gels display reversible and symmetrical response to temperature jumps as fast as 6 s for 75% of the swelling change, and conductivities as high as 74 000 mu S/cm. After testing several synthesis approaches, an efficient two-step route was developed, consisting in the impregnation of porous PNIPAm/SiO2 precursor gels with PANI precursors, which led to a highly selective PANI incorporation into the pore walls (as sub-micrometre-sized irregular and branched filaments). The incorporation of the ‘first filler’, nano-SiO2, was crucial in the developed synthesis, which required an ultra-fast T-responsivity of the PANI-free precursor gel. In order to achieve optimal conductivities, the PANI filler was reduced to the emeraldine form using SnCl2. Conductivity measurements indicated, that PANI percolation is approached near 20 wt.%, and achieved between 20 and 44 wt.%. At such loadings, PANI also acts as a distinct mechanical reinforcement in the gels.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Sensors and Actuators B - Chemical
ISSN
0925-4005
e-ISSN
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Volume of the periodical
244
Issue of the periodical within the volume
June
Country of publishing house
CH - SWITZERLAND
Number of pages
19
Pages from-to
616-634
UT code for WoS article
000395963300071
EID of the result in the Scopus database
2-s2.0-85009083411