Synthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Synthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Synthesis of conductive doubly filled poly(N-isopropylacrylamide)-polyaniline-SiO2 hydrogels

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Sensors and Actuators B - Chemical

ISSN

0925-4005

e-ISSN

—

Svazek periodika

244

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

19

Strana od-do

616-634

Kód UT WoS článku

000395963300071

EID výsledku v databázi Scopus

2-s2.0-85009083411