Reduction of silver ions to silver with polyaniline/poly(vinyl alcohol) cryogels and aerogels

0490816 - ÚMCH 2019 RIV SK eng J - Článek v odborném periodiku
Bober, Patrycja - Trchová, Miroslava - Kovářová, Jana - Acharya, Udit - Hromádková, Jiřina - Stejskal, Jaroslav
Reduction of silver ions to silver with polyaniline/poly(vinyl alcohol) cryogels and aerogels.
Chemical Papers. Roč. 72, č. 7 (2018), s. 1619-1628. ISSN 0366-6352
Grant CEP: GA ČR(CZ) GA16-02787S
Institucionální podpora: RVO:61389013
Klíčová slova: conducting polymer * polyaniline * cryogel
Obor OECD: Polymer science
Impakt faktor: 1.246, rok: 2018

The macroporous conducting polymer cryogels were prepared by the oxidation of aniline hydrochloride in the frozen aqueous solutions of poly(vinyl alcohol) at − 24 °C. Corresponding polyaniline aerogels supported with poly(vinyl alcohol) have been obtained after thawing of cryogels followed by freeze-drying. Silver was deposited on the composites using the ability of polyaniline to reduce silver ions after the immersion in silver nitrate solutions. Swollen cryogels were coated only on the surface with macroscopic silver particles due to the closed-pore structure in cryogels and limited penetration of silver ions into macropores. The diffusion of silver ions to freeze-dried aerogels was better and further improved by vacuum treatment. Silver microcubes were produced in the pores, the weight fraction of silver in dry composites being typically several per cent, a maximum 13 wt%. The conductivity of the aerogels compressed to pellets depended on the processing and the highest value was 0.27 S cm−1. The aerogels containing silver were characterized in detail with Raman spectroscopy.
Trvalý link: http://hdl.handle.net/11104/0284954