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

SYSNO ASEP	0490816
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Reduction of silver ions to silver with polyaniline/poly(vinyl alcohol) cryogels and aerogels
Author(s)	Bober, Patrycja (UMCH-V)_{RID, ORCID, SAI} Trchová, Miroslava (UMCH-V)_{RID, ORCID} Kovářová, Jana (UMCH-V)_RID Acharya, Udit (UMCH-V)_{RID, ORCID} Hromádková, Jiřina (UMCH-V)_RID Stejskal, Jaroslav (UMCH-V)_{RID, ORCID, SAI}
Source Title	Chemical Papers. - : Springer - ISSN 0366-6352 Roč. 72, č. 7 (2018), s. 1619-1628
Number of pages	10 s.
Language	eng - English
Country	SK - Slovakia
Keywords	conducting polymer ; polyaniline ; cryogel
Subject RIV	CD - Macromolecular Chemistry
OECD category	Polymer science
R&D Projects	GA16-02787S GA ČR - Czech Science Foundation (CSF)
Institutional support	UMCH-V - RVO:61389013
UT WOS	000435829800005
EID SCOPUS	85048809572
DOI	10.1007/s11696-017-0374-6
Annotation	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.
Workplace	Institute of Macromolecular Chemistry
Contact	Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358
Year of Publishing	2019

Number of the records: 1