PANI-silver

In this study [46], poljwinyl alcohol (PVA)/polyaniline (PANI)/silver nanocomposites were tested for antibacterial activity against Escherichia coli and Staphylococcus aureus. The nanocomposite samples resulted in ZOI with diameters of the 7, 8,12, 9 and 8 mm and 10,12,15,9 and 8 mm against Escherichia coli and Staphylococcus aureus, respectively. It was observed that the PVA/PANI composite, which was used as a control matrix, exhibited no antibacterial activity when compared with PVA/ PANI/silver nanocomposites. 

PANI/silver (PANI-Ag) In-situ chemical polymerization Pellet Ethanol [31]... 

Pourabas and Peyghambardoost [53] showed that copper filled epoxy resin composite had electrical conductivity properties. Afzal and co-workers [104] studied the electrical properties of PANI/silver nanocomposites. The silver nanoparticles in PANI reduced the charge trapping centres and increased the conducting channels of the polymer. 

PANES EX PYRITE VEL CADMIA CONFLATI — Stones made of Pyrites or Cadmia. PANIS ARGENTEUS - Silver Plate PANNUS — A Mole or Birthmark. 

Figure 2.12 SEM (left) and TEM (right) of PANI-NEs-Ag composite 0.2 M aniline was oxidized with 0.5 silver nitrate in 0.4 M HNO3. (Reprinted with permission from Polymer, The oxidation of aniline with silver nitrate to polyaniline-silver composites by N. V. Blinova, J. Stejskal, M. Trchova et a ., 50, 1, 50-56. Copyright (2009) Elsevier)...

Miscellaneous Template-Free Methods PANI-NTs, having cavities of various diameters, have been found as by-products of PANI-NF synthesis through the oxidation of aniline with silver nitrate in aqueous solutions of HNO3 [225]. Ag was obtained as nanopartieles accompanying macroscopic Ag flakes in the resulting PANI/Ag composite. 

PANI-NTs are redox active, e.g. reduce silver nitrate to Ag nanoparticles [353], thus forming PANI-NTs/Ag nanocomposites [446]. Granular PANI samples have unimodal moleeular weight distributions, while a bimodal distribution with a characteristic oligoani-line peak is observed for PANI-NTs (Figure 2.29) [377]. 

AgNOjdOOppm) PANI- powder, membranes or coated RVC and fabrics ES Silver recovery 231... 

Figure 7.11 Dependence of the amount of deposited silver (measured through the charge of oxidative dissolution) on the amount ofPANI (measured through the PANI intrinsic oxidation state) at two different concentration ofAg-EDTA solution 10 mM (m) and 0.4 mM (w). (Adapted with permission from S. Ivanov and V. Tsakova, Electroless versus electrodriven deposition of silver crystals in polyaniline Role of silver anion complexes, Electrochim. Acta, 50, 5616-5623 (2005). Copyright 2005 Elsevier.)...

There are no reports about PANI composites with oxides of silver and gold because of the high redox reactivity of these oxides (e.g., Ag O and Au O can oxidize PANI), while PANI composites with copper oxides are known. Electrodeposition of mesoporous bilayers of PANI supported Cu O semiconducting films from lyotropic liquid crystalline phase has recently been reported by Xue et al. [16]. The control of size, morphology, and conductivity of PANI nanofibers (PANI-NFs) in PANI-NFs/CuO nanocomposites (Figure 2.1) was achieved by systematic variation of CuO loadings during the oxidative polymerization of aniline with mixture of oxidants [ammonium peroxydisulfate (APS) and sodium hypochlorite] in an acidic aqueous solution [17]. 

Due to these interactions, a weak electron donation effect occurs through the -OH group to the polymer chain and ultimately the electron flow throughout the polymer chain increases. Like protonic acid-doped PANI and its derivatives the reaction of ammonia molecule with =NH+-groups is difficult due to the steric hindrance of silver nanoparticles and the... 

In the galvanic series, PAni and its blends are positioned right below silver. 

Polyaniline/Silver Nanocomposites He and coworkers [56] employed chronopotentiometry to prepare polyaniline/silver (PANI/Ag) nanocomposite films in water-in-IL and IL-in-water microemnlsions, by simultaneous oxidative polymerization of aniline to PANI and rednction of silver nitrate to Ag nanoparticles. The PANI/ Ag prepared in water-in-IL microemulsion was nanofibrous, and the Ag nanocrystals with 5 nm diameter were dispersed homogeneously, whereas the PANI/Ag prepared in IL-in-water microemulsion exhibited dendritic structure, and the diameter of Ag nanocrystals was 50-100 nm. The special structures of the PANI/Ag nanocomposite resulted in more excellent electrochemical activity than that of the pure PANI. 

As mentioned earlier in situ approach has also been used for the synthesis of conducting polymer-metal hybrid nanocomposites. Xu et al. [35] have reported the decoration of PPy nanotubes with gold nanoparticles by an in situ reduction process. They prepared PPy nanotubes by MO-FeCl3 self-degrade template method and then reduced HAuCLi within PPy nanotubes in the presence of different surfactants such as sodium dodecyl sulfate (SDS), cetyltrimethylammonium bromide (CTAB) and Tween-80. Nanowires of silver PAni nanocomposites have been reported via in situ polymerization method [36]. In this method aniline is oxidized by ammonium persulfate (APS) in the presence of dodecylbenzene sulfonic acid (DBSA) and silver nitrate (AgN03). In another approach gold-PAni core-shell... 

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