Preparation of Nanosized Metallic Particles in Polyaniline

Wang, Jinggong; Neoh, K. G.; Kang, En‐Tang

doi:10.1006/jcis.2001.7576

Cited by 122 publications

(84 citation statements)

References 23 publications

(20 reference statements)

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“…However, after the first reaction was completed, the composite showed palladium in both +2 and 0 oxidation states ( Figure S8). 70 This result was similar to that obtained after the fourth run ( Figure 5). These data indicate that once palladium(0) forms on the surface of polyaniline nanofibers, it cannot be brought into solution by reactants.…”

Section: Resultssupporting

confidence: 89%

“…However, X-ray photoelectron spectroscopy (XPS) showed that palladium is in the +2 oxidation state with Pd 3d5/2 at 337 eV and Pd 3d3/2 at 342 eV ( Figure 3). 70 It is possible that a redox reaction occurs to form Pd(0) nanoparticles and since the pernigraniline form of PANI is unstable at room temperature, it is reduced over time causing the palladium nanoparticles to be oxidized. To determine if palladium aggregation occurs over time, the composite was used over several months.…”

Section: Resultsmentioning

confidence: 99%

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A mechanistic study of cross-coupling reactions catalyzed by palladium nanoparticles supported on polyaniline nanofibers

Lemke

Kaner

Diaconescu

2015

Inorg. Chem. Front.

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Palladium nanoparticles supported by polyaniline nanofibers were used as pre-catalysts for C-C cross-coupling reactions of aryl chlorides in water. Using regular techniques, such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) in conjunction with reactivity studies, we determined that a homogeneous mechanism is operating. The appearance of palladium nanoparticles and polyaniline nanofibers changes after each reaction accompanied by changes in the palladium oxidation state. Our methods could not rule out the contribution of a heterogeneous mechanism or indicate its extent.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

A mechanistic study of cross-coupling reactions catalyzed by palladium nanoparticles supported on polyaniline nanofibers

Lemke

Kaner

Diaconescu

2015

Inorg. Chem. Front.

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“…The use of a strong reducing agent, such as NaBH 4 , results in tiny particles that are well dispersed. 29 Nowadays, a succession of chemical reductants can been used for the synthesis of noble metal nanoparticles which contain NaBH 4 35 formaldehyde, 36 formamide, 37 Tollens' reagents, 38 ethylene glycol, 39 ethanol, 40 citrate, 32,40 aniline, 41 polyaniline, 42 or ascorbic acid. 43 Layered silicates, eg, montmorillonite (MMT), have been used in polymer nanocomposites with a significant improvement in mechanical properties.…”

mentioning

confidence: 99%

Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity

Shameli¹,

Ahmad²,

Zargar³

et al. 2011

IJN

138

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Silver nanoparticles (AgNPs) of a small size were successfully synthesized using the wet chemical reduction method into the lamellar space layer of montmorillonite/chitosan (MMT/Cts) as an organomodified mineral solid support in the absence of any heat treatment. AgNO3, MMT, Cts, and NaBH4 were used as the silver precursor, the solid support, the natural polymeric stabilizer, and the chemical reduction agent, respectively. MMT was suspended in aqueous AgNO3/Cts solution. The interlamellar space limits were changed (d-spacing = 1.24–1.54 nm); therefore, AgNPs formed on the interlayer and external surface of MMT/Cts with d-average = 6.28–9.84 nm diameter. Characterizations were done using different methods, ie, ultraviolet-visible spectroscopy, powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray fluorescence spectrometry, and Fourier transform infrared spectroscopy. Silver/montmorillonite/chitosan bionanocomposite (Ag/MMT/Cts BNC) systems were examined. The antibacterial activity of AgNPs in MMT/Cts was investigated against Gram-positive bacteria, ie, Staphylococcus aureus and methicillin-resistant S. aureus and Gram-negative bacteria, ie, Escherichia coli , E. coli O157:H7, and Pseudomonas aeruginosa by the disc diffusion method using Mueller Hinton agar at different sizes of AgNPs. All of the synthesized Ag/MMT/Cts BNCs were found to have high antibacterial activity. These results show that Ag/MMT/Cts BNCs can be useful in different biological research and biomedical applications, including surgical devices and drug delivery vehicles.

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“…These composites have similar characteristics to those made by conventional semiconductors, with significant flexibility and processability [4][5][6][7][8][9][10] . Doping of these oxides into polyaniline is possible by electrochemical deposition, electroless precipitation, solution casting and vacuum deposition techniques [5][6][7][8][9][10][11][12][13][14] . Poly-N-isopropylacrylamide-co-acrylic acid or poly-Nisopropylacrylamide (PNIPAm) is one of the most interesting sensitive polymer microgels which have been extensively studied because its lower critical solution temperature (LCST) is close to room temperature.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Studies of Polyaniline-poly-N-isopropylacrylamide-co-acrylic acid/ Flyash Composites Containing Dodecylbenzene Sulfonic Acid

Shashidhar¹,

Ramprasad²,

Basavaraja³

et al. 2013

Asian J. Chem.

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Polymer composites containing polyaniline-poly-N-isopropylacrylamide-co-acrylic acid (PAA)/flyash (FA) were synthesized by chemical polymerization of aniline in an aqueous solution containing dispersed poly-N-isopropylacrylamide-co-acrylic acid (PNA)/flyash (FA) in the presence of dodecylbenzene sulfonic acid using different wt % of flyash (5, 10, 20 and 30 %). The structure and morphology of the polymer matrix affected by the added were studied by atomic force microscope. The direct current electrical conductivity was studied as a function of flyash content in the temperature range of 293-483 K. The results show an increase in conductivity values as the temperature increases at a particular concentration of flyash. However, further increase in flyash causes a decrease in the conductivity.

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Preparation of Nanosized Metallic Particles in Polyaniline

Cited by 122 publications

References 23 publications

A mechanistic study of cross-coupling reactions catalyzed by palladium nanoparticles supported on polyaniline nanofibers

A mechanistic study of cross-coupling reactions catalyzed by palladium nanoparticles supported on polyaniline nanofibers

Synthesis and characterization of silver/montmorillonite/chitosan bionanocomposites by chemical reduction method and their antibacterial activity

Microscopic Studies of Polyaniline-poly-N-isopropylacrylamide-co-acrylic acid/ Flyash Composites Containing Dodecylbenzene Sulfonic Acid

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