Synthesis and thermal study of octahedral silver nano-plates in polyvinyl alcohol (PVA)

Kareem, T. Abdul; Kaliani, A. Anu

doi:10.1016/j.arabjc.2010.06.054

Cited by 50 publications

(14 citation statements)

References 26 publications

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“…An important concern in their use is their stabilization and, thus, the stabilizer used, which includes surfactants and polymers. Poly(vinyl alcohol), for example, is used not only as a stabilizer but also for nucleation, shape-control and enhanced performance [7][8][9][10][11]. The stability of the NP is of concern because instability affects both optical and antibacterial performances [11,12].…”

Section: Introductionmentioning

confidence: 99%

Destabilization of PVA-stabilized Ag NPs: color changes at low aqueous concentrations, induced by aggregation and coalescence

Yang²,

Zhu

et al. 2020

Mater. Res. Express

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Aqueous concentrations of poly(vinyl alcohol) (PVA)-stabilized ∼10 nm silver nanoparticles (Ag NPs), in the 1000 ppm concentration range, have been shown to be highly stable at elevated temperatures. However, lower concentrations of these NPs undergo color changes, without precipitation, when heated or when held for extended periods of time at room temperature. We have studied their optical and morphological changes at 80°C, using UV-vis spectra and TEM, and found that their color, at a concentration of 10 ppm, changes from yellow to claret-red to black without precipitation. Further, the plasmon resonance peak at ∼400 nm diminishes as a new peak develops at ∼550 nm. These changes occur as the previously well-dispersed NPs (yellow color) agglomerate to chains (claret-red color) and, finally, coalesce (black color). We discuss the cause of the instability.

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Section: Introductionmentioning

confidence: 99%

Destabilization of PVA-stabilized Ag NPs: color changes at low aqueous concentrations, induced by aggregation and coalescence

Yang²,

Zhu

et al. 2020

Mater. Res. Express

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“…Eventually, the product was fully broke down at the elevated temperature, which is estimated at ~700°C. The results demonstrate the higher thermal stability of the nanocomposite compared with unfunctionalized PVA (Abdul Kareem and Anu kaliani, 2011 ).…”

Section: Resultsmentioning

confidence: 94%

“…As indicated in Figure 3A, ∼8% loss of weight occurred at the temperatures ranged between ∼300 to ∼700 • C. Separation of copper and removal of hydroxyl groups in the form of water molecules from PVA is propounded in this thermal range. Eventually, the product was fully broke down at the elevated temperature, which is estimated at ∼700 • C. The results demonstrate the higher thermal stability of the nanocomposite compared with unfunctionalized PVA (Abdul Kareem and Anu kaliani, 2011).…”

Section: Energy-dispersive X-ray Spectroscopy (Edx)mentioning

confidence: 89%

Fabrication of Fe3O4@PVA-Cu Nanocomposite and Its Application for Facile and Selective Oxidation of Alcohols

2020

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Fe 3 O 4 @PVA-Cu nanocomposite was introduced as an affordable catalyst for selective oxidation of alcohols into various aldehydes and ketones. The synthesized nanocomposite was characterized by applying essential analyses. The peaks that are appeared in FT-IR spectroscopy confirmed the production of the Fe 3 O 4 @PVA-Cu nanocomposite. In addition, EDX analysis proved the presence of oxygen, carbon, iron, and copper elements in the catalyst. Further, TGA analysis showed high thermal stability of the nanocomposite. VSM technique was applied to examine the magnetic property of the nanocomposite. The results demonstrated a high magnetic property in the catalyst, which enables easy separation of it from the reaction solution. TEM and SEM imaging showed the nanoscale size of the particles (~20 nm) in the catalyst. Additionally, XRD data was compatible with that of Fe 3 O 4 nanoparticles. The application of the nanocomposite has been studied in the selective oxidation of alcohols in the presence of acetonitrile as solvent, and hydrogen peroxide as a supplementary oxidizing agent. This technique is remarkably facile and inexpensive. Further, the products showed high yields. In addition, the calculated TON and TOF values indicated the phenomenal efficiency of the nanocomposite in preparation of targeted products.

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“…In the past decade, much effort has been devoted to the preparation of plate‐like silver powders. A variety of techniques, such as electrochemical techniques [12, 13], polymer‐assisted synthesis [14, 15], polyol routes [16], the solvothermal process [17], the light induction method [18] and the wet chemical process [19], have been proved to be successful for the fabrication of plate‐like silver nanostructures. However, the preparation of silver nanoplates with a well‐controlled morphology and uniform size in high yield by a facile route remains a big challenge.…”

Section: Introductionmentioning

confidence: 99%

Facile route to preparation of plate‐like silver powders

Zou

Sun

et al. 2014

Micro & Nano Letters

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Silver nanoplates with thickness of tens of nanometres and widths in the range of 5-10 μm were successfully prepared employing a facile solution-based route based on the redox reaction between silver ions and ferrous ions. Furthermore, the influences of the mass ratio of reactants, surfactant concentration, reaction temperature and the type of surfactants on the morphologies of silver powders were carefully studied. The phase structure and morphology of silver powders are characterised by X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy. The mass ratio of reactants, concentration of surfactant, reaction temperature and the type of surfactants were crucial factors in determining the morphologies of the final products. The formation mechanism of silver nanoplates is preliminarily discussed.

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Synthesis and thermal study of octahedral silver nano-plates in polyvinyl alcohol (PVA)

Cited by 50 publications

References 26 publications

Destabilization of PVA-stabilized Ag NPs: color changes at low aqueous concentrations, induced by aggregation and coalescence

Destabilization of PVA-stabilized Ag NPs: color changes at low aqueous concentrations, induced by aggregation and coalescence

Fabrication of Fe3O4@PVA-Cu Nanocomposite and Its Application for Facile and Selective Oxidation of Alcohols

Facile route to preparation of plate‐like silver powders

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