Synthesis of nanostructured SnO and SnO<sub>2</sub> by high-energy milling of Sn powder with stearic acid

Manzato, Lizandro; Trichês, Daniela Menegon; Souza, Sérgio Michielon de; Oliveira, Marcelo Falção de

doi:10.1557/jmr.2013.220

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…The resulting curve indicates a noncrystalline phase with a maximum at 2 ∼ 15.7 ∘ . Applying the Ehrenfest formula [45], 2 sin = 1.23 , the interatomic distances can be estimated, where is the wavelength of X-rays and is the half angle of diffraction. Thus, a wide distribution of distances with maximum at 6.9Å was noted.…”

Section: X-ray Diffraction and Crystallinity Estimativementioning

confidence: 99%

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Sanches

Alves

Soares

et al. 2015

Journal of Nanomaterials

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Polypyrrole (PPY) powder was chemically synthesized using ferric chloride (FeCl3) and characterized by X-ray diffraction (XRD), Le Bail Method, Fourier Transform Infrared Spectrometry (FTIR), and Scanning Electron Microscopy (SEM). XRD pattern showed a broad scattering of a semicrystalline structure composed of main broad peaks centered at 2θ= 11.4°, 22.1°, and 43.3°. Crystallinity percentage was estimated by the ratio between the sums of the peak areas to the area of amorphous broad halo due to the amorphous phase and showed that PPY has around 20 (1)%. FTIR analysis allowed assigning characteristic absorption bands in the structure of PPY. SEM showed micrometric particles of varying sizes with morphologies similar to cauliflower. Crystal data (monoclinic, space group P 21/c,a=7.1499(2) Å,b=13.9470(2) Å,c=17.3316(2) Å,α=90 Å,β=61.5640(2) Å andγ=90 Å) were obtained using the FullProf package program under the conditions of the method proposed by Le Bail. Molecular relaxation was performed using the density functional theory (DFT) and suggests that tetramer polymer chains are arranged along the “c” direction. Average crystallite size was found in the range of 20 (1) Å. A value of 9.33 × 10−9 S/cm was found for PPY conductivity.

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Section: X-ray Diffraction and Crystallinity Estimativementioning

confidence: 99%

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Sanches

Alves

Soares

et al. 2015

Journal of Nanomaterials

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“…For example, MChT enables to improve photocatalytic properties of oxides through introduction of “intrinsic” defects into their structure (Baláž et al., 2013; Boldyrev, 2002; Buyanov et al., 2009; Lamelas, 2004; Šepelák et al., 2012). But this aspect is insufficiently studied for tin dioxide (Al-Hamdi et al., 2014; Cukrov et al., 2001; Kersen, 2002; Kersen and Sundberg, 2003; Lamelas, 2004; Manzato et al., 2014; Senna et al., 2015; Yang et al., 2004; Ye et al., 2014). The listed works are devoted to study of other physical–chemical properties and applications of tin mono- and dioxide.…”

Section: Introductionmentioning

confidence: 99%

Dyes catalytic degradation using modified tin(IV) oxide and hydroxide powders

Khalameida

Samsonenko

Skubiszewska–Zięba

et al. 2017

Adsorption Science & Technology

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Mechanochemical modification of low-dispersed SnO 2 and high-dispersed SnO(OH) 2 powders with specific surface area 6 and 198 m 2 g À1 have been studied. The crystal, porous, and electronic structure of obtained products, as well as their photocatalytic activity under visible light in the process of dyes degradation has been investigated. It has been established that high-dispersed powder is porous and poorly crystalline. Its specific surface area decreases after milling. On the contrary, low-dispersed powder is almost nonporous and well crystallized. Its specific surface area increases but degree of crystallinity reduces as a result of milling. Milling of both powders in water leads to formation of meso-macroporous structure. The narrowing of band gap and increase of adsorption of visible light occur after modification of low-dispersed sample. As a result, photocatalytic activity of milled powders under visible irradiation significantly increases. Maximal activity showed high-dispersed sample milled in air and water.

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“…Furthermore, a main amorphous halo centered at 2θ ≈ 15.7° can be identified in both pattern samples. Using the Ehrenfest equation (2Rsinθ=1.23λ) (Manzato, Trichês, De Souza, & De Oliveira, 2014) an interatomic distance of R≈ 6.9 Å was calculated for a second neighbor husk. Is important to note that the peak located at 2θ ≈ 34° and both amorphous halos have their intensity increasing when compared with the XRD pattern of in natura sample.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Value aggregation of pine (Araucaria angustifolia) nuts agro-industrial waste by cellulose extraction

Barros

Pessoa

Júnior

et al. 2021

RSD

Self Cite

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Araucaria (Araucaria angustifolia) is a tree species found in the Southeast and South of Brazil. It is also known as Brazilian pine, presenting fruits of high acceptance. However, its processing generates by-products that are little used. Thus, this work aimed to extract and characterize the cellulose obtained from the pinion husk, as well as to evaluate the contents of ash, lignin, cellulose and α-cellulose in its composition. The raw material and the extracted cellulose were characterized by X-ray fluorescence analysis (XRF), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). As for the contents of chemical composition detected, the husks showed 1.6% ash, 7% extractives, 34% lignin and 55% cellulose, being 46% α-cellulose and 9% hemicellulose. It was observed by XRD that the removal of amorphous materials resulted in a gain of crystallinity (from 19 to 33%). Proving the efficiency of the extraction, the characterization of the cellulose obtained was shown to be of high purity, since the main band of the lignin (FTIR) and the amorphous materials of the cellulosic sample (TGA) disappeared. Finally, this work shows that the pinion bark is a rich source of cellulose, making it possible to obtain nanocrystals.

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Synthesis of nanostructured SnO and SnO₂ by high-energy milling of Sn powder with stearic acid

Abstract: Abstract

Cited by 7 publications

References 26 publications

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Dyes catalytic degradation using modified tin(IV) oxide and hydroxide powders

Value aggregation of pine (Araucaria angustifolia) nuts agro-industrial waste by cellulose extraction

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Synthesis of nanostructured SnO and SnO2 by high-energy milling of Sn powder with stearic acid

Abstract: Abstract

Cited by 7 publications

References 26 publications

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Nanostructured Polypyrrole Powder: A Structural and Morphological Characterization

Dyes catalytic degradation using modified tin(IV) oxide and hydroxide powders

Value aggregation of pine (Araucaria angustifolia) nuts agro-industrial waste by cellulose extraction

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Synthesis of nanostructured SnO and SnO₂ by high-energy milling of Sn powder with stearic acid