Nanomaterials for X-Ray Nanochemistry

Guo, Ting

doi:10.1007/978-3-319-78004-7_6

Cited by 16 publications

(27 citation statements)

References 84 publications

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“…This behaviour was the same for all curing methods. The change of the behaviour is coherent with the research reported in the literature [29][30][31][32].…”

Section: Mechanical Properties -Compressive Strengthsupporting

confidence: 91%

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The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

et al. 2020

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Efflorescence is one of the limitations of the widespread use of geopolymers. This problem is caused by excess unreacted sodium oxide remaining inside materials. Unreacted sodium oxide creates white efflorescence on the surface of the produced material in the form of sodium carbonate heptahydrate Na2CO3∙ 7H2O. It decreases not only the aesthetic value of the final products, but also the mechanical properties of the material. The aim of this article is to analyse the influence of the curing method on the appearance of efflorescence on geopolymer composites reinforced by short basalt, especially on mechanical properties. Class F fly ash from the ‘Skawina’ coal-fired power plant (located in Skawina, Lesser Poland, Poland) was used as raw material for the geopolymerization process. The article compares two methods of curing: typical laboratory conditions (in the air) and samples submerged in water. Three series of fly ash-based geopolymer were cast: basalt fibres were added as 1% and 2% by weight of fly ash and one control series without any fibres. The investigation was performed using visual analysis, including microstructure investigation, and the testing of mechanical properties (compressive strength at ambient temperature) after 28 days.

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“…This behaviour was the same for all curing methods. The change of the behaviour is coherent with the research reported in the literature [29][30][31][32].…”

Section: Mechanical Properties -Compressive Strengthsupporting

confidence: 91%

“…The compressive strength changes should also depend upon the fibre content. The literature shows that the results for reinforced samples are usually better [29][30][31][32]. However, lower values for compressive strength for the samples with fibres have been previously reported in the literature [29,33].…”

Section: Mechanical Properties -Compressive Strengthmentioning

confidence: 95%

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

et al. 2020

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“…The results shown here can also be used to explain the findings of enhanced alanine radical production in the presence of small AuNPs under X-ray irradiation, [16] which can be considered to be catalysis based and a type of chemical enhancement. [17] Based on this study, three trends are clear: (1) there is enhancement of the overall yield of the two reactions investigated, i. e., the formation of 7-OHCCA or * BMPOÀH; (2) AuNPs do not catalyze all of the reaction phases in these two complex reactions; AuNPs scavenge * OH; (3) AuNPs are catalytically active toward at least one phase or one reaction step in the complex reactions. These complex, multiple-step reactions may be exhibited in different forms, but this work paints a general picture and provides guidance for how to solve these mechanistic problems.…”

Section: Identification Of Individual Reaction Steps In Complex Radicmentioning

confidence: 77%

Identification of Individual Reaction Steps in Complex Radical Reactions Involving Gold Nanoparticles

Lien

Guo

2018

ChemPhysChem

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A triple‐jump model is invoked to help identify individual reaction steps in complex chemical reactions involving radical reactants in the presence of gold nanoparticles. The model consists of three sequential reaction phases: production of radicals, stabilization of radicals, and conversion from radical intermediates to final products. Isolated reaction phases were studied with electron paramagnetic resonance spectroscopy. As examples of the model, we investigated the spin trapping reaction with BMPO and the hydroxylation of 3‐CCA, and the results supported the model. For X‐ray irradiation of gold nanoparticle aqueous solutions, hydroxyl radicals were found to be scavenged by nanoparticles in the first phase. The stabilization phase was largely unaffected by gold nanoparticles, whereas conversion of radical intermediates was catalyzed. Such a step‐wise model is thus proven useful for determining the exact catalytic step in the presence of nanoparticle catalysts in complex reactions such as DNA strand breaks, polymerization and hydroxylation that are important to many fields including X‐ray nanochemistry.

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“…On the contrary, TMOs, specially Co 3 O 4 [11][12][13] and MnO 2 [14,15] are considered rather promising electrode materials for SCs, since both of them are low priced, abundant, environment-friendly materials that are rich in oxidation states for efficient charge transfer, have various morphologies and exceptionally high theoretical specific capacitances (C s ) of 3560 or 1370 F g −1 , respectively. However, regardless the fascinating characteristics typically TMOs suffer from their low actual specific capacitance due to poor conductivity and electrochemical stability, low contacting area with the electrolytes and structural degradation during the charge-discharge process [16,17]. In order to improve the capacitive performance of TMOs nanostructured electrode material with various morphologies that have a high specific surface area and a large surfaceto-volume ratio for more effective contact with electrolyte ions, such as mesoporous MnO 2 nanotubes/nanosheets [18], nanowires [19] or flowerlike, urchin-like and nanorod-like structures [20] or ultra-small Co 3 O 4 nanocubes [21], hollow coral-shaped nanostructures [12] or nanosheets [22] have been created.…”

Section: Introductionmentioning

confidence: 99%

Carbon supported manganese(IV)–cobalt(II/III) oxides nanoparticles for high-performance electrochemical supercapacitors

Jablonskienė¹,

Šimkūnaitė²,

Vaičiūnienė³

et al. 2020

chemija

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The carbon supported manganese(IV)-cobalt (II/III) oxides nanoparticles labelled as MnO 2 -Co 3 O 4 /C nanocomposites have been prepared by a simple one-step microwave-assisted heating method using different precursor materials. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and inductively coupled plasma optical emission spectroscopy (ICP-OES) have been used for the characterization of morphology, structure and composition of the synthesized nanocomposites, whereas the electrochemical performance of the prepared nanocomposites has been evaluated by using cyclic voltammetry (CV).It was determined that the use of different precursor materials for the synthesis of the carbon supported MnO 2 and Co 3 O 4 nanocomposites results in a different morphology of the prepared substances. A high specific capacitance (C s ) of 658.8 F g −1 at a scan rate of 10 mV s −1 in a 1 M Na 2 SO 4 solution has been obtained for the MnO 2 -Co 3 O 4 /C-2 nanocomposite that has a spherical shape of nanoparticles. Moreover, it significantly outperforms the MnO 2 -Co 3 O 4 /C-1 nanocomposite that has a lamellar shape of nanoparticles.

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Nanomaterials for X-Ray Nanochemistry

Cited by 16 publications

References 84 publications

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

The impact of the curing process on the efflorescence and mechanical properties of basalt fibre reinforced fly ash-based geopolymer composites

Identification of Individual Reaction Steps in Complex Radical Reactions Involving Gold Nanoparticles

Carbon supported manganese(IV)–cobalt(II/III) oxides nanoparticles for high-performance electrochemical supercapacitors

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