Analysis of mechanisms of composite particles modification in liquid dispersions

Dvorský, Richard; Trojková, Jana; Praus, Petr; Luňáček, Jiří

doi:10.1016/j.materresbull.2013.02.059

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…Moreover, DLS distribution also proves the adsorption of Ag nanoparticles on PSMAA spheres due to that Dh of PSMAA/Ag nanocomposite spheres is greater than the Dh of PSMAA spheres. In addition, the mean sizes of Ag nanoparticles are calculated to be 10.08, 12.62, and 13.2 nm for samples PSMAA/Ag-1, PSMAA/ Ag-2, and PSMAA/Ag-3, respectively, by using the additive modification model in Dvorskýet al 36 (the original values V 10 and σ can be obtained from Figure S2). FESEM Images.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

et al. 2016

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A simple, mild and green route is developed for the preparation of uniform polystyrene-methyl acrylic acid/ silver (PSMAA/Ag) nanocomposite spheres with high catalytic activities. In this approach, monodisperse polystyrene-methyl acrylic acid (PSMAA) spheres are used as polymeric matrixes; silver precursor-[Ag(NH 3 ) 2 ] + ions are then adsorbed onto the surfaces of PSMAA spheres due to the strong electrostatic attraction between carboxyl groups (electronegative) and [Ag(NH 3 ) 2 ] + ions (electropositive). Meanwhile, [Ag(NH 3 ) 2 ] + ions are reduced to Ag nanoparticles and simultaneously protected by PVP on the surface of PSMAA spheres. In this way, the PSMAA/Ag nanocomposite spheres with loading Ag nanoparticles on PSMAA spheres are prepared in aqueous media without any toxic reagents used during the preparation process. Ag nanoparticles uniformly distribute on the surfaces of PSMAA spheres with its size ranging from 8 to 24 nm. Moreover, the coverage degree of Ag nanoparticles on PSMAA spheres increases with the increasing of concentration of silver precursor-[Ag(NH 3 ) 2 ] + ions. In addition, thermal analysis results show that the prepared PSMAA/Ag nanocomposite spheres exhibit improved thermal stabilities and glass translation temperature when compared to the related neat PSMAA spheres. Catalytic studies indicate that the prepared PSMAA/Ag nanocomposite spheres exhibit high catalytic activities and good recyclability for the reduction of 4-nitrophenol, rendering a potential use in the fields of catalytic reduction of 4-nitrophenol to 4-aminophenol.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

et al. 2016

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“…[ 37,60–63 ] Dynamic light scattering observations in Figure S11b, Supporting Information, suggest an additive model for adsorption of WO 3 NP on RONS, which supports the idea that the aforesaid interactions between the WO 3 and RONS surfaces are effective for self‐assembly. [ 59,64 ] Self‐assembly is further supported by multiple SEM images and SEM‐EDX analysis of bulk powders of RONS/WO 3 samples (Figures S8 and S10, Supporting Information). The latter systematically shows that RONS (or restacked RONS) were always found to be surrounded by WO 3 (single NP or aggregates) after calcination.…”

Section: Resultsmentioning

confidence: 77%

Morphology Matters: 0D/2D WO₃ Nanoparticle‐Ruthenium Oxide Nanosheet Composites for Enhanced Photocatalytic Oxygen Evolution Reaction Rates

Vignolo‐González

Gouder

Laha

et al. 2022

Advanced Energy Materials

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In the field of artificial photosynthesis with semiconductor light harvesters, the default cocatalyst morphologies are isotropic, 0D nanoparticles. Herein, the use of highly anisotropic 2D ruthenium oxide nanosheet (RONS) cocatalysts as an approach to enhance photocatalytic oxygen evolution (OER) rates on commercial WO3 nanoparticles (0D light harvester) is presented. At optimal cocatalyst loadings and identical photocatalysis conditions, WO3 impregnated with RONS (RONS/WO3) shows a fivefold increase in normalized photonic efficiency compared to when it is impregnated with conventional ruthenium oxide (rutile) nanoparticles (RONP/WO3). The superior RONS/WO3 performance is attributed to two special properties of the RONS: i) lower electrochemical water oxidation overpotential for RONS featuring highly active edge sites, and ii) decreased parasitic light absorption on RONS. Evidence is presented that OER photocatalytic performance can be doubled with control of RONS edges and it is shown that compared to WO3 impregnated with RONP, the advantageous optical properties and geometry of RONS decrease the fraction of light absorbed by the cocatalyst, thus reducing the parasitic light absorption on the RONS/WO3 composite. Therefore, the results presented in the current study are expected to promote engineering of cocatalyst morphology as a complementary concept to optimize light harvester‐cocatalyst composites for enhanced photocatalytic efficiency.

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“…Thus certain species can migrate within the volatile and refractory classifications, depending on the conditions under which condensation takes place. The ability to understand and predict this type of behavior is crucial not only in the realm of nuclear forensics, but also in the study of particle production processes for industrial applications (Koch et al [2005], Dvorský et al [2013], Bunge et al [2019]). With the example of a numerical calculation, we have also shown that it is possible to combine first principles models with current computational capabilities to describe the development of fractionation characteristics, thus reducing the need for empirical parameterization.…”

Section: Discussionmentioning

confidence: 99%

Chemical fractionation in systems condensing from the gas phase

Moresco

2021

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Analysis of mechanisms of composite particles modification in liquid dispersions

Cited by 10 publications

References 8 publications

Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

Morphology Matters: 0D/2D WO₃ Nanoparticle‐Ruthenium Oxide Nanosheet Composites for Enhanced Photocatalytic Oxygen Evolution Reaction Rates

Chemical fractionation in systems condensing from the gas phase

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Analysis of mechanisms of composite particles modification in liquid dispersions

Cited by 10 publications

References 8 publications

Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

Facile Preparation of Uniform Nanocomposite Spheres with Loading Silver Nanoparticles on Polystyrene-methyl Acrylic Acid Spheres for Catalytic Reduction of 4-Nitrophenol

Morphology Matters: 0D/2D WO3 Nanoparticle‐Ruthenium Oxide Nanosheet Composites for Enhanced Photocatalytic Oxygen Evolution Reaction Rates

Chemical fractionation in systems condensing from the gas phase

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Morphology Matters: 0D/2D WO₃ Nanoparticle‐Ruthenium Oxide Nanosheet Composites for Enhanced Photocatalytic Oxygen Evolution Reaction Rates