Aluminum nanoparticle preparation via catalytic decomposition of alane adducts – influence of reaction parameters on nanoparticle size, morphology and reactivity

2020 ◽  
Vol 49 (28) ◽  
pp. 9820-9834
Author(s):  
Thomas Klein ◽  
Guido Kickelbick
Keyword(s):  
Small Particle ◽  
Reaction Times ◽  
Catalytic Decomposition ◽  
Nanoparticle Size ◽  
Particle Sizes ◽  
Reaction Parameters ◽  
Mild Conditions ◽  
Al Nanoparticles ◽  
Nanoparticle Preparation ◽  
Size And Morphology

Al nanoparticles have been prepared via catalytic decomposition. The influence of various reaction parameters on their size and morphology was studied. The reaction was optimized towards short reaction times, small particle sizes, and mild conditions.

Microwave-Assisted Decarbonylation of Biomass-Derived Aldehydes Using Pd-Doped Hydrotalcites

2019 ◽  
Author(s):  
Nan An ◽  
Diana Ainembabazi ◽  
Kavya Samudrala ◽  
Christopher Reid ◽  
Kare Wilson ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Reaction Times ◽  
Inverse Correlation ◽  
Mulliken Charge ◽  
Metal Leaching ◽  
Carbonyl Carbon ◽  
Mild Conditions ◽  
Microwave Assisted ◽  
Biomass Processing ◽  
Alcohol Dehydrogenation

<p>Here we report the synthesis, characterization and activity of tunable Pd-doped hydrotalcites (Pd-HTs) for the decarbonylation of furfural, hydroxymethylfurfural (HMF), aromatic and aliphatic aldehydes under microwave conditions. The decarbonylation activity reported is a notable improvement over prior heterogeneous catalysts for this process. Furfural decarbonylation is optimized in a benign solvent compatible with biomass processing - ethanol, under relatively mild conditions and short reaction times. HMF selectively affords excellent yields of furfuryl alcohol with no humin formation, but longer reaction can also afford furan via tandem alcohol dehydrogenation and decarbonylation. Yields of substituted benzaldehydes are related to calculated Mulliken charge of the carbonyl carbon. The activity and selectivity differences can be traced to loading-dependent differences in Pd speciation on the catalysts. Poisoning studies show inverse correlation between Pd loading and metal leaching: Pd-HTs with lowest Pd loading, which consist of highly dispersed and oxidized Pd species, operate heterogeneously with negligible metal leaching. Recycling experiments are consistent with this trend, offering potential for further optimization to improve robustness.</p>

scholarly journals Rapid hot-injection as a tool for control of magnetic nanoparticle size and morphology

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 20708-20719
Author(s):  
Magdalena Kulpa-Greszta ◽  
Anna Tomaszewska ◽  
Andrzej Dziedzic ◽  
Robert Pązik
Keyword(s):  
Particle Shape ◽  
Magnetic Nanoparticle ◽  
Magnetic Particle ◽  
Nanoparticle Size ◽  
Precise Control ◽  
Hot Injection ◽  
Size And Morphology

Rapid hot-injection can be used for precise control of magnetic particle shape.

scholarly journals Homocoupling of terminal alkynes catalyzed by CuCl under solvent-free conditions

2021 ◽  
pp. 174751982110325
Author(s):  
Yan Xiao ◽  
Jiyu Gao ◽  
Peng Chen ◽  
Guangliang Chen ◽  
Zicheng Li ◽  
...  
Keyword(s):  
Functional Group ◽  
Reaction Times ◽  
Environmentally Friendly ◽  
Solvent Free ◽  
Copper Salt ◽  
Terminal Alkynes ◽  
Mild Conditions ◽  
Solvent Free Conditions ◽  
Environmentally Friendly Process

A series of symmetrical 1,4-disubstituted buta-1,3-diynes is prepared with excellent yields (up to 95%) through homocoupling of terminal alkynes catalyzed by a copper salt under solvent-free conditions. This method provides an environmentally friendly process to prepare 1,3-diynes in short reaction times under mild conditions. Furthermore, the method is suitable for a wide substrate scope and has excellent functional group compatibility. The reaction can also be scaled up to gram level.

Surface Passivation of Bare Aluminum Nanoparticles using Perfluoroalkyl Carboxylic Acids

2003 ◽  
Vol 800 ◽  
Author(s):  
R. Jason Jouet ◽  
Andrea D. Warren ◽  
David M. Rosenberg ◽  
Victor J. Bellitto
Keyword(s):  
Composite Material ◽  
Surface Passivation ◽  
Catalytic Decomposition ◽  
Self Assembled Monolayers ◽  
Aluminum Nanoparticles ◽  
Wet Chemistry ◽  
Al Nanoparticles ◽  
Polar Organic Solvents ◽  
Assembled Monolayers

AbstractSurface passivation of unpassivated Al nanoparticles has been realized using self assembled monolayers (SAMs). Nanoscale Al particles were prepared in solution by catalytic decomposition of H3Al•NMe3 or H3Al•N(Me)Pyr by Ti(OiPr)4 and coated in situ using a perfluoroalkyl carboxylic acid SAM. Because the Al particles are prepared using wet chemistry techniques and coated in solution, they are free of oxygen passivation. This SAM coating passivates the aluminum and seems to prevent the oxidation of the particles in air and renders the composite material, to some extent, soluble in polar organic solvents such as diethyl ether. Characterization data including SEM, TEM, TGA, and ATR-FTIR of prepared materials is presented.

Efficient Synthesis of 3,4-Disubstituted 7-Azaindoles Employing SEM as a Dual Protecting–Activating Group

Synlett ◽  
2019 ◽  
Vol 30 (20) ◽  
pp. 2273-2278 ◽  
Author(s):  
Piroska Gyárfás ◽  
János Gerencsér ◽  
Warren S. Wade ◽  
László Ürögdi ◽  
Zoltán Novák ◽  
...  
Keyword(s):  
Functional Groups ◽  
Efficient Method ◽  
Reaction Times ◽  
Nucleophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Efficient Synthesis ◽  
Mild Conditions

An efficient method for nucleophilic aromatic substitution on 7-azaindoles has been developed. The reaction is facilitated by the unique dual influence of SEM as both protecting and activating group, permitting mild conditions and short reaction times that are compatible with sensitive functional groups. The method is suitable for the synthesis of a broad range of products, most notably ethers.

Study on Synthesis and Characterization of AgCl Microparticle Materials Based on One-Step Solution Phase Route

2012 ◽  
Vol 568 ◽  
pp. 295-298
Author(s):  
Juan Liao ◽  
Kai Zhang ◽  
Wen Zhong Wang ◽  
Yong Gang Wang ◽  
Li Yu
Keyword(s):  
Reaction Times ◽  
Average Diameter ◽  
Solution Phase ◽  
Synthesis And Characterization ◽  
Sem Images ◽  
X Ray ◽  
Potential Applications ◽  
One Step ◽  
Size And Morphology

AgCl microparticle materials, with novel heart-like morphology, were successfully prepared by means of a simple solution phase route, in which a small amount of hydrochloric acid, ethylene and PVP were introduced to the conventional polyol process. The obtained microparticle materials were characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and UV-Vis absorption spectrum. SEM images show that the obtained AgCl microparticle materials have heart-like morphology with an average diameter of 3 um. The influence of different reaction times on size and morphology of the microparticle materials were also investigated. A possible growth mechanism of AgCl microparticle materials has been proposed on the basis of experimental results and analysis. The as-prepared AgCl microparticle materials would find possible potential applications in photocatalytic fields.

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