Immobilisation of Homogeneous Pd Catalysts within a Type I Porous Liquid

2020 ◽  
Vol 73 (12) ◽  
pp. 1296
Author(s):  
Ellen B. Hemming ◽  
Anthony F. Masters ◽  
Thomas Maschmeyer
Keyword(s):  
Heck Reaction ◽  
Palladium Complex ◽  
Liquid System ◽  
Model Reaction ◽  
Type I ◽  
Silica Nanospheres ◽  
Homogeneous Catalysts ◽  
Pd Catalysts ◽  
Hollow Silica ◽  
Hollow Silica Nanospheres

An N-heterocyclic carbene-based palladium complex was successfully immobilised on the inner surfaces of hollow silica nanospheres. The external surfaces of these spheres were functionalised with a corona-canopy to produce a Type I porous liquid. To confirm the successful immobilisation of the catalytic precursor, the porous liquid system was explored using the Heck reaction as a model reaction. This work demonstrated that homogeneous catalysts can be successfully immobilised within porous liquids in principle and that the approach used could be readily adapted for the immobilisation of other systems.

scholarly journals Key Parameters to Tailor Hollow Silica Nanospheres for a Type I Porous Liquid Synthesis: Optimized Structure and Accessibility

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2307
Author(s):  
Justine Ben Ghozi-Bouvrande ◽  
Stéphane Pellet-Rostaing ◽  
Sandrine Dourdain
Keyword(s):  
Surfactant Concentration ◽  
Silica Shell ◽  
Type I ◽  
Silica Nanospheres ◽  
Hollow Nanospheres ◽  
Hollow Silica ◽  
Swelling Agent ◽  
Porous Properties ◽  
Internal Cavities ◽  
Hollow Silica Nanospheres

Based on silica hollow nanospheres grafted with an ionic shell, silica-based type I porous liquids remain poorly exploited, despite their huge versatility. We propose here to explore the main synthesis step of these promising materials with a thorough characterization approach to evaluate their structural and porous properties. Modifying the main synthesis parameter, the mechanism of the spheres’ formation is clarified and shows that the calcination temperature, the surfactant concentration as well as the micelle swelling agent concentration allow tuning not only the size of the nanospheres and internal cavities, but also the silica shell microporosity and, therefore, the accessibility of the internal cavities. This study highlights the key parameters of hollow silica nanospheres, which are at the basis of type I porous liquids synthesis with optimized structural and porous properties.

Functionalized Holmium-Doped Hollow Silica Nanospheres for Combined Sonodynamic and Hypoxia-Activated Therapy

2018 ◽  
Vol 29 (3) ◽  
pp. 1805764 ◽  
Author(s):  
Yanke Wang ◽  
Yan Liu ◽  
Huixia Wu ◽  
Jianping Zhang ◽  
Qiwei Tian ◽  
...  
Keyword(s):  
Silica Nanospheres ◽  
Hollow Silica ◽  
Hollow Silica Nanospheres

Highly efficient and stable CsPbBr3 perovskite quantum dots by encapsulation in dual-shell hollow silica spheres for WLEDs

2020 ◽  
Vol 7 (10) ◽  
pp. 2060-2071 ◽  
Author(s):  
Lei Qiu ◽  
Hang Yang ◽  
Zhigao Dai ◽  
Fengxu Sun ◽  
Jiarui Hao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silica Spheres ◽  
Silica Nanospheres ◽  
Hollow Silica ◽  
Highly Efficient ◽  
Hollow Silica Spheres ◽  
Direct Exposure ◽  
Perovskite Quantum Dots ◽  
Hollow Silica Nanospheres

A highly stable and efficient CsPbBr3@SiO2 composite phosphor is achieved by protecting the CsPbBr3 QDs from direct exposure to the atmosphere by encapsulating CsPbBr3 into dual-shell hollow silica nanospheres.

scholarly journals Fabrication of Hollow Silica Nanospheres with Ultra-High Acid Density for Efficient Heterogeneous Catalysis

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 481 ◽  
Author(s):  
Xiaoli Zhang ◽  
Juan Wei ◽  
Xiaoming Zhang
Keyword(s):  
Sulfonic Acid ◽  
Condensation Reaction ◽  
Solid Acid Catalyst ◽  
Hollow Structure ◽  
Acid Catalyst ◽  
Acid Strength ◽  
Silica Nanospheres ◽  
Hollow Silica ◽  
High Acid ◽  
Hollow Silica Nanospheres

Hollow silica nanospheres with ultra-high acid density were fabricated successfully via sulfonation of phenyl-functionalized hollow silica nanospheres, which were synthesized through a single micelle (F127 (EO106PO70EO106))-templated method, with phenyltrimethoxysilane and tetramethoxysilane (TMOS) as silane precursors under neutral conditions. The density of sulfonic acid reached as high as 1.97 mmol/g. The characterization results of 31P-NMR using triethylphosphine oxide as a probe molecule suggested that the acid strength of hybrid solid acids could be systematically tuned by tuning the content of sulfonic acid and higher acid density results in stronger acid strength. Attributed to the unique hollow structure and high-acid density, the sulfonic acid-functionalized hollow silica nanospheres exhibited good catalytic performance in the condensation reaction of benzaldehyde with ethylene glycol. Notably, this study found that the catalytic activity was significantly influenced by the acid density and the ultra-high acid loading was beneficial for the activity due to the enhanced acid strength. This novel solid-acid catalyst also showed good recyclability and could be reused for at least 11 runs.

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