Acidic/amphiphilic silica nanoparticles: new eco-friendly Pickering interfacial catalysis for biodiesel production

2017 ◽  
Vol 19 (19) ◽  
pp. 4552-4562 ◽  
Author(s):  
Bingyu Yang ◽  
Loïc Leclercq ◽  
Jean-Marc Clacens ◽  
Véronique Nardello-Rataj
Keyword(s):  
Surface Modification ◽  
Silica Nanoparticles ◽  
Biodiesel Production ◽  
Pickering Emulsions ◽  
Interfacial Catalysis

Silica nanoparticles have been designed by surface modification to stabilize solventless catalytic Pickering emulsions for effective biodiesel production.

Glycerol/Dodecanol Double Pickering Emulsions Stabilized by Polystyrene-Grafted Silica Nanoparticles for Interfacial Catalysis

ChemCatChem ◽  
2015 ◽  
Vol 7 (20) ◽  
pp. 3229-3233 ◽  
Author(s):  
Hui Shi ◽  
Zhaoyu Fan ◽  
Virginie Ponsinet ◽  
Remi Sellier ◽  
Honglai Liu ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Pickering Emulsions ◽  
Interfacial Catalysis

scholarly journals In situ interfacial surface modification of hydrophilic silica nanoparticles by two organosilanes leading to stable Pickering emulsions

RSC Advances ◽  
2019 ◽  
Vol 9 (68) ◽  
pp. 39611-39621
Author(s):  
Yafit Itzhaik Alkotzer ◽  
Franziska Grzegorzewski ◽  
Eduard Belausov ◽  
Einat Zelinger ◽  
Guy Mechrez
Keyword(s):  
Surface Modification ◽  
Silica Nanoparticles ◽  
Opposite Polarity ◽  
Pickering Emulsions ◽  
Interfacial Surface ◽  
Oil In Water

Oil-in-water Pickering emulsions are stabilized by in situ functionalization of hydrophilic silica nanoparticles with two organosilane precursors of opposite polarity in a two-step emulsification procedure.

scholarly journals Inside Cover: Glycerol/Dodecanol Double Pickering Emulsions Stabilized by Polystyrene-Grafted Silica Nanoparticles for Interfacial Catalysis (ChemCatChem 20/2015)

ChemCatChem ◽  
2015 ◽  
Vol 7 (20) ◽  
pp. 3189-3189 ◽  
Author(s):  
Hui Shi ◽  
Zhaoyu Fan ◽  
Virginie Ponsinet ◽  
Remi Sellier ◽  
Honglai Liu ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Pickering Emulsions ◽  
Interfacial Catalysis

scholarly journals Lipase Immobilization in Mesoporous Silica Nanoparticles for Biofuel Production

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 629
Author(s):  
Aniello Costantini ◽  
Valeria Califano
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Mechanical Stability ◽  
Mesoporous Silica Nanoparticles ◽  
Physiological Role ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
Hydroxyl Groups ◽  
Lipase Immobilization ◽  
Wide Range

Lipases are ubiquitous enzymes whose physiological role is the hydrolysis of triacylglycerol into fatty acids. They are the most studied and industrially interesting enzymes, thanks to their versatility to promote a plethora of reactions on a wide range of substrates. In fact, depending on the reaction conditions, they can also catalyze synthesis reactions, such as esterification, acidolysis and transesterification. The latter is particularly important for biodiesel production. Biodiesel can be produced from animal fats or vegetable oils and is considered as a biodegradable, non-toxic and renewable energy source. The use of lipases as industrial catalysts is subordinated to their immobilization on insoluble supports, to allow multiple uses and use in continuous processes, but also to stabilize the enzyme, intrinsically prone to denaturation with consequent loss of activity. Among the materials that can be used for lipase immobilization, mesoporous silica nanoparticles represent a good choice due to the combination of thermal and mechanical stability with controlled textural characteristics. Moreover, the presence of abundant surface hydroxyl groups allows for easy chemical surface functionalization. This latter aspect has the main importance since lipases have a high affinity with hydrophobic supports. The objective of this work is to provide an overview of the recent progress of lipase immobilization in mesoporous silica nanoparticles with a focus on biodiesel production.

Surface modification of silica nanoparticles by hexarhenium anionic cluster complexes for pH-sensing and staining of cell nuclei

2021 ◽  
Vol 594 ◽  
pp. 759-769
Author(s):  
Alsu Khazieva ◽  
Kirill Kholin ◽  
Irek Nizameev ◽  
Konstantin Brylev ◽  
Ilya Kashnik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Silica Nanoparticles ◽  
Ph Sensing ◽  
Cell Nuclei ◽  
Cluster Complexes ◽  
Anionic Cluster

scholarly journals In situ Fabrication of Multi-Walled Carbon Nanotubes/Silica Hybrid Colloidosomes by Pickering Emulsion Templating Using Trialkoxysilanes of Opposite Polarity

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1480 ◽  
Author(s):  
Grzegorzewski ◽  
Benhaim ◽  
Alkotzer ◽  
Zelinger ◽  
Yaakov ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Silica Nanoparticles ◽  
Droplet Size ◽  
Opposite Polarity ◽  
Pickering Emulsions ◽  
Volume Percentage ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Emulsion Templating ◽  
Silica Hybrid

A simple and effective way to prepare multi-walled carbon nanotubes (MWNT)//silica hybrid microcapsules (colloidosomes) is presented. These microcapsules have been generated by emulsion templating in a biphasic oil-in-water (o/w) system. Two trialkoxysilanes of complementary polarity, (3-aminopropyl)triethoxysilane (APTES) and dodecyltriethoxysilane (DTES), were used to chemically immobilize the silica nanoparticles at the o/w interface and stabilize the as-generated Pickering emulsions. The effects of varying the o/w ratio and the concentration of the added solids on the type of emulsion formed, the oil droplet size, as well as the emulsion stability have been investigated. The emulsion phase fraction was dependent on the silica content while the droplet size increased with increasing oil volume percentage. A solid shell emerged around the oil droplets from copolymerization between silane monomers. The thickness of the resulting shells was several hundreds of nm. Although MWNTs and silica nanoparticles both were co-assembled at the o/w interface, silica has shown to be the sole stabilizer, with APTES being crucial for the formation of the shell structure. Drop-casting of the emulsion and air-drying led to hierarchical open porous MWNT-silica nanocomposites. These new structures are promising as electrically conductive thin films for variety of applications, such as electro-optics, encapsulation, or chemical sensing.

scholarly journals Biocatalytic Pickering Emulsions Stabilized by Lipase-Immobilized Carbon Nanotubes for Biodiesel Production

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 587 ◽  
Author(s):  
Lihui Wang ◽  
Xinlong Liu ◽  
Yanjun Jiang ◽  
Liya Zhou ◽  
Li Ma ◽  
...  
Keyword(s):  
Reaction Time ◽  
Seed Oil ◽  
High Efficiency ◽  
Polynomial Equation ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Multiwall Carbon Nanotube ◽  
Pickering Emulsions ◽  
Optimum Reaction ◽  
Immobilized Candida Antarctica Lipase

Biodiesel is a promising renewable energy source that can replace fossil fuel, but its production is limited by a lack of high-efficiency catalysts for mass production and popularization. In this study, we developed a biocatalytic Pickering emulsion using multiwall carbon nanotube-immobilized Candida antarctica lipase B (CALB@PE) to produce biodiesel, with J. curcas L. seed oil and methanol as substrates. The morphology of CALB@PE was characterized in detail. A central composite design of the response surface methodology (CCD-RSM) was used to study the effects of the parameters on biodiesel yield, namely the amount of J. curcas L. seed oil (1.5 g), molar ratio of methanol to oil (1:1–7:1), CALB@PE dosage (20–140 mg), temperature (30–50 °C), and reaction time (0–24 h). The experimental responses were fitted with a quadratic polynomial equation, and the optimum reaction conditions were the methanol/oil molar ratio of 4.64:1, CALB@PE dosage of 106.87 mg, and temperature of 34.9 °C, with a reaction time of 11.06 h. A yield of 95.2%, which was basically consistent with the predicted value of 95.53%, was obtained. CALB@PE could be reused up to 10 times without a substantial loss of activity. CALB@PE exhibited better reusability than that of Novozym 435 in the process of biodiesel production.

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