scholarly journals Linear β-amino alcohol catalyst anchored on functionalized magnetite nanoparticles for enantioselective addition of dialkylzinc to aromatic aldehydes

RSC Advances ◽  
2020 ◽  
Vol 10 (50) ◽  
pp. 29688-29695
Author(s):  
Carla Sappino ◽  
Ludovica Primitivo ◽  
Martina De Angelis ◽  
Francesco Righi ◽  
Federica Di Pietro ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Magnetite Nanoparticles ◽  
Amino Alcohol ◽  
Aromatic Aldehydes ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Silica Core ◽  
Enantioselective Addition ◽  
Core Shell Nanoparticles

The catalytic activity of a linear β-amino alcohol ligand anchored on functionalized magnetite/silica core–shell nanoparticles has been evaluated in the addition of dialkylzinc to aldehydes leading to promising results.

scholarly journals Preparation and Characterization of Magnetite – Silica Core – Shell Nanoparticles

2021 ◽  
Vol 15 ◽  
pp. 1457-1463
Author(s):  
S. N. Vakhneev ◽  
Minggong Sha
Keyword(s):  
Magnetite Nanoparticles ◽  
Biomedical Applications ◽  
Core Shell ◽  
Amino Groups ◽  
Absorption Bands ◽  
Shell Nanoparticles ◽  
Oh Groups ◽  
Silica Core ◽  
Core Shell Nanoparticles

In this study, two types of ligands were introduced onto the surface of magnetite nanoparticles by hydrolysis and condensation of organosilicon reagents: organosilane-tetraethoxysilane (TEOS) and aminoorganosilane - aminopropyltriethoxysilane (APTES). It is shown that coatings based on SiO2 solve a double problem: first, they prevent the aggregation of nanoparticles and the oxidation of magnetite; secondly, they allow the surface to be modified with various specific ligands for biomedical applications due to terminal groups. It was shown, that after the modification of TEOS and APTES (in argon and in air), the Fe3O4 content decreases to 66, 42, and 36%, respectively. The formation of a silicon framework on the magnetite surface due to Fe-O-Si and Si-O-Si bonds was determined by IR spectroscopy. The identification of surface amino groups is complicated due to the superposition of absorption bands of NH2- and OH-groups. This opens new prospective for creation of tailored nanocomposites containing magnetite nanoparticles. These materials can be further used as sorbents for various applications.

scholarly journals The phase diagram of colloidal silica–PNIPAm core–shell nanogels

Soft Matter ◽  
2020 ◽  
Vol 16 (2) ◽  
pp. 466-475 ◽  
Author(s):  
Lara Frenzel ◽  
Felix Lehmkühler ◽  
Michael Koof ◽  
Irina Lokteva ◽  
Gerhard Grübel
Keyword(s):  
Phase Diagram ◽  
Colloidal Silica ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Aqueous Dispersions ◽  
Structure And Dynamics ◽  
Silica Core ◽  
Core Shell Nanoparticles

We study the structure and dynamics of aqueous dispersions of densely packed core–shell nanoparticles composed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell as a function of temperature and concentration.

Synthesis of magnetite–silica core–shell nanoparticles via direct silicon oxidation

2014 ◽  
Vol 432 ◽  
pp. 43-46 ◽  
Author(s):  
Shuxian Wang ◽  
Jing Tang ◽  
Hongfu Zhao ◽  
Jiaqi Wan ◽  
Kezheng Chen
Keyword(s):  
Core Shell ◽  
Silicon Oxidation ◽  
Shell Nanoparticles ◽  
Silica Core ◽  
Core Shell Nanoparticles
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