In Situ Production of Spherical Silica Particles Containing Self-Organized Mesopores

Nano Letters ◽  
2001 ◽  
Vol 1 (5) ◽  
pp. 231-234 ◽  
Author(s):  
Ferry Iskandar ◽  
Mikrajuddin ◽  
Kikuo Okuyama
Keyword(s):  
Silica Particles ◽  
Self Organized ◽  
Spherical Silica ◽  
Spherical Silica Particles ◽  
In Situ Production

Synthesis of TEOS-Based Silica Spherical Particles by Sol-Gel Process

2013 ◽  
Vol 773 ◽  
pp. 606-610
Author(s):  
Jing Li ◽  
Hong Qi Zhang ◽  
Wei Xue
Keyword(s):  
Sol Gel ◽  
Silica Particles ◽  
Electron Cloud ◽  
Polymerization Rate ◽  
Spherical Particles ◽  
Condensation Polymerization ◽  
Spherical Silica ◽  
Sol Gel Process ◽  
Spherical Silica Particles

Spherical silica particles, with mean sizes about 1.2 μm, were prepared through TEOS sol-gel process catalyzed by ammonia. The silica particles have a smooth surface and a small specific surface area, 3.4 m2/g. The sol-gel process was monitored by React IRTMusing an in-situ technique. Based on the measurements, mechanism of TEOS hydrolyzation and succedent condensation polymerization was inferred. With the adding of ammonia, OH-anion attacks Si atomic nucleus directly and makes it showing negative electricity. Therefore the electron cloud shifts to the OR group on the other side. This weakens the Si-O bond and results in the removal of the OR group. Furthermore, silanol, generated from TEOS hydrolyzation, attracts Si-OR or other Si-OH around; thereby resulting rapid dehydration or dealcohol between molecular. So the condensation polymerization rate is elevated, and Si-O-Si bond comes into being. Lastly, cross-linking reaction among Si-O-Si bonds forms the particle.

scholarly journals Design, synthesis, and catalytic performance of modified graphene oxide based on a cobalt complex as a heterogenous catalyst for the preparation of aminonaphthoquinone derivatives

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17108-17115
Author(s):  
Mahnaz Mirheidari ◽  
Javad Safaei-Ghomi
Keyword(s):  
Graphene Oxide ◽  
Cobalt Complex ◽  
Catalytic Performance ◽  
Silica Particles ◽  
Design Synthesis ◽  
Spherical Silica ◽  
Modified Graphene Oxide ◽  
Spherical Silica Particles ◽  
Heterogenous Catalyst ◽  
Modified Graphene

GO@f-SiO2@Co is a heterogenous catalyst composed of spherical silica particles grafted on the surface of graphene oxide with ethylenediamine ligands and coordination with Co(ii). We assessed the activity of the catalyst for the synthesis of aminonaphthoquinones.

Magnetic behavior of superparamagnetic Fe nanocrystals confined inside submicron-sized spherical silica particles

2004 ◽  
Vol 69 (9) ◽  
Author(s):  
P. Tartaj ◽  
T. González-Carreño ◽  
O. Bomatí-Miguel ◽  
C. J. Serna ◽  
P. Bonville
Keyword(s):  
Magnetic Behavior ◽  
Silica Particles ◽  
Spherical Silica ◽  
Spherical Silica Particles

Synthesis of spherical silica particles and their thermal behavior

1987 ◽  
Vol 3 (1) ◽  
pp. 86
Author(s):  
Yasuo Azuma ◽  
Yoshimi Tajima ◽  
Nobuo Ōshima ◽  
Kensuke Suehiro
Keyword(s):  
Thermal Behavior ◽  
Silica Particles ◽  
Spherical Silica ◽  
Spherical Silica Particles

Monodisperse spherical silica particles with controlled-varied diameter of micro- and mesopores

2015 ◽  
Vol 41 (3) ◽  
pp. 316-323 ◽  
Author(s):  
E. Yu. Stovpiaga ◽  
D. A. Kurdyukov ◽  
Yu. A. Kukushkina ◽  
V. V. Sokolov ◽  
M. A. Yagovkina
Keyword(s):  
Silica Particles ◽  
Spherical Silica ◽  
Spherical Silica Particles
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