Synthesis of Spherical Silica Particles with 3-Mercaptopropyl Groups in Their Surface Layer

Spherical silica particles were synthesized by modified Stöber method using tetraethoxysilane and 3- mercaptopropyltrimethoxysilane (MPTMS). It was shown that their size (500-760 nm) depends on the nature of the catalyst used in the prehydrolysis of MPTMS (at constant alkoxysilanes ratio). Elemental analysis, thermogravimetry and IR spectroscopy data indicate the presence of thiol groups (2.8 mmol/g) in the surface layer. It was established that obtained nanospherical silica particles can adsorb Ag(I) ions from their acidified aqueous solutions.

Download Full-text

Facile Fabrication of Fluorine-Free Superhydrophobic Surfaces with SiO2 Monospheres

Journal of Nanoelectronics and Optoelectronics ◽

10.1166/jno.2021.2934 ◽

2021 ◽

Vol 16 (2) ◽

pp. 208-212

Author(s):

Zhong-Peng Liu ◽

Si-Nan Song ◽

Mu Zhang

Keyword(s):

Contact Angle ◽

Superhydrophobic Surface ◽

Hydrophobic Surface ◽

Silica Particles ◽

Superhydrophobic Surfaces ◽

Particle Sizes ◽

Stöber Method ◽

Spherical Silica ◽

Spherical Silica Particles ◽

Facile Fabrication

Recently, superhydrophobic surface on various type of substrates have attracted much attentions in electronics field. In this work, the classic Stöber method was used to prepare spherical silica particles with different particle sizes by adding different amounts of electrolyte (potassium chloride), giving rise to size distribution ranging from 300 nm to 2.55 yitm. Herein we constructed a micro-nano lotus-like structure in a facile way, achieving a superhydrophobic surface with using any Fluorine related chemicals. In the sense, the silica particles modified with HMDS were sprayed to prepare hydrophobic surface with contact angle up to 152.96° by increasing the frequency of sprays.

Download Full-text

New Polyoxotungstates with Ln(III) and Co(II) and Their Immobilization in Silica Particles

Materials Science Forum ◽

10.4028/www.scientific.net/msf.514-516.1206 ◽

2006 ◽

Vol 514-516 ◽

pp. 1206-1210 ◽

Cited By ~ 2

Author(s):

M.Salete S. Balula ◽

Helena I.S. Nogueira ◽

Ana M.V. Cavaleiro

Keyword(s):

Ir Spectroscopy ◽

General Formula ◽

Silica Particles ◽

Keggin Structure ◽

Hybrid Silica ◽

Silica Material ◽

Spherical Silica ◽

Silica Materials ◽

Spherical Silica Particles ◽

First Time

New lanthanotungstocobaltates with the Keggin structure and general formula KxHy[Ln(CoW11O39)(H2O)3]⋅nH2O or KxHyLn[Ln(CoW11O39)(H2O)3]⋅nH2O, LnIII = Ce, La, Eu, Sm, Tb, were prepared and characterized for the first time. Hybrid silica materials, with the polyoxoanions anchored to spherical silica particles, were also prepared and characterised. Their study by IR spectroscopy and EDS suggested that the structure of the Keggin-type polyanions is maintained when they are immobilized in the silica material.

Download Full-text

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 ◽

10.1039/d1ra01790j ◽

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.

Download Full-text