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Sol–Gel Synthesis and Microstructure Analysis of Amino‐Modified Hybrid Silica Nanoparticles from Aminopropyltriethoxysilane and Tetraethoxysilane
Author(s) -
Chen Song,
Hayakawa Satoshi,
Shirosaki Yuki,
Fujii Eiji,
Kawabata Koji,
Tsuru Kanji,
Osaka Akiyoshi
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2009.03135.x
Subject(s) - apatite , microstructure , simulated body fluid , silanes , nanoparticle , chemical engineering , materials science , particle size , hydrolysis , sol gel , molar ratio , nuclear chemistry , magic angle spinning , mineralogy , chemistry , nanotechnology , catalysis , silane , organic chemistry , composite material , nuclear magnetic resonance spectroscopy , engineering
Agglomerated amino‐modified silica nanoparticles were prepared from a novel Stöber‐like precursor system consisting of aminopropyltriethoxysilane (APTES), tetraethoxysilane (TEOS), ethanol, and water where the molar ratio APTES/TEOS was 0, 0.1, 1.0, and 2.0, and the molar ratio H 2 O/‐SiOC 2 H 5 was about 20 to 60, or great excess amounts of H 2 O were employed. APTES catalyzed the hydrolysis and condensation of both silanes. 29 Si magic angle spinning nuclear magnetic resonance spectra confirmed that the particles consisted of Q n species (Si(OSi) n (OH) 4− n ; n =2, 3, 4) and T n species (NH 2 (CH 2 ) 3 –Si(OSi) n (OH) 3− n ; n =2, 3). The APTES content in the precursor solutions controlled the agglomerating spherical particle size and morphology: 0.1 in the ratio APTES/TEOS led to almost independent spheres of 300–400 nm, while the larger ratios 1 and 2 led to ∼250 and ∼150 nm spheres, respectively, that were largely agglomerated and some were fused to look like peanut‐shells. When soaked in Kokubo's simulated body fluid, those amino‐modified particles deposited apatite. The mechanisms of particle formation and apatite deposition were discussed in terms of an intraparticle hydrated layer.