TY - JOUR
T1 - A facile cooling strategy for the preparation of silica nanoparticles with rough surface utilizing a modified Stöber system
AU - Xu, Jiaqiong
AU - Ren, Dongfang
AU - Chen, Ning
AU - Li, Xiaofeng
AU - Ye, Zixin
AU - Ma, Shiyu
AU - Chen, Qiming
N1 - Publisher Copyright:
© 2021
PY - 2021/9/20
Y1 - 2021/9/20
N2 - The well-known Stöber method has been widely used to synthesize dense silica particles with smooth surface, however, the preparation of silica nanoparticles with rough surface (RS-SiO2 NPs) based on Stöber system via a facile one-pot method has not been achieved. Herein, a modified Stöber system (i.e., a specific ternary tetraethyloxysilane (TEOS)/ethanol (EtOH)-water (H2O) with a precise molar ratio of 1: 45.8: 124) is used to prepare the primary SiO2 NPs with low-condensed silica shell (LCSS) and unreacted TEOS. Subsequently, via a simple one-step cooling treatment, the RS-SiO2 NPs with spherical morphology (177 nm), large specific surface area (85 m2 g−1) and controllable density were successfully prepared. Various experimental conditions, such as pre-reaction time (reaction time of primary SiO2 NPs at room temperature before cooling treatment), cooling temperature (cooling treatment temperature) and ammonia solution concentration were studied. The results show that the migration rate of the unreacted TEOS in the primary SiO2 NPs plays an important role in the formation of RS-SiO2 NPs. This paper also provides us with a new idea to further understand the formation mechanism of SiO2 particles by the Stöber method. The RS-SiO2 NPs loaded with gold nanoparticles can effectively reduce 4-nitrophenol to 4-aminophenol.
AB - The well-known Stöber method has been widely used to synthesize dense silica particles with smooth surface, however, the preparation of silica nanoparticles with rough surface (RS-SiO2 NPs) based on Stöber system via a facile one-pot method has not been achieved. Herein, a modified Stöber system (i.e., a specific ternary tetraethyloxysilane (TEOS)/ethanol (EtOH)-water (H2O) with a precise molar ratio of 1: 45.8: 124) is used to prepare the primary SiO2 NPs with low-condensed silica shell (LCSS) and unreacted TEOS. Subsequently, via a simple one-step cooling treatment, the RS-SiO2 NPs with spherical morphology (177 nm), large specific surface area (85 m2 g−1) and controllable density were successfully prepared. Various experimental conditions, such as pre-reaction time (reaction time of primary SiO2 NPs at room temperature before cooling treatment), cooling temperature (cooling treatment temperature) and ammonia solution concentration were studied. The results show that the migration rate of the unreacted TEOS in the primary SiO2 NPs plays an important role in the formation of RS-SiO2 NPs. This paper also provides us with a new idea to further understand the formation mechanism of SiO2 particles by the Stöber method. The RS-SiO2 NPs loaded with gold nanoparticles can effectively reduce 4-nitrophenol to 4-aminophenol.
KW - Migration rate
KW - Regulating reaction temperatures
KW - Surface-rough SiO NPs
KW - Surfactant-free
KW - Ternary TEOS/EtOH-HO system
UR - https://www.scopus.com/pages/publications/85107677101
U2 - 10.1016/j.colsurfa.2021.126845
DO - 10.1016/j.colsurfa.2021.126845
M3 - 文章
AN - SCOPUS:85107677101
SN - 0927-7757
VL - 625
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 126845
ER -