Super Hydrophobic Mesoporous Silica with Anchored Methyl Groups on the Surface by a One-Step Synthesis without Surfactant Template
Author(s)
Yang, Dongjiang
Xu, Yao
Wu, Dong
Sun, Yuhan
Zhu, Huaiyong
Deng, Feng
Griffith University Author(s)
Year published
2007
Metadata
Show full item recordAbstract
Mesoporous silicas with methyl groups anchored on the pore wall by covalent bonds were prepared using polymethylhydrosiloxane and tetraethylorthosilicate as silica sources via a one-step synthesis approach. No surfactants were introduced in the synthesis and the pore size can be tuned readily by adjusting the amount of polymethylhydrosiloxane used in the synthesis. Generally, such a hybrid structure is achieved by two steps: synthesizing mesoporous silica substrate using surfactant as template and grafting the pore wall surface with an organic silane. The synthesis in this study is based on a nonsurfactant route and thus is ...
View more >Mesoporous silicas with methyl groups anchored on the pore wall by covalent bonds were prepared using polymethylhydrosiloxane and tetraethylorthosilicate as silica sources via a one-step synthesis approach. No surfactants were introduced in the synthesis and the pore size can be tuned readily by adjusting the amount of polymethylhydrosiloxane used in the synthesis. Generally, such a hybrid structure is achieved by two steps: synthesizing mesoporous silica substrate using surfactant as template and grafting the pore wall surface with an organic silane. The synthesis in this study is based on a nonsurfactant route and thus is distinctly different from other synthesis routes in reaction mechanism. The obtained silicas exhibit superior hydrophobicity: their contact angles with water are all beyond 150ࠢecause the surface is covered by methyl groups. The hydrophobic silicas can be used as efficient adsorbents for cleaning up spills of oil or organic chemicals on the water surface and toxic organic pollutants in water, such as alkylphenols, at very low concentrations.
View less >
View more >Mesoporous silicas with methyl groups anchored on the pore wall by covalent bonds were prepared using polymethylhydrosiloxane and tetraethylorthosilicate as silica sources via a one-step synthesis approach. No surfactants were introduced in the synthesis and the pore size can be tuned readily by adjusting the amount of polymethylhydrosiloxane used in the synthesis. Generally, such a hybrid structure is achieved by two steps: synthesizing mesoporous silica substrate using surfactant as template and grafting the pore wall surface with an organic silane. The synthesis in this study is based on a nonsurfactant route and thus is distinctly different from other synthesis routes in reaction mechanism. The obtained silicas exhibit superior hydrophobicity: their contact angles with water are all beyond 150ࠢecause the surface is covered by methyl groups. The hydrophobic silicas can be used as efficient adsorbents for cleaning up spills of oil or organic chemicals on the water surface and toxic organic pollutants in water, such as alkylphenols, at very low concentrations.
View less >
Journal Title
Journal of Physical Chemistry C
Volume
111
Issue
2
Copyright Statement
Self-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author[s] for more information.
Subject
Macromolecular and Materials Chemistry not elsewhere classified
Chemical Sciences
Engineering
Technology