Abstract
This paper reports a one-pot sol–gel approach for the synthesis of the alkylammonium-functionalized mesoporous silica particles with hollow structures and mesoporous silica films via hydrothermal reaction through the self-assembly of N-trimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMAPS) and tetraethoxysilane (TEOS) as a silica source, dodecyldimethyl(3-sulfopropyl)ammonium hydroxide (DDAPS) and fluorocarbon anion (ammonium perfluorooctanoate (APFO)) as the structure-directing agent. The alkylammonium-functionalized hollow mesoporous silica particles exhibited a different morphology, mesoporosity, and hollow structure with a layered mesostructure in the shell according to the DDAPS/APFO surfactant molar ratios (DDAPS/APFO = 3/1~1/9 or APFO in the range of 10~80 mM), reaction times (6~48 h), and reaction temperatures (45~95 °C). Alkylammonium-functionalized hollow mesoporous silica particles with spherical morphologies were produced from precipitation in the bottom of the reaction bottle after the hydrothermal reaction. At a DDAPS/APFO surfactant ratio of 1/3, reaction temperature of 60 °C, and reaction times of 24 h and 48 h, the alkylammonium-functionalized hollow mesoporous silica spheres displayed a multilayered mesostructure in the shell. The sphere size could be controlled from ca. 76 nm to ca. 350 nm with a shell thickness of ca. 35 nm. In addition, alkylammonium-functionalized mesoporous silica films were produced at the air–water interface, whereas hollow mesoporous silica spheres were produced with precipitation in the bottom of the reaction bottle. The film thickness was controlled from ca. 210 nm to ca. 400 nm.
Highlights
Morphological control and the texture of mesoporous materials are extremely important for their function and utility in many applications [1,2,3]
This paper presents for the first time a one-pot sol–gel approach for the synthesis of the alkylammoniumfunctionalized hollow mesoporous silica materials via a hydrothermal reaction through the self-assembly of Ntrimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMAPS) and TEOS as the silica source, and dodecyldimethyl(3-sulfopropyl)ammonium hydroxide (DDAPS) and fluorocarbon anion (ammonium perfluorooctanoate (APFO)) as the structure-directing agents
Interdigitation of the bilayer composed of DDAPS and APFO micelles is believed to be a key feature leading to the stability of bilayers supported on colloidal particles, where the fluorination of lipids has been reported to induce the formation of interdigitated bilayers [23]
Summary
Morphological control and the texture of mesoporous materials are extremely important for their function and utility in many applications [1,2,3]. The sol–gel/emulsion method is a useful approach for the synthesis of hollow mesoporous silica materials by a one-pot process via the self-assembly of an organic template (surfactant or polymer) as a structure-directing agent and an inorganic precursor as the wall composition in the reactant solution. In this method, organic templates have generally been used with single emergent mater. This paper presents for the first time a one-pot sol–gel approach for the synthesis of the alkylammoniumfunctionalized hollow mesoporous silica materials via a hydrothermal reaction through the self-assembly of Ntrimethoxysilylpropyl-N,N,N-trimethylammonium chloride (TMAPS) and TEOS as the silica source, and dodecyldimethyl(3-sulfopropyl)ammonium hydroxide (DDAPS) and fluorocarbon anion (ammonium perfluorooctanoate (APFO)) as the structure-directing agents. Functionalized mesoporous organosilica films were produced at the air–water interface, while hollow mesoporous silica powders were obtained with precipitation at the bottom of the reaction bottle
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
