Abstract
Periodic mesoporous organosilicas (PMOs) nanospheres with tubular structure were prepared with compressed CO2 using cationic and anionic mixed surfactant (CTAB/SDS) and triblock copolymer Pluronic P123 as bi-templates. TEM, N2 adsorption-desorption, solid NMR, and FTIR were employed to characterize the obtained materials. Compressed CO2 severed as acidic reagent to promote the hydrolysis of organosilicas, and could tune the morphology and structure of the obtained PMOs nanomaterials simple by adjusting the CO2 pressure during the synthesis process. Rhodamine B (RB) and Ibuprofen (IBU), as the model dye and drug, were loaded into the prepared nanomaterials to reveal its adsorption and desorption ability. Furthermore, different molars of the surfactant (CTAB/SDS) and organosilane precursor (BTEB) were investigated to show the effect of the surfactant concentration on the morphology and structure of the PMOs prepared with compressed CO2, and some different structures were obtained. A possible mechanism for the synthesis of PMOs with tubular structure using compressed CO2 was proposed based on the experimental results.
Highlights
1,4-bis(triethoxysilyl)benzene (BTEB) were served as bi-templates and the organosilica precursor in the synthesis of Periodic mesoporous organosilicas (PMOs) respectively
The results proved that the Rhodamine B (RB) molecules have been adsorbed in the pores of the PMOs
PMOs nanospheres with tubular structure were successfully synthesized through a facile and green approach using compressed CO2 to replace acid or any base in the solution. This simple strategy was carried out with a bi-temple surfactant system where the successively grown PMOs nanospheres with tubular structure could be appropriately adjusted by manipulating the pressure of compressed CO2
Summary
PMOs nanospheres with tubular structure were successfully synthesized through a facile and green approach using compressed CO2 to replace acid or any base in the solution. The obtained solid sample was added into 40 mL PBS buffer solution (pH 7.4), agitated in a water shaker at 80 rpm, and the temperature was kept at 28 °C. In a typical synthesis, which is similar to the synthesis of PMOs nanospheres with tubular structure, except the ratio of the surfactants (CTAB/SDS)/P123 and BTEB were different. The amount of BTEB was fixed on 0.2142 g, with the molar ratio of surfactants and BTEB changed from 0.004:1 to 0.017:1 and 0.068:1, and the CO2 pressure is 4.90 MPa
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