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Dialysis process for the removal of surfactants to form colloidal mesoporous silica nanopartices-S.pdf

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Dialysis process for the removal of surfactants to form colloidal mesoporous silica nanopartices-S

Electronic Supplementary Information Dialysis process for the removal of surfactants to form colloidal mesoporous silica nanoparticles 5 Chihiro Urata, Yuko Aoyama, Akihisa Tonegawa, Yusuke Yamauchi and Kazuyuki Kuroda* Materials Hexadecyltrimethylammonium bromide (C16TMABr), triethanolamine (TEA), Rhodamine 6G (R6G), 10 and acetic acid were purchased from Wako Pure Chemical Industries, Ltd. Tetramethoxysilane (TMOS: Si(OCH3)4) was purchased from Kishida Chemical Ltd. Ethanol was purchased from Junsei Chemical Co., Ltd. Experimental 15 1) Preparation of colloidal mesostructured silica (CMSS) TEA (0.420 g) and 2.00 g of C16TMABr was added to 240 ml of water and the solution was stirred for 30 min at 80 °C. Then 11 mmol of TMOS was added to the C16TMABr solution and stirred vigorously for 2 h at 80 °C. Finally, the colloid was filtered with a filtering paper (No. 5). The molar ratio of the precursor solution was 1 TMOS : 0.50 C16TMABr : 0.25 TEA : 1200 H2O. 20 2) Removal of surfactants from CMSS In the next step, 50 ml of the colloid was transferred into a dialysis membrane tube composed of cellulose (Molecular Weight Cut Off = 12000-14000) and was dialyzed for 24 h against 250 ml of the mixture containing 2M acetic acid and ethanol (1:1, v/v) to remove C16TMABr and this process was repeated three times. Then the tube, which contained colloidal mesoporous silica (CMPS), was 25 immersed in water to remove acetic acid / EtOH in the tube, and the process was repeated three times. CMPS was filtered through a 0.45 μm regenerated cellulose syringe filter. 3) Adsorption of Rhodamine 6G into CMPS A tube containing 10 ml of CMPS was immersed into a R6G solution (40 ml, 50 mg/l) and the solution was stirred to accelerate the transfer of the dye for 12 h at room temperature. Finally, the 30 concentrations of R6G inside and outside the tube were determined by the absorbance at 526 nm. Characterization Dynamic light scattering (DLS) me