2013
DOI: 10.1016/j.jcis.2012.09.025
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Preparation, purification, and characterization of aminopropyl-functionalized silica sol

Abstract: A new, simple and "green" method was developed for the surface modification of 20 nm diameter Stöber silica particles with 3-aminopropyl(diethoxy)methylsilane in ethanol. The bulk polycondensation of the reagent was inhibited and the stability of the sol preserved by adding a small amount of glacial acetic acid after appropriate reaction time. Centrifugation, ultrafiltration and dialysis were compared in order to choose a convenient purification technique that allows the separation of unreacted silylating agen… Show more

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Cited by 45 publications
(27 citation statements)
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“…The colloidal stability of the HOBs, which describes the aggregation properties of the beads, was evaluated by zeta potential measurements. We found highly negative zeta potentials (− 56.6 mV for HOB200 and − 58.1 mV for HOB400), which we associated with the dissociation of surface silanol groups . The highly negative zeta potentials suggest that HOBs have excellent colloidal stability in water at pH 7.4.…”
Section: Resultsmentioning
confidence: 70%
“…The colloidal stability of the HOBs, which describes the aggregation properties of the beads, was evaluated by zeta potential measurements. We found highly negative zeta potentials (− 56.6 mV for HOB200 and − 58.1 mV for HOB400), which we associated with the dissociation of surface silanol groups . The highly negative zeta potentials suggest that HOBs have excellent colloidal stability in water at pH 7.4.…”
Section: Resultsmentioning
confidence: 70%
“…ζ-potentials of the SiO 2 particles were negative in a range of pH examined, that is, the ζ-potential did not become positive even at the low pHs, though an absolute value of the ζ-potential was lowered with a decrease in pH. SiO 2 particles show such tendency of ζ-potential for pH [16,17]. Since the ζ-potential approached to zero at pH below 2.0, the obtained SiO 2 particles had an iso-electric point in a range of 1.5-2.…”
Section: Sio2 Nanoparticlesmentioning
confidence: 89%
“…Silica nanoparticles (NPs) were prepared, functionalized with amino-propyl groups and purified according to literature procedures [7]. Tetraphenyl carboxylic acid palladium (II) porphyrin was then loaded onto the particles by adding a stock solution of porphyrin in DMF to the silica NP-NH 2 sol.…”
Section: Methodsmentioning
confidence: 99%