2011
DOI: 10.1021/la104448n
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Profile Control in Surface Amine Gradients Prepared by Controlled-Rate Infusion

Abstract: Surface amine gradients that exhibit a wide variety of profiles, including those that incorporate spatially distinct regions having steep and gradual variations in chemical functionality, have been prepared by the sol-gel process using a controlled-rate infusion method. In this work, a substrate that incorporates dimethyl and Si-OH groups is temporally modified with an aminoalkoxysilane (NH(2)(CH(2))(3)Si(OC(2)H(5))(3)) to build a gradient film for which the amine content changes over a 10-20 mm distance. Both… Show more

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Cited by 27 publications
(145 citation statements)
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“…2A shows the N1s XPS spectra acquired from each powdered sample removed from an aligned multicomponent gradient (P + A). The peak appears at ∼400 eV, corresponding to the binding energy of the free amine [23]. Consistent with the formation of a gradient in amine, the peak increases in intensity from top to bottom.…”
Section: Characterization Of Amine and Phenyl Gradient And Uniformly mentioning
confidence: 52%
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“…2A shows the N1s XPS spectra acquired from each powdered sample removed from an aligned multicomponent gradient (P + A). The peak appears at ∼400 eV, corresponding to the binding energy of the free amine [23]. Consistent with the formation of a gradient in amine, the peak increases in intensity from top to bottom.…”
Section: Characterization Of Amine and Phenyl Gradient And Uniformly mentioning
confidence: 52%
“…A + P uniform TLC plates were fabricated by first soaking the activated TLC plates in amine solution (for less than a minute) followed by the phenyl solution (for 12 min) or in the reverse order for P + A uniform plates. The composition of the APTEOS solution was ethanol: APTEOS: distilled water The multi-component gradients were prepared using controlled rate infusion (CRI) [23]. In this method, the activated TLC plate was placed vertically in a 25 mL graduated cylinder and either the APTEOS or PTMOS solution was infused at a rate of 20.48 mL/min or 1.38 mL/min, respectively, using a syringe pump (New era NE-1000).…”
Section: Fabrication Of Stationary Phasesmentioning
confidence: 99%
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