The use of surfactant headgroups for interfacial imprinting is established as a simple and tunable approach to create molecularly imprinted silica nanoparticles based on a modification of the Stöber method. Adsorption of d-glucose and d-xylose (initial concentrations ranging from 0.139 to 1.67. mol/l) is measured on silica nanoparticles created by the addition of a glucose-based surfactant (n-octyl-β- d-glucopyranoside (C8G1)) or surfactant mixtures (C8G1 and cetyltrimethylammonium bromide (CTAB)) to Stöber particles shortly after their precipitation. Silica particles synthesized in the presence of C8G1 as an imprinting surfactant have a significantly higher affinity for glucose over xylose (as much as 3.25 times greater at 0.25. M saccharide), and an enhanced affinity for glucose relative to non-imprinted silica particles (as much as 4 times greater at 0.25. M), which adsorb glucose and xylose similarly. Glucose imprinting is significantly enhanced using a surfactant mixture of 1:1 C8G1/CTAB. The interfacial activity of the nonionic imprinting surfactant at the silica surface is suggested to be improved by the presence of interfacial cationic CTAB, which is driven to the silica surface through electrostatic interactions. The concept of imprinting through the interaction of surfactant headgroups with the soft surface of silica particles is supported by the importance of the time of addition of the surfactants. The greatest enhancement in glucose adsorption is observed when the surfactants are added 1. min after precursor addition (at the onset of aggregated particle formation, as indicated by solution turbidity) and the silica affinity for glucose decreases with the time of surfactant addition. The versatility of the surfactant imprinting of Stöber particles is demonstrated by the enhanced adsorption of xylose relative to glucose on particles imprinted using a 1:1 mixture of n-octyl-β- d-xylopyranoside and CTAB, suggesting that the process can be customized to selectively adsorb target molecules of interest.
|Number of pages||10|
|Journal||Journal of Colloid and Interface Science|
|State||Published - Aug 15 2014|
Bibliographical noteFunding Information:
We thank Jia Ye for help in training and obtaining images with SEM. We would also like to thank Dr. Paritosh Wattamwar for help in obtaining zeta potential data. Development of the surfactant-based imprinting strategy and particle synthesis procedure was carried out as part of a project supported by the National Science Foundation (CBET-0967381/0967390). Characterization of saccharide adsorption and selectivity was carried out as part of a project supported by the U.S. Department of Agriculture Biomass Research and Development Initiative (Grant Agreement 68-3A75-7-608).
- Molecular imprinting
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry