title: Infrared method for in situ studies of polymer/surfactant adsorption on silica powders from aqueous solution.
abstract: This article presents a general infrared spectroscopic method that enables the monitoring of the adsorption of surfactants and polyelectrolytes on high surface area silica particles from aqueous solution. The method is based on the use of a ZnSe internal reflection element (IRE) coated with a layer of titania particles. The titania surface is the converted to silica using atomic layer deposition with sequential addition of an amine catalyst, gaseous SiCl4, and water vapor. A minimum of three cycles is needed to produce a surface that mimics silica, as evidenced by the reaction of hexamethyldisilazane and zeta potential measurements. It is shown that the silicacoated titania particles on the ZnSe crystals are stable to flowing aqueous solutions below pH = 8 and can be used to study the dynamics of polymer/surfactant adsorption on silica.
authors.affiliation: Laboratory for Surface Science and Technology, Department of Chemistry, University of Maine, Orono, Maine 04469, USA.
authors.forename: Cuihong
authors.initials: C
authors.lastname: Jiang
authors.forename: Haiyan
authors.initials: H
authors.lastname: Li
authors.forename: Carl P
authors.initials: CP
authors.lastname: Tripp
mesh_terms: D000327:Adsorption; D008863:Microspheres; D011108:Polymers / Q000032:analysis* / Q000737:chemistry*; D011208:Powders; D015203:Reproducibility of Results; D018036:Selenium Compounds / Q000737:chemistry; D012680:Sensitivity and Specificity; D012822:Silicon Dioxide / Q000032:analysis* / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013501:Surface-Active Agents / Q000032:analysis* / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry
chemical_list: D011108:Polymers; D011208:Powders; D018036:Selenium Compounds; D013501:Surface-Active Agents; D017967:Zinc Compounds; D014867:Water; D012822:Silicon Dioxide; D014025:Titanium; C044696:zinc selenide