title: Retention in Porous Layer Pillar Array Planar Separation Platforms.
abstract: This work presents the retention capabilities and surface area enhancement of highly ordered, high-aspect-ratio, open-platform, two-dimensional (2D) pillar arrays when coated with a thin layer of porous silicon oxide (PSO). Photolithographically prepared pillar arrays were coated with 50-250 nm of PSO via plasma-enhanced chemical vapor deposition and then functionalized with either octadecyltrichlorosilane or n-butyldimethylchlorosilane. Theoretical calculations indicate that a 50 nm layer of PSO increases the surface area of a pillar nearly 120-fold. Retention capabilities were tested by observing capillary-action-driven development under various conditions, as well as by running one-dimensional separations on varying thicknesses of PSO. Increasing the thickness of PSO on an array clearly resulted in greater retention of the analyte(s) in question in both experiments. In culmination, a two-dimensional separation of fluorescently derivatized amines was performed to further demonstrate the capabilities of these fabricated platforms.
authors: Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States.
authors: Danielle R
authors: DR
authors: Lincoln
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States.
authors: Nickolay V
authors: NV
authors: Lavrik
authors: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37830, United States.
authors: Ivan I
authors: II
authors: Kravchenko
authors: Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States.
authors: Michael J
authors: MJ
authors: Sepaniak