Smart Hybrid Materials (SHMs)
Khashab Research Group
Innovatively Functionalized Nanomaterials for Biomedical, Sensing and Composites Applications

Publication-18

Improving Pore Exposure in Mesoporous Silica Films for Mechanized Control of the Pores

Klichko, Y.; Khashab, N. M.; Yang, Y.-W.; Angelos, S.; Stoddart, J. F.; Zink, J. I. Improving Pore Exposure in Mesoporous Silica Films for Mechanized Control of the Pores. Microporous Mesoporous Mater. 2010, 132, 435-441
Klichko, Y.; Khashab, N. M.; Yang, Y.-W.; Angelos, S.; Stoddart, J. F.; Zink, J. I.
Silica, porous materials, thin films, stimuli-responsive materials
2010
A novel hierarchically structured material consisting of a mesoporous silica film, prepd. by a vapor-phase infiltration method that is microscopically patterned and using a reactive wet-stamping technique, is reported. The two-dimensional hexagonal mesostructure consists of tubular pores of approx. 2.4 nm in diam. that are aligned in a particular direction. The micropatterns, 1.5 μm wide strips oriented perpendicular to the direction of the nanopores and sepd. from each other by 1.5 μm gaps, were etched in such a manner so as to enable multiple regions of accessibility to the nanopores that would otherwise not be easy to access. The nanopore accessibility and orientation were confirmed by infiltration of the nanopores with a fluorescent polymer, resulting in a polarization of the emission. After the etching process, mech. interlocked mols. that act as gatekeepers were attached to the nanopore openings. Trapping and on-command release of luminescent probe mols. were demonstrated in these micro-patterned mesoporous silica films.