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SUMMARY:A Fluorescence Correlation Spectroscopy Study On Nano-Confinement O
 f R6G In Porous Silica
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20250508T160000
UID:2026-04-22-22-20-54@natsci.colostate.edu
DTSTAMP:20260422T222054
Description:About the Seminar:\n\nChemical behaviors vary between confined 
 and bulk environments. Understanding facets such as diffusion and adsorpti
 on/desorption within confined environments provides crucial insight into b
 ehaviors that can be found in biological systems such as proteins and cell
  membranes. This kind of chemistry can also be observed in model systems s
 uch as reverse micelles or materials such as nanoporous silica. Silica nan
 oparticles are covered in pores that can be used to model confinement of s
 olutions and their dynamics. With applications including chromatography\, 
 water purification\, and materials design\, research into a confined envir
 onment will prove useful. Fluorescence correlation spectroscopy (FCS) was 
 utilized to observe single rhodamine 6G (R6G) molecule interparticle diffu
 sion through nanoporous silica particles at equilibrium. Autocorrelation f
 itted with a two-component model displayed a fast diffusion component with
  the R6G diffusing through pores with little to no adsorption/desorption. 
 While the slow diffusion component exhibited adsorption/desorption to the 
 pore walls. Surface diffusion was ruled out as a mode of diffusion. Thus\,
  the two-component FCS model suggest that in nanoporous silica\, confineme
 nt and solution conditions primarily influence the rate of the fast minima
 lly hindered pore diffusion\, while the slow adsorption-desorption limited
  pore diffusion of R6G remained largely unaffected. 4:00 pm
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