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- W2035735441 abstract "Abstract Summary: The surface polarity of dimethylsiloxane‐grafted silica particles (DMS/silica) has been studied as a function of surface coverage by measuring the UV/Vis spectra of coadsorbed solvatochromic probes. Fe(phen) 2 (CN) 2 [ cis ‐dicyano‐bis‐(1,10)‐phenanthroline‐iron( II ), ( 1 )] Michler's ketone [4,4′‐bis( N , N ‐dimethylamino)‐benzophenone, ( 2 )], coumarine 153 ( 3 ) and 3‐(4‐amino‐3‐methylphenyl)‐7‐phenylbenzo[1,2 b :4,5 b ′]difuran‐2,6‐dione ( 4 ) were used as solvatochromic surface polarity indicators. Kamlet–Taft's α (hydrogen bond acidity), β (hydrogen bond basicity), and π * (dipolarity/polarizability) parameters of the DMS/solid acid interfaces were calculated using different LSE relationships of $tilde nu _{max }$ data sets of the probes 1 and 2 or 3 (for α and π *) as well as 1 and 4 (for β ). The values for α decrease significantly with increasing conversion of silanol groups with grafted DMS chains. Then, α asymptotically approachs a constant value when more than about 75% of the residual silanols on the surface are grafted with DMS when measured in 1,2‐dichloroethane slurry. The π * values of DMS/silica solvent interfaces seems unaffected by the degree of surface functionalization. The β values of DMS and grafted DMS/silica are clearly lower than the values for α and π *. Solvatochromic probes used for the study of the surface polarity of dimethylsiloxane‐grafted silica particles. image Solvatochromic probes used for the study of the surface polarity of dimethylsiloxane‐grafted silica particles." @default.
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- W2035735441 date "2005-01-25" @default.
- W2035735441 modified "2023-10-12" @default.
- W2035735441 title "Surface Polarity of Dimethylsiloxane-Grafted Silica Particles" @default.
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- W2035735441 doi "https://doi.org/10.1002/macp.200400399" @default.
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