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640    7.8      5.2  Emission intensity (a.u.)
          Decaline  Water  620                700
              Hexadecane  600  580



        Ethanol PS  IPA PS  IPA  Ethanol  Wavelength (nm)  (b)  690  Wavelength (nm)  (d)
     Air               560
                       540
      Air PS           520                    680

                       500
    70,000  60,000  50,000  40,000  30,000  Intensity (A.U.)  20,000  10,000  0  3  2  Optical density  1 (a) The reflectance spectra showing optical chromatography results collected from the capillary with built-in colloidal crystal which



               595                                     is infiltrated with different types of alkanes (U. Kamp, V. Kitaev, G. von Freymann, G. A. Ozin, and S. A. Mabury, “Colloidal Crystal Capillary Columns- permission). (b) The reflectance spectra from hybrid colloidal crystals composed of silica and PS particles. H
               590                                       Towards Optical Chromatography,” Advanced Materials, 17, (2005), 438–443. Copyright Wiley-VCH Verlag GmbH & Co. KGaA. Reproduced with  prepared in the centrifugal microfluidic chips. Solid and dotted lines represent the reflectance spectra of silica and PS coll
         Nonane  Decane  585  580

     Octane    575      700
               570
       90  85  Reflectivity (arb.u.)  80  650
         Alkanes        600                       (c)


                        550  (a)
       Air
                        500

                        450
    120  100  80  60  40  20  0                                         Reproduced with permission.) (See also color insert.)

                  Reflectivity (arb.u.)



                                                     FIGURE 6-4




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