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Ludox® Silicon colloid

Figures 6 and 7 show the absorption spectra of colloidal CdS and ZnS at various times of illumination. The two colloids were prepared by adding an NaSH solution to solutions of Cd(C10j2 or Zn(C104)2, respectively, colloidal silicon dioxide (commercially available from Dupont Ludox HS30) being present at 6 x 10 M as stabilizer in both cases. The absorption starts in both cases close to the wavelengths that correspond to the photon energies (515 nm or 2.4 eV for CdS 340 nm or 3.7 eV for ZnS) at which the absorptions begin in the macrocrystalline materials. It is seen that illumination causes not only a decrease in the intensity of the absorption spectrum but also a change in the shape of the spectrum. The onset of light absorption is shifted towards... Figures 6 and 7 show the absorption spectra of colloidal CdS and ZnS at various times of illumination. The two colloids were prepared by adding an NaSH solution to solutions of Cd(C10j2 or Zn(C104)2, respectively, colloidal silicon dioxide (commercially available from Dupont Ludox HS30) being present at 6 x 10 M as stabilizer in both cases. The absorption starts in both cases close to the wavelengths that correspond to the photon energies (515 nm or 2.4 eV for CdS 340 nm or 3.7 eV for ZnS) at which the absorptions begin in the macrocrystalline materials. It is seen that illumination causes not only a decrease in the intensity of the absorption spectrum but also a change in the shape of the spectrum. The onset of light absorption is shifted towards...
SYNS ACTICEL AEROSIL AMORPHOUS SILICA DUST AQUAFIL CAB-O-GRIP II CAB-O-SIL CAB-O-SPERSE CATALOID COLLOIDAL SIUCA COLLOIDAL SILICON DIOXIDE DAVISON SG-67 DICALITE DRI-DIE PESTICIDE 67 ENT 25,550 FOSSIL FLOUR FUMFX) SILICA FUMED SILICON DIOXIDE O LUDOX NALCOAG NYACOL NA ACOL 830 NYACOL 1430 SANTOCEL SG-67 SIUCA, AMORPHOUS SILICIC ANHYDRIDE SIUCON DIOXIDE (FCQ SIUKILL VULKASIL... [Pg.1226]

The colloidal particles Ludox and Compol consist of a more condensed silica structure (Table III). As mentioned, CP detects only those nuclei that have dipolar interactions with protons. Because of the condensed structure, a significant number of Q4 silicon nuclei is too far away from protons and is not detected in a CP experiment (contrary to Q4 nuclei in the alcosol... [Pg.108]

CAB-O-SPERSE CATALOID COLLOIDAL SILICA COLLOIDAL SILICON DIOXIDE DICALITE DRI-DIE INSECTICIDE 67 FLO-GARD FOSSIL FLOUR FUMED SILICA FUMED SILICON DIOXIDE HI-SEL LO-VEL LUDOX NALCOAG ... [Pg.251]


See other pages where Ludox® Silicon colloid is mentioned: [Pg.248]    [Pg.137]    [Pg.305]    [Pg.104]    [Pg.551]    [Pg.248]    [Pg.73]    [Pg.75]    [Pg.211]    [Pg.137]   
See also in sourсe #XX -- [ Pg.200 ]

See also in sourсe #XX -- [ Pg.218 ]




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